Comparison study of liquid replenishing impacts on critical heat flux and heat transfer coefficient of nucleate pool boiling on multiscale modulated porous structures |
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| Authors: | Calvin H Li T Li Paul Hodgins Chad N Hunter Andrey A Voevodin John G Jones GP Peterson |
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| Affiliation: | 1. Thermal Sciences and Materials Branch, Air Force Research Laboratory, Materials and Manufacturing Directorate, Wright-Patterson AFB, OH 45433, United States;2. Department of Mechanical, Industrial, and Manufacturing Engineering, University of Toledo, Toledo, OH 43606, United States;3. Department of Mechanical Engineering, Villanova University, Villanova, PA 19085, United States;4. The G.W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332, United States;1. School of Mechanical Engineering, Yeungnam University, Gyeongsan 712-749, Republic of Korea;2. School of Mechanical, Aerospace & Systems Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Republic of Korea;1. School of Chemical Engineering and Technology, Xi’an Jiaotong University, Xi’an 710049, China;2. State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China;1. Department of Mechanical Engineering, Erik Jonsson School of Engineering and Computer Science, The University of Texas at Dallas, 800 W. Campbell Rd., Richardson, TX 75080, USA;2. Korea Atomic Energy Research Institute (KAERI), Severe Accident & PHWR Safety Division, 989-111 Daedeok-Daero, Yuseong-Gu, Daejeon, Republic of Korea;1. Rochester Institute of Technology, Microsystems Engineering, 76 Lomb Memorial Dr., Rochester, NY 14623, USA;2. Rochester Institute of Technology, Mechanical Engineering, 76 Lomb Memorial Dr., Rochester, NY 14623, USA;1. Department of Mechanical Engineering, The University of Texas at Dallas, 800 West Campbell Road, Richardson, TX 75080, USA;2. Korea Atomic Energy Research Institute (KAERI), Severe Accident & PHWR Safety Division, 989-111 Daedeok-Daero, Yuseong-Gu, Daejeon, Korea |
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| Abstract: | The critical heat flux (CHF) and heat transfer coefficient of de-ionized (DI) water pool boiling have been experimentally studied on a plain surface, one uniform thick porous structure, two modulated porous structures and two hybrid modulated porous structures. The modulated porous structure design has a porous base of 0.55 mm thick with four 3 mm diameter porous pillars of 3.6 mm high on the top of the base. The microparticle size combinations of porous base and porous pillars are uniform 250 μm, uniform 400 μm, 250 μm for base and 400 μm for pillars, and 400 μm for base and 250 μm for pillars. Both the CHF and heat transfer coefficient are significantly improved by the modulated porous. The boiling curves for different kinds of porous structures and a plain surface are compared and analyzed. Hydrodynamic instability for the two-phase change heat transfer has been delayed by the porous pillars which dramatically enhances the CHF. The highest pool boiling heat flux occurring on the modulated porous structures has a value of 450 W/cm2, over three times of the CHF on a plain surface. Additionally, the highest heat transfer coefficient also reaches a value of 20 W/cm2 K, three times of that on a plain copper surface. The study also demonstrates that the horizontal liquid replenishing is equally important as the vertical liquid replenishing for the enhancement of heat transfer coefficient and CHF improvement in nucleate pool boiling. |
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