Heat transfer augmentation in a circular tube with winglet vortex generators

Suriya Chokphoemphun; Monsak Pimsarn; Chinaruk Thianpong; Pongjet Promvonge

doi:10.1016/j.cjche.2014.04.002

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Heat transfer augmentation in a circular tube with winglet vortex generators

流体力学与传递现象 | Updated：2026-01-06

- Heat transfer augmentation in a circular tube with winglet vortex generators
- Chinese Journal of Chemical Engineering Vol. 23, Issue 4, Pages: 605-614(2015)
- Affiliations：
  
  Department of Mechanical Engineering, Faculty of Engineering, King Mongkut's Institute of Technology Ladkrabang,Bangkok,Thailand,10520
- Author bio：
- Funds：
- DOI：10.1016/j.cjche.2014.04.002
  CLC：
- Published：2015
- Accepted：
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Suriya Chokphoemphun, Monsak Pimsarn, Chinaruk Thianpong, Pongjet Promvonge. Heat transfer augmentation in a circular tube with winglet vortex generators[J]. Chin.J.Chem.Eng., 2015, 23(4): 605-614.
DOI：

Suriya Chokphoemphun, Monsak Pimsarn, Chinaruk Thianpong, Pongjet Promvonge. Heat transfer augmentation in a circular tube with winglet vortex generators[J]. Chin.J.Chem.Eng., 2015, 23(4): 605-614. DOI： 10.1016/j.cjche.2014.04.002.

摘要

Abstract

The article presents the influence of winglet vortex generators (WVGs) placed in the core flow area on thermal performance enhancement of a tube heat exchanger. The experiment was carried out in a uniform wall heat-fluxed tube by varying turbulent airflowfor Reynolds number ranging from 5300 to 24000. In the present work

the WVGs with an attack angle of 30° were inserted into the test tube at four different winglet pitch ratios (R

= P/D) and three winglet-width or blockage ratios (R

= e/D). The experimental results at various R

and R

values were evaluated and compared with those for smooth tube and tubes with twisted tape or wire coil. The measurement reveals that the WVGs enhance considerably the heat transfer and friction loss above the plain tube

wire coil and twisted tape. The Nusselt number and friction factor increase with the increment of R

and Re butwith the decreasing R

. The average Nusselt numbers for theWVGswith various R

are in the range of 2.03-2.34 times above the plain tube. The thermal performance for the WVGs is found to be much higher than that for the wire coil and twisted tape and is in a range of 1.35-1.59. Also

a numerical investigation is conducted to st

udy the flow structure and heat transfer enhancement mechanisms in the winglet-inserted tube.

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