Investigation of Effects of Heater Tube Angle on the Pool Boiling Heat Transfer Coefficient

Document Type : Research Article

Authors

1 Department of Chemical Engineering, Kermanshah Branch, Islamic Azad University, Kermanshah, I.R. IRAN

2 Department of Chemical Engineering, Faculty of Engineering, Kermanshah University of Technology, Kermanshah, I.R. IRAN

3 Faculty of Petroleum and Chemical Engineering, Razi University, Kermanshah, I.R. IRAN

Abstract

In this experimental study, the effects of slope changes on the heat transfer coefficient in pool boiling in deionized water have been investigated. The experiments were carried out in the average surface roughness of 0.21 µm on a copper cylinder by changing the surface slope including 0°, 5°, 10°, 15°, 20°, 25°, and 30°. The range of heat flux was from 21 to 77 kW/m in atmospheric conditions. The results indicated that by increasing the heater slope, the departure frequency and bubble departure diameter on the heater surface were increased which lead to an increase in the mixing, turbulence, and heat transfer coefficient. Finally, the slope of 15° has reached the highest heat transfer coefficient with an increase of 20.09% compared to other slopes. Besides the optimized model was mostly overlapped with the experimental results in which Stephan Abdelsalam's model with an average error of 13.9% and the McNelly model with an average error of 24% had the minimum and maximum amount of error among the other models, respectively.

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References

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