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Heat Transfer Research

Impact factor: 0.078

ISSN Print: 1064-2285
ISSN Online: 2162-6561

Heat Transfer Research

DOI: 10.1615/HeatTransRes.v41.i5.40
pages 531-558

Dimensionless Local and Average Boiling Heat Transfer Correlation for Saturated Liquids

Mihir K. Das
Indian Institute of Technology Bhubaneswar
Satish C. Gupta
Department of Chemical Engineering, University of Roorkee, Roorkee - 247667 India
V. K. Agarwal
Chemical Engineering Department, Indian Institute of Technology Roorkee, Roorkee - 247667

ABSTRACT

The present study is an experimental investigation on nucleate pool boiling of saturated liquids namely, distilled water, methanol, and iso-propanol over a plain copper heating tube at atmospheric and sub-atmospheric pressures. The study includes the effect of operating parameters, i.e., heat flux and pressure on the boiling heat transfer coefficient of saturated liquids on a copper heating tube. The boiling heat transfer coefficient is determined locally at the bottom, two sides and at the top position of the heating tube and a dimensionless equation of the form h*ψ/h*ψ,1= [(a+b cos ψ)/ (a+b cos ψ)1](ρ/ρ1)0.32 is established for prediction of the local boiling heat transfer coefficient at different pressures. Further, a dimensional equation, h = Cq0.7ρ0.32 , is established for determination of the average boiling heat transfer coefficient of saturated liquids on a plain copper heating tube. The dimensionless correlations of earlier investigators are tested with experimental data of the present investigation for the sake of comparison. Further, a dimensionless correlation of the form: Nu*B = Csf(Pe*B)0.7(Kp)0.7(Pr)−0.67 is proposed. The correlation is found to fit experimental data of the present investigation within a maximum error of ±6.