372 results about "Nanofluid" patented technology

The invention discloses an S-shaped micro-channel heat dissipation device with a double-layer turbulent flow structure and a use method, belongs to the field of liquid cooling heat dissipation, and is suitable for heat dissipation of a high-heat-flux device or a heat conduction device. The device comprises a base, a cover plate, a micro-channel body, turbulent flow columns, a flow guide structure, O-shaped sealing rings and quick-screwing connectors, the micro-channel body is provided with S-shaped channels which are vertically symmetrical, the turbulent flow columns are evenly arranged in the centers of the channels, and the top ends of the turbulent flow columns are flush with the end face of the micro-channel body. The turbulent flow columns can be rectangular columns or water-drop-shaped columns which are arranged in a single row or multiple rows at equal intervals and are matched with the flow guide structure to achieve efficient flow division of cold and hot fluid and interlayer heat interaction. Fluid mixing is strengthened through the centrifugal force of the S-shaped channel, a heat boundary layer is destroyed by the turbulent flow columns, and the problems that a traditional straight channel is low in heat exchange efficiency and uneven in temperature distribution are solved. Deionized water or nanofluid is selected as cooling liquid, closed circulation is formed by entering and exiting of the cooling liquid through the quick-screwing connector, and the adaptive scene and the comprehensive performance of the device are further expanded through the multiple rows of turbulent flow columns or the water-drop-shaped turbulent flow columns.

The present invention discloses a visual dynamic control method for a tablet computer based on heat dissipation balance, which relates to the field of heat dissipation visual control technology, including: establishing a three-dimensional heat conduction model of the core components of chips, screens and batteries; constructing a double-layer network architecture; deploying phase change materials at hot nodes, and realizing on-demand heat storage and heat release through electro-induced phase change technology; using a front camera to realize augmented reality technology projection of the thermal field on the surface of the device; constructing a ternary decision tree of energy consumption, performance and heat dissipation, and providing dynamic optimization suggestions in the augmented reality technology interface; integrating a micro piezoelectric pump in the device frame, and driving nanofluids for directional heat transfer through a blood vessel pulsation algorithm; and establishing a thermal management knowledge map containing environmental parameters and usage habits. By quantifying the contribution of each application scenario to each area, the precise allocation of heat dissipation resources is realized, the heat dissipation efficiency is improved, and the augmented reality technology projection of the thermal field on the surface of the device is realized using a front camera.

The invention relates to an enhanced urban terrestrial heat exploitation system and method based on nanofluid. The system comprises a heat collection pipeline, a heat exchange assembly and a nanofluid adjusting assembly. The nanofluid adjusting assembly is connected into the heat collecting pipeline. The nanofluid adjusting assembly comprises a storage pool, a control unit, a concentration detection sensor, a temperature sensor and a concentration adjusting unit, the concentration detection sensor, the temperature sensor and the concentration adjusting unit are connected with the control unit, the storage pool communicates with the heat collecting pipeline, the concentration detection sensor is used for detecting the concentration of nanofluid in the storage pool, and the temperature sensor is used for detecting the temperature of the nanofluid. And the concentration adjusting unit is used for adjusting the concentration of the nanofluid in the storage tank. Compared with the prior art, the method has the advantages that the fluid concentration in the whole circulation pipeline is adjusted in real time according to the appropriate heat transfer concentration of the hybrid nanofluid at all temperatures, then the heat exchange performance of the nanofluid is effectively guaranteed, and the heat exchange efficiency of the geothermal circulation system is improved.

The invention provides an amphiphilic carbon dot, a carbon nanofluid and application of the amphiphilic carbon dot and the carbon nanofluid, and belongs to the technical field of nanomaterial oil displacement, and the amphiphilic carbon dot is prepared by taking alkylphenol polyoxyethylene ether and glucose as raw materials to perform solvothermal reaction; the alkylphenol polyoxyethylene ether comprises octylphenol polyoxyethylene ether and / or nonylphenol polyoxyethylene ether; the mass ratio of the alkylphenol polyoxyethylene ether to the glucose is 1: (0.1-2). According to the invention, alkylphenol polyoxyethylene ether and glucose are taken as raw materials, and simple preparation of the amphiphilic carbon dots with high surface and interface activity is realized. The amphiphilic carbon dots provided by the invention show good surface and interface activity at high temperature and high salinity. According to the carbon nanofluid provided by the invention, the amphiphilic carbon dots and the zwitterionic surfactant are compounded, so that the stability of a carbon nanofluid oil displacement system at high temperature and high salt can be further improved, the crude oil recovery rate is increased, and efficient yield-increasing development of high-temperature and high-salt deep oil reservoirs is realized.

The invention discloses a low-temperature-rise, high-impermeability and low-carbon concrete nano-fluid additive as well as a preparation method and application thereof, and relates to the technical field of graphene materials. The nanofluid additive comprises water and graphene and a dispersing agent which are dispersed in the water, the dispersing agent comprises polyvinyl alcohol and / or sodium carboxymethyl cellulose, and the preparation method comprises the following steps: adding graphite powder into a dispersing agent solution, and then sequentially carrying out shearing stripping and emulsifying stripping to obtain a mixed solution; and centrifuging the mixed solution, and collecting the supernatant to obtain the nanofluid additive. The graphene nanofluid is added into the cement-based material as an additive, can effectively absorb and disperse hydration heat release in the cement hydration process, and slows down the hydration reaction rate, so that the overall hydration heat is reduced. Meanwhile, the high surface area and the two-dimensional structure of the graphene are beneficial to filling micro-pores of the cement-based material, and the impermeability, the durability and the mechanical property of the cement-based material are improved.

The invention relates to the technical field of heat dissipation of electronic devices, in particular to a multi-objective optimization method for a microchannel heat sink turbulent flow structure based on nanofluid. The multi-objective optimization method comprises the steps that integrated computational fluid mechanics simulation, a response surface method and an NSGA-II algorithm are matched; the system solves the problems that in the prior art, research on the synergistic effect of a nanofluid and a turbulent flow structure is insufficient, and multi-objective optimization efficiency is low, firstly, a three-dimensional numerical model is constructed based on ANSYS, and heat transfer and pressure drop characteristics under different parameters are simulated and quantified; secondly, establishing a mathematical model of an input parameter and an output target by adopting a response surface method, and revealing a multi-parameter coupling rule; and finally, performing multi-objective optimization on the synergistic effect by using an NSGA-II algorithm, obtaining a Pareto optimal solution set, and realizing the optimal balance of the heat dissipation performance and the voltage drop. By adopting the technical scheme, through combination of numerical simulation and experimental verification, the optimization efficiency is remarkably improved, and the optimization cost is reduced. And a solution with theoretical preciseness and engineering practicability is provided for thermal management of high-power electronic devices.

The invention discloses a multi-physics coupling viscosity calibration method for a large and heavy hydrostatic pressure rotating table, and belongs to the technical field of fluid mechanics modeling and high-end equipment manufacturing. According to the calibration method, a temperature control / high-pressure rotational rheometer is adopted to obtain experimental data, and experimental verification shows that the average prediction error of the model under the ultrahigh pressure (1000 MPa) and the wide temperature range (20-80 DEG C) is controlled within 10%, and the model is remarkably superior to traditional Arrhenius and Barus models (the error is 40% or above). Theoretical support is provided for oil film dynamic characteristics, bearing capacity optimization and real-time control of a large and heavy hydrostatic pressure system, and the method is suitable for various lubricating media such as mineral oil, synthetic oil and nanofluid and can be widely applied to precision machining and intelligent control in the field of high-end equipment manufacturing.

The embodiment of the invention relates to the technical field of nanofluid preparation, in particular to a nanofluid preparation method which is used for mixing metal nanoparticles and alkali metal to form nanofluid and comprises the steps that S1, the metal nanoparticles are coated with solid alkali metal so as to form an integrated piece with the solid alkali metal; s2, adding the integrated piece into liquid alkali metal; and S3, uniformly mixing the integrated piece with liquid alkali metal to form the nanofluid. According to the embodiment of the invention, the nanoparticles are coated with the solid alkali metal to form the integrated piece, and then the integrated piece is added into the liquid alkali metal, so that the metal nanoparticles can be prevented from being adsorbed on the inner wall of a container or a pipeline, and the situation that the ratio of the metal nanoparticles to the alkali metal is not accurate can be avoided.

The invention relates to the technical field of phase change heat storage, in particular to a simulation method for enhancing a lung groove imitating blood vessel fin phase change heat storage system through nanofluid. The method comprises the following steps: firstly, establishing a three-dimensional physical model of the phase change heat storage enhanced heat transfer system simulating lung groove blood vessel fins, performing simulation analysis on the three-dimensional model, comparing a simulation result with an experimental result, and adjusting parameters of the simulation model to improve the accuracy of the simulation result; different nano-fluids are selected through the optimized simulation analysis platform to carry out enhanced heat transfer research on the TES, and the influence of the volume fraction of the nano-particles, the variety of the nano-particles, the temperature of the heat transfer fluid (HTF) and the initial speed on liquid phase distribution, temperature distribution, melting characteristics and kinetic energy consumption of the TES is analyzed. And finally, performing three-objective optimization on the kinetic energy, the TES heat storage amount and the melting time to obtain an objective function and an optimal value, and providing a certain reference basis for TES multi-objective optimization under the condition that the working medium is the nanofluid.

The invention provides a radiation refrigeration plate combining a sky radiation refrigeration material and a plate heat exchanger, and relates to the technical field of refrigeration, the radiation refrigeration plate comprises a sky radiation refrigeration material layer, a plate heat exchanger assembly, a fan cover layer and a heat insulation material layer, the sky radiation refrigeration material layer has high reflectivity in a solar spectrum wave band and has high emissivity in an atmospheric window wave band, and the plate heat exchanger assembly has high reflectivity in a heat insulation material layer; and heat can be efficiently radiated to the outer space. The plate heat exchanger assembly comprises an enhanced heat exchange tube and a nanofluid, and the nanofluid is filled in the enhanced heat exchange tube and used for heat transfer and transport capacity and enhancing the heat exchange effect. And the fan cover covers the sky radiation refrigeration material. The heat insulation material layer is laid on the portion, except the top face, of the radiation refrigeration plate so as to reduce heat loss of the system to the surrounding environment, and the refrigeration effect is guaranteed. By means of the structure, working modes in the daytime and at night are achieved, the heat transfer efficiency of the system is greatly improved, energy consumption is reduced, and the efficient radiation refrigeration effect of all-weather continuous operation at the temperature lower than the environment temperature is achieved.

The invention provides energy storage battery immersed cooling liquid based on fluorinated nanofluid and a preparation method, and belongs to the technical field of heat management of energy storage equipment, the energy storage battery immersed cooling liquid comprises 74-84% of perfluoropolyether base liquid, 10-15% of surface modified boron nitride nanosheets, 5-8% of microencapsulated perfluorohexanone and 1-3% of polydimethylsiloxane modified silicon dioxide. Microencapsulated perfluorohexanone is integrated into the cooling liquid to achieve the dual functions of heat dissipation and fire extinguishment, and synergistic effects are generated in the aspects of heat conduction, insulation, fire extinguishment and the like through combined use of the perfluoropolyether base liquid, the surface modified boron nitride nanosheets, the microencapsulated perfluorohexanone and polydimethylsiloxane modified silicon dioxide and specific modification performance of the perfluoropolyether base liquid, the surface modified boron nitride nanosheets, the microencapsulated perfluorohexanone and the polydimethylsiloxane modified silicon dioxide. And experimental data can prove that the comprehensive performance of the material has substantive features and remarkable progress in the aspects of heat conductivity coefficient improvement, fire extinguishing time and the like.

The invention belongs to the technical field of flue gas purification, and relates to a method and a device for improving calcium-based dry desulfurization efficiency by nano-fluid dynamic jetting, the method comprises the following steps: delivering flue gas to be treated into a desulfurization reactor through a flue gas pipeline, and jetting a desulfurizing agent into the flue gas pipeline and / or the desulfurization reactor for flue gas desulfurization; and dynamically spraying the nanofluid into a desulfurization reactor and / or a flue gas pipeline so as to be mixed with a desulfurizing agent in the desulfurization reactor and / or the flue gas pipeline to form a desulfurization reaction area. According to the invention, the nanofluid is dynamically jetted into the desulfurization reactor and / or the flue gas pipeline through the control system by utilizing the nano-jet, the nanofluid can enable a desulfurizing agent to expose reaction active sites in time, meanwhile, the nanofluid contains nano-particles for improving desulfurization reaction, and the nanofluid can properly reduce the flue gas temperature, so that the desulfurization effect is improved. A liquid film is formed on the surface of the desulfurizing agent, so that SO2 and the desulfurizing agent quickly react in an ionic state, and the aim of improving the calcium-based dry desulfurization efficiency is fulfilled.

The invention discloses a solar heat utilization optimization method of a heat collector, heat collector equipment and a computer device. The method comprises the following steps: predicting radiation characteristics of suspended nanoparticles based on an artificial neural network model by utilizing a boundary element method; parameters of the heat collector are optimized through a genetic algorithm, and the radiation characteristics of the suspended nanoparticles are evaluated; constructing a heat collector structure optimized by the genetic algorithm in the finite volume method simulation framework, and verifying the rationality of parameters of the heat collector structure; preparing a ternary mixed nano suspension, and verifying the stability of the ternary mixed nano suspension; a heat collector device is prepared based on the ternary mixed nano suspension, a sensor network is arranged in the heat collector device to continuously collect data, the solar heat utilization rate of the heat collector device is determined according to the data, and the data is uploaded to an upper computer to be managed and analyzed. Optimization and performance improvement of the solar heat collector equipment are achieved, and the thermal performance of the heat collector equipment is improved.

The invention belongs to the technical field of efficient heat management, and relates to a nanofluid enhanced heat exchange system based on a built-in ultrasonic device, which comprises an integrated micro-channel cooling plate 2, an embedded ultrasonic device 3, a nanofluid circulating system and an intelligent control system 5, the integrated micro-channel cooling plate 2 is attached to the surface of a heating device 1 (such as a solar cell panel), and the embedded ultrasonic device 3 is attached to the surface of the heating device 1. A groove is formed in the side, away from the heating device 1, of the integrated micro-channel cooling plate 2, the embedded ultrasonic device 3 is installed in the groove, and the nano-fluid circulating system and the embedded ultrasonic device 3 are in electric signal connection with the intelligent control system. The invention can effectively solve the industrial problems of high-temperature efficiency reduction, nanofluid agglomeration instability and the like of the solar cell panel, improve the heat dissipation efficiency and improve the conversion efficiency of the cell panel.

The invention relates to the technical field of fluid heat dissipation, in particular to a heat transfer characteristic analysis method, device and equipment of nanofluid and a medium. According to the method, a velocity calculation formula is constructed based on a power law fluid model, then the velocity calculation formula is applied to the slip length, the fluid attribute information and the pipeline attribute information to obtain the flow velocity of the nanofluid in the miniature pipeline, then the average temperature of the nanofluid in the miniature pipeline is calculated based on the flow velocity, and finally the temperature of the nanofluid in the miniature pipeline is calculated based on the average temperature. And calculating the Nusselt number of the nanofluid in the miniature pipeline. The power law fluid model can describe the non-Newtonian characteristics of the nanofluid, and the non-Newtonian characteristics are suitable for the heat transfer characteristics of the nanofluid in the miniature pipeline, so that the flow velocity, the average temperature and the Nusselt number can describe the heat transfer characteristics of the nanofluid in the miniature pipeline; therefore, the nanofluid can be applied to micro-scale cooling.

The invention relates to the technical field of comprehensive utilization of solar energy, in particular to a photovoltaic heat combined supply self-adaptive heat flow control system and a control method thereof, a photovoltaic-heat-storage-diagnosis integrated module is composed of a photovoltaic layer, a micro-channel heat exchange layer, a heat storage unit, a self-diagnosis unit and an intelligent control unit, based on illumination intensity, assembly temperature, fluid flow, environment humidity and wind speed data, the flow velocity of a cooling medium is dynamically adjusted through an algorithm fusing model predictive control and deep reinforcement learning, and the controller adopts a multi-core heterogeneous processor and supports OTA remote upgrade and standardization module interfaces. Through the collaborative design of the double-sided power generation assembly and the composite nanofluid and in combination with an intelligent heat flow control strategy, the temperature of the photovoltaic assembly is stabilized within the optimal interval of 25-40 DEG C, and the power generation efficiency is improved by 15-30% compared with that of a traditional system; and the heat storage unit adopts a paraffin-based / carbon nanotube composite phase change material, and is matched with a three-stage waste heat recovery system, so that the breakthrough improvement of the comprehensive utilization rate of solar energy is realized.

The invention discloses a hybrid nanofluid, a coating, liquid thermal insulation storage and transportation equipment and a preparation method thereof, belongs to the technical field of nanomaterials and coatings, and solves the problems of insufficient heat dissipation measures and low thermal management efficiency of liquid thermal insulation storage and transportation equipment in the prior art. The preparation method of the hybrid nanofluid comprises the following steps: carrying out functionalization treatment on a multi-walled carbon nanotube by using N-methyl-N-octadecyl sodium taurate to obtain a functionalized multi-walled carbon nanotube; the preparation method comprises the following steps: adding diaminopropyl polyether into a water suspension of aluminum oxide, and sequentially stirring, centrifuging and drying to obtain stable aluminum oxide particles; and adding the functionalized multi-walled carbon nanotubes, the stable aluminum oxide particles and the titanium carbide into the base solution, and uniformly dispersing to obtain the hybrid nanofluid. The hybrid nanofluid provided by the invention is applied to heat preservation of liquid storage and transportation equipment, and has excellent heat-conducting property, weather resistance, long-term stability and corrosion resistance.

The invention relates to the technical field of combustion testing, in particular to a testing device for studying the combustion characteristic of nanofluid fuel. The device comprises an operation table, wherein a convenient combustion adjusting mechanism and a waste gas treatment assembly are mounted on the upper surface of the operation table; the convenient combustion adjusting mechanism comprises a storage tank and a combustion chamber, a pump body is arranged between the storage tank and the combustion chamber, a connecting pipeline is connected between the storage tank and the pump body, a pressure adjusting assembly is arranged between the pump body and the combustion chamber, and an outlet of the combustion chamber is connected with a waste gas treatment assembly; a combustion component and an igniter are arranged on the top of the inner side of the combustion chamber. According to the pressure adjusting assembly, fuel flowing and gas supply can be effectively controlled, the combustion process is stable, accurate test conditions are achieved, the reliability of test results is improved, and fuel performance can be deeply analyzed conveniently.

The invention relates to the technical field of geothermal energy development and utilization, in particular to a horizontal well carbon dioxide fracturing-heat removal-utilization integrated method and device.The method comprises the steps that fracturing fluid in a supercritical state is injected into an injection well to fracture a geothermal reservoir to form cracks; injecting nanofluid formed by mixing fracturing fluid in a supercritical state and heat-conducting nanoparticles into the cracks of the geothermal reservoir through the injection well so as to absorb heat energy of the geothermal reservoir; and the nanofluid absorbing the heat energy of the geothermal reservoir is conveyed into a ground heat removal system through a production well, so that the heat energy generated by expansion of the nanofluid is collected. According to the embodiment of the invention, the geothermal reservoir is fractured by the fracturing fluid in the supercritical state, the permeability of the geothermal reservoir is improved, and geothermal resources can be ensured to flow and be extracted more efficiently. The heat-conducting nano-particles and the fracturing fluid in the supercritical state are combined to form the nano-fluid, so that the heat energy extraction efficiency is greatly improved, and efficient utilization of geothermal resources is achieved.

The invention discloses a high-temperature-resistant composite nanofluid scale inhibitor and a preparation method thereof, and belongs to the technical field of oilfield chemistry. The composite nano fluid scale inhibitor is prepared from modified graphene oxide nano AP-GO, a calcium-based nano modifier calcium-based polysulfonic acid Ca-PAMPS, a surfactant, an inorganic salt and deionized water, the calcium-based nano modifier calcium-based polysulfonic acid contains a large amount of sulfonic acid, carboxylic acid and hydroxyl groups, has strong hydrophilicity, calcium ion tolerance and calcium ion chelating property, and has a good scale inhibition effect on calcium carbonate scale and barium sulfate scale; meanwhile, the modified graphene oxide nanoparticles have large-scale conjugated rings, a large amount of carboxylic acid and hydroxyl groups, and have synergistic interaction with calcium-based polysulfonic acid under the action of anion shielding and large steric hindrance effects, so that the high temperature resistance and scale inhibition performance of the nano scale inhibitor are further improved, a good scale inhibition effect is achieved, and the problems of oilfield water injection and fracturing flowback scaling are effectively solved; good popularization prospects are realized.

The invention relates to the technical field of micro-channel heat exchange, and particularly discloses an efficient micro-channel heat exchange method and application thereof.The efficient micro-channel heat exchange method comprises the steps that an embedded sensor system is used for monitoring the flow speed, temperature, pressure and flow data of fluid in real time, and fluid state information is obtained in real time; the fluid state information is fluid flow velocity, temperature, pressure and flow data acquired based on an embedded sensor; on the basis of real-time fluid state information, the flow velocity, flow direction and temperature of the fluid or the concentration of the nanofluid are adjusted through big data analysis and an artificial intelligence algorithm; the flow velocity, temperature, pressure and other parameters of the fluid are monitored in real time, big data analysis and an artificial intelligence algorithm are combined, the flow state of the fluid is accurately adjusted, the phenomena of uneven flow and stagnation flow are reduced, and therefore the overall heat exchange efficiency is improved. Besides, by optimizing the thermal conductivity, the hydrophilic-hydrophobic property and the surface roughness of the coating on the surface of the micro-channel and applying a nano material, the heat exchange capacity between the fluid and the wall of the micro-channel is enhanced.

The invention discloses a soft coal seam nanofluid fracturing propping material and a preparation method thereof.The soft coal seam nanofluid fracturing propping material is prepared from, by weight, 80-90% of a base material, 1-5% of a super-hydrophobic coating, 5-10% of a catalytic active component and 5-15% of a rheological enhancer, the base material is a compound of high-purity silicon dioxide nanoparticles and graphene nanosheets GNP, the particle size of the high-purity silicon dioxide nanoparticles is 50-200 nm, the super-hydrophobic coating is a fluorosilane modified layer, the thickness of the super-hydrophobic coating is 5-20 nm, and the invention relates to the technical field of coal bed gas exploitation. According to the soft coal seam nanofluid fracturing propping material and the preparation method thereof, the surface of the material is provided with a super-hydrophobic coating, friction force with a coal matrix is reduced, high embedding resistance is achieved, the flow conductivity is specifically enhanced, an extra flow channel is provided through a porous nanostructure, the fracturing fluid permeability is improved, and meanwhile gas desorption can be cooperated; catalytic active sites are introduced to the surface of the material to promote adsorption and diffusion of methane molecules.

Disclosed are a CO2 gas-soluble silicon nanofluid and a preparation method therefor. The method includes: taking nano-silica and grafting a silane coupling agent to obtain modified nano-silica; taking methylsiloxane, fluorosilicone, aminosiloxane and an end-capping agent, and performing polymerization under the action of a catalyst to obtain a functionalized network siloxane; and taking the modified nano-silica and the functionalized network siloxane, uniformly mixing, then heating for a Michael addition reaction, and obtaining the gas-soluble silicon nanofluid after the reaction is completed. The gas-soluble silicon nanofluid microscopically forms a network structure with modified nano-silica as a cross-linking point and polysiloxane as a chain; macroscopically, the effect of viscosity increase of the supercritical carbon dioxide is significant, and the dissolving pressure is low. The interfacial tension and the miscibility pressure between the crude oil and CO2 are significantly reduced.

The invention relates to the technical field of nanofluid enhanced heat transfer simulation, in particular to a molecular dynamics-based mixed nanofluid heat transfer characteristic analysis method, which comprises the following steps of: constructing a molecular model comprising copper, graphene nanoparticles and an ionic liquid / water mixed base solution, and calculating the heat transfer characteristic of the mixed nanofluid through a distribution potential function and a periodic boundary condition; and performing energy minimization and molecular dynamic relaxation to achieve thermodynamic equilibrium. A steady-state temperature gradient is established based on the unbalanced molecular dynamics principle, and the thermal conductivity is calculated according to the Fourier law. Microcosmic parameters such as a radial distribution function, mean square displacement and the number of hydrogen bonds are synchronously analyzed, and a coupling mechanism of interaction and heat transfer performance of the nano-particle-base fluid interface is disclosed. According to the method, the heat transfer characteristic of the mixed nanofluid can be clarified on the molecular scale, and an efficient and reliable analysis means is provided for nanofluid screening and design in application of a solar heat collector, a heat management system and the like.

The invention discloses a C60 nanofluid minimal quantity lubrication turning method for a difficult-to-machine material, and belongs to a machining method. The cutter is especially suitable for cutting machining of difficult-to-machine materials. The nanofluid is prepared from fullerene C60 carbon nanospheres, trace lubricating oil based on plant components and a high-efficiency dispersing agent through accurate proportioning and a specific preparation process. The fullerene C60 carbon nanospheres can form a stable dispersion system in the cutting fluid due to the unique molecular structure and physicochemical properties, and exert excellent lubrication and antifriction effects in the cutting process. The trace lubricating oil has good biodegradability and environmental friendliness, and also has good lubricating performance and cooling performance. The dispersing agent ensures that the carbon nanospheres are uniformly dispersed in the cutting fluid, and agglomeration and precipitation are avoided. The nanofluid can remarkably improve the lubricating effect and cooling performance of cutting machining, reduce the cutting force and cutting heat, prolong the service life of a cutter and improve the machining quality and efficiency.

The invention provides a method for determining a nanofluid oil displacement effect of a low-permeability reservoir, and relates to the technical field of oil exploitation. The method comprises the following steps: providing a core of a low-permeability reservoir, and measuring the particle size of nanoparticles in a target nanofluid; performing high-pressure mercury injection test and nuclear magnetic resonance measurement on the rock core to respectively obtain a rock core pore throat radius-distribution frequency relation curve and a first T2 image, and performing benchmarking on the two images to obtain a pore throat radius-relaxation time relation curve; carrying out displacement experiments (oil displacement, first water displacement, nanofluid displacement and second water displacement) on the rock core, and carrying out nuclear magnetic resonance measurement to obtain T2 images; and observing or calculating the area enclosed by the curve and the relaxation time in each image, and combining with a pore throat radius-relaxation time relation curve to obtain the oil displacement effect of the nanofluid on different pores of the oil reservoir. The oil displacement effect of the nanometer system is determined according to the characteristic parameters of the reservoir core before and after the nanometer fluid is injected, and the method has important guiding significance for formulating a scheme for improving the recovery effect of the low-permeability oil reservoir.

The invention discloses a photovoltaic photo-thermal hydrogen production and energy storage system based on nanofluid and a phase change material, and relates to the technical field of photovoltaic photo-thermal hydrogen production and energy storage, the system comprises a photovoltaic photo-thermal assembly, a water tank, a solar heat collector and a PEM electrolytic bath; the photovoltaic photo-thermal assembly comprises a photovoltaic cell, a first thermoelectric generator, a nanofluid channel and a composite phase change material which are arranged from top to bottom. The solar heat collector comprises a second thermoelectric generator, a water fluid channel and a composite phase change material which are arranged from top to bottom; mixed nanofluid in the nanofluid channel enters a heat exchange coil in the water tank for heat exchange; water in the water tank firstly enters a water fluid channel of the solar heat collector to be preheated and then enters the PEM electrolytic bath; the mixed nanofluid is composed of BN, MWCNT nanoparticles and pure water; the composite phase change material is composed of BN, MWCNT nanoparticles and paraffin. Efficient output of heat energy, electric energy and hydrogen energy can be achieved.

The invention discloses an oil-displacing agent based on zirconium oxide nanosheets and a preparation method of the oil-displacing agent. The oil displacement agent comprises the following components in parts by mass: 0.2-1 part of zirconium oxide nanosheets, 10-30 parts of a surfactant and 5000-10000 parts of water, the size range of the zirconium oxide nanosheet is 200 to 300 nm. The two-dimensional zirconium oxide nanosheet is prepared by utilizing a green substitute solvent-ionic liquid assisted alcohol solvothermal method, the synthesis method is simple, convenient, effective and green, and the size of the product is controllable. The zirconium oxide material has the characteristic of changing rock wettability, and can be used as a metal oxide nano material to improve the viscosity of the prepared nanofluid, reduce the fluidity ratio, generate structural separation pressure on the interface of crude oil and reservoir rock and realize efficient stripping of retained crude oil, thereby greatly improving the recovery efficiency.

The invention discloses a nanofluid mixed matrix membrane as well as a preparation method and application thereof, and belongs to the field of gas separation. The nanofluid mixed matrix membrane comprises a polymer matrix and a nanofluid filler, the nanofluid filler is of a three-dimensional layered structure, a core layer is a porous material layer, a secondary outer layer is a coupling agent connecting layer, and an outermost layer is an organic matter coronal layer containing a CO2-philic group. The coronal layer improves the compatibility of the porous material and the polymer matrix and increases the CO2 affinity of the mixed matrix membrane, not only increases the diffusivity of the mixed matrix membrane, but also increases the CO2 solubility, and due to the unique connection mode between the porous core and the coronal layer, the thermal stability of the porous core and the coronal layer is also enhanced. Therefore, the prepared novel efficient mixed matrix membrane has good gas separation performance and thermal stability and is especially suitable for CO2 separation, and CO2 / H2 of the product breaks through the Robeson upper limit in 2008.

The present invention provides functionalized molybdenum disulfide nanosheets and a preparation method and application thereof. The preparation method comprises the following steps: mixing a solvent, 1 part by weight of thioctic acid, and 5 to 10 parts by weight of a first compound for 2 to 4 hours to obtain a mixture; adding 0.05 to 0.1 parts by weight of 1-hydroxybenzotriazole to the mixture, mixing for 24 to 48 hours, and drying to obtain an intermediate product; and ultrasonically treating or heat-treating the raw material-solution system to obtain the functionalized nanosheets, wherein the raw material-solution system comprises 5 to 10 parts by weight of molybdenum disulfide nanosheets, 1 part by weight of the intermediate product, and brine; and the first compound comprises an oxirane group and an alkylamine chain, wherein the alkylamine chain has 12 to 18 carbon atoms and the oxirane group has 2 to 15 carbon atoms. A nanofluid prepared from the functionalized molybdenum disulfide nanosheets can reduce oil / water interfacial tension, has good stability, significantly improves the recovery rate of low-permeability oil reservoirs, and reduces costs.