Computer Science
Scientific paper
Jan 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994phdt........10e&link_type=abstract
Thesis (PH.D.)--RENSSELAER POLYTECHNIC INSTITUTE, 1994.Source: Dissertation Abstracts International, Volume: 55-08, Section: B,
Computer Science
Scientific paper
An experimental and numerical investigation of turbulent flow in longitudinally finned tubes has been performed in four parts: an adiabatic air flow experiment in which details of the turbulent flow in three different finned tubes were measured with a laser-Doppler velocimeter; a high temperature gas experiment in which the overall heat transfer characteristics of seven finned ceramic tubes were measured; a finite difference numerical investigation of fully developed flow employing an anisotropic, algebraic turbulence model using vorticity flux terms; and the development of a method to predict the pressure drop and heat transfer rates based on an analysis of characteristic lengths. The adiabatic fluid flow experiment was performed with two eight-fin tubes and one sixteen-fin tube. Measurements of mean velocities, and turbulent stresses were performed at nominal Reynolds numbers of 10,000, 50,000, and 100,000. The flow structure was seen to be independent of Reynolds numbers at values above 50,000. Four secondary flow cells were found per fin and were small (3-5%) in comparison to the mean axial flow. High temperature heat transfer data were taken in seven silicon carbide tubes with between 8 and 24 axial fins with height-to-diameter ratios of 0.06 to 0.16. Heat transfer tests were performed under both heating and cooling conditions (wall-to-bulk temperature ratios of 0.5 to 1.6) at bulk temperatures between 30 and 1250 ^circC over a Reynolds number range of 5,000 to 150,000. Data were fit to separate power curves for each individual ceramic tube. Numerical prediction of the flow and heat transfer was performed following the development of an anisotropic model of turbulent vorticity fluxes. The turbulence model was based on scalar flux models and has been shown to have potential for improvement over turbulence models based on modeling individual turbulent stresses. A method for predicting pressure drop and heat transfer in finned tubes was developed based on an analysis of turbulent structures observed in the adiabatic flow experiments. The method was accurate to +/-10% for most of the available data.
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