Numerical simulation of ethanol solution heat transfer in rectangular microchannels
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摘要: 由于影响微槽传热特性的因素较多,实验研究结果相互矛盾,使得实验研究和数值仿真相结合成为进一步深入认识微槽传热特性的有效手段.在实验研究的基础上,采用有限体积法对矩形微槽中体积浓度30％的乙醇水溶液传热特性进行了三维数值模拟. 矩形微槽采用两种不同对称结构和热边界条件,进口采用流动完全发展边界条件.对不同对称结构和物性条件(常物性和变物性)的计算结果进行了比较,并与实验结果进行了对比.研究表明,对所研究微槽结构和工质,采用流动完全发展进口条件,以及随温度变化的热物性参数,数值计算结果与实验结果基本吻合.Abstract: Owing to the factors influencing microchannel heat transfer behavior are complicated, the experimental results were contrary each other. The combination of experiment and numerical simulation has become a valid method to get deep understood of the heat transfer characteristics. On the basis of experimental research, heat transfer characteristic of 30% (volume concentration) ethanol solution in rectangle microchannels was numerically simulated. Two different symmetry structures and thermal boundary conditions of microchannels were used. The fully developed boundary conditions were adopted for the inlet fluid boundary. The results of two different symmetry structures with constant fluid thermal property and that changed with temperature were compared. The results were compared with experimental results as well. It shows that simulation and experimental results are fit well to the microchannels and the work fluid used here with fully developed flow inlet condition and thermal property changed with temperature.
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Key words:
- microchannels /
- computer simulation /
- finite volume method /
- heat transfer
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