开槽结构多孔芯体强化沸腾传热优化分析

Boiling heat transfer and structural optimization on surface coated by capillary porous coatings with open channels

开槽改变了多孔芯气液流动结构 ,不仅改善从核态到膜态沸腾特性 ,而且使沸腾滞后减轻 ,沸腾工况更加稳定 .为了考察开槽对沸腾传热的影响 ,根据多孔介质多相流动理论 ,建立了水平热管多孔芯体沸腾过程一维模型 ,计算了临界热负荷随开槽密度的变化 ,确定了最佳开槽密度 ,分析了开槽尺寸和多孔芯特性对开槽密度的影响 ,为实验设计提供了理论依据 .

Channels will change the flow pattern of vapor and liquid within porous coating. Vapor could escape from open channels and liquid could be sucked by porous material in which capillary plays great role. A 1 dimensional model was developed for the boiling heat transfer in the evaporators of heat pipe. It is demonstrated that open channels in porous coating can increase the critical heat flux on surface. The channel dimension and channel density will influence the characteristics of heat transfer. The optional opening density exists, which depends on the properties of the porous coating. This result can be used as guide to design the evaporators with porous coating.