Entrance and diameter effects on the laminar flow in sudden expansions
Abstract
A finitedifference numerical procedure is used to solve the equations governing the laminar, incompressible flow in axisymmetric sudden expansions. For up to 6 diameter ratios and two inlet velocity profiles, the reattachment lengths of the recirculation zones are plotted against Reynolds number and the expansion step height. A linear variation is found to exist for all Reynolds numbers situations; while a nonlinear relationship is found for the length vs. step height for all Reynolds numbers; moreover, the reattachment lengths obtained using a parabolic inlet profile are found to be larger than those obtained using a uniform inlet profile. Velocity and pressure profiles are also presented.
 Publication:

Momentum and Heat Transfer Processes in Recirculating Flows
 Pub Date:
 1980
 Bibcode:
 1980mhtp.proc...21P
 Keywords:

 Computational Fluid Dynamics;
 Flow Geometry;
 Incompressible Flow;
 Inlet Flow;
 Laminar Flow;
 Axisymmetric Flow;
 Biological Models (Mathematics);
 Channel Flow;
 Diameters;
 Finite Difference Theory;
 Flow Equations;
 Flow Velocity;
 Pressure Distribution;
 Reattached Flow;
 Velocity Distribution;
 Fluid Mechanics and Heat Transfer