Effect of Delta–Winglet Vortex Generators on a Forced Convection Heat Transfer in an Asymmetrically Heated Triangular Duct

E.Zangana, Hamid; A. Abdul-Rassol, Adnan; A. Al-Taher, Mohanad

doi:10.37649/aengs.2007.14241

	Effect of Delta–Winglet Vortex Generators on a Forced Convection Heat Transfer in an Asymmetrically Heated Triangular Duct
Anbar Journal of Engineering Sciences
Article 3, Volume 1, Issue 1, 2008, Pages 31-44 PDF (301.24 K)
DOI: 10.37649/aengs.2007.14241
Authors
Hamid E.Zangana; Adnan A. Abdul-Rassol; Mohanad A. Al-Taher
Abstract
An experimental investigation is performed to study the friction factor ( f ) and convection heat transfer coefficient (h) behavior in an asymmetrically heated equilateral triangular duct by using delta–winglets vortex generators which are embedded in a turbulent boundary layer. Two side walls of the heated test section are electrically heated with a constant heat flux, whereas the lower wall is indirectly heated. Reynolds number (Re) is ranged from (23,000) to (58,000). Two sizes and three attack angles of vortex generators are studied here for three cases; single, double, and treble pairs of generators. Each pair was supported in one wall of the test section at the various locations from the leading edge. The indicated results that friction factor ( f )and Nusselt number (Nu) are relatively proportion with the size, number and the inclination angle of the generators. The ( f ) decreases as airflow rate increases whereas Nu number increases. The present data of ( f ) is less than the data of Chegini by about (6.5 %) and overpredicts the data of Altemani by about (1.7 %).
Keywords
Heat transfer enhancement; Noncircular ducts; Delta; Winglet Vortex Generators; Turbulent flow

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