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ISSN Druckformat: 1065-5131
ISSN Online: 1563-5074
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SWIRL-ENHANCED LAMINAR FORCED CONVECTION THROUGH AXIALLY TWISTED RECTANGULAR DUCTS-PART 2, HEAT TRANSFER
ABSTRAKT
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
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