Mathematical modeling investigation on flow boiling and high efficiency heat dissipation of two rectangular radial microchannel heat exchangers
Mathematical modeling investigation on flow boiling and high efficiency heat dissipation of two rectangular radial microchannel heat exchangers
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DOI：
10.1016/j.ijheatmasstransfer.2022.122736
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发表时间：
2022-03-19
影响因子：
5.2
通讯作者：
Luo Xiaoyan
中科院分区：
文献类型：
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作者：
Song, Mengjie;Jiang Zhengyong;Luo Xiaoyan
为了解决高热流密度器件的散热问题，微通道内的流动沸腾换热得到了广泛的应用和研究。本文报道了两种矩形径向微通道换热器的实验研究。为了通过优化其结构参数进一步改善其换热性能，建立了两个以换热系数(HTC)为验证参数的数学模型。分析表明，对于两个矩形径向微通道换热器，无槽和有槽的平均偏差分别为3.62%和7.03%。模拟结果表明，与不开槽换热器相比，开槽换热器具有更好的换热性能。对于无槽和有槽两种微通道换热器，结构参数的调整对HTC的影响较大，最大变化分别达到32.56kW/m(2)K和70.33kW/m(2)K。在加热功率为400W、体积流量为8 L/h的条件下，无槽换热器的换热性能不能得到改善。而在相同条件下，槽式换热器的预测值提高到102.56 kW/m~2K，比实验值提高了58.69%。研究结果可为微通道换热器的结构优化设计提供参考。(C)2022爱思唯尔有限公司。保留所有权利。
To solve the heat dissipation problem of high heat flux devices, flow boiling heat transfer in microchannels is widely used and investigated. Two types of rectangular radial microchannel heat exchangers, without and with grooves, were experimentally studied and reported by us. To further improve their heat transfer performances by optimizing their structural parameters, two mathematical models are developed, with heat transfer coefficient (HTC) used as validation parameter. As analyzed, for two rectangular radial microchannel heat exchangers, without and with grooves, the average deviations are 3.62% and 7.03%, respectively. The modeling results show that, compared with the heat exchanger without grooves, the one with grooves always has better heat transfer performance. For two microchannel heat exchangers, without and with grooves, the influence of adjusting structure parameters on the HTC is obvious, and the maximum changes of HTC reaches 32.56 kW/m(2)K and 70.33 kW/m(2)K, respectively. Under a heating load of 400 W and a volume flow rate of 8 L/h, the heat transfer performance of heat exchanger without grooves could not be improved. While under the same conditions, the predicted HTC of the heat exchanger with grooves is improved to 102.56 kW/m2K, which is 58.69% higher than the experimental data. The results of this study are expected to provide references for the structural design optimization of microchannel heat exchangers. (C) 2022 Elsevier Ltd. All rights reserved.