Nanoparticle deposition effects on the minimum heat flux point and quench front speed during quenching in water-based alumina nanofluids |
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| Authors: | Hyungdae Kim Jacopo Buongiorno Lin-Wen Hu Thomas McKrell |
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| Affiliation: | 1. Department of Mechanical Engineering, Sami Shamoon College of Engineering, Beer-Sheva 84100, Israel;2. Department of Chemical Engineering, Ben-Gurion University of the Negev, P.O. Box 653, Beer-Sheva 84105, Israel;3. Department of Physics, Sami Shamoon College of Engineering, Beer-Sheva 84100, Israel;1. Department of Mechanical Engineering, Isfahan University of Technology, Isfahan 8415683111, Iran;2. School of Mechanical Engineering, Sharif University of Technology, Tehran, Iran;1. Brno University of Technology, Faculty of Mechanical Engineering, Technická 2896/2, 616 69 Brno, Czech Republic;2. School for Engineering of Matter, Transport and Energy, Arizona State University, 501 E. Tyler Mall, ECG 301, Tempe, AZ 85287 6106, United States;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;1. Cryogenics Heat Transfer Laboratory, Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL 32611-6300, USA;2. Nanostructured Interfaces Laboratory, Department of Chemical Engineering, University of Florida, Gainesville, FL 32611-6005, USA;1. Department of Mechanical Engineering, POSTECH, Pohang 790-784, Republic of Korea;2. Division of Advanced Nuclear Engineering, POSTECH, Pohang 790-784, Republic of Korea;3. Institute of Engineering Thermophysics, Chinese Academy of Science, Beijing 100190, China |
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| Abstract: | The quenching characteristics of metallic rodlets and spheres were investigated in pure water and water-based nanofluids with alumina nanoparticles of 0.1% by volume. The experiments were performed at both saturated and subcooled conditions under atmospheric pressure. The results demonstrate that while the initial quenching behavior in nanofluids is identical to that in pure water, both the minimum heat flux point temperature and quench front speed are significantly enhanced in subsequent quenching repetitions due to nanoparticle deposition. The nanoparticle effects on the quenching process were analyzed with focus on the intermittent liquid–solid contacts in the film boiling regime. It appears that the liquid–solid interaction during such short-lived contacts is more vigorous when a nanoparticle layer with improved surface wettability and roughness is present, which leads to the premature disruption of film boiling and quenching acceleration. |
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