Integral mini-channels fabricated in the metal substrate by friction stir channeling process are different from conventional mini-channels due to irregular shape, and large surface roughness. The effect of axial wall conduction on heat transfer in such mini-channels is significant, which could limit their utilisation as cooling channels in heat transfer based applications. Hence, in this study, we present an experimental analysis of the thermo-hydraulic performance of a friction stir channel to identify the axial wall conduction effect using de-ionized water as working fluid. The thermo-hydraulic performance parameters are analysed in the range of Reynolds number of 500 to 2100. The local wall temperature distribution along the length of the mini-channel is found to be non-uniform due to the significant axial wall conduction effect. The distinct pattern of numerical heat flux distribution is used as evidence to confirm the presence of axial wall conduction effect which is implied by the local wall temperature distribution. The higher average heat transfer and flow characteristics compared to the theoretical predictions for conventional mini-channels are observed as a result of simultaneously developing flow and the presence of surface roughness.

由于不规则形状和较大的表面粗糙度，通过摩擦搅拌通道法在金属基底中制造的整体微型通道与常规微型通道不同。轴向壁传导对此类微型通道中的热传递的影响非常明显，这可能会限制它们在基于热传递的应用中用作冷却通道。因此，在这项研究中，我们对摩擦搅拌通道的热工液压性能进行了实验分析，以确定使用去离子水作为工作流体的轴向壁传导效应。在500到2100的雷诺数范围内分析了热工液压性能参数。由于显着的轴向壁传导效应，沿着微型通道长度的局部壁温分布不均匀。数值热通量分布的不同模式被用作证实存在局部壁温分布所暗示的轴向壁导热效应的证据。由于同时发展了流动和存在表面粗糙度，因此观察到与传统微型通道的理论预测相比更高的平均传热和流动特性。