Subcooled flow boiling CHF enhancement with porous surface coatings |
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| Affiliation: | 1. Department of Mechanical & Electrical Engineering, Xiamen University, Xiamen 361005, China;2. ShenZhen Research Institute of Xiamen University, ShenZhen 518057, China;3. ABB Xiamen Low Voltage Equipment Company, 12-20 Chuangxin 3rd Road, Xiamen 361006, China;4. Key Laboratory of Surface Functional Structure Manufacturing of Guangdong High Education Institutes, School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China;1. Department of Mechanical Engineering, National Institute of Technology, Tiruchirappalli 620015, Tamil Nadu, India;2. Department of Physics, National Institute of Technology, Tiruchirappalli 620015, Tamil Nadu, India;3. School of Nano Science and Technology, National Institute of Technology, Calicut 673601, Kerala, India;1. Department of Mechanical Engineering, National Institute of Technology, Tiruchirappalli 620015, Tamil Nadu, India;2. Department of Physics, National Institute of Technology, Tiruchirappalli 620015, Tamil Nadu, India |
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| Abstract: | The effect of micro/nanoporous inside surface coated vertical tubes on CHF was determined during water flow boiling at atmospheric pressure. CHF was measured for smooth and three different coated tubes, at mass fluxes (100–300 kg/m2 s) and two inlet subcooling temperatures (50 °C and 75 °C). Greater CHF enhancement was found with microporous coatings than with nanoporous coatings. Al2O3 microporous coatings with particle size <10 μm and coatings thickness of 50 μm showed the best CHF enhancement. Maximum increase in CHF was about 25% for microporous Al2O3. A wettability test was performed to study an increase of CHF with microporous coated surfaces. |
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