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http://dx.doi.org/10.3795/KSME-B.2015.39.7.567

The Effect of Impact Velocity on Droplet-wall Collision Heat Transfer Above the Leidenfrost Point Temperature  

Park, Jun-seok (Dept. of Nuclear Engineering, Kyung Hee Univ.)
Kim, Hyungdae (Dept. of Nuclear Engineering, Kyung Hee Univ.)
Bae, Sung-won (Thermal-Hydraulics Safety Research Division, Korea Atomic Energy Research Institute)
Kim, Kyung Doo (Thermal-Hydraulics Safety Research Division, Korea Atomic Energy Research Institute)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.39, no.7, 2015 , pp. 567-578 More about this Journal
Abstract
Single droplet-wall collision heat transfer characteristics on a heated plate above Leidenfrost temperature were experimentally investigated considering the effects of impact velocity. The collision characteristics of the droplet impinged on the heated wall and the changes in temperature distribution were simultaneously measured using synchronized high-speed video and infrared cameras. The surface heat flux distribution was obtained by solving the three-dimensional transient heat conduction equation for the heated substrate using the measured surface temperature data as the boundary condition for the collision surface. As the normal impact velocity increased, heat transfer effectiveness increased because of an increase in the maximum spreading diameter and a decrease in the vapor film thickness between the droplet and heated wall. For We < 30, droplets stably rebounded from a heated wall without breakup. However, the droplets broke up into small droplets for We > 30. The tendency of the heat transfer to increase with increasing impact velocity was degraded by the transition from the rebounding region to the breakup region; this was resulted from the reduction in the effective heat transfer area enlargement due to the breakup phenomenon.
Keywords
Droplet Collision; Infrared Thermometry; Leidenfrost Temperature; Impact Velocity;
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Times Cited By KSCI : 1  (Citation Analysis)
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