Experimental study on heat transfer enhancement using combined surface roughening and macro-structures in a confined double-nozzle spray cooling system
An experimental study is conducted to characterize the effects of surface roughness and the combined effects of surface roughening and macro-structure topology on the spray cooling heat transfer. It was found that the spray cooling thermal performances increase as the surface roughness increases. Fr...
| Main Authors: | , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
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2022
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/162145 |
| _version_ | 1826126579007225856 |
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| author | Liu, Pengfei Kandasamy, Ranjith Ho, Jin Yao Xie, Jinlong Wong, Teck Neng |
| author2 | School of Mechanical and Aerospace Engineering |
| author_facet | School of Mechanical and Aerospace Engineering Liu, Pengfei Kandasamy, Ranjith Ho, Jin Yao Xie, Jinlong Wong, Teck Neng |
| author_sort | Liu, Pengfei |
| collection | NTU |
| description | An experimental study is conducted to characterize the effects of surface roughness and the combined effects of surface roughening and macro-structure topology on the spray cooling heat transfer. It was found that the spray cooling thermal performances increase as the surface roughness increases. From the experimental results, a power law relationship is established between the heat flux and the magnitude of normalized roughness. On this basis, an empirical correlation is developed for spray cooling heat transfer on structured flat surfaces with varying roughness. The correlation is found to have an accuracy of 15%. In addition, the experimental results on the straight finned surfaces are compared with a region-based model with the surface roughness effect incorporated in the developed empirical correlation. The analysis reveals a decoupling relationship between the micro-roughness and macro-structure enhancing mechanisms. Furthermore, a decoupling analysis suggests that the micro-roughness enhancement and the macro-structure enhancement dominate the 0.5 mm pin finned surface and the 1.0 mm pin finned surface, respectively. However, the two types of enhancing mechanisms have a comparable contribution to spray cooling heat transfer enhancement on the straight finned surfaces. In general, spray cooling heat transfer can be enhanced by around 116% by increasing surface micro-roughness whereas heat transfer enhancement can reach as high as 136% and 288% on the surfaces with macro straight fin and pin fin structures containing micro-roughness, respectively. |
| first_indexed | 2024-10-01T06:54:56Z |
| format | Journal Article |
| id | ntu-10356/162145 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T06:54:56Z |
| publishDate | 2022 |
| record_format | dspace |
| spelling | ntu-10356/1621452022-10-05T07:28:08Z Experimental study on heat transfer enhancement using combined surface roughening and macro-structures in a confined double-nozzle spray cooling system Liu, Pengfei Kandasamy, Ranjith Ho, Jin Yao Xie, Jinlong Wong, Teck Neng School of Mechanical and Aerospace Engineering Engineering::Mechanical engineering Spray Cooling Surface Roughness An experimental study is conducted to characterize the effects of surface roughness and the combined effects of surface roughening and macro-structure topology on the spray cooling heat transfer. It was found that the spray cooling thermal performances increase as the surface roughness increases. From the experimental results, a power law relationship is established between the heat flux and the magnitude of normalized roughness. On this basis, an empirical correlation is developed for spray cooling heat transfer on structured flat surfaces with varying roughness. The correlation is found to have an accuracy of 15%. In addition, the experimental results on the straight finned surfaces are compared with a region-based model with the surface roughness effect incorporated in the developed empirical correlation. The analysis reveals a decoupling relationship between the micro-roughness and macro-structure enhancing mechanisms. Furthermore, a decoupling analysis suggests that the micro-roughness enhancement and the macro-structure enhancement dominate the 0.5 mm pin finned surface and the 1.0 mm pin finned surface, respectively. However, the two types of enhancing mechanisms have a comparable contribution to spray cooling heat transfer enhancement on the straight finned surfaces. In general, spray cooling heat transfer can be enhanced by around 116% by increasing surface micro-roughness whereas heat transfer enhancement can reach as high as 136% and 288% on the surfaces with macro straight fin and pin fin structures containing micro-roughness, respectively. Ministry of Education (MOE) Nanyang Technological University National Research Foundation (NRF) This research is supported by National Research Foundation (NRF), Singapore, under its Green Data Centre Research Programme (NRF2015ENC-GDCR01001-010). J.Y. Ho would like to acknowledge the financial support for his research appointment at the University of Illinois at Urbana-Champaign, USA under the College of Engineering (CoE) International Postdoctoral Fellowship Scholarship (IPS) provided jointly by the Ministry of Education, Singapore and Nanyang Technological University, Singapore. 2022-10-05T07:28:07Z 2022-10-05T07:28:07Z 2022 Journal Article Liu, P., Kandasamy, R., Ho, J. Y., Xie, J. & Wong, T. N. (2022). Experimental study on heat transfer enhancement using combined surface roughening and macro-structures in a confined double-nozzle spray cooling system. Applied Thermal Engineering, 202, 117850-. https://dx.doi.org/10.1016/j.applthermaleng.2021.117850 1359-4311 https://hdl.handle.net/10356/162145 10.1016/j.applthermaleng.2021.117850 2-s2.0-85120324920 202 117850 en NRF2015ENC-GDCR01001-010 Applied Thermal Engineering © 2021 Elsevier Ltd. All rights reserved. |
| spellingShingle | Engineering::Mechanical engineering Spray Cooling Surface Roughness Liu, Pengfei Kandasamy, Ranjith Ho, Jin Yao Xie, Jinlong Wong, Teck Neng Experimental study on heat transfer enhancement using combined surface roughening and macro-structures in a confined double-nozzle spray cooling system |
| title | Experimental study on heat transfer enhancement using combined surface roughening and macro-structures in a confined double-nozzle spray cooling system |
| title_full | Experimental study on heat transfer enhancement using combined surface roughening and macro-structures in a confined double-nozzle spray cooling system |
| title_fullStr | Experimental study on heat transfer enhancement using combined surface roughening and macro-structures in a confined double-nozzle spray cooling system |
| title_full_unstemmed | Experimental study on heat transfer enhancement using combined surface roughening and macro-structures in a confined double-nozzle spray cooling system |
| title_short | Experimental study on heat transfer enhancement using combined surface roughening and macro-structures in a confined double-nozzle spray cooling system |
| title_sort | experimental study on heat transfer enhancement using combined surface roughening and macro structures in a confined double nozzle spray cooling system |
| topic | Engineering::Mechanical engineering Spray Cooling Surface Roughness |
| url | https://hdl.handle.net/10356/162145 |
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