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Transient temperature analysis of Slab in Erdemir

Journal of Iron and Steel Research International 2008年第2期15卷 43-45页

作者： nal amdali Murat Tun Sedat Sisbot Faculty of Engineering and Architecture Abant Izzet Baysal University Engineering Faculty Yeditepe University

A transient thermal model was developed for slab furnaces in Eregli Iron and Steel Works （Erdemir） in Turkey and the model was solved using the FlexPDE computer program. This program uses the finite element method. Program codes were written to solve the temperature distribution of slabs that are put into furnace at 25 ℃ and removed at about 1 250℃. To obtain the optimum slab exit temperature variation, the necessary air temperature inside the furnace was calculated to be 1 390℃. The slab temperature versus time and the temperature variation inside the slab were depicted.

关键词： Erdemir finite element method industrial system slab slab furnace temperature analysis

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Bi-Fo time scaling method in the numerical simulation of transient conjugate heat transfer

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Propulsion and Power Research 2021年第3期10卷 209-223页

作者： Yu Shi Shuiting Ding Tian Qiu Chuankai Liu Shenghui Zhang School of Energy and Power Engineering Beihang UniversityBeijing100191China Research Institute of Aero-Engine Beihang UniversityBeijing102206China

Reliable transient thermal analysis plays a very important role in the engine safety *** conjugate heat transfer simulation is an important way of temperature *** there exists a great disparity in the time scales between solid conduction and fluid *** calculation cost of transient conjugate heat transfer analysis is very huge because of the tiny time step of computational fluid *** Bi-Fo time scaling method is proposed to improve the computational efficiency of transient conjugate heat *** the one hand,this method carries out a similar transformation on solid heat conduction,scaling the calculation time with the product of density and specific heat capacity to maintain the consistency of Fourier *** the other hand,it takes very short time for the fluid domain to recover stability after a boundary *** on the above characteristic,the flow time is directly compressed to the same as that of the solid *** is verified by Mark II vane that increasing the solid thermal diffusivity can reduce the time scale of heat *** the situation of rapidly stable flow field,scaling flow time does not affect the solid thermal boundary under corresponding dimensionless *** the application scope,the Bi-Fo time scaling method can greatly reduce the time cost of transient conjugate heat transfer simulation while maintaining the accuracy of transient temperature analysis.

关键词： Transient temperature analysis Conjugate heat transfer Similar transformation Time scaling

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HYSTERESIS LOSSES AND THERMAL analysis OF GIANT MAGNETOSTRICTIVE HIGH POWER ULTRASONIC TRANSDUCER

HYSTERESIS LOSSES AND THERMAL ANALYSIS OF GIANT MAGNETOSTRIC...

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The 2011 International Conference on Mechanical Engineering and Technology

作者： Zeng Haiquan Zeng Gengxin Zeng Jianbin Yan Ming Department of Mechanical Engineering Xiamen University of Technology School of Mechanical and Automotive Engineering South China University of Technology Shenyang University of Technology

Giant magnetostrictive high power transducers usually work under a high intensity and frequency magnetic field. Hysteresis losses and eddy current losses are very heavy. At the same time, giant magnetostrictive materials（GGM） is sensitive to temperature. Therefore heat generation and temperature distribution is very important for the transducer’s design. In this paper a high power ultrasonic transducer was designed. The magnetization behavior of GGM in the transducer was characterized by the modified Jiles Atherton hysteresis model which considers eddy current losses and anomalous losses. Model parameters were determined from the least square fit between experimental values and model values. Various losses were calculated. temperature distribution of the transducer was calculated with finite element method. Calculation results and experimental results show a good agreement.

关键词： high power ultrasonic transducer giant magnetostrictive materials(GGM) hysteresis loss finite element temperature analysis

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