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首页> 外文期刊>International Journal of Heat and Mass Transfer >Measurement and modeling of single-phase and flow-boiling heat transfer in microtubes
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Measurement and modeling of single-phase and flow-boiling heat transfer in microtubes

机译：微管中单相和沸腾传热的测量和建模

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摘要

This paper presents an experimental technique and experimental results of heat transfer measurements in microtubes of 250 and 500 urn diameter. The data obtained with single-phase argon show no physical difference of heat transfer mechanisms between micro- and macrotubes. The enhancement of heat transfer compared to conventional correlations is explained with the increased influence of roughness, and modeled with a new relative roughness parameter In two-phase flow, nucleate boiling heat transfer coefficients are lower than in macrotubes. An extension of the diameter dependence in the VDI Waermeatlas correlation is proposed, and the conditions for stable flow-boiling are discussed.
机译：本文介绍了直径为250和500 um的微管中传热测量的实验技术和实验结果。用单相氩气获得的数据表明微管和大管之间的传热机理没有物理差异。与常规相关性相比，传热的增强是通过增加粗糙度的影响来进行解释的，并使用新的相对粗糙度参数进行建模。在两相流中，成核沸腾的传热系数低于大管。提出了直径依赖性在VDI Waermeatlas相关中的扩展，并讨论了稳定沸腾的条件。

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