The turbulent transport of heat within a longitudinal vortex/boundary layer interaction
Abstract
The turbulent transport of heat in boundary layer flows which contain coherent longitudinal swirl is examined. These flows often occur in energy conversion devices and can lead to localized augmentation of heat transfer. The underlying objective is to develop a simple model that engineers can use to predict local convection in these 3D flows. Very little is known about the turbulent transport of heat in such complex flow environments. Most widespread models, such as the mixing length and the kepsilon models, assume a turbulent transport proportional to the local gradient. This does not produce reasonable predictions of the flows containing counter gradients. Additionally, most heat transfer model assume the turbulent transport of heat is analogous with the momentum transfer. In 3D flows, it is unlikely that scalars will respond to the flow field in the same way that momentum will. For example, turbulent convection, induced by the large swirling motions, may transport scalar quantities to a greater extent than the momentum. The research consists of an experimental and a modeling effort. The goal of the experimental program is to measure the turbulent heat flux in three different flow configurations: a boundary layer containing a single longitudinal vortex; a boundary layer containing a horseshoe vortex; and the flow over a row of obstacles that generate an array of streamwise vortices.
 Publication:

NASA STI/Recon Technical Report N
 Pub Date:
 May 1989
 Bibcode:
 1989STIN...9118395E
 Keywords:

 Boundary Layer Flow;
 Flow Distribution;
 Heat Transfer;
 KEpsilon Turbulence Model;
 Turbulent Boundary Layer;
 Boundary Layer Transition;
 Convection;
 Heat Flux;
 HotWire Anemometers;
 NavierStokes Equation;
 Swirling;
 Three Dimensional Flow;
 Turbulent Flow;
 Fluid Mechanics and Heat Transfer