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Computational Thermal Sciences: An International Journal

Publication de 6  numéros par an

ISSN Imprimer: 1940-2503

ISSN En ligne: 1940-2554

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Indexed in

PREDICTION OF TURBULENT HEAT TRANSFER IN RADIALLY OUTWARD FLOW IN A TWISTED-TAPE INSERTED TUBE ROTATING IN ORTHOGONAL MODE

Volume 3, Numéro 1, 2011, pp. 49-61
DOI: 10.1615/ComputThermalScien.v3.i1.40
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RÉSUMÉ

This paper presents numerically computed pressure-drop and heat-transfer characteristics of turbulent developing flow in a tube rotating in orthogonal mode. The tube is fitted with a twisted tape. The flow is radially outward. Numerical predictions are obtained by solving three-dimensional elliptic transport equations in a tube with a length-to-diameter ratio of 14.5. Turbulence effects are captured through use of 8 high-Reynolds-number form of the k − ε model. It is assumed that the tube is at axially and peripherally constant wall temperature and that the tape is perfectly conducting. Numerical predictions are obtained for both clockwise and counter-clockwise tape twist with respect to the direction of the tube axis. Axial variations of the apparent friction factor and of the Nusselt number are presented for air (Pr = 0.7) for 10, 000 < Re < 50, 000, twist ratio 3 ≤ Y ≤ ∞, rotation number 0 ≤ Ro ≤ 0.15, and buoyancy parameter 0 ≤ ΒΔT ≤ 0.30.

CITÉ PAR
  1. Eiamsa-ard S., Changcharoen W., Flow structure and heat transfer in a square duct fitted with dual/quadruple twisted-tapes: Influence of tape configuration, Journal of Mechanical Science and Technology, 29, 8, 2015. Crossref

  2. Date A. W., Some Observations on Thermodynamic Basis of Pressure Continuum Condition and Consequences of Its Violation in Discretised CFD, in 50 Years of CFD in Engineering Sciences, 2020. Crossref

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