Enhancement of pool boiling critical heat flux in dielectric liquids by microporous coatings |
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| Affiliation: | 1. GE Global Research Center, Thermal Systems Laboratory, Niskayuna, NY 12309, United States;2. University of Maryland, Department of Mechanical Engineering, College Park, MD 20742, United States;3. University of Texas at Arlington, Department of Mechanical and Aerospace Engineering, Box 19023, Arlington, TX 76019-0023, United States;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. Department of Chemical Engineering Science, Graduate School of Engineering, Yokohama National University, 79-5, Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan;2. School of Mechanical Engineering, Tianjin University, No. 135 Yaguan Road, Tianjin Haihe Education Park, Tianjin 300354, China;3. Key Laboratory of Efficient Utilization of Low and Medium Grade Energy (Tianjin University), Ministry of Education of China, Tianjin University, China;1. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, PR China;2. The Beijing Key Laboratory of Multiphase Flow and Heat Transfer, North China Electric Power University, Beijing 102206, PR China;3. The Beijing Key Laboratory of Energy Safety and Clean Utilization, North China Electric Power University, Beijing 102206, PR China;1. School of Mechanical Engineering, Korea University, Seoul 02841, Republic of Korea;2. Petrochem. Research Chair, Dept. of Chem., King Saud Univ., Riyadh 11451, Saudi Arabia;3. LG Electronics Inc., Seoul, Republic of Korea |
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| Abstract: | An experimental investigation into the effects of pressure and subcooling on the pool boiling critical heat flux from a bare silicon chip-like heater and from a silicon heater coated with microporous layers, is reported. The dual inline heater package was immersed in FC-72, a dielectric fluid, and the experiments were performed in the horizontal orientation, with subcooling varying between 0 K and 72 K, and the pressure between 101.3 kPa and 303.9 kPa. The maximum CHF values on the diamond-base microporous-coated silicon heater were found to reach 47 W/cm2, at 3 atm and nearly 50 K of subcooling, and to provide an average enhancement of approximately 60% over the values attained with un-treated silicon surfaces. An available CHF correlation, with a reported standard deviation of 12.5% for un-treated surfaces over a large range of pressures, subcoolings, and surface conditions, was shown to predict the pressure and subcooling effects on CHF from the surface-enhanced chip with a standard deviation of 12%. |
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