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Journal of Enhanced Heat Transfer
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ISSN Imprimer: 1065-5131
ISSN En ligne: 1026-5511

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Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.v19.i5.30
pages 423-436

SWIRL-ENHANCED LAMINAR FORCED CONVECTION THROUGH AXIALLY TWISTED RECTANGULAR DUCTS-PART 1, FLUID FLOW

P. Patel
Thermal-Fluids and Thermal Processing Laboratory, College of Engineering and Applied Science, University of Cincinnati, Cincinnati, Ohio 45221-0072, USA
Raj M. Manglik
Thermal-Fluids and Thermal Processing Laboratory, Mechanical and Materials Engineering, University of Cincinnati, 2600 Clifton Ave, Cincinnati, OH 45220, USA
Milind A. Jog
Thermal-Fluids and Thermal Processing Laboratory, Department of Mechanical and Materials Engineering, University of Cincinnati, 2600 Clifton Ave, Cincinnati, OH 45220, USA

RÉSUMÉ

Low Reynolds number fully developed swirl flows through rectangular ducts that are helically twisted along their axis are computationally modeled. The twist ratio ξ(= 180° twist pitch/hydraulic diameter) and rectangular flow cross-section aspect ratio α (= height/width) characterize the duct's geometrical attributes. A parametric numerical study delineates the influence of flow rate (10 ≤ Re ≤ 1000) and duct geometry (ξ = 3.0, 6.0, and 12.0; α = 1.0,0.75, and 0.5) on swirl-flow generation and wall friction behavior. The surface curvature of the twisted duct perturbs the axial flow tangentially, thereby inducing superimposed secondary circulation that produces helical swirl in the core of the duct. With increasing Reynolds number and severity of duct twist (ξ= 12.0 → 3.0), or decreasing cross-section aspect ratio (α = 1.0 or square → 0.5 or slender rectangle), the swirl structure is seen to break up into multiple peripheral vortices but with increased magnitude of the primary core secondary-flow cell. Consequently, infixed pressure-gradient-driven flows, the friction factor for twisted ducts increases significantly relative to that in straight ducts of the same cross section.


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