レーザー吸光法による濃度差マランゴニ凝縮過程における凝縮液膜厚さの非定常測定 : 試料の消光性質と測定法の検討(熱工学,内燃機関,動力など)  [in Japanese] Unsteady Measurement of Condensate Film Thickness for Solutal Marangoni Condensation by Using Laser Absorption Method : Investigation of Extinction Property of Test Material and Measuring Method  [in Japanese]

The objective of the study is to establish the measuring method of the thin condensate thickness of liquid mixtures by using a laser light absorption method in the unsteady process of water-ethanol Marangoni dropwise condensation. First, the extinction property of test material, whose property against the infrared laser light having wavelength of 3.39 μm have not yet clarified, was measured. Next, the variations of the condensate film thickness after the sweeping of the heat transfer surface by departing drops in Marangoni dropwise condensation cycle were measured. The precision of this method was investigated on the basis of the extinction coefficient of the test material and the thickness of the liquid film measured. As a result, it was shown that the method of this study has good precision satisfactorily and was applicable to the measurement of such kinds.