In this investigation, the cooling characteristics of mini-channel heat sink with the water-based nano-phase change material emulsions are examined experimentally. The n-eicosane nanoparticles and the pure water are considered as the as the phase change material and base fluid, respectively. The fluid flow and convection heat transfer in the mini channel heat sink are studied at different parameter ranges: the volumetric flow rate varied from $\dot{Q}$ = 60 cm³ min⁻¹ to 600 cm³ min⁻¹, three values of the heat flux imposed on the bottom wall of the heat sinks including $q_h^{″}$ = 3.2 W cm⁻², 3.95 W cm⁻², and 4.78 W cm⁻², and the mass fraction of n-eicosane nanoparticles varied from ω_pcm = 0%–10%. The influences of these parameters on the friction factor, wall temperature, heat transfer effectiveness, Nusselt number, figure of merit, coefficient of performance, and thermal resistances are investigated. It is concluded that for the low volumetric flow rate and the heat fluxes of heat flux of 3.20 W cm⁻², 3.95 W cm⁻², and 4.78 W cm⁻², using the n-eicosane nanoparticles with larger values of mass fraction is more proper to decrease the wall temperature. For low value of heat flux, the value of the convective heat transfer effectiveness is larger than unity for most values of Reynolds number. The maximum figure of merit index of 1.098 can be achieved at the Reynolds number of 1381, the heat flux of 4.78 W cm⁻², and the mass fraction of 2%. The figure of merit index is decreased with boosting the mass fraction of n–eicosane particles. The figure of merit index is decreased about 44% with boosting the mass fraction of n–eicosane particles from 2% to 10% for the heat flux of 3.20 W cm⁻². The usage of n-eicosane nanoparticles with the concentration of 2% results in the lower thermal resistances in comparison to the case of pure water. The difference between the thermal resistances for various mass fractions of n-eicosane nanoparticles decreases as the heat flux increases.

在这项研究中，实验研究了基于水的纳米相变材料乳液的微通道散热器的冷却特性。正二十烷纳米颗粒和纯水分别被视为相变材料和基础流体。在不同的参数范围内研究了微型通道散热器中的流体流动和对流传热：体积流量从$\dot{问}$ = 60 cm ³  min ^-1至600 cm ³  min ^-1，施加在散热器底壁上的三个热通量值包括$q_H^{\text{'}\text{'}}$ = 3.2 w ^厘米^-2，3.95W¯¯厘米^-2，和4.78 w ^厘米^-2，和从变化的正二十烷纳米粒子的质量分数ω _PCM  = 0％-10％。研究了这些参数对摩擦系数，壁温，传热效率，努塞尔数，品质因数，性能系数和热阻的影响。可以得出结论，对于低体积流率和3.20 w ^厘米的热通量的热通量^-2，3.95W¯¯厘米^-2，和4.78 w ^厘米^-2因此，使用质量分数较大的正二十烷纳米颗粒更适合降低壁温。对于低的热通量，对流传热效率的值对于雷诺数的大多数值来说大于1。当雷诺数为1381，热通量为4.78 W cm ^-2且质量分数为2％时，可以实现最大品质因数指数1.098 。品质因数指数随正二十烷的质量分数增加而降低。在3.20 W cm ^-2的热通量下，随着正二十烷的质量分数从2％提高到10％，品质因数指数降低了约44％。与纯水的情况相比，使用浓度为2％的正二十烷纳米颗粒会导致较低的热阻。随着热通量的增加，正二十烷烃纳米颗粒的各种质量分数的热阻之差减小。