Developing turbulent flow in a 180(0) curved pipe and its downstream tangent
Abstract
Laser Doppler measurements of the longitudinal and circumferential velocity components are reported for developing turbulent flow in a strongly curved 180 degree pipe and its downstream tangent. In the bend, the mean longitudinal velocity component changes little after theta = 90 degrees but the circumferential component never achieves a fully developed state. Similar behavior is observed in the normal stresses, with large levels of flow anisotropy arising everywhere in the bend and downstream tangent. Between theta = 90 degrees and X/D = 5, the circumferential velocity profiles display reversals of the secondary flow which are essentially independent of the Reynolds number. Ostensible differences between turbulent flows through pipes of circular and square cross sections are revealed by comparing present results with the measurements of Chang, et al. Although limited in extent, the data should serve to guide and test theoretical developments for modeling developing turbulent flows in curved pipes.
 Publication:

Presented at the 2d Intern. Symp. on Appl. of Laser Anemometry to Fluid Mech
 Pub Date:
 May 1984
 Bibcode:
 1984laan.symp....2A
 Keywords:

 Laser Applications;
 Mathematical Models;
 Pipes (Tubes);
 Supercritical Flow;
 Turbulent Flow;
 Error Analysis;
 Flow Velocity;
 Inlet Flow;
 Laser Doppler Velocimeters;
 Reynolds Number;
 Stress Analysis;
 Tangents;
 Fluid Mechanics and Heat Transfer