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首页> 外文期刊>International Journal of Heat and Mass Transfer >Heat transfer characteristics of alternating discrete flow in micro-tubes
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Heat transfer characteristics of alternating discrete flow in micro-tubes

机译：微管中交替离散流的传热特性

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摘要

In this paper, the heat transfer performance of the alternating discrete two phase flow in micro-tubes has been numerically investigated. Two immiscible fluids are injected into a micro-tube alternately, generating a plug flow pattern with two completely separated phases. The overall Nusselt number could be increased by sixfold over the single phase fully developed flow when the ratio of primary phase to the tube inner diameter (L_1/D) is kept at about 7. Characteristic of the average Nusselt number is found to be almost independent of the secondary phase. The friction factor is much dependent on the viscosity of the secondary phase. Secondary phase with higher viscosity would induce higher pressure loss and large pressure fluctuation is observed at regions close to the interfaces. The flow field that is far from the interfaces could be approximated as the single phase fully developed flow. Weber number of the primary phase and Capillary number of the secondary phase should be kept below certain critical values in order to maintain the discrete flow patterns. Frictional loss is a more important consideration than the heat capacity when choosing a particular secondary phase. Secondary phase with lower viscosity is preferred due to the overall heat transfer enhancement will become less beneficial if the pressure loss induced by the secondary phase becomes significant. Liquid-gas discrete flow is found to have better heat transfer performance than the liquid-liquid discrete flow.
机译：本文对微管中交替的离散两相流的传热性能进行了数值研究。两种不混溶的流体交替注入微管中，产生具有两个完全分离相的活塞流模式。当初级相与管内径之比（L_1 / D）保持在约7时，总的Nusselt数可以比单相完全展开的流量增加六倍。发现平均Nusselt数的特性几乎是独立的第二阶段。摩擦系数很大程度上取决于第二相的粘度。具有较高粘度的第二相将引起较高的压力损失，并且在靠近界面的区域观察到较大的压力波动。远离界面的流场可以近似为单相完全展开的流。第一相的韦伯数和第二相的毛细管数应保持在一定的临界值以下，以保持离散的流型。选择特定的次级相时，摩擦损失比热容更为重要。具有较低粘度的次级相是优选的，因为如果由次级相引起的压力损失变得显着，则总体的传热增强将变得不利。发现液-气离散流比液-液离散流具有更好的传热性能。

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  • 来源
  • 作者

    Yau Shiang Lim; Simon Ching Man Yu; Jorg Uwe Schluter;

  • 作者单位

    Thermal & Fluid Research Laboratory, School of Mechanical & Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore;

    Singapore Institute of Technology, EFG Bank Building, 25 North Bridge Road, Singapore 179104, Singapore;

    Division of Aerospace Engineering, School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Numerical simulation; Two phase flow; Heat transfer; Micro-channel;

    机译：数值模拟两相流;传播热量;微信;

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