Experimental investigation in pool boiling heat transfer of ammonia/water mixture and heat transfer correlations
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Date
2011
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Abstract
The nucleate pool boiling heat transfer coefficient of ammonia/water mixture was investigated on a cylindrical heated surface at low pressure of 4-8bar and at low mass fraction of 0<x<inf>NH3</inf><0.3 and at different heat flux. The effect of mass fraction, heat flux and pressure on boiling heat transfer coefficient was studied. The results indicate that the heat transfer coefficient in the mixture decreases with increase in ammonia mass fraction, increases with increase in heat flux and pressure in the investigated range. The measured heat transfer coefficient was compared with existing correlations. The experimental data were predicted with an accuracy of ±20% by the correlation of Calus&Rice, correlation of Stephan-Koorner and Inoue-Monde correlation for ammonia/water mixture in the investigated range of low ammonia mass fraction. The empirical constant of the first two correlations is modified by fitting the correlation to the present experimental data. The modified Calus&Rice correlation predicts the present experimental data with an accuracy of ±18% and the modified Stephan-Koorner correlation with an accuracy of ±16%. © 2011 Elsevier Inc.
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Keywords
Ammonia/water, Ammonia/Water mixture, Boiling heat-transfer coefficients, Correlation, Empirical constants, Experimental data, Experimental investigations, Heat transfer correlation, Heated surfaces, Low mass, Low pressures, Mass fraction, Nucleate pool boiling, Pool boiling, Pool boiling heat transfer, Prediction, Ammonia, Correlation methods, Cylinders (shapes), Heat transfer coefficients, Lakes, Mixtures, Phase transitions, Pressure effects, Heat flux
Citation
International Journal of Heat and Fluid Flow, 2011, 32, 3, pp. 719-729