Experimental Investigation on Turbulent Convection in Solar Air Heater Channel Fitted with Delta Winglet Vortex Generator

Sompol Skullong; Pongjet Promvonge

doi:10.1016/S1004-9541(14)60030-6

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Experimental Investigation on Turbulent Convection in Solar Air Heater Channel Fitted with Delta Winglet Vortex Generator

流体力学与传递现象 | Updated：2026-01-06

- Experimental Investigation on Turbulent Convection in Solar Air Heater Channel Fitted with Delta Winglet Vortex Generator
- Chinese Journal of Chemical Engineering Vol. 22, Issue 1, Pages: 1-101004-954160030-6(2014)
- Affiliations：
  
  2 Department of Mechanical Engineering, Faculty of Engineering, King Mongkut's Institute of Technology Ladkrabang,Bangkok,Thailand,10520
- Author bio：
- Funds：
- DOI：10.1016/S1004-9541(14)60030-6
  CLC：
- Published：2014
- Accepted：
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Sompol Skullong, Pongjet Promvonge. Experimental Investigation on Turbulent Convection in Solar Air Heater Channel Fitted with Delta Winglet Vortex Generator[J]. Chin.J.Chem.Eng., 2014, 22(1): 1-10.
DOI：

Sompol Skullong, Pongjet Promvonge. Experimental Investigation on Turbulent Convection in Solar Air Heater Channel Fitted with Delta Winglet Vortex Generator[J]. Chin.J.Chem.Eng., 2014, 22(1): 1-10. DOI： 10.1016/S1004-9541(14)60030-6.

摘要

Abstract

The paper presents an experimental study on the heat transfer and flow friction characteristics in a solar air heater channel fitted with delta-winglet type vortex generators (DWs). The experiments are conducted by varying the airflow rate for Reynolds number in the range of 5000 to 24000 in the test section with a uniform heat-flux applied on the upper channel wall. Firstly

the DW pairs are mounted only at the entrance of the lower wall of the test channel (called DW-E) to create multiple vortex flows at the entry. The effect of two transverse pitches (R

/H=1 and 2) at three attack angles (α=30°

45° and 60°) of the DW-E with its relative height

b/H=0.5 (half height of channel) is examined. Secondly

the 30° DWs with three different relative heights (b/H 0.3

0.4 and 0.5) are placed on the upper wall only (absorber plate

called DW-A) of the test channel. The experimental result reveals that in the first case

the 60° DW-E at R

=1 provides the highest heat transfer and friction factor while the 30° DW-E at R

=1 performs overall better than the others. In the second case

the 30° DW-A at b/H=0.5 yields the highest heat transfer and friction factor but the best thermal

performance is found at b/H=0.4.

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