COMPARISON OF MEASURED AND CALCULATED VELOCITY PROFILES OF A LAMINAR INCOMPRESSIBLE FREE JET AT LOW REYNOLDS NUMBERS

摘要

This paper presents a comparison of the measured and calculated velocity profiles of a laminar, incompressible, low Reynolds number jet. The experimental jet was produced by a "nozzle" which consists of a porous metal plate covering the end of a pipe. This nozzle produces a uniform exit velocity profile at Reynolds numbers well below those at which conventional contoured nozzles are completely filled by the boundary layer. A jet mixing analysis based on the boundary-layer equations accurately predicted the velocity field for each test condition. The Reynolds number based on nozzle diameter ranged from 50 to 1000 with jet exit velocity either 30 or 61 m/s (100 or 200 ft/sec).