Application of a reflection-free DSM to turbulent flow and heat transfer in a square-sectioned U-bend |
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Authors: | H. Iacovides B.E. Launder H.-Y. Li |
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Affiliation: | Department of Mechanical Engineering, UMIST, Manchester, England |
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Abstract: | The paper reports the outcome of applying two differential second-moment (DSM) closures to resolve the complex three-dimensional motion that arises in turbulent flow in a square-sectioned duct passing around a 180°C bend. The initial results showed (in accord with a number of recent studies) that, with the same underlying closure hypotheses, a DSM scheme produces better agreement with experiment than does the corresponding algebraic second-moment (ASM) treatment, although the differences were acceptably small. Thereafter, applications are reported for a new type of DSM that employs no wall-reflection terms. This leads to markedly better predictions of the turbulence field and thus of the wall heat transfer than the conventionally adopted version. |
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Keywords: | turbulent flow streamline curvature curved ducts convective heat transfer turbulence modeling second-moment closure |
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