半导体芯片在运行过程中散发热量。芯片的工作温度影响着其内部电路性能,更重要的是,其影响着芯片的可靠性。对半导体测试,这是一个重要问题,因为如果测试系统电子器件的温度不能稳定在目标水平,那么产出将下降,可重复性将会劣化。如果...半导体芯片在运行过程中散发热量。芯片的工作温度影响着其内部电路性能,更重要的是,其影响着芯片的可靠性。对半导体测试,这是一个重要问题,因为如果测试系统电子器件的温度不能稳定在目标水平,那么产出将下降,可重复性将会劣化。如果目标温度不能保持在相对较低的水平,那么系统可靠性将明显降低。自动测试系统(ATE)采用基于空气或液体介质的冷却技术。液冷系统比风冷系统的温度稳定性要高。液冷系统的热传导效率较高,因此可以降低 ATE 的工作温度。这可以提高系统可靠性,降低测试系统运行成本,改善吞吐量,保护测试系统投资。本文阐述了温度对半导体芯片的影响,分析了液冷技术在ATE 系统中较风冷技术的各项优势。展开更多
The influence of thermal circuit parameters on a buried underground cable is investigated using an ANFIS （adaptive neuro-fuzzy inference system）. Finite element solution of the heat conduction equation is used, comb...The influence of thermal circuit parameters on a buried underground cable is investigated using an ANFIS （adaptive neuro-fuzzy inference system）. Finite element solution of the heat conduction equation is used, combined with artificial intelligence methods. The cable temperature depends on several parameters, such as the ambient temperature, the currents flowing through the conductor and the resistivity of the surrounding soil. In this paper, ANFIS is used to simulate the problem of the thermal field of underground cables under various parameters variation and climatic conditions. The developed model was trained using data generated from FEM （finite element method） for different configurations （training set） of the thermal field problem. After training, the system is tested for several scenarios, differing significantly from the training cases. It is shown that the proposed method is very time efficient and accurate in calculating the thermal fields compared to the relatively time consuming finite element method; thus ANFIS provides a potential computationally efficient and inexpensive predictive tool for more effective thermal design of underground cable systems.展开更多
Interfacial thermal conductance plays a sig- nificant role in the heat transfer efficiency of nanoscale systems. The thermal conductance across Al/SiO_2 inter- faces, which is subjected to the change in concentration ...Interfacial thermal conductance plays a sig- nificant role in the heat transfer efficiency of nanoscale systems. The thermal conductance across Al/SiO_2 inter- faces, which is subjected to the change in concentration of sandwiched Rhodamine 6G solution, is measured with time domain transient thermoreflectance technique. The thermal conductance of the interface between Al and SiO_2 logarithmically decreases with an increase in the concen- tration of the Rhodamine 6G solution. This study reveals that heat transport efficiency across an interface can be conveniently manipulated according to the demand of thermal engineering by introducing organic moleculars between both sides of the interface.展开更多
This paper proposed an analytical model which can calculate the effective thermal conductivity (ETC) of a spiral-wound Lithium-ion battery (Li-ion battery). It bases on a two-dimensional energy balance with both radia...This paper proposed an analytical model which can calculate the effective thermal conductivity (ETC) of a spiral-wound Lithium-ion battery (Li-ion battery). It bases on a two-dimensional energy balance with both radial and spiral heat transfer, as well as internal thermal contact resistance (TCR) considered simultaneously and studies the influence of winding layers and winding tension on the ETC. Results show that the analytical data are in good agreement with the numerical results. With the winding layers decreased and the winding tension enhanced, the ETC of Li-ion battery increases gradually. The radial temperature in Li-ion battery is also investigated which demonstrates a relatively higher temperature when considering the internal TCR.展开更多
The mechanism of heat transfer enhancement by liquid film on the channel walls has been investigated in laminar mixed convective flows. The temperature distribution, velocity and mass fraction distributions, and the e...The mechanism of heat transfer enhancement by liquid film on the channel walls has been investigated in laminar mixed convective flows. The temperature distribution, velocity and mass fraction distributions, and the effects of the wetted wall temperatures and the Reynolds number on the momentum,heat and mass transfer were examined in details. Results show that the liquid film can enhance heat transfer along the wetted walls by 5-10 times.展开更多
文摘半导体芯片在运行过程中散发热量。芯片的工作温度影响着其内部电路性能,更重要的是,其影响着芯片的可靠性。对半导体测试,这是一个重要问题,因为如果测试系统电子器件的温度不能稳定在目标水平,那么产出将下降,可重复性将会劣化。如果目标温度不能保持在相对较低的水平,那么系统可靠性将明显降低。自动测试系统(ATE)采用基于空气或液体介质的冷却技术。液冷系统比风冷系统的温度稳定性要高。液冷系统的热传导效率较高,因此可以降低 ATE 的工作温度。这可以提高系统可靠性,降低测试系统运行成本,改善吞吐量,保护测试系统投资。本文阐述了温度对半导体芯片的影响,分析了液冷技术在ATE 系统中较风冷技术的各项优势。
文摘The influence of thermal circuit parameters on a buried underground cable is investigated using an ANFIS （adaptive neuro-fuzzy inference system）. Finite element solution of the heat conduction equation is used, combined with artificial intelligence methods. The cable temperature depends on several parameters, such as the ambient temperature, the currents flowing through the conductor and the resistivity of the surrounding soil. In this paper, ANFIS is used to simulate the problem of the thermal field of underground cables under various parameters variation and climatic conditions. The developed model was trained using data generated from FEM （finite element method） for different configurations （training set） of the thermal field problem. After training, the system is tested for several scenarios, differing significantly from the training cases. It is shown that the proposed method is very time efficient and accurate in calculating the thermal fields compared to the relatively time consuming finite element method; thus ANFIS provides a potential computationally efficient and inexpensive predictive tool for more effective thermal design of underground cable systems.
基金This work was supported by the National Basic Research Program of China （2011CB707605）, the National Natural Science Foundation of China （51205061 and 51405418）. Natural Science Foundation of Jiangsu Province （BK2012340）, the Ph.D. Programs Foundation of Ministry of Education of China （20110092120006）, and Six Talent Peaks Project of Jiangsu Province （2013-ZBZZ-026）.
文摘Interfacial thermal conductance plays a sig- nificant role in the heat transfer efficiency of nanoscale systems. The thermal conductance across Al/SiO_2 inter- faces, which is subjected to the change in concentration of sandwiched Rhodamine 6G solution, is measured with time domain transient thermoreflectance technique. The thermal conductance of the interface between Al and SiO_2 logarithmically decreases with an increase in the concen- tration of the Rhodamine 6G solution. This study reveals that heat transport efficiency across an interface can be conveniently manipulated according to the demand of thermal engineering by introducing organic moleculars between both sides of the interface.
基金supported by National Key Basic Research Program of China (No: 2014CB239603)National Natural Science Foundation of China (Grants No 51506085)Natural Science Foundation of Jiangsu Province (Grants No BK20150742)
文摘This paper proposed an analytical model which can calculate the effective thermal conductivity (ETC) of a spiral-wound Lithium-ion battery (Li-ion battery). It bases on a two-dimensional energy balance with both radial and spiral heat transfer, as well as internal thermal contact resistance (TCR) considered simultaneously and studies the influence of winding layers and winding tension on the ETC. Results show that the analytical data are in good agreement with the numerical results. With the winding layers decreased and the winding tension enhanced, the ETC of Li-ion battery increases gradually. The radial temperature in Li-ion battery is also investigated which demonstrates a relatively higher temperature when considering the internal TCR.
文摘The mechanism of heat transfer enhancement by liquid film on the channel walls has been investigated in laminar mixed convective flows. The temperature distribution, velocity and mass fraction distributions, and the effects of the wetted wall temperatures and the Reynolds number on the momentum,heat and mass transfer were examined in details. Results show that the liquid film can enhance heat transfer along the wetted walls by 5-10 times.
