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首页> 外文期刊>Physics of fluids >The role of surface wettability on the heat transfer in liquid-liquid two-phase flow in a microtube
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The role of surface wettability on the heat transfer in liquid-liquid two-phase flow in a microtube

机译：表面润湿性对微管中液 - 液两相流动热传递的作用

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Liquid-liquid two-phase flow is capable of boosting heat transfer in microdevices compared to the single-phase and gas-liquid flows. A thorough investigation is performed here to characterize the heat transfer in water-oil flow in a microtube. Finite element method along with the level-set model is employed for numerical simulation. A main part of this paper is devoted to studying the effect of wettability on the heat transfer performance. Four contact angles of 0 degrees 30 degrees 150 degrees and 180 degrees are investigated, which revealed that the contact angle of 150 degrees produces the highest Nusselt number (Nu). Triple points form at this contact angle, and the slugs slide on the wall, which results in more significant wall shear and slip velocity on the wall. Based on the observed flow configuration, a novel idea is developed to use the nonuniform distribution of contact angle to augment the local Nu. It is observed that changing the wall from hydrophobic to hydrophilic will locally increase Nu around the transition point. In addition to the contact angle, the slug length, frequency of slug generation, and the film thickness around the slugs affect Nu. Three Weber numbers (We) at four contact angles are examined by varying the flow rate of the oil phase in the next part of the paper. We affects Nu by changing the frequency of slug generation and consequently its length. Finally, the effect of film thickness is scrutinized at various capillary numbers (Ca). The film thickness increases with Ca which reduces the heat removal rate. Published under license by AIP Publishing.
机译：与单相和气液流动相比，液液两相流能够升压微型微生物中的传热。这里进行彻底的研究，以表征微管中的水 - 油流中的热传递。有限元方法以及电平集模型用于数值模拟。本文的主要部分致力于研究润湿性对传热性能的影响。研究了0度为0度为30度和180度的四个接触角，这揭示了150度的接触角产生最高的NUSERET数（NU）。在这种接触角处的三重点形成，并且壁板在墙壁上滑动，从而导致墙壁上更加明显的壁剪切和滑动速度。基于观察到的流量配置，开发了一种新颖的思路来使用接触角的非均匀分布来增强本地元。观察到，将壁从疏水从疏水中改变为亲水将在过渡点周围局部增加nu。除了接触角，窗格长度，夹子的频率和粘膜周围的膜厚度会影响nu。通过改变本文的下半部分的油相的流速来检查四个接触角的三个韦伯数量（我们）。通过改变SLUI生成的频率并因此影响其长度来影响NU。最后，在各种毛细管数（CA）上仔细审查膜厚度的效果。膜厚度随CA增加，降低了散热速率。通过AIP发布在许可证下发布。

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