Comparative study on the enhancement of spray cooling heat transfer using conventional and bio-surfactants
In this paper, a comparative study is performed to evaluate the enhancement of spray cooling heat transfer using deionized water with a conventional surfactant (Tween 20) and two biosurfactants (Rhamnolipid and Sophorolipid). In the single-phase regime, appreciable enhancement on spray cooling heat...
| Main Authors: | , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
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2022
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| Online Access: | https://hdl.handle.net/10356/160463 |
| _version_ | 1811683785743269888 |
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| author | Liu, Pengfei Kandasamy, Ranjith Ho, Jin Yao Feng, Huicheng 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 Feng, Huicheng Wong, Teck Neng |
| author_sort | Liu, Pengfei |
| collection | NTU |
| description | In this paper, a comparative study is performed to evaluate the enhancement of spray cooling heat transfer using deionized water with a conventional surfactant (Tween 20) and two biosurfactants (Rhamnolipid and Sophorolipid). In the single-phase regime, appreciable enhancement on spray cooling heat transfer can be achieved using Rhamnolipid additive. However, the addition of Sophorolipid leads to a decrease in the single-phase spray cooling heat transfer. Meanwhile, in the nucleate boiling, spray cooling heat transfer is substantially enhanced using any of the three tested surfactants due to the decrease in surface tension and enhanced wettability. At the same concentration, the two biosurfactants lead to higher heat transfer than Tween 20 due to their lower surface tension as compared to Tween 20. The maximum spray cooling heat transfer enhancement is found to be 37%, 55%, or 41% using Tween 20, Rhamnolipid, or Sophorolipid, respectively as compared to deionized water. The surface condition after testing is also studied. Residual deposition is observed after testing when Rhamnolipid is added into deionized water whereas the addition of Sophorolipid leads to strong surface oxidation after testing. The strong surface oxidation causes the decrease in the rate of increment of the heat flux with increasing temperature difference. Comparatively, no distinction can be observed before and after testing when Tween 20 solution is used. |
| first_indexed | 2024-10-01T04:18:15Z |
| format | Journal Article |
| id | ntu-10356/160463 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T04:18:15Z |
| publishDate | 2022 |
| record_format | dspace |
| spelling | ntu-10356/1604632022-07-22T08:23:48Z Comparative study on the enhancement of spray cooling heat transfer using conventional and bio-surfactants Liu, Pengfei Kandasamy, Ranjith Ho, Jin Yao Feng, Huicheng Wong, Teck Neng School of Mechanical and Aerospace Engineering Engineering::Mechanical engineering Biosurfactant Deionized Water In this paper, a comparative study is performed to evaluate the enhancement of spray cooling heat transfer using deionized water with a conventional surfactant (Tween 20) and two biosurfactants (Rhamnolipid and Sophorolipid). In the single-phase regime, appreciable enhancement on spray cooling heat transfer can be achieved using Rhamnolipid additive. However, the addition of Sophorolipid leads to a decrease in the single-phase spray cooling heat transfer. Meanwhile, in the nucleate boiling, spray cooling heat transfer is substantially enhanced using any of the three tested surfactants due to the decrease in surface tension and enhanced wettability. At the same concentration, the two biosurfactants lead to higher heat transfer than Tween 20 due to their lower surface tension as compared to Tween 20. The maximum spray cooling heat transfer enhancement is found to be 37%, 55%, or 41% using Tween 20, Rhamnolipid, or Sophorolipid, respectively as compared to deionized water. The surface condition after testing is also studied. Residual deposition is observed after testing when Rhamnolipid is added into deionized water whereas the addition of Sophorolipid leads to strong surface oxidation after testing. The strong surface oxidation causes the decrease in the rate of increment of the heat flux with increasing temperature difference. Comparatively, no distinction can be observed before and after testing when Tween 20 solution is used. Ministry of Education (MOE) Nanyang Technological University National Research Foundation (NRF) This research is supported by the National Research Foundation, Singapore, under its Green Data Centre Research Programme (NRF2015ENC-GDCR01001-010). The third author 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. 2022-07-22T08:23:48Z 2022-07-22T08:23:48Z 2021 Journal Article Liu, P., Kandasamy, R., Ho, J. Y., Feng, H. & Wong, T. N. (2021). Comparative study on the enhancement of spray cooling heat transfer using conventional and bio-surfactants. Applied Thermal Engineering, 194, 117047-. https://dx.doi.org/10.1016/j.applthermaleng.2021.117047 1359-4311 https://hdl.handle.net/10356/160463 10.1016/j.applthermaleng.2021.117047 2-s2.0-85107265703 194 117047 en NRF2015ENC-GDCR01001-010 Applied Thermal Engineering © 2021 Elsevier Ltd. All rights reserved. |
| spellingShingle | Engineering::Mechanical engineering Biosurfactant Deionized Water Liu, Pengfei Kandasamy, Ranjith Ho, Jin Yao Feng, Huicheng Wong, Teck Neng Comparative study on the enhancement of spray cooling heat transfer using conventional and bio-surfactants |
| title | Comparative study on the enhancement of spray cooling heat transfer using conventional and bio-surfactants |
| title_full | Comparative study on the enhancement of spray cooling heat transfer using conventional and bio-surfactants |
| title_fullStr | Comparative study on the enhancement of spray cooling heat transfer using conventional and bio-surfactants |
| title_full_unstemmed | Comparative study on the enhancement of spray cooling heat transfer using conventional and bio-surfactants |
| title_short | Comparative study on the enhancement of spray cooling heat transfer using conventional and bio-surfactants |
| title_sort | comparative study on the enhancement of spray cooling heat transfer using conventional and bio surfactants |
| topic | Engineering::Mechanical engineering Biosurfactant Deionized Water |
| url | https://hdl.handle.net/10356/160463 |
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