在这项研究中,我们提出了一种新型的小通道插件,双S湍流器,被动强化传热,以改善流体在通道内的流动和传热性能。在雷诺数254.51~2545.09范围内,在恒定壁温加热条件下,不同长轴半径(1mm,1.5mm,2mm)在平均努塞尔数上,压降,研究了矩形小通道的总热阻和场协同数。仿真结果表明,与平滑矩形小信道相比,在对具有不同长轴半径(1mm,1.5mm,2mm),努塞尔平均人数增加了81.74%~101.74%,71.29%~94.06%,67.16%~88.48%,总热阻下降了45.1%~50.72%,41.72%~48.74%,40.28%~47.2%,场协同数量增加85.58%~111.65%,74.1%~102.6%,69.64%~96.12%。目前,关于恒定壁温的边界条件的研究很少,本文补充了这方面的研究。同时,内插双S湍流器矩形小通道的传热性能强于普通光滑矩形小通道,这不仅为微型散热设备的制造提供了新思路,同时也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,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,可用于预测内插双S湍流器矩形小通道的流动和传热特性。
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 254.51~2545.09, 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.