Computational results are presented that describe thermo-hydrodynamic behaviour of wavy microchannels of various geometric configurations. The configurations have been obtained by changing the geometric parameters such as relative waviness and aspect ratio for a constant hydraulic diameter of 400 μm. A 3D, steady, laminar conjugate model is developed and validated against available experimental data. Fluid flow and heat transfer characteristics have been studied for distinct configurations and is found that the thermo-hydrodynamic behaviour of fluid flow strongly depends on relative waviness and aspect ratio. The increased heat transfer and pressure drop are due to the occurrence of vortices that develop within the channel. Variation of local Nusselt number has been analysed and found to follow similar trend for different aspect ratios. A performance parameter known as channel effectiveness, has been used to analyse the combined effect of heat transfer and pressure drop. It is found that there is an optimum relative waviness for wavy channels which gives maximum performance especially for channels with low aspect ratios.

中文翻译：

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矩形截面波形微通道的数值研究

计算结果描述了各种几何构型的波浪微通道的热流体力学行为。通过改变几何参数（例如 400 μm 的恒定水力直径的相对波纹度和纵横比）获得了这些配置。开发了一个 3D、稳定的层流共轭模型，并根据可用的实验数据进行了验证。已经针对不同的配置研究了流体流动和传热特性，并且发现流体流动的热流体力学行为强烈依赖于相对波纹度和纵横比。增加的传热和压降是由于在通道内产生涡流。局部努塞尔数的变化已被分析并发现对于不同的纵横比遵循类似的趋势。称为通道效率的性能参数已用于分析传热和压降的综合影响。发现波浪形通道有一个最佳的相对波纹度，这提供了最大的性能，特别是对于具有低纵横比的通道。