Study on thermal cycle in oscillating heat pipes by numerical analysis
Study on thermal cycle in oscillating heat pipes by numerical analysis
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DOI：
10.1016/j.applthermaleng.2016.11.114
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发表时间：
2017-02-25
影响因子：
6.4
通讯作者：
Nagai, Hiroki
中科院分区：
文献类型：
--
作者：
Daimaru, Takurou;Yoshida, Shuhei;Nagai, Hiroki
本文讨论了振荡热管（OHP）内的热循环。OHP是一种利用自激振荡的两相传热装置。在过去的几十年里，已经进行了大量的研究，以了解OHP现象的物理学。然而，很少有人知道在OHP的热循环。在这项研究中，我们开发了一个一维段塞流模型，再现热和水动力现象的OHP。采用快速傅立叶变换和互相关分析对振动波形数据进行处理。对由不锈钢管壁和R134a工质组成的多分支OHP进行了数值模拟。数值计算结果揭示了OHP内压力的传播规律。此外，结果表明，蒸汽体积振荡与压力相同的频率。此外，蒸汽塞获得能量或执行取决于压力传播的方向的工作。因此，能量的传播被确定为OHP内压力传播的原因。(C)2016爱思唯尔有限公司版权所有。
This paper discusses the thermal cycle found within oscillating heat pipes (OHPs). An OHP is a two-phase heat transfer device using self-exited oscillation. Over the past few decades, a considerable number of studies have been conducted to understand the physics of OHP phenomena. However, little is known about the thermal cycle in OHPs. In this study, we developed a one-dimensional Slug flow model to reproduce thermal and hydrodynamic phenomena in OHPs. Fast Fourier transform (FFT) and cross-correlation analysis were used to process oscillation waveform data. A multi-branch OHP consisting of a stainless steel pipe wall and R134a working fluid was simulated. The numerical results tevealed pressure propagation within the OHP. Moreover, the results indicated that the vapor volume oscillated with the same frequency as the pressure. Additionally, the vapor plug obtained energy or performed work depending on the direction of pressure propagation. As a result, the propagation of energy was identified as a reason for pressure propagation within the OHP. (C) 2016 Elsevier Ltd. All rights reserved.