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Improvement of the Pulsed Photothermal Technique for the Measurement of the Convective Heat Transfer Coefficient

Journal of Thermal Science 2010年第4期19卷 357-363页

作者： M.Rebay A.Arfaoui G.Mebarki R.Ben Maad J.Padet University of Reims GRESPI/Lab de ThermomecaniqueFaculte des SciencesB.P.103951687 ReimsFrance University of Tunis EL MANAR LETTMFaculte des Sciences2092 Manar ⅡTunisia

The present study concerns the measurement of the convective heat transfer coefficient on the solid-fluid interface by the pulsed photothermal *** non-intrusive technique is apphed for the measurement of the local heat transfer coefficients in cooling of a rectangular slab that simulates an electronic *** heat transfer coefficient is deduced from the evolution of the transient temperature induced by a sudden deposit of a luminous energy on the front face of the *** order to draw up the heat transfer cartography by a non-destructive tool, the infrared thermography has been *** inverse techniques for the identification of the heat transfer coefficient are presented *** first one is based on the assumption that heat transfer coefficient remains constant during the pulsed experiment,and the second one considered it variable in space and *** temporal and spatial evolutions are expressed as a constant heat transfer coefficient(h_0)multiplied by a function of time and space f(x,t).The function f is deduced from the resolution of the conjugated convection-conduction problem,by a control volume technique for the case of thermally thick *** results are given for different air velocities and deflection angles of the flow.

关键词： pulsed method infrared thermography convective heat transfer inverse method.

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Identification of the Discrete Element Model Parameters for Rock-Like Brittle Materials

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Computer Modeling in Engineering & Sciences 2020年第5期123卷 717-737页

作者： Rui Chen Yong Wang Ruitao Peng Shengqiang Jiang Congfang Hu Ziheng Zhao School of Mechanical Engineering Xiangtan UniversityXiangtan411105China Engineering Research Center for Complex Track Processing Technology and Equipment Xiangtan UniversityXiangtan411105China.

An inverse method.for parameters identification of discrete element model combined with experiment is *** inverse problem of parameter identification is transmitted to solve an optimization problem by minimizing the distance between the numerical calculations and experiment *** this method.the discrete element method.is employed as numerical calculator for the forward ***,the orthogonal experiment design with range analysis was used to carry out parameters sensitivity *** addition,to improve the computational efficiency,the approximate model technique is used to replace the actual computational *** intergeneration projection genetic algorithm(IP-GA)is employed as the optimization ***,the parameters of the discrete element model are *** verify the effectiveness and accuracy of the inverse results,the comparisons of shape deviation experiments with discrete element simulations are *** indicates that the effective and reliable discrete element model parameters can be quickly obtained through several sets of experimental ***,this inverse method.can be applied more widely to determine the parameters of discrete element model for other materials.

关键词： Discrete element model parameter determination rock-like materials IP-GA inverse method.

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