Pool boiling characteristics of nanofluid on flat plate based on heater surface analysis |
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| Affiliation: | 1. Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur, Malaysia;2. Chemical Engineering Department, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad, Iran;3. Mechanical Engineering Department, Arsenjan-Branch, Islamic Azad University, Fars, Iran;4. Chemistry Department, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran;1. Department of Medical and Mechatronics Engineering, Soonchunhyang University, 22 Soonchunhyang-Ro, Asan, Chungnam 31538, South Korea;2. Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongam-Ro, Nam-Gu, Pohang, Gyeongbuk 37673, South Korea;3. Department of Mechanical Engineering, Chosun University, 309 Pilmun-Daero, Dong-gu, Gwangju 61452, South Korea;1. Department of Mechanical Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran;2. Department of Mechanical Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran;1. Technical Vocational School of Higher Education, Atatürk University, Erzurum, 25240, Turkey;2. Department of Mechanical Engineering, Ataturk University, Erzurum, 25240, Turkey |
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| Abstract: | Nucleate pool boiling of Al2O3 based aqueous nanofluid on flat plate heater has been studied experimentally. For boiling of nanofluid (< 0.1 vol.%) on heating surface with ratio of average surface roughness to average diameter of particles much less than unity when boiling continue to CHF, the heat transfer coefficient of nanofluid boiling reduces while critical heat flux (CHF) increases. CHF enhancement increased with volume fraction of nanoparticles. Atomic force microscope (AFM) images from boiling surface showed that after boiling of nanofluid the surface roughness increases or decreases depending on initial condition of heater surface. Changes in boiling surface topology during different regions of boiling, wettability and thermal resistance of heater surface owing to nanoparticles deposition cause to variations in nanofluids boiling performance. |
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