A Comprehensive Numerical Study on Thermohydraulic Performance of Fluid Flow in Triangular Ducts with Delta-Winglet Vortex Generators. Issue 2 (20th January 2018)

• Record Type: Journal Article
• Authors: Akcayoglu, Azize; Nazli, Celal
• Is Part Of: Heat transfer engineering. Volume 39:Issue 2(2018)
• Page Start: 107
• Page End: 119
• Publication Date: 2018-01-20
• Subjects: Heat -- Transmission -- Periodicals; 621.4022
• DOI: 10.1080/01457632.2017.1288046
• Languages: English
• ISSNs: 0145-7632

Abstract

ABSTRACT: Triangular ducts fitted with various kinds of delta-winglet type vortex generators (VGs) are commonly used to achieve compactness and heat transfer enhancement in many industries. Successive locations of VGs on the inner surfaces of the ducts can be arranged in Common Flow Up (CFU) and Common Flow Down (CFD) orientations. In the present numerical study simultaneous effects of orientation and streamwise distance between VGs on triangular fin performance is carried out considering both global and local flow and heat transfer fields. With the configurations considered in this study, a CFD–CFU orientation and a nondimensional streamwise distance of 0.5 is determined as the best configuration. "RNG k-ϵ" turbulence model with "Enhanced wall treatment" option is determined as the best turbulence model to predict the flow fields inside the triangular duct with built-in VGs, for Reynolds number of 5000.