Краткое описание

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 = Cq^0.7ρ^0.32 , 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 = C_sf(Pe^*_B)^0.7(K_p)^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.