An experimental investigation was conducted to study the effect of relative waviness (amplitude-to-wavelength ratio) on heat transfer and pressure drop characteristics of wavy minichannel array heat sinks. Hydrodynamically fully developed flows of de-ionized (DI) water, and 0.5% and 0.8% concentrations of Al₂O₃/water nanofluid were introduced into two heat sinks, each with an array of 15 rectangular wavy minichannels of amplitude-to-wavelength ratio of 0.100 and 0.133. The minichannels had a width of 0.9 mm and a depth of 1.3 mm and were machined on a 30 × 30 mm² Aluminum substrate of 11 mm thickness. Reynolds number was varied from 700 to 2300 and a constant heat flux of 45,000 W/m² was applied. Analysis of experimental results suggests increases in both Nusselt number and pressure drop with an increase in relative waviness in the laminar and transitional flow regimes. A maximum performance factor (PF) of 2.6 is achieved for a Reynolds number of 1900 using DI water in the wavy minichannels of higher relative waviness. Temperature distributions and new Nusselt number correlations for both geometries are also presented.

进行了一项实验研究，以研究相对波纹度（振幅波长比）对波纹微通道阵列散热器的传热和压降特性的影响。水动力学完全发展的去离子 (DI) 水流和 0.5% 和 0.8% 浓度的 Al ₂ O ₃ /水纳米流体被引入两个散热器，每个散热器具有 15 个矩形波幅微通道阵列0.100 和 0.133 的比率。微型通道的宽度为 0.9 毫米，深度为 1.3 毫米，是在11 毫米厚的 30 × 30 毫米²铝基板上加工而成的。雷诺数从 700 到 2300 不等，恒定热通量为 45,000 W/m ²被应用。实验结果分析表明，随着层流和过渡流态中相对波纹度的增加，努塞尔数和压降都增加。对于 1900 的雷诺数，在具有较高相对波纹度的波纹微通道中使用去离子水可实现 2.6 的最大性能因子 ( PF )。还介绍了两种几何形状的温度分布和新的 Nusselt 数相关性。