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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Pumping criterion and dynamic measurements of an inverted U-shape heat driven pump using microchannels and miniature check valves
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Pumping criterion and dynamic measurements of an inverted U-shape heat driven pump using microchannels and miniature check valves

机译：使用微通道和微型止回阀的倒U型热力驱动泵的泵送标准和动态测量

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摘要

We demonstrated an inverted U-shape heat driven pump consisting of a microchannel heat sink, two vertical branches and two miniature check valves. A new criterion, which is governed by the fluid physical properties, the geometry effect and the heat transfer rates at various oscillating stages, was developed. The theory can explain the operating range of the applied heating power. The dynamic measurements with a high speed data acquisition system shows that periodically a full cycle can be subdivided into a short liquid suction stage, a bulk boiling and a fluid discharge stage, followed by a pressure decrease stage with both of the valves closed. The average mass flow rate is small and can be computed by the energy conservation equation. The cycle period is shortened with increasing the applied heating power. The wall temperatures of the microchannel heat sink are oscillating with small amplitudes but they are slightly higher than the saturated temperature of the working fluid by several degrees. Deionized water was selected as the working fluid. Finally a closed loop heat driven pump design incorporating the microchannel heat sink and the condenser fin heat sink is proposed. (c) 2004 Elsevier Inc. All rights reserved.
机译：我们展示了一个倒U型热驱动泵，该泵由一个微通道散热器，两个垂直分支和两个微型止回阀组成。提出了一个新的准则，该准则受流体在各个振荡阶段的物理性质，几何效应和传热速率的控制。该理论可以解释所施加的加热功率的工作范围。带有高速数据采集系统的动态测量结果表明，可以将一个完整的周期定期细分为一个短的液体吸入阶段，一个大体积沸腾阶段和一个流体排放阶段，然后是两个阀门均关闭的减压阶段。平均质量流量很小，可以通过节能方程来计算。随着施加的加热功率的增加，周期周期缩短。微通道散热器的壁温以较小的幅度振荡，但比工作流体的饱和温度略高几度。选择去离子水作为工作流体。最后，提出了一种包含微通道散热器和冷凝器翅片散热器的闭环热泵设计。 （c）2004 Elsevier Inc.保留所有权利。

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