Author

Ponzel

Date of Award

12-1997

Degree Name

Master of Science

Department

Mechanical and Aerospace Engineering

Department

Mechanical and Aeronautical Engineering

First Advisor

Dr. Chris Cho

Second Advisor

Dr. Srinivas Garimella

Third Advisor

Dr. Jerry Hamelink

Access Setting

Masters Thesis-Open Access

Abstract

Water spray cooling characteristics of a solid heated surface were investigated to better understand the physical phenomenon of nucleate boiling heat transfer for full cone sprays. An experimental test loop was developed to conduct the spray cooling experiments. A uniform heat flux condition was assumed, and the liquid flow rate and nozzle orifice diameter were selected as the main variables. Two water temperatures were chosen to perform the study. Saturated water spray was utilized to measure the wall superheat temperature. Subcooled water spray was applied to investigate the effect of water spray in the single-phase regime.

Experiments conducted using the saturated water spray revealed the heat transfer rate as a function of Weber number and the superheat temperature. The surface temperature was related to the characteristic velocity. The subcooled water spray tests indicated that liquid flow rate and nozzle orifice diameter were insignificant in the single-phase regime. Furthermore, a correlation was developed in terms of Reynolds number and Prandtl number. Test results also indicated a better cooling effect during the evaporation of the liquid film above saturation temperature.

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