肋片交错距离影响HFE-7100沸腾换热研究

Enhanced Pool Boiling Heat Transfer of HFE-7100 on Ribbed Surface

随着电子元器件发热量的持续增加,传统的风冷散热已经无法满足当前数据中心的散热和节能的双重需求,而高效的沸腾换热技术是解决目前数据中心散热瓶颈的重要手段。为了进一步提升沸腾换热性能,本文设计了交错排列的肋片表面,研究了肋片结构对工质再润湿与气泡聚并脱离行为的影响,分析了沸腾换热时气泡群的行为特征,并测试了肋片结构参数对于沸腾换热的影响。实验结果表明,肋片的交错排布强化了液相的补充能力,延缓了表面的烧干,并将临界热流密度提升至44.45 W/cm^(2),相对光滑表面提升了100.4%,当肋片间距为0.5 mm时,能够获得最佳的沸腾换热系数2.50 W/(cm^(2)·K),相对光滑表面提升了229%,本文研究结果为沸腾相变换热表面结构设计提供了指导。

As the heat generated by electronic components continues to increase,air-cooled heat dissipation can no longer meet the heat dissipation needs of current data centers,and efficient boiling heat exchange technology has begun to be applied to the heat dissipation system of data centers.In order to further enhance boiling heat transfer,this paper designed a staggered fin surface,studied the influence of the fin structure on the rewetting of the working fluid and bub-ble coalescence and detachment.This work also analyzed the behavioral characteristics of bubble groups and test the influence of fin structural parameters on boiling heat transfer.Experimental results show that the staggered arrangement of fins enhances the replenishment capacity of the liquid phase,delays the drying out of the surface,and increases the critical heat flux to 44.45 W/cm^(2),an increase of 100.4%of that of the smooth surface.When the spacing is 0.5 mm,the op-timal boiling heat transfer coefficient can be obtained at 2.50 W/(cm^(2)·K),with an improvement of 229%.The results of this study provide guidance for the design of boiling phase change heat surface structures.