Saturated pool boiling of FC-72 from enhanced surfaces produced by Selective Laser Melting

This paper presents the results of an experimental investigation on the saturated pool boiling heat transfer performances of microstructured surfaces fabricated by the Selective Laser Melting (SLM) technique. A plain surface and intrinsic micro-cavity and micro-fin surfaces of different configuratio...

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Main Authors: Ho, Jin Yao, Wong, Kin Keong, Leong, Kai Choong
Other Authors: School of Mechanical and Aerospace Engineering
Format: Article
Language:English
Published: 2021
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Online Access:https://hdl.handle.net/10356/146092
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1460922021-01-30T20:11:31Z Saturated pool boiling of FC-72 from enhanced surfaces produced by Selective Laser Melting Ho, Jin Yao Wong, Kin Keong Leong, Kai Choong School of Mechanical and Aerospace Engineering Singapore Centre for 3D Printing Engineering Selective Laser Melting Nucleate Pool Boiling This paper presents the results of an experimental investigation on the saturated pool boiling heat transfer performances of microstructured surfaces fabricated by the Selective Laser Melting (SLM) technique. A plain surface and intrinsic micro-cavity and micro-fin surfaces of different configurations were produced from AlSi10Mg base powder using a Gaussian distributed Yb:YAG laser and the surfaces were tested in a water-cooled thermosyphon with FC-72 as the coolant fluid. In comparison with the commercially available plain Al-6061 surface, the SLM produced surfaces show significant enhancements in heat transfer coefficients and CHF. A maximum heat transfer coefficient of 1.27 W/cm2·K and up to 70% improvement in the average heat transfer coefficient as compared to a plain Al-6061 surface was achieved with the microstructured surfaces. In addition, the highest CHF value of 47.90 W/cm2, which corresponds to 76% enhancement in CHF as compared with plain Al-6061, was similarly obtained with the microstructured surfaces. Through experimental observations, it was determined that the enhanced heat transfer performances of the SLM fabricated surfaces were due to presence of inherent surface grooves and cavities created from the laser melting process. In addition, analyses of the possible thermal transport mechanisms due to the presence of surface micro-features were also elucidated. Finally, using the Rohsenow model, a general correlation was developed to characterize the pool boiling curves of the SLM fabricated surfaces by incorporating the effects of the surface micro-features, where the predicted heat fluxes were determined to be within ±20% of the heat fluxes obtained from the experiments. In summary, the present work demonstrates the promising use of SLM in fabricating intrinsic microstructured surfaces for enhancing pool boiling heat transfer. Accepted version The authors would like to acknowledge the financial support for this project under Nanyang Technological University, Singapore’s Academic Research Fund (AcRF) Tier 1 Grant No. RG 119/14. 2021-01-26T07:30:23Z 2021-01-26T07:30:23Z 2016 Journal Article Ho, J. Y., Wong, K. K., & Leong, K. C. (2016). Saturated pool boiling of FC-72 from enhanced surfaces produced by Selective Laser Melting. International Journal of Heat and Mass Transfer, 99, 107-121. doi:10.1016/j.ijheatmasstransfer.2016.03.073 0017-9310 https://hdl.handle.net/10356/146092 10.1016/j.ijheatmasstransfer.2016.03.073 2-s2.0-84962866453 99 107 121 en International Journal of Heat and Mass Transfer © 2016 Elsevier Ltd. All rights reserved. This paper was published in International Journal of Heat and Mass Transfer and is made available with permission of Elsevier Ltd. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering
Selective Laser Melting
Nucleate Pool Boiling
spellingShingle Engineering
Selective Laser Melting
Nucleate Pool Boiling
Ho, Jin Yao
Wong, Kin Keong
Leong, Kai Choong
Saturated pool boiling of FC-72 from enhanced surfaces produced by Selective Laser Melting
description This paper presents the results of an experimental investigation on the saturated pool boiling heat transfer performances of microstructured surfaces fabricated by the Selective Laser Melting (SLM) technique. A plain surface and intrinsic micro-cavity and micro-fin surfaces of different configurations were produced from AlSi10Mg base powder using a Gaussian distributed Yb:YAG laser and the surfaces were tested in a water-cooled thermosyphon with FC-72 as the coolant fluid. In comparison with the commercially available plain Al-6061 surface, the SLM produced surfaces show significant enhancements in heat transfer coefficients and CHF. A maximum heat transfer coefficient of 1.27 W/cm2·K and up to 70% improvement in the average heat transfer coefficient as compared to a plain Al-6061 surface was achieved with the microstructured surfaces. In addition, the highest CHF value of 47.90 W/cm2, which corresponds to 76% enhancement in CHF as compared with plain Al-6061, was similarly obtained with the microstructured surfaces. Through experimental observations, it was determined that the enhanced heat transfer performances of the SLM fabricated surfaces were due to presence of inherent surface grooves and cavities created from the laser melting process. In addition, analyses of the possible thermal transport mechanisms due to the presence of surface micro-features were also elucidated. Finally, using the Rohsenow model, a general correlation was developed to characterize the pool boiling curves of the SLM fabricated surfaces by incorporating the effects of the surface micro-features, where the predicted heat fluxes were determined to be within ±20% of the heat fluxes obtained from the experiments. In summary, the present work demonstrates the promising use of SLM in fabricating intrinsic microstructured surfaces for enhancing pool boiling heat transfer.
author2 School of Mechanical and Aerospace Engineering
author_facet School of Mechanical and Aerospace Engineering
Ho, Jin Yao
Wong, Kin Keong
Leong, Kai Choong
format Article
author Ho, Jin Yao
Wong, Kin Keong
Leong, Kai Choong
author_sort Ho, Jin Yao
title Saturated pool boiling of FC-72 from enhanced surfaces produced by Selective Laser Melting
title_short Saturated pool boiling of FC-72 from enhanced surfaces produced by Selective Laser Melting
title_full Saturated pool boiling of FC-72 from enhanced surfaces produced by Selective Laser Melting
title_fullStr Saturated pool boiling of FC-72 from enhanced surfaces produced by Selective Laser Melting
title_full_unstemmed Saturated pool boiling of FC-72 from enhanced surfaces produced by Selective Laser Melting
title_sort saturated pool boiling of fc-72 from enhanced surfaces produced by selective laser melting
publishDate 2021
url https://hdl.handle.net/10356/146092
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