Flow and heat transfer enhancement in condensing water drops in steam flows

Flow and heat transfer enhancement in condensing water drops in steam flows
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蒸汽流中冷凝水滴的流动和传热增强

DOI:
10.1063/1.4865101
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发表时间:
2014-02
影响因子:
4
通讯作者:
Wu, Di
Wu, Di
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Yang, Zhen;Duan, Yuan-Yuan;Zhu, Zhao;Gong, Wei;Ma, Xiao-Chen;Chen, Ying;Wu, Di

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对0.1~1 mm水滴在蒸汽流中冷凝的内部流动和强化换热进行了实验和数值研究。实验数据与计算流体力学结果一致,表明外部蒸汽流动通过气液界面粘性剪切引起液滴内部流动。内部流动的速度只有外部流动的几个百分点,但它可以将换热提高高达117%。蒸汽流量对换热的影响随着接触角的增大或液滴尺寸的增大而增大。
Internal flow and heat transfer enhancement were experimentally and numerically investigated for 0.1- to 1-mm-sized water drops condensing in steam flows. The experimental data and computational fluid dynamics results are in agreement, showing that the external steam flow causes an internal flow in the drops via viscous shearing at the liquid-vapor interface. The velocity of the internal flow is only several percent of that of the external flow, but it enhances heat transfer by up to 117%. The effects of steam flow on heat transfer increase as the contact angle or the size of the drop increases.
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