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首页> 外文期刊>International Journal of Heat and Mass Transfer >2D transient natural convection in diode cavities containing an electronic equipment with discrete active bands under constant heat flux
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2D transient natural convection in diode cavities containing an electronic equipment with discrete active bands under constant heat flux

机译：二极管腔中的二维瞬态自然对流，其中包含具有恒定热通量的离散有源带的电子设备

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The thermal behavior of airborne electronic equipment submitted to natural convection in closed parallelogrammic air-filled cavities is examined in this study. The cold active wall of the enclosure is maintained isothermal. The hot wall, representing the electronic device, is composed of three parallel discrete bands generating a constant heat flux, separated by two adiabatic bands of equal dimensions. Both walls remain always vertical. The channel is considered adiabatic and the aspect ratio of the cavity is equal to unity. Many configurations are examined while varying the inclination angle of the top and bottom walls of the channel. When the angle is positive the convective heat transfer is favored in comparison with the case of the right cavity, but, on the contrary, it is reduced for negative angles. The resultant enclosures are so called diode cavities in the convective heat transfer sense of the word. The experimental part of the study is achieved with a setup based on electrical data and temperature measurements on the walls. The numerical approach using the finite volume method allows to complete the experimental results with the thermal and dynamical characteristics of the 2D flow. The temperature fields show the thermal behavior of the device during the transient phase after switching it on. The convective results concerning the imposed heat flux treated in this study differ from those corresponding to impose the temperature on the hot bands. The distribution and evolution of the Nusselt number allow to characterize the natural convection occurring in the cavity. The results of this work are consistent with previous studies and allow to predict the thermal behavior of the electronic equipment during the transient phase.
机译：在这项研究中，研究了封闭的平行四边形充气腔中自然对流的机载电子设备的热行为。外壳的冷活动壁保持恒温。代表电子设备的热壁由三个平行的离散带组成，它们产生恒定的热通量，并由两个相等尺寸的绝热带隔开。两堵墙始终保持垂直。该通道被认为是绝热的，腔体的纵横比等于1。在改变通道的顶壁和底壁的倾斜角度的同时，检查了许多构造。当角度为正时，与右腔的情况相比，有利于对流传热，但相反，当角度为负时，对流传热降低。在这个词的对流传热意义上，所得的外壳被称为二极管腔。该研究的实验部分是通过基于墙壁上的电数据和温度测量值的设置完成的。使用有限体积法的数值方法可以利用二维流的热学和动力学特性完成实验结果。温度场显示了设备开机后在过渡阶段的热行为。在这项研究中，关于强加的热通量的对流结果不同于将温度强加于热带的对流结果。 Nusselt数的分布和演化可以表征腔中发生的自然对流。这项工作的结果与以前的研究一致，可以预测瞬态阶段电子设备的热行为。

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