22 results about "Phase transition" patented technology

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 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.

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 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 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.

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 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.

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.

The application provides an isothermal heating method, a phase change measurement method and a pulsed laser isothermal heating system. The isothermal heating method comprises the following steps: obtaining a target sample; and irradiating a target region on the target sample with a target laser within a preset target time length, so that the temperature of the target region is maintained at a preset temperature within a preset temperature error. Through the isothermal heating method, the accuracy and consistency of experimental results are ensured, so that the corresponding relationship between the phase change temperature and the phase change time can be accurately determined.

A numerical simulation analysis method for the swelling and bursting of pressurized water reactor fuel rod cladding, relating to the field of reactor safety analysis technology, includes: obtaining constant parameters of the fuel rod cladding; establishing and meshing a geometric model; assigning physical property values ​​to each element mesh; calculating the temperature distribution of the fuel rod cladding and determining whether a phase transition has occurred; if a phase transition has occurred, calculating the phase transition process of the cladding material; if the phase transition is complete or has not occurred, calculating the creep and plastic behavior of the cladding material; updating the effective stress and effective strain rate of the cladding material, and then calculating the yield stress of each element mesh; determining whether both the effective strain rate and yield stress have reached the corresponding failure thresholds; if neither has reached the threshold, repeating the calculation; if either reaches the failure threshold, performing a dynamic bursting process calculation of the cladding until the pressure inside and outside the cladding is balanced, and simulating the dynamic bursting process of the cladding; this method addresses the limitations and inaccurate results of traditional bursting analysis.

The embodiment of the application provides an ice-under carbon dioxide phase change fracturing experiment observation method and device, comprising: building an ice-water coupling experiment scene by a comprehensive experiment ice tank; a micro phase change directional excitation system generates a directional phase change jet, a stress wave and a pulsating bubble, transports liquid carbon dioxide and monitors medium storage, and triggers a liquid carbon dioxide phase change reaction; a multi-physical field synchronous observation system records ice surface and ice bottom crack propagation morphology, monitors ice layer damage deformation characteristics, and captures underwater shock wave propagation and pulsating pressure change law; an experimental ice sample preparation system regulates experimental environment temperature, restricts ice sample forming size, and completes underwater sensor position adjustment, attitude locking and ice layer fixed-point pre-embedding layout; a central synchronous control system is connected with each system in signal, so as to unify time sequence scheduling and complete microsecond-level hard synchronous triggering and data acquisition. The device provides an intuitive and accurate experiment platform and underlying data support for the design and optimization of a new type of environmentally friendly icebreaking equipment.

The invention belongs to the technical field of rock blasting, and discloses a carbon dioxide phase change fracturing test system and test method. The carbon dioxide phase change fracturing test system comprises a loading pipe, a phase change pipe, a detection assembly and a hydraulic fracturing simulation device, wherein the loading pipe is used for accommodating fracturing fluid; the multiple phase change pipes are sequentially communicated with the loading pipe in the length direction of the loading pipe, and the phase change pipes are used for conducting phase change expansion on carbon dioxide; the multiple detection assemblies are sequentially arranged in the length direction of the loading pipe, each detection assembly comprises a pressure sensor and a temperature sensor, the loading pipe is provided with a pressure release opening, and at least one detection assembly is arranged at the pressure release opening; the hydraulic fracturing simulation device is connected to the pressure release opening and used for simulating the lithologic material. The carbon dioxide phase change fracturing test system can accurately analyze and determine the excitation time between different phase change pipes so as to generate stronger blasting capacity through superposition of carbon dioxide phase change pressure in the multiple phase change pipes.

The present application relates to refrigerant recovery technical field, specifically to a kind of medium phase change purging recovery system and control method thereof, comprising, pressure reducing valve, first check valve, end workpiece, evaporator group, liquid storage tank and drain valve;Wherein the inlet end of pressure reducing valve is gas source import, and the gas outlet end of drain valve is gas source export;Refrigeration system;Still include first temperature sensor, second temperature sensor;Heater;Wherein: the temperature detected by first temperature sensor is T1, and the temperature detected by second temperature sensor is T2, when T1-T2≤T, start heater and refrigeration system;Wherein T is the fixed temperature value of T1-T2 measured when most of refrigerant in refrigerant recovery pipeline is discharged.The medium phase change purging recovery system and control method thereof of the present application judge whether to access heater to heat dry gas by the temperature difference of gas entering end workpiece and discharging end workpiece, accurate control, reduce energy waste.

This invention discloses a spontaneous phase-change luminescent material, a heat exposure monitoring material, its preparation method, and its application, relating to the field of smart materials technology. The structural formula of the spontaneous phase-change luminescent material is: [Formula omitted for brevity]; where R is an alkyl group with 4-6 carbon atoms. After the spontaneous phase-change luminescent material provided by this invention is prepared into a film, a phase transition occurs at a certain temperature, and the phase transition rate varies at different temperatures; the higher the temperature, the faster the phase transition. As the phase transition proceeds, the luminescence (specifically photoluminescence) color changes, and this color change can be completed within minutes or hours. Therefore, it has a heat exposure monitoring function and a fast response rate.