多孔表面槽道对沸腾传热影响的实验研究

Boiling heat transfer on porous surfaces with vapor channels

报道了开槽密度和深度对R11工质在烧结多孔表面池沸腾换热影响的实验研究. 观察发现,多孔表面开槽,蒸汽从槽道逸出,液体从多孔区吸入到受热面,沸腾换热增强. 沸腾可分为液体灌注、槽道起泡和底部蒸干3个区. 对特定的多孔层,合理开槽可获得较好的换热效果.

Boiling heat transfer on porous coated surfaces with vapor channels was investigated experimentally to determine the effects of the size and density of the vapor channels on the boiling heat transfer. Observations show that bubbles escaping from the channels enhance the heat transfer. Three regimes are identified : liquid flooding, bubbling in the channel and drying out. The maximum heat transfer occurs with an optimum vapor channels density and the boiling heat transfer performance is improved if the channels are open to the bottom of the porous coating.