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首页> 外文会议>ASME(American Society of Mechanical Engineers) International Mechanical Engineering Congress: Advanced Energy Systems Division; 20031115-20031121; Washington,DC; US >TRANSIENT THERMAL MANAGEMENT USING A CONFINED JET IMPINGEMENT OF LIQUID AMMONIA
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TRANSIENT THERMAL MANAGEMENT USING A CONFINED JET IMPINGEMENT OF LIQUID AMMONIA

机译：使用液态氨的有限射流冲击进行瞬态热管理

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摘要

This paper introduces the results of transient heat transfer involving a jet of liquid ammonia impinging perpendicularly on a solid substrate of finite thickness containing discrete electronic sources on the opposite surface. The jet was confined by using a cover plate to prevent any evaporation or loss of ammonia during the heat transfer process. The numerical simulation considered both the solid and fluid regions as a conjugate problem. The equations solved in the liquid region included the conservation of mass, conservation of energy, and conservation of momentum. For the solid region, only the heat conduction equation was solved. Computed results included the temperature distribution, local and average heat transfer coefficient, and local and average Nusselt number at the solid-fluid interface. Some of the parameters such as the jet velocity, plate thickness, and plate material were altered to examine the effect that they had on the problem. It was found that the average heat transfer coefficient and the average Nusselt number were high at the initial stages of the transient process and decreased steadily with time until it reached the steady state condition. As the plate thickness decreased, and as the jet velocity increased, it was observed that the time it took to reach the steady state condition declined. The time it took to reach steady state condition did not change significantly for different plate materials. However, it did change noticeably for different plate thickness and different Reynolds number.
机译：本文介绍了瞬态传热的结果，其中涉及垂直入射在有限厚度的固体基材上的液氨射流，该固体基材在相对的表面上包含离散的电子源。通过使用盖板限制射流，以防止在传热过程中氨气蒸发或损失。数值模拟将固体和流体区域都视为共轭问题。在液体区域中求解的方程包括质量守恒，能量守恒和动量守恒。对于固体区域，仅求解热传导方程。计算结果包括温度分布，局部和平均传热系数，以及固-液界面处的局部和平均努塞尔数。更改了某些参数，例如射流速度，板厚和板材料，以检查它们对问题的影响。结果发现，在过渡过程的初始阶段，平均传热系数和平均努塞尔数都很高，并且随着时间的推移逐渐降低，直到达到稳态为止。观察到随着板厚度的减小以及射流速度的增加，达到稳态条件所需的时间减少。对于不同的板材，达到稳态条件所需的时间没有明显变化。但是，对于不同的板厚和不同的雷诺数，它的确发生了显着变化。

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