TED-AJ03-109 COMPUTATION OF TURBULENT HEAT TRANSFER IN A SQUARE DUCT WITH ONE ROUGHENED WALL BY USING ALGEBRAIC HEAT FLUX MODELS

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概要

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• Calculations have been performed for fully developed turbulent flow and heat transfer in a square duct with one roughened wall. Figure A-1 shows the coordinate system and the schematic diagram of a square duct with one roughened wall. This paper focuses on the application of three algebraic models of the turbulent heat flux transport equation in order to predict turbulent heat flux component behavior. The convection and diffusion terms in this transport equation are modeled in a manner similar to Rodi's approximation for corresponding terms in the Reynolds stress transport equations. The pressure-temperature gradient term is simulated by means of three models : one a composite based on the "slow" and "rapid" interaction models proposed by Lumley and Launder (LL), respectively, and another, the model proposed by Shih and Lumley (SL), and the other, the model proposed by Craft and Launder (CL). These three models lead to predicted mean temperature distributions in the duct cross plane that are in relatively good agreement with experimentally measured distributions as shown in Figure A-2. In Figure A-2,three calculated results are displayed in left hand side of each figure. It has been pointed out as a characteristic feature that the contour lines are distorted by the secondary flow of the second kind near the upper smooth wall. Adding to this, [figure] calculated turbulent heat flux component distributions in the cross plane show that the three models predict experimentally observed features in the flow. Considering that the pressure-temperature gradient term of CL model is composed of many terms compared with the other two models, calculated results have suggested that the turbulent heat flux distributions in a square duct with one roughed wall could be predicted well by adopting simple model such as LL and SL models.[figure]

• 一般社団法人日本機械学会の論文

著者

• Sugiyama Hitoshi

  Graduate School Of Engineering Utsunomiya University

• Sugiyama Hitoshi

  Graduate School Of Energy And Environmental Science Utsunomiya University

• TOSEN Masahiro

  Graduate School of Engineering, Utsunomiya University

• GESSNER Fred

  Department of Mechanical Engineering, University of Washington

• Gessner Fred

  Department Of Mechanical Engineering University Of Washington

• Tosen Masahiro

  Graduate School Of Engineering Utsunomiya University

関連論文

• Development of 3-Dimensional 3-Component PIV Considering Scheimpflug Condition
• TED-AJ03-109 COMPUTATION OF TURBULENT HEAT TRANSFER IN A SQUARE DUCT WITH ONE ROUGHENED WALL BY USING ALGEBRAIC HEAT FLUX MODELS

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