Surface wettability change during pool boiling of nanofluids and its effect on critical heat flux |
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| Affiliation: | 1. Nuclear Science and Engineering Department, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139-4307, USA;2. Nuclear Reactor Laboratory, Massachusetts Institute of Technology, Cambridge, MA, USA;1. UNESP – Univ Estadual Paulista, Department of Mechanical Engineering, Av. Brazil Centro 56, 15385-000 Ilha Solteira, SP, Brazil;2. Heat Transfer Research Group, Department of Mechanical Engineering, Escola de Engenharia de São Carlos (EESC), University of São Paulo (USP), Brazil;1. Division of Mechanical System Engineering, Incheon National University, Incheon, Republic of Korea;2. Department of Mechanical Engineering, POSTECH, Pohang, Republic of Korea;3. Division of Advanced Nuclear Engineering, POSTECH, Pohang, Republic of Korea;4. Department of Mechanical Engineering, University of Michigan, Ann Arbor, USA;1. Faculty of Chemical, Petroleum and Gas Engineering, Semnan University, Semnan, Iran;2. Department of Chemical Engineering, College of Chemical Engineering, Mahshahr Branch, Islamic Azad University, Mahshahr, Iran |
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| Abstract: | The pool boiling characteristics of dilute dispersions of alumina, zirconia and silica nanoparticles in water were studied. Consistently with other nanofluid studies, it was found that a significant enhancement in critical heat flux (CHF) can be achieved at modest nanoparticle concentrations (<0.1% by volume). Buildup of a porous layer of nanoparticles on the heater surface occurred during nucleate boiling. This layer significantly improves the surface wettability, as shown by a reduction of the static contact angle on the nanofluid-boiled surfaces compared with the pure-water-boiled surfaces. A review of the prevalent CHF theories has established the nexus between CHF enhancement and surface wettability changes caused by nanoparticle deposition. This represents a first important step towards identification of a plausible mechanism for boiling CHF enhancement in nanofluids. |
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