Enhanced heat transfer through minichannel heat sink is beneficial for engineering uses such as air conditioning, cooling system, and heat retrieval processes. In the current study, the heat transfer and friction factor were experimentally measured in a rectangular minichannel heat sink with coiled wire inserts. These coiled wires exhibited two wire diameters (0.4, 0.6 mm) and three pitches (1.2, 2.4 and 3.6 mm). The air was used as the working fluid and the Reynolds number ranged from 3000 to 10,000 in the experiments. The minichannel was either fully or partially filled with coiled wires (upstream or downstream portion). Results indicated that the coiled wire inserts tended to increase heat transfer and friction factor in the channel. The Nusselt number and friction factor increased with wire diameter, but decreased with an increase in the pitch-to-diameter ratio. The partially filled design was proposed to reduce the pressure drop caused by the wire inserts. Compared to the fully filled design, the friction factors were lower and the heat transfer enhancement was still noticeable. The partially filled inserts was particularly useful for reducing pressure losses from the thicker wires. Consequently, the minichannel with partially-filled coiled wires lead to the highest thermal performance.

通过微通道散热器增强的热传递对诸如空调，冷却系统和热量回收过程之类的工程应用是有益的。在当前的研究中，在带有盘绕线插入物的矩形微型通道散热器中，通过实验测量了传热和摩擦系数。这些盘绕导线具有两个导线直径（0.4、0.6毫米）和三个间距（1.2、2.4和3.6毫米）。空气用作工作流体，雷诺数在实验中为3000到10,000。微型通道完全或部分填充了线圈绕线（上游或下游部分）。结果表明，盘绕的金属丝插入物倾向于增加通道中的热传递和摩擦系数。努塞尔数和摩擦系数随线径的增加而增加，但随着螺距直径比的增加而降低。提出了部分填充的设计，以减少由金属丝插入物引起的压降。与完全填充的设计相比，摩擦系数更低，并且传热效果仍然很明显。部分填充的插入件对于减少来自较粗钢丝的压力损失特别有用。因此，带有部分填充的绕线的小通道可实现最高的热性能。