Temperature measurements near the contact line of an evaporating meniscus V-groove
Evaporation from a meniscus of heptane liquid in a V-groove geometry is experimentally investigated. A thin layer of titanium coated on the backside of the fused quartz groove is electrically heated to provide a constant heat flux. The temperature profile in the evaporating thin film region of the extended meniscus is measured using high-resolution infrared thermography and the temperature suppression in this region is obtained as a function of liquid feeding rate. The meniscus shape is captured using a goniometer. A temperature suppression of ~0.2 K in the 150 micrometers region surrounding the contact line on each side indicates the efficacy of evaporation in the extended meniscus. At a given axial location, the fraction of total meniscus heat transfer which takes place in a 50 micrometer sub-region measured from the contact line is estimated by an approximate heat balance analysis to be ~45% for the range of liquid feeding rates explored.
Date of this Version
C. P. Migliaccio, H. K. Dhavaleswarapu and S. V. Garimella, “Temperature Measurements near the Contact Line of an Evaporating Meniscus in a V-Groove,” International Journal of Heat and Mass Transfer, Vol. 54, pp. 1520-1526, 2011
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