Experimental Validation of a Thermal Model of Counterflow MicroChannel Heat Exchangers Subjected to External Heat Flux

BOBBY MATHEW; HISHAM HEGAB

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Experimental Validation of a Thermal Model of Counterflow MicroChannel Heat Exchangers Subjected to External Heat Flux

机译：外部热流作用下逆流微通道换热器热模型的实验验证

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The effect of uniform external heat flux on the effectiveness of counterflow microchannel heat exchangers is experimentally studied in this article for validating an existing thermal model. The model validated in this study is a one-dimensional model previously developed by the same authors. The model is validated to be independent of microchannel profile, hydraulic diameter, and heat capacity ratio. For studying the effect of microchannel profile, experiments are conducted under balanced flow conditions using trapezoidal and triangular microchannels with approximately equal hydraulic diameter of 278.5 μm and 279.8 μn, respectively. The influence of hydraulic diameter on the thermal model is studied using a trapezoidal microchannel with hydraulic diameter of 231 μm and 278.5 μm. Experiments are conducted under unbalanced flow conditions, with a heat capacity ratio of 0.5, using the trapezoidal microchannel of hydraulic diameter of 278.5 μm. Deionized water is used as the fluid in all experiments. The hot and cold fluid effectiveness is studied and the theoretical predictions and experimental results are found to be in excellent agreement. Thus, the model validated in this article can be used for accurately modeling microchannel heat exchangers irrespective of the microchannel hydraulic diameter, profile, and heat capacity ratio.

机译：本文通过实验研究了均匀的外部热通量对逆流微通道换热器效率的影响，以验证现有的热模型。在这项研究中验证的模型是先前由同一作者开发的一维模型。验证该模型与微通道轮廓，水力直径和热容量比无关。为了研究微通道轮廓的影响，使用梯形和三角形微通道在平衡流条件下进行了实验，梯形和三角形微通道的水力直径分别近似为278.5μm和279.8μn。使用水力直径分别为231μm和278.5μm的梯形微通道研究了水力直径对热模型的影响。使用水力直径为278.5μm的梯形微通道，在热容量比为0.5的不平衡流动条件下进行实验。在所有实验中，将去离子水用作流体。研究了冷热流体的有效性，发现理论预测与实验结果吻合良好。因此，本文验证的模型可用于对微通道热交换器进行精确建模，而与微通道液压直径，轮廓和热容比无关。

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《Heat Transfer Engineering》 |2013年第6期|313-322|共10页
作者
BOBBY MATHEW; HISHAM HEGAB;
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作者单位

College of Engineering and Science, Louisiana Tech University, Ruston, Louisiana, USA;

Address correspondence to Professor Hisham Hegab, College of Engineering and Science, Louisiana Tech Universitv, Bogard Hall 217, Tech Box 10, Ruston, LA 71272, USA;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
原文格式 PDF
正文语种 eng
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Experimental Validation of a Thermal Model of Counterflow MicroChannel Heat Exchangers Subjected to External Heat Flux

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