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首页> 外文期刊>International Journal of Heat and Mass Transfer >Flow and heat transfer in slug flow in microchannels: Effect of bubble volume
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Flow and heat transfer in slug flow in microchannels: Effect of bubble volume

机译：微通道中团状流的流动和传热：气泡体积的影响

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Flow and heat transfer in gas-liquid slug flow in small diameter channels have been studied extensively in the last few decades because of its unique ability to segment the flow and enhance heat transfer by the internal recirculation in the liquid phase. The segmentation of the continuous liquid phase is achieved by the gas bubble of the size of the channel. While the hydrodynamics and heat transfer for long Taylor bubbles having volume more than that of a sphere that can fit in the channel has been studied extensively, very little attention has been paid to the bubbles having smaller volume but almost spanning the channel. The bubble volume can be represented by a non-dimensional equivalent sphere radius, ratio of the radius of a sphere having same volume as that of the bubble and channel radius. In this work, we study the hydrodynamics of the slug flow for a range of bubble volumes keeping all other parameters constant for non-dimensional equivalent sphere radius close to 1, between 0.72 and 1.55. The bubble shape, pressure distribution, bubble velocity and flow field in the liquid slug has been investigated. The effect of Reynolds number on the bubble shape for short as well as Taylor bubbles has also been studied. Heat transfer without phase change for constant heat flux boundary condition at the wall has been investigated and the Nusselt number is found to be highest for the non-dimensional equivalent sphere radius close to one. The heat transfer results have also been compared with a simple phenomenological model available in literature for heat transfer in slug flow. (C) 2018 Elsevier Ltd. All rights reserved.
机译：在过去的几十年中，由于小直径通道中的气液塞流中的流动和传热已经得到了广泛的研究，这是因为它具有独特的分离流动的能力，并通过液相内部的再循环提高了传热。连续液相的分段是通过通道大小的气泡实现的。尽管已经广泛研究了体积比可容纳在通道中的球体大的长泰勒气泡的流体动力学和热传递，但是对于体积较小但几乎跨过通道的气泡的关注却很少。气泡的体积可以用无量纲的等效球体半径，具有与气泡相同体积的球体的半径与通道半径之比来表示。在这项工作中，我们研究了一系列气泡体积下的弹团流动的流体动力学，对于无量纲等效球体半径，其所有其他参数在0.72和1.55之间接近1时保持不变。研究了液团中的气泡形状，压力分布，气泡速度和流场。还研究了雷诺数对短气泡以及泰勒气泡的影响。对于壁上恒定的热通量边界条件，已经研究了在没有相变的情况下的传热，并且对于接近一的无量纲等效球体半径，Nusselt数最高。传热结果也已经与文献中用于团状流传热的简单现象学模型进行了比较。 （C）2018 Elsevier Ltd.保留所有权利。

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