Theoretical and experimental investigation of mist cooling of a heated plate
The experimental and theoretical investigation of droplet deposition from a mist turbulent two-phase flow on a flat plate with and without heat transfer from the plate and the enhanced heat-transfer by mist cooling of a heated flat plate is discussed. The rate of non-dimensional deposition velocity k{sub d}/u{asterisk} on the flat plate is related to the ratio of fluctuation velocity of droplets to that of fluid, the concentration-gradient of droplets at the edge of buffer zone, the Reynolds number and the plate temperature. This investigation was carried out under different flow conditions, droplets size, droplet concentration and plate temperature. It was found that K{sub d}/u{asterisk} is a function of Reynolds number, droplet size and the wall temperature. The theoretical model derived from k{sub d}/u{asterisk} is based on the frequency response of particle to fluid fluctuation in a dilute two-phase turbulent flow. The enhanced heat-transfer coefficient by mist cooling was studied when the wall temperature was below Leidenfrost temperature. It was found that the enhanced heat transfer coefficient is a function of mean concentration of droplet in the mist flow, the temperature of the wall and the flow condition. The heat-transfer by mist cooling was found as high as five times over forced convection heat transfer by air.
- Research Organization:
- State Univ. of New York, Stony Brook, NY (USA)
- OSTI ID:
- 5205759
- Country of Publication:
- United States
- Language:
- English
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