| Title |
Pool Boiling Heat Transfer Coefficients Upto Critical Heat flux |
| Authors |
박기정(Ki-Jung Park) ; 정동수(Dongsoo Jung) |
| Keywords |
핵 비등 ; 열전달계수 ; 임계 열유속 ; 전자 쿨링 Nucleate pool boiling ; Heat transfer coefficients ; Critical heat flux ; Electronic cooling |
| Abstract |
In this work, pool boiling heat transfer coefficients(HTCs) of 5 refrigerants of differing vapor pressure are measured on horizontal smooth square surface of 9.52 mm length. Tested refrigerants are R123, R152a, R134a, R22, and R32 and HTCs are taken from 10 kW/m2 to critical heat flux of each refrigerant. Wall and fluid temperatures are measured directly by thermocouples located underneath the test surface and by thermocouples in the liquid pool. Test results show that pool boiling HTCs of refrigerants increase as the heat flux and vapor pressure increase. This typical trend is maintained even at high heat fluxes above 200 kW/m2. Zuber’s prediction equation for critical heat flux is quite accurate showing a maximum deviation of 21% for all refrigerants tested. For all refrigerant data up to the critical heat flux, Stephan and Abdelsalam’s well known correlation underpredicted the data with an average deviation of 21.3% while Cooper’s correlation overpredicted the data with an average deviation of 14.2%. On the other hand, Gorenflo’s and Jung et al.’s correlation showed only 5.8% and 6.4% deviations respectively in the entire nucleate boiling range. |