Journal
APPLIED THERMAL ENGINEERING
Volume 156, Issue -, Pages 541-549Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.applthermaleng.2019.04.065
Keywords
Pool boiling; Aluminum; Boehmite treatment; Critical heat flux
Funding
- International Collaborative Energy Technology R&D Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) - Ministry of Trade, Industry Energy, Korea [20178510011580]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20178510011580] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Oxidation layers that develop on an aluminum surface can cause changes in the surface wettability. When the aluminum surface is used as a heating surface, these changes result in inconsistencies in the nucleate boiling heat transfer performance and critical heat flux (CHF). Data is presented in this paper to define a Boehmite treatment, which is developed by placing the aluminum surface in boiling water for 180 min. The Boehmite treatment results in a favorable and stable oxidation layer. The layer is found to cause a reduction in the water contact angle from 55 to a sustainable range of 12-13. Successive pool boiling tests, using this aluminum surface as a horizontal flat heater, are used to demonstrate the stability of the Boehmitc layer. Comparisons are made against pool boiling results using a copper surface. The CHF for a Boehmite treated aluminum surface is 80% higher than that for a copper surface with similar surface roughness due to the highly wettable Boehmite layer on the aluminum surface. This work is performed using distilled saturated water at atmospheric pressure.
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