Heat transfer enhancement and temperature uniformity improvement of microchannel heat sinks with twisted blade-like fins
To enhance heat and fluid exchange between main flow and near-wall flow in microchannels, a twisted blade-like fin with an advantage in stimulating both spanwise and normalwise secondary flow is proposed. The cross sections of the fin are low-drag airfoils in different orientations. The flow and hea...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2023-12-01
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| Series: | Case Studies in Thermal Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214157X23010948 |
| _version_ | 1797422609722245120 |
|---|---|
| author | Shiyang Chen Zhenwei Liu Boyuan Wang Ping Li |
| author_facet | Shiyang Chen Zhenwei Liu Boyuan Wang Ping Li |
| author_sort | Shiyang Chen |
| collection | DOAJ |
| description | To enhance heat and fluid exchange between main flow and near-wall flow in microchannels, a twisted blade-like fin with an advantage in stimulating both spanwise and normalwise secondary flow is proposed. The cross sections of the fin are low-drag airfoils in different orientations. The flow and heat transfer performances of microchannels with fins are numerically investigated at Re = 50–700. The results show that the twisted blade-like fin improves heat transfer process significantly, especially wall temperature uniformity, and reduces the flow separation region behind the fin, resulting in an obvious small pressure penalty. At small inflow (Re = 50), the best heat transfer and lowest pressure penalty are obtained in the microchannel with a single fin. When Re > 150, better heat transfer is obtained in the microchannel with three fins, and the highest comprehensive thermal performance (TP) reaches 3.58. The twisted direction of fins has a significant effect on heat transfer but less on flow drag. Due to the twisted fins, left and right walls experience an overall decline in temperature, and the temperature uniformity of top and bottom walls is improved. Compared with a smooth microchannel, the average and maximum temperature of the investigated microchannels are reduced by 48.1 K and 49.0 K at most respectively. |
| first_indexed | 2024-03-09T07:34:48Z |
| format | Article |
| id | doaj.art-faaab99b61a7423fb2382113b54f9276 |
| institution | Directory Open Access Journal |
| issn | 2214-157X |
| language | English |
| last_indexed | 2024-03-09T07:34:48Z |
| publishDate | 2023-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Thermal Engineering |
| spelling | doaj.art-faaab99b61a7423fb2382113b54f92762023-12-03T05:41:37ZengElsevierCase Studies in Thermal Engineering2214-157X2023-12-0152103788Heat transfer enhancement and temperature uniformity improvement of microchannel heat sinks with twisted blade-like finsShiyang Chen0Zhenwei Liu1Boyuan Wang2Ping Li3MOE Key Laboratory of Thermo–Fluid Science and Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, 710049, ChinaMOE Key Laboratory of Thermo–Fluid Science and Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, 710049, ChinaMOE Key Laboratory of Thermo–Fluid Science and Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, 710049, ChinaCorresponding author.; MOE Key Laboratory of Thermo–Fluid Science and Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, 710049, ChinaTo enhance heat and fluid exchange between main flow and near-wall flow in microchannels, a twisted blade-like fin with an advantage in stimulating both spanwise and normalwise secondary flow is proposed. The cross sections of the fin are low-drag airfoils in different orientations. The flow and heat transfer performances of microchannels with fins are numerically investigated at Re = 50–700. The results show that the twisted blade-like fin improves heat transfer process significantly, especially wall temperature uniformity, and reduces the flow separation region behind the fin, resulting in an obvious small pressure penalty. At small inflow (Re = 50), the best heat transfer and lowest pressure penalty are obtained in the microchannel with a single fin. When Re > 150, better heat transfer is obtained in the microchannel with three fins, and the highest comprehensive thermal performance (TP) reaches 3.58. The twisted direction of fins has a significant effect on heat transfer but less on flow drag. Due to the twisted fins, left and right walls experience an overall decline in temperature, and the temperature uniformity of top and bottom walls is improved. Compared with a smooth microchannel, the average and maximum temperature of the investigated microchannels are reduced by 48.1 K and 49.0 K at most respectively.http://www.sciencedirect.com/science/article/pii/S2214157X23010948Twisted blade-like finSecondary flowHeat transfer enhancementWall temperature uniformityMicrochannel heat sinks |
| spellingShingle | Shiyang Chen Zhenwei Liu Boyuan Wang Ping Li Heat transfer enhancement and temperature uniformity improvement of microchannel heat sinks with twisted blade-like fins Case Studies in Thermal Engineering Twisted blade-like fin Secondary flow Heat transfer enhancement Wall temperature uniformity Microchannel heat sinks |
| title | Heat transfer enhancement and temperature uniformity improvement of microchannel heat sinks with twisted blade-like fins |
| title_full | Heat transfer enhancement and temperature uniformity improvement of microchannel heat sinks with twisted blade-like fins |
| title_fullStr | Heat transfer enhancement and temperature uniformity improvement of microchannel heat sinks with twisted blade-like fins |
| title_full_unstemmed | Heat transfer enhancement and temperature uniformity improvement of microchannel heat sinks with twisted blade-like fins |
| title_short | Heat transfer enhancement and temperature uniformity improvement of microchannel heat sinks with twisted blade-like fins |
| title_sort | heat transfer enhancement and temperature uniformity improvement of microchannel heat sinks with twisted blade like fins |
| topic | Twisted blade-like fin Secondary flow Heat transfer enhancement Wall temperature uniformity Microchannel heat sinks |
| url | http://www.sciencedirect.com/science/article/pii/S2214157X23010948 |
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