| Summary: | 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 .
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