Predicting Conduction Heat Flux through Macrolayer in Nucleate Pool Boiling

Mohd Danish, Mohammed K. Al Mesfer, Khursheed B. Ansari, Mudassir Hasan, Abdelfattah Amari and Babar Azeem
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Mohd Danish: Chemical Engineering Department, College of Engineering, King Khalid University, Abha 61411, Saudi Arabia
Mohammed K. Al Mesfer: Chemical Engineering Department, College of Engineering, King Khalid University, Abha 61411, Saudi Arabia
Khursheed B. Ansari: Department of Chemical Engineering, Zakir Husain College of Engineering and Technology, Aligarh Muslim University, Aligarh 202001, India
Mudassir Hasan: Chemical Engineering Department, College of Engineering, King Khalid University, Abha 61411, Saudi Arabia
Abdelfattah Amari: Chemical Engineering Department, College of Engineering, King Khalid University, Abha 61411, Saudi Arabia
Babar Azeem: Department of Chemical Engineering, The University of Faisalabad, Engineering Wing, Faisalabad 38000, Pakistan

Energies, 2021, vol. 14, issue 13, 1-13

Abstract: In the current work, the heat flux in nucleate pool boiling has been predicted using the macrolayer and latent heat evaporation model. The wall superheat (ΔT) and macrolayer thickness (δ) are the parameters considered for predicting the heat flux. The influence of operating parameters on instantaneous conduction heat flux and average heat flux across the macrolayer are investigated. A comparison of the findings of current model with Bhat’s decreasing macrolayer model revealed a close agreement under the nucleate pool boiling condition at high heat flux. It is suggested that conduction heat transfer strongly rely on macrolayer thickness and wall superheat. The wall superheat and macrolayer thickness is found to significantly contribute to conduction heat transfer. The predicted results closely agree with the findings of Bhat’s decreasing macrolayer model for higher values of wall superheat signifying the nucleate boiling. The predicted results of the proposed model and Bhat’s existing model are validated by the experimental data. The findings also endorse the claim that predominant mode of heat transfer from heater surface to boiling liquid is the conduction across the macrolayer at the significantly high heat flux region of nucleate boiling.

Keywords: heat flux; pool boiling; wall superheat; conduction (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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