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Flow behavior of rapid thermal oscillation inside an asymmetric micro pulsating heat exchanger

机译：非对称微脉动换热器内快速热振荡的流动特性

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Highlights•The temperature, inner pressure and visualization images are used to investigate flow phenomena of micro pulsating heat exchanger.•Oscillatory eruption mode – inner pressure variations are periodic with small oscillations of liquid/gas columns.•Circulation mode – partial and bulk circulations of liquid/gas columns are found in turns.•The circulating motion helps the heat transfer more active than the oscillatory eruption mode.AbstractThis study has investigated the rapid thermal oscillatory flow in an asymmetric micro pulsating heat exchanger (MPHE). In the design and fabrication of the MPHE, a transparent acrylic plate was attached to the stainless steel plate on which 14 parallel rectangular channels were formed. As working fluids, FC-72 and ethanol were tested. The fluid inside the micro channel moves rapidly with pulsating motions by swelling and shrinking of liquid slug/gas plug at evaporation and condensation sections. By measuring the temperature variations from start-up to steady state operation, the effective thermal conductivities were evaluated. Since the filling ratio of working fluid plays an important role in heat exchanger efficiency, the optimum filling ratio was found for each working fluid. From the flow visualization inside the MPHE filled with FC-72, two different flow modes – oscillatory eruption mode and circulation mode – occurs according to the filling ratio. The circulating motion which occurs at the optimum filling ratio, helps the heat transfer into the cooling water more active than the oscillatory eruption mode.
机译： 突出显示 • 使用温度，内部压力和可视化图像来研究微脉动热交换器的流动现象。 < / ce：list-item> • 震发模式–内部压力变化是周期性的，在液/气柱中振荡很小。 • 循环模式–依次发现液/气塔的部分和大部分循环。 • 循环运动使传热比振荡喷发模式更活跃。 摘要 本研究研究了非对称微脉动热交换器（MPHE）中的快速热振荡流。在MPHE的设计和制造中，将透明的丙烯酸板连接到不锈钢板上，在该不锈钢板上形成14个平行的矩形通道。作为工作流体，测试了FC-72和乙醇。微通道内部的流体通过在蒸发和冷凝部分的液团/气塞膨胀和收缩而以脉动运动快速移动。通过测量从启动到稳态运行的温度变化，评估了有效的热导率。由于工作流体的填充率在热交换器效率中起着重要作用，因此找到了每种工作流体的最佳填充率。从填充有FC-72的MPHE内部的流动可视化中，根据填充比率，会出现两种不同的流动模式-振荡喷发模式和循环模式。以最佳填充率发生的循环运动有助于热量比振荡喷发模式更活跃地转移到冷却水中。

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