Wavy microchannels have been shown to possess improved heat transfer capabilities because of greater fluid mixing and boundary layer thinning. In this study, fluid flow and heat transfer characteristics of circular wavy microchannels with tangentially branched secondary channels, were numerically investigated. Its heat transfer and fluid flow characteristics were compared with other specific wavy microchannel geometries. Three-dimensional numerical studies were carried out in the Reynolds number range of 100–300 with uniform heat flux wall boundary condition, using Ansys Fluent commercial software. Validation of the model was done with experimental data from literature. Circular wavy microchannels, owing to constant curvature, lead to nearly constant Dean vortices strength. The tangential branched secondary channels helped in further effective fluid mixing and in reinitializing the boundary layer. These phenomena had significant effect on its heat transfer and fluid flow behavior. Circular wavy microchannels with tangentially branched secondary channels, having secondary channel width to primary channel width ratio (ω) equal to 0.25, showed higher overall performance than other designs considered in the present study. Velocity vectors, velocity and temperature contours are presented to explain the fluid flow and heat transfer characteristics. It is observed that circular wavy microchannels with tangentially branched secondary channel design (ω = 0.25) gives 39.36% higher Nusselt number with 21% increased pressure drop as compared to sinusoidal wavy microchannel design. The overall performance factor of circular wavy microchannel with tangentially branched secondary channel design (ω = 0.25) is higher in the Reynolds number range of 100–250 than all other designs considered in this study.

中文翻译：

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具有切向分支二级通道的圆形波浪微通道传热和流体流动特性的数值研究

由于更大的流体混合和边界层变薄，波状微通道已被证明具有改进的传热能力。在这项研究中，数值研究了具有切向分支二级通道的圆形波浪微通道的流体流动和传热特性。将其传热和流体流动特性与其他特定的波浪形微通道几何形状进行了比较。使用 Ansys Fluent 商业软件，在雷诺数范围为 100-300 的均匀热通量壁边界条件下进行三维数值研究。模型的验证是通过文献中的实验数据完成的。由于恒定曲率，圆形波浪微通道导致几乎恒定的迪恩涡流强度。切向分支的次级通道有助于进一步有效地混合流体和重新初始化边界层。这些现象对其传热和流体流动行为有显着影响。具有切向分支的二级通道的圆形波浪微通道，二级通道宽度与一级通道宽度比 (ω) 等于 0.25，显示出比本研究中考虑的其他设计更高的整体性能。速度矢量、速度和温度等值线用于解释流体流动和传热特性。据观察，与正弦波状微通道设计相比，具有切向分支二级通道设计 (ω = 0.25) 的圆形波状微通道的努塞尔数提高了 39.36%，压降增加了 21%。