A microchannel flow is considered and the influence of the micro-post arrays and air trapped on velocity and temperature increase of the working fluid is examined experimentally and numerically incorporating 3-D simulations. The channel bottom plate is considered to be smooth and hydrophilic, which moves with a constant velocity, while channel top wall is stationary and it has staggered arrangement of micro-post arrays with hydrophobic wetting state. An experiment is carried out to validate velocity and temperature predictions while setting simulation conditions in line with the experiments. It is found that the flow field in top channel wall vicinity is influenced by the micro-post arrays; hence, wavy flow field is generated in this region. Flow circulation in the trapped air in between the micro-post arrays influences the heat transfer rates. The Nusselt number reduces slightly with increasing pitch size of the micro-post arrays. In addition, increasing the microchannel height lowers the Nusselt number. The pressure drop between the channel inlet and exit is influenced significantly by the micro-post arrays. Increasing pitch size of the micro-post arrays reduces the pressure drop; however, further increase of the pitch size beyond 12 μm does not alter the pressure drop across the microchannel.

考虑了微通道流动，并结合了3D模拟，通过实验和数值研究了微柱阵列和捕获的空气对工作流体的速度和温度升高的影响。通道底板被认为是光滑且亲水的，其以恒定的速度移动，而通道顶壁是固定的，并且具有疏水润湿状态的微柱阵列的交错排列。进行实验以验证速度和温度预测，同时根据实验设置模拟条件。发现顶部通道壁附近的流场受微柱阵列的影响。因此，在该区域中产生了波状流场。微柱阵列之间的滞留空气中的气流循环影响传热速率。随着微柱阵列的节距尺寸的增加，Nusselt数会略有减少。此外，增加微通道高度会降低Nusselt数。通道入口和出口之间的压降受微柱阵列的影响很大。增加微柱阵列的节距尺寸可减少压降；但是，间距尺寸的进一步增加超过12μm不会改变微通道上的压降。