School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo, China.
PLoS One. 2024 Feb 15;19(2):e0297678. doi: 10.1371/journal.pone.0297678. eCollection 2024.
In this study, we propose a new type of small-channel plug-in, the double S turbulators, for passive heat transfer enhancement to improve the flow and heat transfer performance of the fluid in the channel. In the range of Reynolds number 254.512545.09, under constant wall temperature heating conditions, the effects of interpolated double S turbulators with different long axial radii (1mm, 1.5mm, 2mm) on the average Nusselt number, pressure drop, total thermal resistance and field synergy number in the rectangular mini-channel were studied. The simulation results show that compared with the smooth rectangular mini-channel, after interpolating double S turbulators with different long axial radii (1mm, 1.5mm, 2mm), the average Nusselt number increased by 81.74%101.74%, 71.29%94.06%, 67.16%88.48%, the total thermal resistance decreased by 45.1%50.72%, 41.72%48.74%, 40.28%47.2%, and the number of field synergies increased by 85.58%111.65%, 74.1%102.6%, 69.64%96.12%. At present, there are few studies on the boundary condition of constant wall temperature, and this paper supplements the research on this aspect. At the same time, the heat transfer performance of the rectangular mini-channel of the interpolated double S turbulators is stronger than that of the ordinary smooth rectangular mini-channel, which not only provides a new idea for the manufacture of micro heat dissipation equipment, but also improves the heat transfer performance of micro heat dissipation equipment and improves its work efficiency. According to the simulation data, the prediction formula of average Nusselt number and pressure drop was established by nonlinear regression method, which can be used to predict the flow and heat transfer characteristics of the rectangular mini-channel of the interpolated double S turbulators.
在这项研究中，我们提出了一种新型的小通道插件，即双 S 扰流片，用于被动传热增强，以改善通道内流体的流动和传热性能。在雷诺数为 254.512545.09 的范围内，在恒壁温加热条件下，研究了不同长轴向半径（1mm、1.5mm、2mm）的插入式双 S 扰流片对矩形微通道中平均努塞尔数、压降、总热阻和场协同数的影响。模拟结果表明，与光滑矩形微通道相比，插入不同长轴向半径（1mm、1.5mm、2mm）的双 S 扰流片后，平均努塞尔数增加了 81.74%101.74%、71.29%94.06%、67.16%88.48%，总热阻降低了 45.1%50.72%、41.72%48.74%、40.28%47.2%，场协同数增加了 85.58%111.65%、74.1%102.6%、69.64%96.12%。目前，关于恒壁温边界条件的研究较少，本文对此进行了补充。同时，插入式双 S 扰流片的矩形微通道的传热性能强于普通光滑矩形微通道，不仅为微散热设备的制造提供了新的思路，而且提高了微散热设备的传热性能，提高了其工作效率。根据模拟数据，采用非线性回归方法建立了平均努塞尔数和压降的预测公式，可用于预测插入式双 S 扰流片矩形微通道的流动和传热特性。
