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Journal articles on the topic 'Thermal field method'

Author: Grafiati

Published: 28 May 2022

Last updated: 30 May 2022

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1

Kishimoto, Satoshi, and Yoshihisa Tanaka. "OS01F067 Two-Dimensional Electron Moire Method Using Digital Thermal Field Emission Scanning Electron Microscope." Abstracts of ATEM : International Conference on Advanced Technology in Experimental Mechanics : Asian Conference on Experimental Mechanics 2011.10 (2011): _OS01F067——_OS01F067—. http://dx.doi.org/10.1299/jsmeatem.2011.10._os01f067-.

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2

Xue, Chun Fang. "Method of Lines to Solve the Linear Temperature Field of LENS." Advanced Materials Research 1120-1121 (July 2015): 1441–45. http://dx.doi.org/10.4028/www.scientific.net/amr.1120-1121.1441.

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This article introduces a semi-analytical numerical method ——method of lines(MOLs) to solve steady temperature field of Laser Engineered Net shaping (LENS). The main idea of MOLs is to semi-discretized the governing equation of thermal transfer problem into a system of ordinary differential equations (ODEs) defined on discrete lines by means of the finite difference method. The steady linear temperature fields of functionally graded materials were obtained using MOLs and the regularities of different temperature functions were also found. The effects of thermal conductivity coefficient under different formal functions on thermal temperature fields were analys. Numerical results showed that different material thermal conductivity function had obvious different effect on the temperature field.

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3

Tan, Wei, Chang Qing Sun, Chun Fang Xue, and Yao Dai. "Method of Lines to Solve 2-D Steady Temperature Field of FGM." Key Engineering Materials 353-358 (September 2007): 2003–6. http://dx.doi.org/10.4028/www.scientific.net/kem.353-358.2003.

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Method of Lines (MOLs) is introduced to solve 2-Dimension steady temperature field of functionally graded materials (FGMs). The main idea of the method is to semi–discretized the governing equation of thermal transfer problem into a system of ordinary differential equations (ODEs) defined on discrete lines by means of the finite difference method. The temperature field of FGM can be obtained by solving the ODEs with functions of thermal properties. As numerical examples, six kinds of material thermal conductivity functions, i.e. three kinds of polynomial functions, an exponent function, a logarithmic function, and a sine function are selected to simulate spatial thermal conductivity profile in FGMs respectively. The steady-state temperature fields of 2-D thermal transfer problem are analyzed by the MOLs. Numerical results show that different material thermal conductivity function has obvious different effect on the temperature field.

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4

Pasti, Luisa, Filippo Bedani, Catia Contado, Ines Mingozzi, and Francesco Dondi. "Programmed Field Decay Thermal Field Flow Fractionation of Polymers: A Calibration Method." Analytical Chemistry 76, no. 22 (2004): 6665–80. http://dx.doi.org/10.1021/ac049399q.

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5

Ohmura, Takahiro, Tseng-Wen Lian, Akira Kondo, Ryo Hayasaka, and Makio Naito. "Measurement Method of Thermal Conductivity in Ununiformed Temperature Field." Netsu Bussei 31, no. 4 (2017): 166–73. http://dx.doi.org/10.2963/jjtp.31.166.

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6

Douglass, D. A., A. A. Edris, and G. A. Pritchard. "Field application of a dynamic thermal circuit rating method." IEEE Transactions on Power Delivery 12, no. 2 (1997): 823–31. http://dx.doi.org/10.1109/61.584390.

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7

Park, Keunsoo, Maria Fernandino, and Carlos A. Dorao. "Thermal two-phase flow with a phase-field method." International Journal of Multiphase Flow 100 (March 2018): 77–85. http://dx.doi.org/10.1016/j.ijmultiphaseflow.2017.12.005.

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8

Sobrino, JoséA, and Vicente Caselles. "A field method for measuring the thermal infrared emissivity." ISPRS Journal of Photogrammetry and Remote Sensing 48, no. 3 (1993): 24–31. http://dx.doi.org/10.1016/0924-2716(93)90061-q.

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9

Lin, Ze Jin, Jie Hong Yuan, Yuan Li, Xi Jie Yan, Shi Ming Zhou, and Run Jing Chen. "A Temperature Field Model of Complicated Thermal Analysis System Based on Thermal Network Method." Advanced Materials Research 694-697 (May 2013): 695–98. http://dx.doi.org/10.4028/www.scientific.net/amr.694-697.695.

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Based on the thermal network method and heat transfer theory, a temperature field simulation model of complicated thermal analysis system was established by Matlab Simulink. Based on the model, a steady-state temperature field of a helicopter tail reducer was calculated in the normal lubrication. The model is more accurate and reliable than the traditional algorithm. Meanwhile, the model can calculate the time-varying process of the temperature field, corresponding to the transient temperature field.

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10

Sobamowo, M. G. "THERMAL PERFORMANCE ANALYSIS OF CONVECTIVE-RADIATIVE FIN WITH TEMPERATURE-DEPENDENT THERMAL CONDUCTIVITY IN THE PRESENCE OF UNIFORM MAGNETIC FIELD USING PARTIAL NOETHER METHOD." Journal of Thermal Engineering 4, no. 5 (2018): 2287–302. http://dx.doi.org/10.18186/thermal.438485.

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11

ALTHERR, T. "INTRODUCTION TO THERMAL FIELD THEORY." International Journal of Modern Physics A 08, no. 32 (1993): 5605–28. http://dx.doi.org/10.1142/s0217751x93002216.

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This is a very basic introduction and short (and of course incomplete) overview of thermal field theory. In the first part, I introduce the thermal propagator at a very simple level and give the Feynman rules using the time-path contour method. In the second part, I give examples of these rules in scalar theory and discuss the origin of the thermal mass and other important effects as infrared divergences and phase transitions. In the third part, I outline the resummation program of Braaten and Pisarski.

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12

Groz, Marie-Marthe, Mohamed Bensalem, Alain Sommier, et al. "Estimation of Thermal Resistance Field in Layered Materials by Analytical Asymptotic Method." Applied Sciences 10, no. 7 (2020): 2351. http://dx.doi.org/10.3390/app10072351.

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In this paper, the problem of the quantitative characterization of thermal resistance fields in a multilayer sample is addressed by using the classical front face flash method as the thermal excitation and infrared thermography (IRT) as the monitoring sensor. In this challenging problem, the complete inverse processing of a multilayer analytical model is difficult due to the lack of sensitivity of some parameters (layer thickness, depth of thermal resistance, etc.) and the expansive computational iterative processing. For these reasons, the proposed strategy is to use a simple multilayer problem where only one resistive layer is estimated. Moreover, to simplify the inverse processing often based on iterative methods, an asymptotic development method is proposed here. Regarding the thermal signal reconstruction (TSR) methods, the drawback of these methods is the inability to be quantitative. To overcome this problem, the method incorporates a calibration process originating from the complete analytical quadrupole solution to the thermal problem. This analytical knowledge allows self-calibration of the asymptotic method. From this calibration, the quantitative thermal resistance field of a sample can be retrieved with a reasonable accuracy lower than 5%.

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13

Putranto, Angky Wahyu, Sakinah Hilya Abida, Khodijah Adrebi, and Arta Harianti. "Lignocellulosic Analysis of Corncob Biomass by Using Non-Thermal Pulsed Electric Field-NaOH Pretreatment." Reaktor 20, no. 4 (2020): 183–91. http://dx.doi.org/10.14710/reaktor.20.4.183-191.

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In recent years, the second-generation bioethanol and advanced bio-based material production from biomass are focused on the pretreatment process by separating cellulose components from other components such as lignin and hemicellulose. Therefore, a physicochemical pretreatment method is needed by applying a non-thermal pulsed electric field (PEF) and alkali methods to increase the cellulose availabilities with a short process and low energy input. The aim of this study was to analyze the lignocellulose content of corncob biomass by using non-thermal pulsed electric fields (PEF) and NaOH pretreatment. The pretreatment factors used were the electric field strength of PEF and the pretreatment time. Analysis of the structure and elements of the lignocellulose based on the characteristics of the gravimetric method and SEM-EDX for untreated and treated samples. The results showed that pretreatment of corncobs biomass by using PEF optimally at an electric field strength of 9 kV/cm and pretreatment time of 60 seconds that was increasing cellulose of 40.59% when compared with the control and also decreasing the hemicellulose and lignin content of 12.9% and 2.02%, respectively. Under these conditions, the energy per pulse and specific input energy of PEF required 0.0205 J and 8.72 kJ/L, respectively. The microstructure analysis by using SEM-EDX showed significantly visual differences and was an increase in the percentage of C and O atoms between untreated and treated corncob biomass. Furthermore, the corncob biomass treated by using non-thermal PEF and alkali can become effective and efficient for the next process into cellulose-derived products.Keywords: corncob biomass; pulsed electric field; NaOH; pretreatment; cellulose

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14

Moallem, M., and R. Jafari. "Transformation method in the coupled FE magneto-thermal field analysis." IEEE Transactions on Magnetics 34, no. 5 (1998): 3126–29. http://dx.doi.org/10.1109/20.717732.

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15

Suh, Min-hо, and Tai-yong Lee. "Thermal Field Simulation of LEC Process by Finite Volume Method." IFAC Proceedings Volumes 31, no. 11 (1998): 523–27. http://dx.doi.org/10.1016/s1474-6670(17)44980-9.

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16

Garncarek, Zbigniew, and Jerzy Idzik. "Degree of heterogeneity of thermal field a method of evaluation." International Journal of Heat and Mass Transfer 35, no. 11 (1992): 2769–75. http://dx.doi.org/10.1016/0017-9310(92)90297-6.

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17

Ode, Machiko, and Ikuo Ohnuma. "A thermal fluctuation-based nucleation method for phase-field models." Computational Materials Science 194 (June 2021): 110448. http://dx.doi.org/10.1016/j.commatsci.2021.110448.

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18

Ma, Kang, and Huimin Xie. "Coherent gradient sensing method for measuring thermal stress field of thermal barrier coating structures." Theoretical and Applied Mechanics Letters 7, no. 1 (2017): 13–16. http://dx.doi.org/10.1016/j.taml.2017.01.002.

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19

Song, Ki-Chang, Eun-Kee Kim, and In-Jae Chung. "Measurement of thermal diffusion parameters of polystyrene using a thermal field flow fractionation method." Korean Journal of Chemical Engineering 3, no. 2 (1986): 171–75. http://dx.doi.org/10.1007/bf02705029.

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20

LIAO, ZhiRong, JianHan ZHANG, and ZhiFeng WANG. "Heliostat-field thermal mechanics coupling design method of a high-temperature collector field for next-generation solar thermal power." SCIENTIA SINICA Technologica 50, no. 10 (2020): 1316–28. http://dx.doi.org/10.1360/sst-2020-0084.

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21

Chen, Li Zi, Chun Yuan Jing, and Xiao Wei Guan. "Laser-Induced Thermal Damage to K9 Glass on Finite Element Method." Applied Mechanics and Materials 444-445 (October 2013): 1422–26. http://dx.doi.org/10.4028/www.scientific.net/amm.444-445.1422.

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Based on the theory of the thermal conduction and the thermal elastic equations, does some researches in view of the thermal Damage of K9 glass by finite element analysis. The distribution of temperature field and thermal stress field of the ideal K9 glass which irradiated by 100W pulsed-Nd: YAG laser are simulated with finite element software. The result shows that the temperature of the surface of glass doesnt reach the melting and the thermal stress of it doesnt get to the requirement for fracture strength. Then, the model of K9 glass containing inclusions has be built. The simulation result indicates that inclusions may affect the distribution of temperature field and thermal stress field of the K9 glass, which makes the injected laser beams energy centralize on a small area around the inclusions owing to the existence of the strong absorbing, thus leading to K9 glass laser damage threshold reduction and easier to thermal damage.

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22

Rostislav, Liutyi. "Analytical method of calculation of thermal fields of cast parts during crystallization." Theory and practice of metallurgy 1,2021, no. 1,2021(126) (2021): 5–13. http://dx.doi.org/10.34185/tpm.1.2021.01.

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The aim of the work is to create a mathematical method that allows to calculate the distribution of thermal fields in cast parts during crystallization using a system of analytical formulas. During the calculations, a combination of known analytical formulas GF was used. Balandin, AY Weinik, S. Schwartz with their own original mathematical solutions created on the basis of the analysis of thermophysical processes in castings in the process of their crystallization. Computer simulation of thermal fields using the LVMFlow program was used to compare the results. According to the created mathematical method, examples of calculation of thermal fields for two castings made of steel 25L of hollow cylindrical shape, the wall thickness of which is 100 mm and 4 mm, respectively, are given. Calculations were performed for the conditions of crystallization of castings in a single sand form. The comparison of results of calculations by the developed method and with use of the existing software is presented. For the first time, based on our own mathematical and thermophysical developments, a comprehensive calculation method for determining the thermal field of the casting during crystallization and cooling was developed. casting. The technique is expressed in a number of analytical formulas, each of which describes a specific thermal process that occurs in the casting. This takes into account the features of the casting configuration. The created complex method of calculation of thermal fields of cast parts is a mathematical basis for determining the thermal fields of molds and rods, which allows to predict their properties and select the optimal molding materials. The created technique can also be offered as a mathematical basis for refining applied computer programs for foundry production. CASTING, TEMPERATURE, THERMAL FIELD, COOLING DYNAMICS, COOLING DURATION, MATHEMATICAL LAW, COLORING FRONT, CALCULATION

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23

Chen, Xue Jun, and Qi Liu. "Simulation of Temperature Field and Thermal Stress Field during Laser Drilling." Applied Mechanics and Materials 217-219 (November 2012): 2226–29. http://dx.doi.org/10.4028/www.scientific.net/amm.217-219.2226.

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In this paper, the finite element simulation of laser drilling process has been carried out for the nickel alloy DD6. Both the transient temperature field and thermal stress field were computed via the commercial software package ANSYS. Based on the method of dimensional analysis, the dependence of various non-dimensional parameters on both fields was specified and demonstrated in graphical forms.

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24

Mallick, Ashis, Rajiv Ranjan, Dilip K. Prasad, and Ranjan Das. "INVERSE PREDICTION AND APPLICATION OF HOMOTOPY PERTURBATION METHOD FOR EFFICIENT DESIGN OF AN ANNULAR FIN WITH VARIABLE THERMAL CONDUCTIVITY AND HEAT GENERATION." Mathematical Modelling and Analysis 21, no. 5 (2016): 699–717. http://dx.doi.org/10.3846/13926292.2016.1225606.

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In the present work, various thermal parameters of an annular fin subjected to thermal loading are inversely estimated using differential evolution (DE) method. In order to obtain the temperature field, the second order nonlinear differential equation for heat transfer with variable thermal conductivity and internal heat generation is solved using Homotopy Perturbation Method (HPM). Classical thermoelasticity approach coupled with an HPM solution for temperature field is employed for the forward solution of thermal stresses. It is interesting that the internal heat generation does not affect the radial stresses, while the temperature field and the tangential stresses are influenced by the heat generation parameters. As the tangential stresses are mainly responsible for mechanical failure due to thermal loading in an annular fin, the unknown thermal parameters are inversely estimated from a prescribed tangential stress field. The reconstructed stress fields obtained from the inverse parameters are found to be in good agreement with the actual solution.

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25

NOR AZWADI, C. S., and T. TANAHASHI. "SIMPLIFIED FINITE DIFFERENCE THERMAL LATTICE BOLTZMANN METHOD." International Journal of Modern Physics B 22, no. 22 (2008): 3865–76. http://dx.doi.org/10.1142/s0217979208048619.

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In this paper, a well-known finite difference technique is combined with thermal lattice Boltzmann method to solve 2-dimensional incompressible thermal fluid flow problems. A small number of microvelocity components are applied for the calculation of temperature field. The combination of finite difference with lattice Boltzmann method is found to be an efficient and stable approach for the simulation at high Rayleigh number of natural convection in a square cavity.

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26

Li, Shi Dong. "A Simple Design Method for Thermal Performance of Parabolic Troughs Solar Field." Advanced Materials Research 827 (October 2013): 57–60. http://dx.doi.org/10.4028/www.scientific.net/amr.827.57.

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In this paper, a simple design method for 1 MW parabolic troughs solar power is discussed.The design of a thermal performance of parabolic troughs solar field was developed in China. In the design process, the following factors were analyzed: beam irradiance,parabolic troughs solar field area, heat loss, inlet temperature and flow rate. The simple method was established with the energy balance analysis base on the simplified heat loss of the parabolic troughs , The model was also used to calculate thermal performance of parabolic troughs solar field. Conclusions of this paper are good references for the engineering design to quickly determine the thermal performance of parabolic troughs solar field.

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27

Cheng, Tao, and Ke Qin Yan. "Application of Finite Element Method of Composite Wall Insulation System." Advanced Materials Research 594-597 (November 2012): 2158–61. http://dx.doi.org/10.4028/www.scientific.net/amr.594-597.2158.

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In this paper, the thermal stress characteristics of polystyrene plate - thin plaster wall are present. A three-dimensional element is selected to mesh the wall model, which can simulate the coupling effects of thermal stress and structural stress field. Thermal stress and deformation distribution are proposed after comparing and analyzing the two simulation results. Numerical simulation results indicate that: (1) Polystyrene plates thin plaster wall insulation system has very good thermal insulation properties；(2) Different stress fields concentrate significantly around windows and in the middle of wall especially around the windows. (3) The deformation of the polystyrene plate - thin plaster wall insulation system reach the maximum at the edge of the wall while the minimum in central.

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28

Iatcheva, Ilona Ilieva, Rumena Stancheva, Hristofor Tahrilov, and Ilonka Lilianova. "Coupled Electromagnetic-Thermal Field Investigation in Induction Heating Device." Solid State Phenomena 152-153 (April 2009): 407–10. http://dx.doi.org/10.4028/www.scientific.net/ssp.152-153.407.

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The aim of the work is precise coupled –electromagnetic and temperature field analysis of an induction heating system by finite element method. Presented example is referred to real induction heating system. The problem was solved as nonlinear, transient and axisymmetrical. The numerical model of the coupled fields is based on the finite element method and electromagnetic and temperature distributions have been obtained using COMSOL 3.3 software package.

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29

Hua, Guang Ru, Hong Yu Wen, and Li Qiang An. "Thermal-Mechanical Analysis of Metal Forming Based on Meshfree Method." Materials Science Forum 575-578 (April 2008): 273–81. http://dx.doi.org/10.4028/www.scientific.net/msf.575-578.273.

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A thermal-mechanical analysis of metal forming based on meshfree method is performed. During the coupled analysis, two independent sub-systems, i.e. the velocity field and temperature field are considered. The effect of deformation on temperature field is added into the temperature solution by the vector of heat flux generated by internal energy, and the effect of temperature on plastic deformation is considered by the flow stress at that temperature. The unknown function of temperature distribution is constructed using reproducing kernel approximation. Contours of the temperature field of a metal ring under compression are obtained. Using the thermal-mechanical coupling method, the results are compared with those obtained by FEM and experiment to verify the accuracy of the proposed method.

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30

Notingher, P., S. Agnel, and A. Toureille. "Thermal step method for space charge measurements under applied dc field." IEEE Transactions on Dielectrics and Electrical Insulation 8, no. 6 (2001): 985–94. http://dx.doi.org/10.1109/94.971455.

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31

Choi, D. S., J. H. Han, N. G. Park, K. S. Kim, and C. N. Whang. "New method for thermal desorption spectroscopy using field electron emission microscopy." Review of Scientific Instruments 67, no. 7 (1996): 2573–75. http://dx.doi.org/10.1063/1.1147216.

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32

Uh, Hyung Soo. "New fabrication method of silicon field emitter arrays using thermal oxidation." Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures 13, no. 2 (1995): 456. http://dx.doi.org/10.1116/1.587970.

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33

Bomberg, M. T., Y. S. Muzychka, D. G. Stevens, and M. K. Kumaran. "A Comparative Test Method to Determine Thermal Resistance under Field Conditions." Journal of Thermal Insulation and Building Envelopes 18, no. 2 (1994): 163–81. http://dx.doi.org/10.1177/109719639401800206.

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34

Golebiowski, Jerzy, and Marek Zareba. "Method of analysis of asymmetrical thermal field in a double insulated wire." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 36, no. 4 (2017): 1075–88. http://dx.doi.org/10.1108/compel-01-2016-0038.

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Purpose The purpose of this article is investigating the impact of the spatially variable heat transfer coefficient on the thermal field in the double insulated wire. Design/methodology/approach The effect of the air boundary layer was modelled by means of changing the total heat transfer coefficient on the external perimeter of the wire. This leads to an elliptical boundary problem with Hankel’s condition dependent on the angular coordinate. The eigenfunctions of the problem were determined analytically. On the other hand, the unknown coefficients of eigenfunctions and the constants were calculated numerically by solving a respective system of algebraic equations. The steady state current rating was determined with an iterative method. Findings By means of the presented method, the thermal field distribution deprived of axial symmetry in the double insulated wire was determined. The obtained results have good physical interpretation and were verified with the finite element method (by means of NISA v. 16 software). The determined values of the steady-state current rating were compared with those calculated by means of the equivalent heat transfer coefficient method and the International Electrotechnical Commission (IEC) standard. Research limitations/implications The method is applied to analyse scalar fields in layered cylindrical structures. This could be expanded to the case of a wire of any number of insulation layers. What is more, one could also consider heat sources without axial symmetry and located within the external area. Originality/value The analytical method of determining a thermal field deprived of axial symmetry in heterogeneous cylindrical system (the wire composed of three different materials) was developed.

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35

Gheni, Mamtimin, Zhen Shi Li, Wei Cheng, Wei Bing Liu, and Lie Yu. "Study on Numerical Simulation Method of Periodic Symmetric Struts Support Coupling with Heat Flow and Solid." Key Engineering Materials 462-463 (January 2011): 985–89. http://dx.doi.org/10.4028/www.scientific.net/kem.462-463.985.

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In this paper, the fluid solid coupling method is used and the FE (Finite Element) analysis is conducted for the PSSS (Periodic Symmetric Struts Support) of the large scale GT(Gas Turbine), and the overall thermal stress and thermal deformation are obtained. From the structure feature of the gas turbine, the initial boundary conditions of the high-temperature gas flow field and thermal deformation are analyzed at first. Then the coupling relationship between fluid and solid two phases is expressed mathematically, and the thermal conductivity is considered for calculation of heat transfer process, and the overall temperature field is obtained. Finally the thermal boundary condition of PSSS is defined and the structural FE analysis is conducted. At the same time, the thermal stress field and thermal deformation field are discussed for overall PSSS structure.

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36

Ma, Yaoyao, Xiaoyu Xu, Shuai Yan, and Zhuoxiang Ren. "A Preliminary Study on the Resolution of Electro-Thermal Multi-Physics Coupling Problem Using Physics-Informed Neural Network (PINN)." Algorithms 15, no. 2 (2022): 53. http://dx.doi.org/10.3390/a15020053.

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The problem of electro-thermal coupling is widely present in the integrated circuit (IC). The accuracy and efficiency of traditional solution methods, such as the finite element method (FEM), are tightly related to the quality and density of mesh construction. Recently, PINN (physics-informed neural network) was proposed as a method for solving differential equations. This method is mesh free and generalizes the process of solving PDEs regardless of the equations’ structure. Therefore, an experiment is conducted to explore the feasibility of PINN in solving electro-thermal coupling problems, which include the electrokinetic field and steady-state thermal field. We utilize two neural networks in the form of sequential training to approximate the electric field and the thermal field, respectively. The experimental results show that PINN provides good accuracy in solving electro-thermal coupling problems.

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37

Sýkorová, Libuše, Oldřich Šuba, and Jana Knedlova. "Laser Micro-Machining and Temperature Field Simulation." Key Engineering Materials 581 (October 2013): 322–25. http://dx.doi.org/10.4028/www.scientific.net/kem.581.322.

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The parametric thermal field analyses were realized by the finite element method. The analysis was run in the software solver COSMOS/DesignSTAR thermal. The thermal module makes possible to realize cases of the thermal dependences on the material properties. Material data can be entered as a function of the temperature. The thermal and physical characteristic of the polymeric materials are changed very expressively. The output of the analysis was temperature distribution described by various colors and assigned values in the spectrogram.

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38

Ren, Jin Ke, Shou Yi Li, and Li Juan Zhao. "Research on the Superficial Thermal Insulation Calculation Method of Massive Concrete Structure." Advanced Materials Research 255-260 (May 2011): 1885–90. http://dx.doi.org/10.4028/www.scientific.net/amr.255-260.1885.

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In this paper, based on the principle of heat balance, the computing equation of temperature field which used the thermal coefficient, surface coefficient, and heat as the basic parameters of the heat conduction equation is derived, and thereafter the FEM computation procedure about temperature field named RCTS which used the thermal diffusivity as basic parameter is modified. The modified procedure can reasonably reflect the temperature field of composite construction which is made of a great variety of material with different thermal property, and also can simulate the effect of surface heat preservation at arbitrary periods and arbitrary parts of the bulk concrete structure. According to the calculation example, the similarities and differences of the heat preservation effect on the heated board calculation by using different methods: the equivalent surface coefficient method, the equivalent thickness method, the thermal conductivity method and the thermal diffusivity method are analyzed. The calculation results show that the computing results of the thermal conductivity method are closed to the result of the equivalent surface coefficient method, the results of the equivalent thickness method have certain differences but not quite because it is the approximation process of the equivalent surface coefficient method, and the reasonable result is often missed by using the thermal diffusivity method.

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39

Wang, Cheng. "A calculation method of thermal deformation for double helical gear." Mechanics & Industry 20, no. 6 (2019): 612. http://dx.doi.org/10.1051/meca/2019045.

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Thermal deformation caused by gear transmission is an important factor causing gear impact, vibration and partial load. Gear modification can effectively improve the effects caused by thermal deformation. The calculation of thermal deformation is the first problem to be solved before gear modification. This paper takes double helical gear as the research object and a calculation method of thermal deformation is proposed. Firstly, temperature of instantaneous meshing points on the tooth surface are measured and these discrete temperature values are fitted by the linear interpolation. Calculation formula of temperature distribution along gear radial direction is introduced. Combining both, tooth surface temperature field is obtained. Secondly, equation of tooth surface for double helical gear before and after thermal deformation is derived according to the tooth surface temperature field. Finally, an example is given. Compared with the given modification of thermal deformation, the calculated thermal deformation is almost equal to theoretical value. On this basis, the thermal deformation of double helical gear considering the installation error and machining error is calculated, which provides a theoretical basis for thermal deformation modification of double helical gear.

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40

Hou, Hua, and Yu Hong Zhao. "Simulation for the Fluctuation Effect on the Dendrites Growth with Phase Field Method." Materials Science Forum 704-705 (December 2011): 1338–48. http://dx.doi.org/10.4028/www.scientific.net/msf.704-705.1338.

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The dendrite growth process was simulated with the Phase Field Model coupled with the fluctuation. The effect of fluctuation intensity on the dendrite morphology and the thermal fluctuation together with the phase field fluctuation on the forming of side branches were investigated. Result shows that with the decrease of thermal fluctuation amplitude, the furcation of dendrites tip also decreased, transverse dendrites become stronger and lengthways dendrites becomes degenerate, Doublon structure disappeared, finally a quite symmetrical dendrites structure formed. Thermal fluctuation can result in the unsteadiness of dendrites side branches, it is also the main reason of forming side branches, yet phase field fluctuation has little contribution to the side branches, it is usually ignored in the calculation; when the value ofFuis appropriate, the thermal noise can lead the side branches, but cannot change the steady behavior of the dendrites’ tip.

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Yang, Xun, Ji Xin Wang, and J. C. Fan. "Simulation Study of Temperature Field and Stress Field of Disc Brake Based on Direct Coupling Method." Materials Science Forum 628-629 (August 2009): 287–92. http://dx.doi.org/10.4028/www.scientific.net/msf.628-629.287.

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In the process of automobile braking, the interaction between the temperature and the dynamic stress of disc brake is a very complex work. In order to simulate this problem accurately, a three-dimensional finite element model was built. Meanwhile the displacement and thermal boundary conditions for solution were determined, in which the coefficient of convection varies with the transient changing of temperature and time. The distributions of stress field and temperature field of the rotor and pads in an emergency braking were analyzed by the direct coupling method. The results of analysis prove that the thermal-structural direct coupling method can simulate the interaction between the stress field and the temperature field more exactly than the axisymmetric method and sequential coupling method do. The changing of stress field is mainly influenced by the temperature field. The results extracted from coupled simulation can give references for the material selection and structural designs in the development of disc brake.

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Jibrin, Sani, Mohd Maarof Moksin, Mohd Shahril Husin, Azmi Zakaria, Jumiah Hassan, and Zainal Abidin Bin Talib. "Effect of Electron Thermal Carriers on Thermal Diffusivity of Metals." Applied Mechanics and Materials 446-447 (November 2013): 219–23. http://dx.doi.org/10.4028/www.scientific.net/amm.446-447.219.

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A photoflash method of thermal diffusivity measurement was used to determine the value of thermal diffusivity of a sandwiched aluminum layer in a three-layer sample when the sample is simultaneously subjected to both thermal and electric field gradients. The value of the thermal diffusivity of the sample initially measured before electric field was applied agreed well with other reported results. The thermal diffusivity was also found to decrease or increase under the influence of the electric field strength or direction.

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Qiu, Wenkai, Keyong Wang, and Peichao Li. "Hybrid Finite Element Analysis of Heat Conduction in Orthotropic Media with Variable Thermal Conductivities." International Journal of Applied Mechanics 12, no. 09 (2020): 2050098. http://dx.doi.org/10.1142/s1758825120500982.

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A hybrid finite element method is proposed for the heat conduction analysis with variable thermal conductivities. A linear combination of fundamental solutions is employed to approximate the intra-element temperature field while standard one-dimensional shape functions are utilized to independently define the frame temperature field along the element boundary. The influence of variable thermal conductivities embeds in the intra-element temperature field via the fundamental solution. A hybrid variational functional, which involves integrals along the element boundary only, is developed to link the two assumed fields to produce the thermal stiffness equation. The advantage of the proposed method lies that the changes in the thermal conductivity are captured inside the element domain. Numerical examples demonstrate the accuracy and efficiency of the proposed method and also the insensitivity to mesh distortion.

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Wang, Jingxia, Yusheng Hu, Ming Cheng, Biao Li, and Bin Chen. "Bidirectional Coupling Model of Electromagnetic Field and Thermal Field Applied to the Thermal Analysis of the FSPM Machine." Energies 13, no. 12 (2020): 3079. http://dx.doi.org/10.3390/en13123079.

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The paper aimed to find an accurate and fast model to study the electromagnetic (EM) thermal (TH) filed coupling calculation for the TH analysis in the flux switching permanent magnet (FSPM) machine. It is extremely important to know the coupling mechanism between the EM field and TH field for the designers and users of the FSPM machines. Firstly, in order to study the EM properties of the silicon steel sheet with the temperature, the Epstein frame experiment was set up, where the effect of dc magnetic bias on the core loss is also considered. In order to save the computation time, the bidirectional coupling model based on 2D finite element (FE) EM field and 3D asymmetric minimum element TH field is established, and the steady state and transient TH fields are calculated, respectively. For the transient bidirectional coupling of EM field and TH field, a method based on the adaptive adjustment calculation step is adopted to improve the computing speed. The temperature rise experiment of the prototype was carried out to verify the accuracy of the proposed coupling model. The experimental results are in good agreement with the simulation results.

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Jing, Yong Teng, Yan Li, Longnv Li, Man Hua Jiang, and Ning Wang. "Calculation and Analysis of Temperature Rise in Transformer Tank Based on Electromagnetic-Thermal Coupling Method." Applied Mechanics and Materials 513-517 (February 2014): 3459–62. http://dx.doi.org/10.4028/www.scientific.net/amm.513-517.3459.

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Hot-spot calculation of structure parts in large power transformer has been concerned by transformer designer and researcher. The key is the calculation of leakage magnetic field, loss and temperature rise in structure parts of transformer, belongs to the calculation of the electromagnetic-thermal coupling field. This paper calculate and analysis electromagnetic field and temperature field of a transformer tank using ANSYS analysis software based on electromagnetic fields, heat transfer theory, and the results and the test data are in good agreement; aim at the problem of local overheating, appropriate magnetic shields are used to reduce the stray losses and hot-spot temperature-rise in transformer structure parts. so the calculation method can be applied engineering design.

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Qiang, Sheng, Chao Wu, Nan Nan Zhang, and Zhi Qiang Xie. "A New Measuring and Calculating Method for Concrete Thermal Conductivity with Multipoint." Advanced Materials Research 671-674 (March 2013): 1657–60. http://dx.doi.org/10.4028/www.scientific.net/amr.671-674.1657.

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The real thermal parameters always have inevitable influence on the simulation results of the structure thermal field and stress field in the construction of mass concrete. A new measuring and calculation method for concrete thermal conductivity was put forward. Eight or six sensor points measuring method and calculation formula are present, and the latter is the simplification of the former. Comparing the real thermal conductivity with the calculation result by the new method, it can be seen that the thermal conductivity can be obtained within about 6 day’s age at site and with the accurate degree of 98%. The new method will provide an efficient way for the concrete structure researcher and designer.

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He, Xiaoling. "Chaotic Behavior of a Symmetric Laminate With Transient Thermal Field." Journal of Vibration and Acoustics 128, no. 4 (2005): 429–38. http://dx.doi.org/10.1115/1.2128646.

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A symmetric isotropic laminate in a simply supported boundary condition is analyzed for its nonlinear dynamic response subjected to a nonuniform transient thermal field. The equation of motion of a modified Duffing type in a decoupled modal form is obtained for both orthotropic and isotropic symmetric laminate from the reduction of the governing equation of motion by using a Galerkin-type method. Thermally induced nonlinear response and thermal mechanically induced response are investigated in a multimode analysis. The influence of the transient thermal field is found to cause drastically different modal response from that due to the steady-state thermal field. Chaos is found being induced by the transient in-plane thermal field, or by both transient in-plane and transverse thermal fields. Unique bifurcation behavior is observed with different thermal frequencies. Different loading levels can cause transition between chaos and quasi-periodic oscillations.

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48

Yaparova, N. M., and T. P. Gavrilova. "NUMERICAL METHOD FOR DETERMINING TEMPERATURE FIELD OF A LINEAR OBJECT UNDER EXTERNAL THERMAL INFLUENCE." Journal of the Ural Federal District. Information security 20, no. 3 (2020): 49–58. http://dx.doi.org/10.14529/secur200306.

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The use of data analysis technologies for processing the temperature measurement results is aimed at solving the problems of controlling the parameters of controlling thermal modes, monitoring the thermal state of the main industrial equipment, as well as issues of integrity and availability of data circulating in automated control systems for technological processes.The article is devoted to the problem of determining non-stationary temperature fields in-side an object from the noisy results of surface temperature measurements and the parameters of external thermal effect on its surface. Mathematically, the heat transfer process is represent-ed by a parabolic equation, includes initial conditions, as well as boundary conditions formed from temperature measurements on the object’s surface and in accordance with the character-istics of the external thermal regime.

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Zyablov, Alexander Vyacheslavovich, and Sergey Valeryevich Bespalko. "Determination of nonstationary thermal field of passenger car wheel at braking." Transport of the Urals, no. 4 (2020): 40–44. http://dx.doi.org/10.20291/1815-9400-2020-4-40-44.

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The paper is devoted to modeling of nonstationary field of a passenger car wheel at braking. The calculation is based on formulation of thermal conductivity equation for the wheel tread as a curved rod with the application of linear approximation of thermal field. At formulation of thermal conductivity equation it is necessary to consider a balance of heat in small volume of tread with the consideration for thermal flow from braking shoe, thermal emission to the environment and thermal conductivity in circular direction. The authors have set for the initial equation of thermal conductivity a functional and have formulated conditions of stationarity that leads after integration to the system of the first order differential equations of time. The authors have applied the Euler method at integration. The developed method has been realized in the C++ program. With the use of this application the authors have conducted a research of the thermal field of the passenger car wheel. The method can be used at designing of new rolling stock and for the analysis of reasons of flaws appearance on the surface of car wheels.

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ALMALEH, Ahmad, Yutaka SAWAKI, and Kiyoshi ISOGIMI. "OS01W0077 Fundamental study of caustic experimental method in thermal stress analysis : Investigation for one or two dimensional stress field in circular disk." Abstracts of ATEM : International Conference on Advanced Technology in Experimental Mechanics : Asian Conference on Experimental Mechanics 2003.2 (2003): _OS01W0077. http://dx.doi.org/10.1299/jsmeatem.2003.2._os01w0077.

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