Unsteady characteristics of flow pattern and pressure drop of flow boiling in single straight microchannel under sudden heat flux increase
Unsteady characteristics of flow pattern and pressure drop of flow boiling in single straight microchannel under sudden heat flux increase
复制标题
热通量突变下单直微通道流型及流动沸腾压降的非定常特性
DOI：
10.1007/s10973-022-11641-9
复制
发表时间：
2022
影响因子：
4.4
通讯作者：
Mao N
中科院分区：
文献类型：
--
作者：
Zhuang J;Yu H;He T;Mao N
聚光式光伏电池热流密度高，散热困难，温度高，会导致电池效率降低，甚至损坏。为解决这一问题，微通道冷却因其具有更高的换热性能而受到越来越多的关注。然而，太阳辐射强度的显著变化会导致CPV电池热负荷的突变，这可能会进一步影响微通道内的流动沸腾。因此，本研究对去离子水在单个直线微通道(Dh= 400μm)中的流动特性进行了实验研究，包括热流突增条件下去离子水沸腾的压降和流型。在突增热流密度后，出现了严重的压降变化和流动沸腾不稳定特性。对影响因素的研究表明，将质量流量从411.66 kg/m−2s−1提高到720.41℃/m，并将入口温度从55℃降低到45℃，有助于减弱由于蒸汽质量较低而引起的压降波动强度。同时，利用高速摄像机观察到了不同热流密度增加时的详细流型，表明热流密度增加越大，气泡的产生和相变越快。
The high heat flux on the CPV (concentrator photovoltaic) cells may lead to heat dissipation difficulty and high temperature, which will result in the decrease in electricity efficiency or even damage of CPV cells. To tackle with this problem, microchannel cooling has attracted increasing attentions recently due to its much higher heat transfer performance. However, the significantly varying solar radiation intensity will cause the sudden variation of heat load on the CPV cells, which may further influence the flow boiling inside the microchannels. Therefore, in this study, the flow characteristics including the pressure drop and flow pattern of deionized water boiling in a single straight microchannel (DH= 400 μm) under sudden heat flux increase were experimentally investigated. The serious pressure drop variation and flow boiling instability properties after the sudden heat flux increase were observed. The study on the influential factors indicates that increasing the mass flux from 411.66 to 720.41 kg m−2s−1and lowering the inlet temperature from 55 to 45 °C helped weaken fluctuation intensity of pressure drop due to the lower vapor quality. Meanwhile, the detailed flow pattern encountering different levels of heat flux increase were observed using high speed camera, which indicates that much higher heat flux increase leaded to a more rapid bubble generating and phase change phenomenon.
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DOI：
10.1115/1.4052672
发表时间：
2022-06-01
影响因子：
3
作者：
Hoseinzadeh, Siamak;Garcia, Davide Astiaso
通讯作者：
Garcia, Davide Astiaso
瞬态热通量对聚光光伏系统直微通道沸腾流型的影响
DOI：
10.1016/j.ijheatmasstransfer.2022.122792
发表时间：
2022
期刊：
Int. J. Heat Mass Transf.
影响因子：
--
作者：
Hao Yu;Jiaojiao Zhuang;Tongling Li;Wenfei Li;Tianbiao He;Ning Mao
通讯作者：
Ning Mao
基于微通道内R134a流动沸腾的段塞流-环流转变综合判据
DOI：
10.1016/j.icheatmasstransfer.2019.03.017
发表时间：
2019
影响因子：
7
作者：
Qiao Yan;L. Jia;Z. An;Qi Peng
通讯作者：
Qi Peng
使用各种微通道散热器设计的聚光光伏电池的性能
DOI：
10.1115/es2016-59411
发表时间：
2016
期刊：
影响因子：
--
作者：
A. Radwan;Mahmoud A. Ahmed;S. Ookawara
通讯作者：
S. Ookawara