40 results about "Phase transition" patented technology

A method and system for modulating vapor and liquid fractions of a cycling liquid-vapor fluid operating within its phase transition envelope by creating forced oscillating heat transfer between liquid and vapor fractions of the cycling stream. A liquid stream segment is expansion cooled and brought into thermal communication with a vapor stream segment. The contact with the expansion-cooled liquid enables intermolecular forces to drive condensation and release condensation heat at a condensation temperature higher than the temperature of the expansion-cooled stream segment. The resulting temperature gradient enables the expansion-cooled segment held at constant volume to capture the condensation heat and isochorically vaporize into a vapor stream segment that again is forced to condense so as to form an oscillating thermal cycle within the cycling liquid-vapor fluid.

The invention discloses a dynamic behavior analysis method and system for kiln high-temperature synthesis, and relates to the technical field of high-temperature material synthesis monitoring, and the method comprises the steps: obtaining time sequence data through a high-frequency temperature sensor, a reaction intermediate detector and a flue gas component monitor, and carrying out the feature extraction; the micro-scale adopts molecular dynamics simulation to obtain local reaction dynamic behaviors, and the macro-scale simulates kiln temperature distribution based on a finite element method; fusing the feedback relationship between the local reaction rate and the temperature distribution by using multi-scale coupling; dividing the high-temperature synthesis process of the kiln into a plurality of continuous recognizable states, judging whether a state jump condition is met or not, and performing multi-objective optimization iteration to obtain a dynamic behavior analysis result and phase change stage judgment. According to the method, dynamic feedback of the reaction rate and the temperature field is realized, key inflection points and phase change characteristics can be accurately captured, the fitting precision of kinetic parameters is remarkably improved, and the robustness and the adaptive capacity of the model are enhanced.

The invention relates to the technical field of cold storage, and particularly discloses a cold storage material and a preparation method and application thereof. Wherein the cold storage material comprises a Gd2O2Se crystal. The cold storage material comprises the Gd2O2Se crystal, and the Gd2O2Se crystal has phase transformation near 6.22 K, has relatively large specific heat in a temperature range of 1-10 K, has a remarkable magnetothermal effect and can be used as a cold storage material at a liquid helium temperature.

The invention relates to the technical field of numerical simulation of additive manufacturing nickel-based superalloy, and discloses a temperature field and phase field coupling simulation method of SLM forming nickel-based superalloy, which comprises the following steps: establishing a three-dimensional model of a forming part and a substrate for processing to obtain a temperature field basic model; simulating an SLM forming process on the temperature field basic model according to preset parameters to obtain temperature field data, and importing the temperature field data into a phase field simulation module to serve as predefined temperature field data; coupling the gamma ' / gamma mismatch degree and temperature correlation data to the basic phase field model to obtain a gamma' phase change model, correcting the gamma 'phase change model in combination with predefined temperature field data, and adding a nucleation model based on a Poisson seed method; and based on the gamma'phase change model and the nucleation model, growth and coarsening behaviors of the gamma 'phase in the SLM material increasing process are obtained, and a simulation report is formed. According to the method, the vacancy of gamma'phase structure evolution of the existing nickel-based superalloy with high (Al + Ti) content under the SLM complex thermal history condition is solved, and important help is provided for regulating and controlling the structure to obtain the required mechanical property.

This invention relates to a dual-mode singularity sensing system based on phase jump, comprising a sensing module composed of alternating layers of hyperbolic metamaterials and isotropic first dielectric layers. The sensing module exhibits a continuous-domain bound-state phenomenon when incident light propagates, and this continuous-domain bound-state phenomenon includes the ability to split into a pair of reflecting phase singularities with opposite topological charges. This invention extends singularity sensing technology from single-mode to dual-mode, enabling independent two-step measurements and exhibiting higher robustness to environmental perturbations.

The invention discloses a CO2 phase conversion dynamic monitoring system and method suitable for a CO2 conveying pipeline, and belongs to the technical field of CO2 capture, utilization and storage. The system comprises a gas supply system, a pressure control system, a phase change controller, a high-pressure loop system, a measuring device and a data processing device. According to the system, gas is supplied to two pieces of equipment in the phase change generation system through one gas supply system, transformation observation between different phase states is very comprehensive, and the research cost is saved. The pressure and temperature response conditions of CO2 phase change can be accurately and efficiently reflected by adjusting parameters such as pressure and temperature of the system.

A temperature testing system for hydrate nucleation and phase transition based on infrared imaging is provided and includes a gas-liquid supplying device, a refrigeration device, an infrared imaging device, a hydrate generation device, and a data acquisition device. The gas-liquid supplying device is configured to provide a gas and a liquid required for synthetizing a hydrate. The refrigeration device is configured to provide a temperature environment required for synthetizing the hydrate. The infrared imaging device is configured to in-situ measure temperature changes caused during a formation of the hydrate. The hydrate generation device is configured to provide a visual growth environment for nucleation and phase transition of the hydrate. The data acquisition device is configured to collect a temperature, a system pressure, and infrared imaging data from the hydrate generation device. The temperature testing system can accurately determine the temperature evolution during the nucleation, formation, and decomposition of the hydrate.

This invention belongs to the field of magnetic refrigeration technology, specifically relating to the application of a hexagonal crystal material Sr6GdSc(BO3)6 in ultra-low temperature magnetic refrigeration. This hexagonal crystal material Sr6GdSc(BO3)6 does not undergo a phase transition at temperatures above 100 mK and exhibits a large magnetocaloric effect near 1 K. The maximum magnetic entropy changes under magnetic field variations of 0–1 T, 0–2 T, and 0–3 T are 39.36 mJ·cm⁻¹, respectively. ‑3 · K ‑1 Or 9.01 J·kg ‑1 ·K ‑1 53.95 mJ·cm ‑3 ·K ‑1 Or 12.34 J·kg ‑1 ·K ‑1 and 59.49 mJ·cm ‑3 ·K ‑1 Or 13.61 J·kg ‑1 ·K ‑1 The hexagonal crystal material Sr6GdSc(BO3)6 of this invention exhibits significant magnetocaloric effects and superior low-temperature performance, and has great application prospects in the field of ultra-low temperature magnetic refrigeration technology.

The present application relates to a kind of composite dredging type non-ablation heat protection structure and its preparation method, which integrates steam cavity heat pipe and pulsating heat pipe flow channel;Steam cavity heat pipe starts under the heating of pulsating heat pipe flow channel, vapor flow cavity different regions occur phase change of working medium evaporation, vapor flow, vapor condensation, in the working medium condensation region, gaseous working medium capillary structure condenses, condensing working medium is transported by heat pipe channel from working medium condensation region to working medium evaporation phase transition region under the joint action of capillary force and gas pressure, after being transported to working medium evaporation phase transition region, it is phase transition into gaseous working medium, and so on, it is recycled, the heat flow inputted by pulsating heat pipe flow channel is dissipated in the form of full surface area radiation heat dissipation and reaches equilibrium state.

This invention provides a terahertz spectroscopy in-situ detection system and method for monitoring material phase transition processes, belonging to the field of spectroscopic analysis instrument technology. The system includes a terahertz spectroscopy detection system and a heated and temperature-controlled sample stage. The heated and temperature-controlled sample stage is electrically connected to a temperature control and feedback module, which monitors and adjusts the temperature of the heated and temperature-controlled sample stage in real time. Terahertz transparent windows of different specifications can be placed on the heated and temperature-controlled sample stage. This system is used to acquire the terahertz frequency domain spectral information of a sample in real time during the sample's phase transition process, and to perform terahertz spectral detection of the phase transition process under different temperature conditions. It achieves in-situ, continuous terahertz spectral detection of the sample under controlled temperature conditions, and provides stable and repeatable terahertz spectral observation of the material phase transition process under dynamic heating, isothermal, or variable temperature conditions, maintaining sufficient detection sensitivity and signal-to-noise ratio even with trace sample conditions.

The present application belongs to the technical field of natural gas hydrate exploitation, and discloses a device and method for real-time nondestructive calculation of equivalent specific heat in hydrate decomposition process. The device comprises a visual flat reaction kettle, a nondestructive high-precision phase state identification system, a gas and liquid inlet and exhaust system, and a computer acquisition system. The principle of the present application is that: through the method of providing uniform heat source by heat conduction outside the reaction kettle, hydrate decomposition is promoted, and internal heat convection can be ignored. Real-time volume fraction of each component is obtained by the nondestructive high-precision phase state identification system, Newton interpolation calculation is used for the volume fraction, latent heat of phase transition of hydrate deposit at adjacent temperature is calculated, and equivalent specific heat of hydrate deposit is obtained. The present application realizes real-time nondestructive calculation of equivalent specific heat field in hydrate decomposition process. The method is environmentally friendly and economical, and the device is clear and visual, which provides technical support for the research on latent heat of phase transition and equivalent specific heat in the process of hydrate exploitation.

The invention discloses a CO2 drive reservoir producing well shaft phase change point calculation method. The method comprises the following steps that S1, a bubble point temperature-pressure relation curve and a wax precipitation temperature-pressure relation curve of a target well are calculated; s2, calculating a temperature-well depth relation curve and a pressure-well depth relation curve of the target well under different working conditions; s3, calculating a bubble point temperature-well depth relation curve and a wax precipitation temperature-well depth relation curve under different working conditions; s4, calculating gas-liquid phase change point depths and wax precipitation phase change point depths under different working conditions; s5, obtaining a calculation formula and a calculation formula through multiple linear regression; s6, the actually-measured production conditions of the target well are substituted into the calculation formula, and the phase change point of the target well under the production conditions can be calculated. According to the method, rapid and accurate prediction of the phase change point of the shaft of the CO2 flooding producing well is realized.

A system comprising a sample heater configured to heat a sample and to determine a plurality of heat amounts applied to the sample at a plurality of times in a time interval; a temperature sensor configured to determine a plurality of temperatures of the sample at the plurality of times; and an analyzer module configured to: receive information indicating the plurality of heat amounts and the plurality of temperatures as functions of the plurality of times; and identify at least one phase transition in the sample during the time interval.

The application discloses a simulation experiment device for pressure pulsation change of liquid carbon dioxide phase transition in a borehole along a stratum, which comprises a limited-space liquid carbon dioxide phase transition pressure pulsation experiment container assembly, and the limited-space liquid carbon dioxide phase transition pressure pulsation experiment container assembly is externally wrapped with a rigid annular constant-temperature medium cavity assembly; the device further comprises a constant-temperature medium circulator which is connected with the rigid annular constant-temperature medium cavity assembly through a pipeline. The device can accurately invert the pressure pulsation law of the borehole in the process of injecting liquid carbon dioxide to displace gas in a coal mine underground. A design method of the simulation experiment device for pressure pulsation change of liquid carbon dioxide phase transition in a borehole along a stratum is also disclosed.

The present application relates to a kind of rectifying column target shell-and-tube heat exchanger fouling thermal resistance automatic monitoring method, according to the thermodynamic property parameter of the obtained rectifying column target shell-and-tube heat exchanger industrial stream obtains its stream phase transition interval, stream phase transition interval is pre-divided into corresponding preset number of substream phase transition interval, i.e. strict division stream phase transition interval is strictly divided, to each substream phase transition interval is evaluated, and the thermodynamic property of gas-liquid phase of each substream phase transition interval is respectively obtained, heat exchanger heat transfer model matched with the corresponding substream phase transition interval of target shell-and-tube heat exchanger is established, the clean total heat transfer coefficient and actual fouling total heat transfer coefficient of target shell-and-tube heat exchanger are calculated, and then the total fouling thermal resistance value of target shell-and-tube heat exchanger under current working condition is obtained, realizes the condenser and reboiler fouling thermal resistance automatic monitoring method of rectifying column, improves calculation accuracy.

This application relates to the field of infrared temperature measurement technology, and provides a closed-loop control method and system for solder temperature based on infrared temperature measurement feedback. It addresses problems such as significant deviations in temperature measurement results from the true value in the critical phase transition region and inaccuracies caused by failure to consider material state changes. This application detects the ambient temperature of the welding area and the initial temperature value of the solder during the welding process to obtain solder phase transition emissivity data; determines the real-time state of the solder, and obtains the calibrated solder temperature by combining the solder phase transition emissivity data and the ambient temperature; compares the calibrated solder temperature with the phase transition temperature range to obtain the temperature comparison result, and obtains the adjusted heating power parameters based on the calibrated solder temperature; controls the solder heating device to heat the solder according to the adjusted heating power parameters until a calibrated solder temperature within the preset target temperature range is obtained, achieving high-precision real-time calibration and dynamic closed-loop control of the solder temperature, ensuring that the welding process remains stably within the target temperature range.

This application provides an automatic detection method and apparatus for phase transition points of phase change copper foil, comprising: separating waveform features of different micro-mechanisms based on the acoustic spectrum distribution data and the initial energy intensity ratio of each frequency band, extracting the low-frequency energy ratio and high-frequency energy ratio, and determining the preliminary type of the phase transition micro-mechanism; extracting signal features of specific frequency bands for the preliminary type of the phase transition micro-mechanism, and determining the real-time stage division of the phase transition process; analyzing the quantitative result of the phase transition completion degree based on the enhanced phase transition core frequency band energy distribution information; verifying the correspondence between the micro-mechanism features and the background energy based on the quantitative result of the phase transition completion degree, confirming the dominant mechanism of the phase transition process, and obtaining the automatic detection result of the phase transition point of the phase change copper foil.

The application relates to the technical field of metal material development, in particular to a method for reconstructing the orientation of original beta-Ti grains before phase transition, characterized by the following steps: step 1) adopting a {110} hcp polar diagram of a phase transition product to perform orientation reconstruction, four characteristic triangles on the polar diagram are found, that is, four (111) bcc surface polar points of the original beta-Ti grains; step 2) determining the phase transition product area of the same original beta-Ti grain according to the polar diagram, and determining the centers of the four characteristic triangles on the corresponding polar diagram; step 3) measuring the projection coordinates of the four centers to obtain the crystal direction corresponding to each center; and step 4) calculating a [100] and [001] direction matrix, and obtaining the orientation matrix M of the original beta-Ti grain after processing. The application has the beneficial effect that the orientation of the original beta-Ti grain before phase transition is reconstructed, the orientation accuracy of the reconstructed original beta-Ti grain is high, the accuracy requirement in the titanium material production process is fully met, the calculation method is simple, the operation amount is small, and the application range is wide.​

The present invention relates to an artificial intelligence-based method and system for generating a composition-temperature phase diagram of a ferroelectric material. The method comprises: acquiring a variable-doped ferroelectric material chemical formula, and setting same in the form of a character string; setting variation ranges and step sizes for both the doping ratio and the temperature; processing chemical elements and doping ratios in the variable-doped ferroelectric material chemical formula in the form of the character string to obtain a chemical formula numerical vector list; on the basis of the variation range and step size set for the temperature, forming a temperature list, and performing normalization processing to obtain a normalized temperature list; performing merging on the basis of the chemical formula numerical vector list and the normalized temperature list, and inputting data into a pre-trained crystalline phase transition artificial intelligence model to output a crystal structure type; and on the basis of the crystal structure type, drawing composition-temperature phase diagrams of the variable-doped ferroelectric material chemical formula under different doping ratios and different temperature conditions. Compared with the prior art, the present invention has the advantages such as automatically generating component-temperature phase diagrams.

This application discloses a method and apparatus for simulating salt ion migration during ice-water phase transitions. The method includes determining the basic physical parameters of salt ions, including melting temperature, solute equilibrium distribution coefficient, diffusion coefficient in unfrozen solution, diffusion coefficient in ice, thermal diffusivity of unfrozen solution and ice, specific heat capacity, latent heat of phase transition, and latent heat of salt crystallization; constructing a phase field model represented by coupled differential equations based on these basic physical parameters; and solving the coupled differential equations to obtain phase field distribution results, concentration distribution results, and temperature distribution results. In this method, phase field values ​​are introduced to distinguish between the different thermodynamic states of the solid and liquid phases, establishing a phase field model for phase transition that couples the phase field, concentration field, and temperature fields. The model parameters of the phase field model consider the contribution of salt crystallization and the influence of the ion precipitation process in ice under freezing conditions, thereby improving the simulation results of ion migration in salt solutions during freezing.

A method for measuring the physical properties of liquid / solid electrolytes, belonging to the field of nonferrous metallurgy, specifically discloses a finite element analysis-assisted thermal analysis method to obtain the thermal conductivity, primary crystallization temperature, electrolyte composition, and latent heat of phase transition of liquid / solid electrolytes. The method includes the following steps: measuring the thermal analysis curve of a liquid molten salt sample during cooling using a sensor; simulating the behavior of the thermal analysis curve using a sensor physical model established by finite element analysis; and comparing and analyzing the numerical thermal analysis curve and the measured thermal analysis curve to obtain the corresponding liquid / solid thermal conductivity, primary crystallization temperature, electrolyte composition, and latent heat of phase transition of the molten salt system. The method described in this invention can rapidly obtain the thermal conductivity, primary crystallization temperature, molten salt composition, and latent heat of phase transition of solid / liquid inorganic salts and multi-component mixtures, enabling online measurement of relevant physical properties of liquid molten salts and solid electrolytes, and possesses practicality and economy.

The invention discloses an experimental device and an experimental method for a phase change process of a liquid-solid energy harvesting material, and belongs to the technical field of experimental equipment. The experimental device comprises a pressurization system, a liquid level monitoring device, a phase-change heat exchange cylinder and a radial size recording camera. The liquid level monitoring device is provided with a columnar sealing cavity filled with a phase change material and a liquid level monitoring sensor; the pressurizing system is used for pressurizing and measuring the pressure of the sealing cavity; the phase-change heat exchange cylinder is composed of a metal heat exchange pipe, a center liquid supplementing column and inner fins, an inner sealed heat exchange cavity is divided into an inner cylinder cavity and an outer ring cavity through a cylindrical heat insulation wall, the outer ring cavity is provided with radial inner fins, and a transparent end cover at the top facilitates recording of radial phase-change boundary images. The device has the advantages of being flexible in structure, visible in process, quantifiable in data and the like, and provides support for research and application of a liquid-solid energy harvesting technology in a marine environment.

The application discloses a simulation method of elastic-viscoplastic material phase transition based on a material point method, which is characterized by the following steps: 1) a unified numerical model for describing the elastic-viscoplastic material and non-Newtonian fluid phenomenon is established for simulating the material in the phase transition process; 2) Allen-Cahn and Cahn-Hilliard phase field equations are discretely modeled and introduced into the material point method; and 3) an elastic-viscoplastic material control strategy driven by phase field evolution is introduced to eliminate the discontinuity in performance caused by the change of physical properties of the mixed contact surface in the process. Compared with the prior art, the application has the advantages that the simulation of the three states of solid, intermediate and liquid of the complex elastic-viscoplastic material is simulated, the details generated by the evolution between phases are simulated, a new flexible phase field evolution based on the material point method and the corresponding material performance can be seamlessly and controllably displayed, and thus a realistic phase transition simulation effect is realized, and the application has a unique advantage in the generation of complex phase transition animation.

The present invention provides a method and application for measuring the activation energy and characteristic relaxation time of nanoscale magnetic structure phase transitions. This method utilizes the Lorentz mode of a transmission electron microscope to observe the dynamics of magnetic phase transitions in thin samples. By preparing thin samples with nanometer-scale thickness and geometric dimensions and using laser irradiation thermal demagnetization to eliminate the thermal retention effect of the magnetic phase transition, the method accurately obtains dynamic parameters such as the characteristic relaxation time and activation energy of nanoscale magnetic structure phase transitions. This method provides a novel and practical method for characterizing the magnetodynamic processes and intrinsic magnetic properties of magnetic materials.

The invention discloses a tailing filling body damage prediction method based on a phase change theory and acoustic emission parameters, and belongs to the field of structural health monitoring, and the method comprises the following steps: firstly, obtaining component and crystal structure data of a material, and constructing a self-consistent free energy function with a clear physical image; and then, inputting a free energy function into the phase change theoretical model, calculating and comparing free energy of different phases under different components and temperatures by solving equilibrium state conditions with the chemical potential phase as the core, thereby determining the thermodynamic stable phase and the coexistence relationship thereof, and finally outputting a predicted phase diagram. The method directly starts from the basic physical parameters of the material, the dependence on a large amount of empirical data and parameter fitting is remarkably reduced, the phase equilibrium relation between a new material system and a complex multi-element system can be efficiently and reliably predicted, and an efficient calculation tool is provided for material design and development.

The invention relates to the technical field of refrigerant recovery, in particular to a medium phase change purging recovery system and a control method thereof.The medium phase change purging recovery system comprises a pressure reducing valve, a first one-way valve, a tail end workpiece, an evaporator set, a liquid storage tank and a drain valve; wherein the inlet end of the pressure reducing valve is a gas source inlet, and the gas outlet end of the drain valve is a gas source outlet; a refrigeration system; the device further comprises a first temperature sensor and a second temperature sensor. A heater; wherein the detection temperature of the first temperature sensor is T1, the detection temperature of the second temperature sensor is T2, and when T1-T2 is smaller than or equal to T, the heater and the refrigerating system are started; wherein T is a fixed temperature value of T1-T2 measured when most of the refrigerant in the refrigerant recovery pipeline is discharged. According to the medium phase change purging recovery system and the control method thereof, whether the heater is connected to heat the dry gas or not is judged according to the temperature difference of the gas entering the tail end workpiece and the gas exhausted out of the tail end workpiece, accurate control is achieved, and energy waste is reduced.

This invention relates to the field of molten salt energy storage technology, and particularly to an online monitoring method and system for molten salt energy storage. The method uses a distributed temperature sensing network and infrared thermal imaging equipment to periodically collect thermal data from each zone of the energy storage unit, and combines this with a deep learning model to analyze the phase transition degree index. Based on real-time operating parameters and thermodynamic state characteristics, it simulates the spatiotemporal evolution of phase transition, generating dynamic range vector data of the phase transition front. Based on the correlation between heat conduction topology and molten salt components, it fuses and recombines multi-scale data to form a phase transition heat distribution map, identifying inefficient latent heat flux accumulation areas. It collects micro-thermal environment parameters and analyzes gradient characteristics to quantify the latent heat flux per unit time. When the flux is lower than the warning threshold, it automatically sends an efficiency anomaly warning signal to the control center, achieving precise monitoring and intelligent early warning.

The present application belongs to the field of oil and gas field development, and particularly relates to a multi-scale CO2 flooding oil component migration monitoring device and method. The present application sets a long and thin tube variable diameter assembly to build a displacement path with a length of meters or more. Compared with a conventional short core experiment, the present application can carry out displacement experiments on a longer migration scale, thereby being more conducive to characterizing the long-range migration process of CO2 in a porous medium and the formation and evolution characteristics of a miscible phase transition zone. By sequentially setting a matrix pore section, a micro-fracture channel section and a fault blocking section in the device, fluid migration behaviors in different types of seepage channels, including matrix seepage, fracture dominant channel migration and local blocking effect, can be simulated in the same experimental system, thereby improving the adaptability of experimental results to complex reservoir seepage characteristics. By arranging multi-point sampling units along the displacement direction and combining with gas phase component analysis means, dynamic monitoring of CO2 and hydrocarbon components inside the device is realized.

A method for evaluating melt fragmentation in a sodium-cooled fast reactor (SFR), in which a high-order accurate particle method is adopted to discretely solve a corresponding model and calculate the melt fragmentation process in the SFR. A least-squares moving particle semi-implicit method with high-order accuracy for gradient and Laplace models is used, and a particle-shifting technique is used to maintain a more uniform particle distribution. A geometry-based free surface identification technique is adopted. An equation-of-state model is introduced to enable acquisition of more realistic physical parameters. The solid-liquid coupling model and the phase transition model are combined to carry out the high-order accurate discretization. An evaluation system is also provided. The melt fragmentation data can be updated to the system in real time, and a real-time dynamic graph of the melt fragmentation process is automatically generated, and real-time dynamic cloud graphs of different influencing factors are automatically generated.

This invention discloses a method for predicting the surface morphology and dynamic behavior of materials under laser irradiation, belonging to the field of laser surface processing technology. The method includes: determining the parameters of the target material, the laser source parameters, and the geometric dimensions of the target material; determining the energy deposited onto the target material using Beer-Lambert's law; updating the thermodynamic state of free electrons using the generalized finite difference method based on a dual-temperature model; simulating the ablation and evaporation phase transition processes of the material using thermoelasticity governing equations; and simulating the flow and cooling solidification processes of the molten pool using fluid dynamics and nucleation kinetics equations, thereby achieving the prediction of the surface morphology and dynamic behavior of materials under laser irradiation. This invention uses the above method to construct a simulation model of the ablation and removal process of material surfaces under laser irradiation, providing theoretical support and computational tools for accurately predicting the surface morphology and dynamic behavior of materials.