Study on Dropwise Condensation Curves (Dropwise to Filmwise Transition of Propylene Glycol, Ethylene Glycol and Glycerol Vapors on a Copper Surface Using a Monolayer Type Promoter-Part 2)

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The measured results of dropwise condensation curves for three organic substances, propylene glycol, ethylene glycol and glycerol vapors on a trilauryl trithiophosphite adsorbed copper surface were shown in the previous report. Two different modes of drop to film transition, the continuous and jumping modes were obtained. In this report, the variations in the condensation states measured simultaneously by high speed and video cameras are shown for both transition modes. Then, the contact angles of three substances during condensation were compared. The variations in the condensing states in all cases measured were generalized and tabulated. Furthermore, the mechanisms of the transition were discussed. It was certified that the contact angle and the viscosity of the condensate were the controlling factors in the case of continuous mode transition, and the curve shape of the jumping mode was similar to the continuous one, except for an unconnected part between the jumping and film points.
一般社団法人日本機械学会の論文
1988-02-15