Publicou 8 edições por ano
ISSN Imprimir: 1065-5131
ISSN On-line: 1563-5074
Indexed in
The Scaling and Correlation of Low Reynolds Number Swirl Flows and Friction Factors in Circular Tubes with Twisted-Tape Inserts
RESUMO
This paper assesses the scaling and correlation of fully developed swirl generated by twisted-tape inserts in laminar circular-tube flows. The tape-induced secondary fluid circulation is shown to be characterized by a helical vortex, which grows and breaks up into a pair of counterrotating vortices with decreasing tape-twist ratio y and/or increasing axial flow Reynolds number Re. The validity of correlating isothermal friction factors in such fully developed, two-vortex-cell laminar flows by the swirl parameter (Sw = Res / √y) proposed in an earlier study (Manglik and Bergles [1993a]) is evaluated. Experimental data and computational simulations reported in the literature for a wide range of laminar flow conditions (43 < Re < 2720) and twist ratios (1.5 ≤ y ≤ ∞) of the tape inserts are considered. All data and numerical results are found to be in excellent agreement (within ±10%) with the predictions of the Manglik and Bergles f-correlation. This clearly establishes its generalized design applicability as well as verifies the scaling of tape-induced swirl flows by the parameter Sw.
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