Simultaneous Boiling Visualization and Heat Transfer Measurement of Two Adjacent Water Impinging Jets

[+] Author and Article Information
Jungho Lee

Department of Extreme Thermal Systems, Korea Institute of Machinery and Materials, Daejeon, 34103, Korea

Sang Gun Lee

School of Mechanical and Aerospace Engineering, Seoul National University, Seoul, 08826, Korea

1Corresponding author.

J. Heat Transfer 138(8), 080904 (Jul 08, 2016) (1 page) Paper No: HT-16-1245; doi: 10.1115/1.4033826 History: Received May 02, 2016; Revised May 04, 2016


The effect of jet-to-jet distance of two adjacent jets on boiling heat transfer was investigated by a simultaneous boiling visualization and heat transfer measurement. The hydrodynamics of two adjacent jets were visualized by the high-speed imaging and the 4K camera on unheated surface. The surface temperature of the hot steel plate was estimated by formulating 2-D inverse heat conduction, which was measured through the flat-plate heat flux gauge. The jet Reynolds number was fixed at Re = 17,000 and the jet-to-jet distance of two adjacent jets was set to the three different jet-to-jet distances (p/d = 10, 20 and 30). The wall jet flow interference between two adjacent impinging jets forms a vertical fountain at its boundary. The more scattered water droplets are observed from the fountain due to the higher intensity at the p/d = 10. The flow interaction becomes to reduce its momentum as increasing the p/d. The boiling visualization shows which boiling mode starts to occur and turns to be disappeared from film boiling to nucleate boiling on the hot surface. The measured surface temperature has a good agreement with the corresponding boiling visualization. The closer jet distance (lower p/d) shows the rapid temperature gradient along the interaction, which provides much higher cooling rate in a multiple jet nozzle when designing an intensive quenching device.

Copyright © 2016 by ASME
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