214 results about "Nanofluidics" patented technology

The invention relates to the technical field of silicon waveguide and optical fiber coupling, and particularly provides an AI-based silicon waveguide-optical fiber mode field self-alignment coupling method and system, and the method comprises the steps: monitoring the strain distribution of a chip in real time through an integrated distributed fiber bragg grating array, and obtaining the light field intensity distribution of a coupling region through cooperation with a near-field optical probe array; constructing a deep space-time convolutional network, and generating a deformation compensation vector and a waveguide reconstruction parameter by an output layer; a nanofluid channel is integrated on the side wall of the waveguide, and the refractive index of liquid is adjusted through an electrowetting effect to realize dynamic broadening of a mode field; and the electrostatic driving micro-beam embedded below the waveguide adjusts the spatial pose of the waveguide according to an instruction of an output layer of the depth space-time convolutional network. The system comprises a light field intensity acquisition module, a convolutional network construction module and a spatial pose adjustment module. According to the method, real-time analysis and prediction are performed, so that system parameters are actively adjusted, and alignment precision and stability are improved.

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 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 relates to an oil field auxiliary agent, and particularly discloses a temperature-resistant salt-resistant nano fluid oil displacement agent and preparation and application thereof, the temperature-resistant salt-resistant nano fluid oil displacement agent comprises the following components by weight: 5-12 parts of modified nano SiO2 particles, 10-20 parts of a nonionic surfactant, 10-30 parts of a gemini benzoxazine surfactant, 1-5 parts of a dispersant, 10-20 parts of a mutual solvent, and 20-50 parts of water; wherein the modified nano SiO2 particles are obtained by modifying nano SiO2 particles through a macromolecular coupling agent. The nano-fluid oil-displacing agent has the beneficial effects that the recovery efficiency can be improved when the nano-fluid oil-displacing agent is used for exploiting a high-temperature and high-salt oil reservoir, and the nano-fluid oil-displacing agent is good in temperature resistance and salt resistance, small in particle size and capable of remarkably reducing the oil-water interfacial tension.

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 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 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 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.

The invention relates to the technical field of micro-nano electronic devices, in particular to a nanofluid memristor prepared by puncturing a PDMS film and a mechanical-electric coupling regulation and control system and method of the nanofluid memristor. The memristor is composed of a silicon substrate with a window and a PDMS thin film covering the silicon substrate, a three-degree-of-freedom probe station is used for driving a tungsten probe to conduct nanoscale puncture on the PDMS thin film under an optical microscope, and a pore channel with the self-constriction / reversible closing characteristic is formed; after the needle is removed, the hole channel is in a near-closed or sub-nanometer equivalent hole diameter state, by applying controllable pressure to the closed liquid chamber and superposing bias voltage, sudden change / gradual change dual-mode regulation and control of the hole diameter and non-volatile hysteresis conductance switching are achieved, and the switch ratio of the device can reach 108. According to the method, FIB is not needed in hole forming, the process is simple and convenient, the cost is low, high-contrast and programmable nanofluid memristive behaviors are achieved through the structural design of the window orientation and the clamping direction, pressure rate programming and a pressure removal maintaining / negative pressure reset strategy, and the method is suitable for the fields of single molecule detection, ion circuit storage and the like.

Provided are a wafer cleaning method capable of uniformly cleaning an entire area of a wafer, and a wafer cleaning apparatus to which the method is applied. The method includes positioning a cleaning tool to face a surface of the wafer requiring cleaning; supplying a cleaning liquid containing ions to an area between the wafer and the cleaning tool; adjusting a spacing between a surface of the wafer and the cleaning tool for a viscosity of the cleaning liquid therebetween to be controlled by an electric field; and relatively rotating the wafer from the cleaning tool while the electric field being applied to at least a portion of the cleaning liquid, thereby cleaning the surface of the wafer with the cleaning liquid.

This application discloses a nanofluid, its preparation method, and its applications. The nanofluid comprises, by mass fraction: 0.01% to 0.7% modified nanoparticles, 1% to 4% surfactant, 0.2% to 0.6% polymer, and 0.01% to 0.2% short-chain alkanes, with the balance being water. The nanofluid provided in this application, through the synergistic effect between specific components, can significantly improve C / W foam stability and enhance oil recovery. Foam displacement agents prepared using this nanofluid can improve permeability and asphaltene content after displacement, exhibiting good overall performance.

The invention provides a transparent restraint layer suitable for laser shock and a laser shock forming method and device of a metal plate, belongs to the technical field of metal plate laser processing, and aims to solve the technical problem of failure of the restraint layer in a low-temperature environment. The forming method comprises the steps that an absorption layer and a transparent restraint layer are sequentially laid on the surface of a to-be-impacted workpiece, and the transparent restraint layer sequentially comprises a polyurea-polyurethane elastomer layer, a nanofluid layer and a hydrogel layer in the direction close to the to-be-impacted workpiece to the direction away from the to-be-impacted workpiece; a single-laser-head or multi-laser-head array is adopted to implement pulse impact, and a temperature-stress-displacement multi-physical-field closed loop is constructed through displacement sensing, temperature sensing and ultrasonic stress sensing; and the industrial controller operates a model prediction control algorithm to perform linkage optimization on the laser energy density E, the scanning speed v and the hydrogel layer volume flow q. Compared with an existing double-layer constraint and double-feedback scheme, the method has remarkable technical progress in the aspects of low-temperature stability, array consistency and forming consistency.

A kind of solid-liquid two-phase nanofluid cooling fluid optimization method for machine tool spindle dynamic cooling, first carry out the sensitivity / correlation analysis of parameter variable, find out the nanofluid parameter that is strongly related to convective heat transfer characteristics;Then describe the percolation structure of nanoparticle aggregation, based on thermal conductivity model and effective viscosity model into finite element simulation;Then analyze and determine the key parameters of nanofluid in spindle cooling, qualitative selection of the optimization combination of key parameters;According to the "two-step method", nanofluid is prepared, and convective heat transfer experiment is carried out for nanofluid, and the experimental results of nanofluid are compared transversely, and the nanofluid with maximum average convective heat transfer coefficient is selected quantitatively;The present application greatly improves the convective heat transfer rate of the cooling fluid in the machine tool spindle, makes the precision machine tool spindle thermal error in high-speed machining long-term stable, and then eliminates the influence of spindle thermal error on machining precision of machine tool through tool.

The invention discloses a design method of a magnetic field driven nano-magnetofluid directional transportation micro-groove texture and the micro-groove texture, and directional transportation is realized by designing a conical micro-groove texture and matching with an external magnetic field driven nano-magnetofluid. And recording the contact point of the nanofluid and the micro-groove texture and the time from the middle end point of the nanofluid to the small end of the channel, designing a calculation method for measuring the overall speed of the liquid drop, optimizing the micro-texture taper angle by taking the fastest overall speed of the liquid drop as a target, and calculating the non-dimensional energy of the liquid drop to obtain the micro-groove texture. The microtexture small end diameter is optimized with the maximum dimensionless energy difference as the target; and calculating the magnetic field force borne by the liquid drop, and optimizing the magnetic flux density by taking the maximum magnetic field force as a target. According to the design method, the optimal micro-texture structure can be optimized, and the fastest rate transportation of liquid is realized.

The application discloses a preparation method of a high-stability cellulose nanofluid film, and a product and application thereof, and belongs to the field of energy conversion and material science. The method comprises the following steps: adding modified cellulose into an ionic liquid to prepare a solution by heating; dropping and coating the solution onto the surface of a porous polymer film, and preparing a gel film by heating and vacuum treatment; and obtaining the nanofluid film after water soaking and drying of the gel film. The nanofluid film adopts an embedded structure, the cellulose layer is a small-pore structure, the porous polymer film is a large-pore structure, and the nanofluid film has etching and three-dimensional network channel structures. The preparation process is simple and the conditions are mild, the prepared film has excellent ion rapid selective transmission performance, acid-base stability and long-term operation stability, can efficiently convert salinity gradient energy into electric energy, and has a good application prospect in the field of salt-difference osmotic energy utilization.

The invention provides a nanofluid gradient film, a preparation method thereof and application of the nanofluid gradient film in preparation of a pressure sensor. According to the gradient film, the interlayer spacing, the charge density and the wettability of MXene are adjusted by cooperatively inserting different amounts of one-dimensional carboxylated cellulose nanofibers. A nano channel of the gradient membrane is divided into a weak confinement region, a medium confinement region and a strong confinement region, and a rapid permeation-charge shielding-confinement enhanced efficient ion transmission path is constructed. Compared with a single uniform channel, the triple gradient nano channel shows high and different force-electricity response signals to different metal cations. According to the pressure sensor constructed based on the nanofluid gradient film, the sensing performance is remarkably improved in a NaCl solution, the sensitivity of the pressure sensor is 37.28 nA cm <-2 > kPa <-1 >, the cycle stability reaches 50000 times, the response time is 119 ms, and the pressure sensor exceeds the level of currently reported similar sensors.

This invention discloses a ternary composite oil displacement system based on the synergistic effect of nanofluids and polymers, belonging to the field of petroleum extraction technology. It includes a pretreatment unit, a nanofluid supply unit, a temperature- and salt-resistant polymer supply unit, a composite mixing unit, an online synergistic injection unit, and a formation synergistic displacement unit. The outlet of the pretreatment unit is connected to the composite mixing unit, and the nanofluid supply unit and the temperature- and salt-resistant polymer supply unit are connected in parallel to the composite mixing unit. Through the synergistic effect of nanofluids and temperature- and salt-resistant polymers, multiple synergistic effects of "dispersion stabilization, viscosity enhancement, seepage control, and residual oil stripping" are achieved. The modified nanoparticles and temperature- and salt-resistant polymer molecules form hydrogen bonds and electrostatic adsorption complexes, which not only significantly improve the solubility and viscosity stability of the polymer in high-temperature, high-salinity formation water environments but also prevent polymer molecular chain degradation.

The invention belongs to the technical field of carbon dioxide capture and regeneration, and particularly relates to a magnetic nanofluid pseudo-homogeneous-microwave synergistic carbon dioxide desorption method. The invention provides an application of a nickel ferrite material as a catalyst in carbon dioxide absorption pregnant solution regeneration. According to the invention, the carrier-free and undoped spinel-type structure NixFe3-xO4 is used as a catalyst for carbon dioxide absorption rich liquid regeneration, and the catalyst has microwave absorption, catalytic activity and magnetic responsiveness. According to the desorption method provided by the invention, the nickel ferrite material forms a stable quasi-homogeneous dispersion system in the carbon dioxide absorption rich solution, and then under the conditions of low-temperature microwave radiation and stirring, the CO2 desorption load rate reaches more than or equal to 55% within 10-30 min, the desorption reaction rate is increased by more than or equal to 20% compared with that of traditional thermal regeneration, and the desorption time is reduced by more than half compared with that of traditional thermal regeneration.

The application discloses a kind of determination device and method of heat conducting oil-based magnetic nanofluid coking speed, it is related to with heat conducting oil as heat transfer medium in the technical field of medium-temperature solar thermal power generation system, oilfield ground gathering and transportation heating system etc., the method comprises: after heating heat conducting oil tank inside heat conducting oil-based nanofluid by electric heater, it is transported to steel pipe by heat conducting oil pump, the strength of magnetic field is adjusted by adjusting the number of magnetic block and the distance between adjacent magnetic blocks, different intensity magnetic field is applied to the fluid received in steel pipe;The coking product on the first hanger sheet in heat conducting oil tank and the second hanger sheet in steel pipe after applying for a period of time is dried respectively, the mass of coking product in two states before and after applying magnetic field is obtained, so as to calculate the coking speed;By changing magnetic field, the turbulence degree of heat conducting oil can be increased, the convective heat transfer coefficient can be improved, the fluid heat transfer can be strengthened, the formation of heat conducting oil coking can be slowed down, and the service life can be prolonged.

The invention discloses a functional split-flow blocking remover with a controllable distribution function, and particularly relates to the technical field of oil-gas field development, the functional split-flow blocking remover comprises a retarded acid system agent and a functional split-flow agent, the retarded acid system agent comprises the following raw materials in percentage by weight: 6-8% of hydrochloric acid, 2% of a chelating agent, 1-3% of villiaumite, 2-4% of inorganic salt hexahydrate, 1% of a corrosion inhibitor, 1% of a demulsifier, 1% of an iron ion stabilizer, 1% of a clay anti-swelling agent and 1% of a cleanup additive, and the functional shunting agent comprises the following components in percentage by weight: 2% of the functional shunting agent and the balance of water. The temporary plugging effect of the functional shunting agent and the special property of the retarded acid system agent are utilized, double transformation of a high-permeability zone and a low-permeability zone of a reservoir is achieved, and the purposes of evenly distributing acid, improving the acid etching effect and increasing the penetration distance are achieved; the wettability is changed by the nanofluid, the interfacial tension is reduced, so that the crude oil is stripped and displaced, and finally the acidification transformation and oil displacement yield increase of a heterogeneous reservoir or a low-permeability reservoir are realized.

The invention relates to the technical field of petroleum and natural gas exploration and development, in particular to nanoparticles and a method for evaluating adsorption characteristics of the nanoparticles on the surface of gas reservoir sandstone, and the method comprises the following steps: collecting a target gas reservoir sandstone core sample and preparing a fluorine-containing group functionalized SiO2 nanofluid; carrying out a static wetting contact angle determination experiment, and analyzing and determining the surface wettability of the rock slice soaked by the fluorine-containing group functionalized SiO2 nanofluid; a rock core displacement experiment is carried out, and the seepage capacity of the liquid in the saturated N2 rock core before and after the fluorine-containing group functionalized SiO2 nano-particle fluid is soaked is studied. The method solves the problem that the traditional adsorption characteristic experiment method of the polymer on the sandstone surface cannot systematically research the rock core imbibition characteristics and displacement characteristics before and after wettability reversal, and provides theoretical basis and technical support for relieving retrogression damage and improving the recovery ratio of condensate oil.

The present application relates to the technical field of fluid heat dissipation, in particular to a method, device, equipment and medium for analyzing heat transfer characteristics of nanofluid. The present application constructs a velocity calculation formula based on a power-law fluid model, then applies the velocity calculation formula to the slip length, fluid attribute information and pipeline attribute information to obtain the flow velocity of the nanofluid in the micro pipeline, then calculates the average temperature of the nanofluid in the micro pipeline based on the flow velocity, and finally calculates the Nusselt number of the nanofluid in the micro pipeline based on the average temperature. Since 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 micro pipeline, the flow velocity, average temperature and Nusselt number of the present application can describe the heat transfer characteristics of the nanofluid in the micro pipeline, so that the present application can apply the nanofluid to microscale cooling.

The invention provides a port oil spilling sewage treatment method and device, and relates to the technical field of port sewage treatment. The method comprises the following steps: gathering dispersed oil drops in sewage through an acoustic standing wave field to form an oil drop aggregate; injecting a magnetic nano-fluid of which the surface is modified with a bionic coating to form an oil drop-magnetic nano-particle complex; applying a gradient magnetic field to directionally migrate the complex; separating the migration complex from the water phase to obtain oil stain and purified water; and finally, the oil stains are desorbed from the surfaces of the magnetic nano-particles, and the magnetic nano-particles are recovered. According to the method, through the synergistic effect of acoustic aggregation, magnetic adsorption, magnetic field migration and multi-stage separation, efficient separation of oil drops and cyclic utilization of materials are achieved, and the method has the advantages of being high in treatment efficiency, environmentally friendly and low in cost.

The dynamic programmable nanofluid memristor comprises a tubular channel and a flexible built-in block, the tubular channel is filled with an electrolyte solution, and the inner surface of the tubular channel and the outer surface of the built-in block have hydrophilicity; the sizes of the tubular channel and the built-in block are gradually changed and have opposite changing directions, the built-in block is in clearance fit with the interior of the tubular channel to form a nanometer channel of a double-cone nested structure, the nanometer channel comprises a parallel section and a conical section, the size of the parallel section is smaller than that of the conical section, and the conical section is larger than the parallel section. The memristive effect is triggered by the ion concentration difference of the parallel section and the conical section under the action of an external electric field, the strength of the memristive effect is regulated and controlled by changing the lengths of the parallel section and the conical section, the dynamic regulation of the memristive performance is realized, and the memristive device has the advantages of high stability and reliability, flexible regulation and control mode, strong designability and the like.

This application relates to the field of liquid cooling technology, and discloses a highly stable, anti-sagging liquid-cooled composite nanofluid and its preparation method. The composite nanofluid comprises: deionized water and 1,2-propanediol as the continuous phase, graphene and single-walled carbon nanotube composite particles as the dispersed phase, and introduces a ternary rheological control system composed of a rheology modifier, polyvinylpyrrolidone, and a polymeric dispersant in a specific ratio, endowing the fluid with thixotropic and anti-sagging properties. This application improves the overall service stability and thermal management reliability of the liquid-cooled composite nanofluid under alternating high-speed pumping and static shutdown conditions.