Enhanced heat transfer in rectangular duct with punched winglets

Pongjet Promvonge; Sompol Skullong

doi:10.1016/j.cjche.2019.09.012

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Enhanced heat transfer in rectangular duct with punched winglets

Fluid Dynamics and Transport Phenomena | Updated：2026-01-06

- Enhanced heat transfer in rectangular duct with punched winglets
- Chinese Journal of Chemical Engineering Vol. 28, Issue 3, Pages: 660-671(2020)
- Affiliations：
  
  1. Department of Mechanical Engineering, Faculty of Engineering, King Mongkut's Institute of Technology Ladkrabang,Bangkok,Thailand,10520
  2. Energy Systems Research Group, Department of Mechanical Engineering, Faculty of Engineering at Sriracha, Kasetsart University Sriracha Campus, 199 M. 6, Sukhumvit Rd., Sriracha, Chonburi,Thailand,20230
- Author bio：
- Funds：
- DOI：10.1016/j.cjche.2019.09.012
  CLC：
- Published：2020
- Accepted：
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Pongjet Promvonge, Sompol Skullong. Enhanced heat transfer in rectangular duct with punched winglets[J]. Chinese Journal of Chemical Engineering, 2020, 28(3): 660-671.
DOI：

Pongjet Promvonge, Sompol Skullong. Enhanced heat transfer in rectangular duct with punched winglets[J]. Chinese Journal of Chemical Engineering, 2020, 28(3): 660-671. DOI： 10.1016/j.cjche.2019.09.012.

摘要

Abstract

Thermal performance of a heat exchanger duct with punched winglets (PWs) mounted on the upper duct wall has been examined for Reynolds number (Re) ranging from 4100 to 25

500. In the present experiment

two types of PWs: punched delta- and elliptical-winglets (P-DW and P-EW) with four punched-hole sizes were tested at a fixed attack angle

optimal relative pitch and height. Also

data of solid delta- and elliptical-winglets (DW and EW) were included for comparison. The investigation has shown that the P-DW yields higher thermal-performance enhancement factor (η) than the P-EW. Although the solid DW and EW with no punch have the highest heat transfer and friction loss

the PWs yield better

than the solid ones. For PWs

the P-DW with smaller hole size has the peak heat transfer and friction loss around 5.7 and 40 times over the smooth duct

respectively but the optimum

of 2.17 is seen for the one with a certain hole size. The PWs provide

at about 5%-8% above the solid winglets.

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