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实验研究了湿空气掠过普通铝箔、亲水铝箔以及浸油处理后的竖直冷表面凝结时的显热和潜热传递,结果表明:湿空气凝结速率不高时,亲水表面上的凝结液更易于铺展,质量传递性能较好,比易于成珠的普通表面传热性能好。油污的存在增加了亲水表面质量传递和热量传递的阻力,但对普通表面的影响很小;较低的凝结速率使凝结液流动复杂化,流态由重力和表面张力共同作用,因此传热和传质的类比与膜状凝结理论值相差较大;凝结液呈现不规则液滴凝结、生长以及聚合现象。
The sensible heat and latent heat transfer during the condensation of the wet air over the common aluminum foil, the hydrophilic aluminum foil and the vertical cold surface after immersing oil treatment were studied experimentally. The results show that when the condensing rate of the wet air is not high, the condensate on the hydrophilic surface Easier to spread, better quality transfer performance, easier to bead than ordinary surface heat transfer performance. The presence of oil increases resistance to mass transfer and heat transfer of hydrophilic surfaces but has little effect on normal surfaces; lower rates of coagulation complicate the flow of condensate, and flow regimes work together by gravity and surface tension, thus transferring heat And mass transfer analogy with the theoretical value of the membrane-shaped coagulation difference; condensate showing irregular droplets condensation, growth and polymerization.