Structure of velocity and temperature fields in laminar channel flows with longitudinal vortex generators
Abstract
Laminar velocity and temperature fields in a rectangular channel with a row of builtin vortex generators in the form of slender delta wings and winglet pairs have been calculated by means of a zonal method consisting of zones of complete and partially parabolized NavierStokes and energy equations. A modified version of SOLA for incompressible as well as for variabledensity, smallMach number flows has been used to solve the basic equations. Each wing or winglet pair generates counterrotating longitudinal vortices that, in contrast to similar vortices in an unbounded medium, show an elliptic deformation, a wakelike axial velocity distribution in the core, and an absence of breakdown even at angles of attack as large as 50 deg. The spiraling motion induced by these vortices in the channel can locally enhance the heat transfer coefficient by a factor of 3 compared to its value in a wingless channel. The temperature dependence of density can reduce this enhancement by roughly 10 percent when the ratio of gastowall temperature is 1.3.
 Publication:

Numerical Heat Transfer Part A  Applications
 Pub Date:
 1989
 DOI:
 10.1080/10407788908944689
 Bibcode:
 1989NHTA...15..281F
 Keywords:

 Computational Fluid Dynamics;
 Laminar Flow;
 Temperature Distribution;
 Turbulent Heat Transfer;
 Velocity Distribution;
 Vortex Generators;
 Boundary Layer Control;
 Delta Wings;
 Flow Geometry;
 Heat Transfer Coefficients;
 Numerical Flow Visualization;
 Winglets;
 Fluid Mechanics and Heat Transfer