Publication de 6 numéros par an
ISSN Imprimer: 1940-2503
ISSN En ligne: 1940-2554
Indexed in
PREDICTION OF TURBULENT HEAT TRANSFER IN RADIALLY OUTWARD FLOW IN A TWISTED-TAPE INSERTED TUBE ROTATING IN ORTHOGONAL MODE
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.
-
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
-
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