A Correlation for the Pool Boiling Enhancement Factor from Low Finned Tubes
The present work is devoted to formulate the enhancement factor of single enhanced, integrally machined finned tube boiling pure liquids in terms of active measures related to the boiling process. A new suggested correlation for the estimation of the nucleate pool boiling heat transfer coefficient was developed. The effects of the convective term due to the phase density differences and operating pressure on the boiling process were considered to stand independently. Eleven liquids, R-11, R-12, R-22, R-113, R-114,R123, R124, 134a, n-pentane, ethanol, water, boiling on the low finned tube, at different pressure for a heat flux in the range between (10) and (50) kW/m2 were considered. The total mean absolute error of the enhancement factors was (13.3%) for the whole range of data points. It was improved to be (10.8 %) for more than (95 %) of the data points. The correlation revealed its sensitive dependency for the enhancement factor on the parameters selected for its formulation. Most of the predicted enhancement factor values fell within (± 25) %deviation from the experimental data.
