Modification of sandblasted plate heaters using nanofluids to enhance pool boiling critical heat flux |
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| Authors: | Bao Truong Lin-wen Hu Jacopo Buongiorno Tom McKrell |
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| Affiliation: | 1. Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue Cambridge, MA 02139, USA;2. MIT Nuclear Reactor Laboratory, 138 Albany Street, Cambridge, MA 02139, USA;1. School of Engineering, University of São Paulo, Av. Prof. Luciano Gualberto, 380 - Butantã, São Paulo, SP, Brazil;2. Department of Chemical Engineering Science, Yokohama National University, 79-5 Tokiwadai, Hodogaya, Yokohama, Japan;1. Division of Mechanical System Engineering, Incheon National University, Republic of Korea;2. Division of Advanced Nuclear Engineering, POSTECH, Republic of Korea;1. Institute of Thermal Science and Power Systems, School of Energy Engineering, Zhejiang University, Hangzhou 310027, People''s Republic of China;2. State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, People''s Republic of China |
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| Abstract: | Nanofluids are colloidal dispersions of nanoparticles in homogenous base fluids. Previous studies have shown that nanofluids can increase pool boiling critical heat flux (CHF) by forming a porous deposition on the heated surface. However, questions remain whether nanoparticles can further enhance the CHF on a passively engineered heat transfer surface, such as a sandblasted metal plate. In this study, three water-based nanofluids (diamond, zinc oxide and alumina) were used to modify sandblasted stainless steel 316 plate heaters via boiling induced deposition. The pool boiling CHF of these pre-coated heaters increased by up to 35% with respect to that of the bare, sandblasted heaters. The enhancements are highest for alumina and zinc oxide nanofluids. Detailed surface characterization of these pre-coated heaters showed different surface morphology depending on the type of nanofluids used. Additionally, the deposited nanoparticles layers were found to alter the wettability of the heaters. Contact angle measurement provided quantitative data to determine possible CHF enhancement based on existing correlations. |
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