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Journal of Enhanced Heat Transfer
Factor de Impacto: 0.562 Factor de Impacto de 5 años: 0.605 SJR: 0.175 SNIP: 0.361 CiteScore™: 0.33

ISSN Imprimir: 1065-5131
ISSN En Línea: 1026-5511

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Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.2012005641
pages 437-450

SWIRL-ENHANCED LAMINAR FORCED CONVECTION THROUGH AXIALLY TWISTED RECTANGULAR DUCTS-PART 2, HEAT TRANSFER

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

SINOPSIS

Convective heat transfer in low Reynolds number (10 ≤ Re ≤ 1000) fully developed swirl flows produced in axially twisted rectangular ducts is characterized. Computational results are presented to highlight the effects of the flow field, which is altered by variations in the duct geometry (cross-sectional height-to-width aspect ratio: 0.5 ≤ α ≤ 1.0; and 180° helical-twist pitch-to-hydraulic-diameter ratio: 3.0 ≤ ξ ≤ 12.0) and flow rate, on the temperature distribution and heat transfer coefficient. The two primary wall heating/cooling conditions (T and H1) are considered, with flows representing a wide range of viscous liquids (5 ≤ Pr ≤ 100). Increasing swirl-induced mixing as α → 0.5, ξ → 3.0, and Re > O[100], characterized by pronounced core circulation accompanied with multiple peripheral vortices, is found to enhance the heat transfer coefficient by 2.6 to 14 times that in an equivalent straight duct. The larger benefits accrue in higher Pr liquids, and 2.4 to 13 times higher heat transfer rate can be accommodated on a fixed pumping power basis; alternatively, 50% to 90% reduction in heat exchanger surface area can be achieved on a fixed pressure drop and heat load basis