The Simulation of Thermocapillary Migration of a Liquid Droplet under Microgravity

• Main Authors: Yan-Lin Leu, 呂彥林
• Other Authors: Professor Yu-Min Yang
• Format: Others
• Language: zh-TW
• Published: 1994
• Online Access: http://ndltd.ncl.edu.tw/handle/53058929678363192541

碩士 === 國立成功大學 === 化學工程研究所 === 82 === In order to reduce the buoyant force , two density matched systems of aniline/water and water/n-butyl benzoate were used in this paper . By means of establishing a constant temperature gradient in the continuous phase, we studied the thermocapillary migration of a liquid droplet . Experimental results were then compared with the theoretical results of creeping flow . Under the condition of Ma = 0.44∼5.82 , when the temperature gradient was 3817K/m , the thermocapillary efficiency of the unsaturated aniline/water system was 35% , and when the temperature gradient was 4831K/m, the thermocapillary efficiency was 28% . Under the same condition , the thermocapillary efficiency of the saturated aniline/ water system was 52% when the temperature gradient was 3817K/ m . These results indicated that the mass transfer would affects the thermocapillary migration of a liquid droplet noticeably and decrease the thermocapillary efficiency . The effect of the mass transfer across the interface would more serious if the buoyant force was removed . Besides , the effect of thermal convection should also be considered . For water/n- butyl benzoate system , in the condition of Ma = 13∼162 , the thermocapillary efficiency was 19.1% . The results showed that the effect of the thermal convection would reduced the thermo- capillary efficiency drasticly .