New data treatment method for boiling heat transfer of R134a on the outside of tubes

In the experimental measurement of boiling heat transfer coefficients outside a tube, there would be a large variation of local heat flux along the tube. Therefore, the Wilson Plot Method might yield positive deviations in convective heat transfer coefficients inside the tube and negative deviations in boiling heat transfer coefficients outside the tube. A new method for the data treatment considering the local heat transfer coefficient variation was proposed in the present work and was applied to the data treatment of the experimental measurement of boiling heat transfer outside the mechanically manufactured enhanced heat transfer tubes and reasonable values of heat transfer coefficients on both sides of the enhanced boiling heat transfer tubes were obtained.