Abstract
The present research work investigates the effect of CuO nanoparticles on the nucleate boiling heat transfer characteristics of Isobutane (R600a) refrigerant. All the pool boiling experiments are carried with both pure and nano-refrigerants of 0.01, 0.025, 0.05 and 0.1 percentage by volume. The heat flux is varied from 2 kW.m-2 to 20 kW.m-2 at a regular interval of 2 kW.m-2. The heat transfer coefficient values for the pool boiling condition of R600a refrigerant are calculated experimentally, which are less deviating from the established theoretical correlations. The added CuO nanoparticles significantly influenced the nucleate boiling heat transfer coefficient of R600a refrigerant at higher heat flux values. The experiment results reveal that the thermophoretic mobility of nanoparticles play a major role in nanofluids heat transport. In the present work, CuO nanoparticles addition in R600a is optimized and is justified based on gravity and agglomeration effect.
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Recommended by Associate Editor Ji Hwan Jeong
Venugopal Thangavel is an Associate Professor, School of Mechanical and Building Sciences, Vellore Institute of Technology Chennai. His research areas are internal combustion engines, nanofluids, modern heat transfer. He published 8 articles in reputed international journals and filed three patents.
Gobinath Natarajan is affilliated to Faculty of School of Mechanical and Building Sciences, Vellore Institute of Technology, Chennai. His research interests on heat transfer, refrigerants, Nanofluids. He patented a procedure to find the optimal nanoparticles volume to obtain better COP in refrigeration systems.
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Gobinath, N., Venugopal, T. Nucleate pool boiling heat transfer characteristics of R600a with CuO nanoparticles. J Mech Sci Technol 33, 465–473 (2019). https://doi.org/10.1007/s12206-018-1246-x
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DOI: https://doi.org/10.1007/s12206-018-1246-x