Journal of Fluid Mechanics



Centreline velocity decay measurements in low-velocity axisymmetric jets


TOR G. MALMSTRÖM a1, ALLAN T. KIRKPATRICK a2, BRIAN CHRISTENSEN a2 and KEVIN D. KNAPPMILLER a2
a1 Division of Building Services Engineering, Royal Institute of Technology (KTH), S-10044 Stockholm, Sweden
a2 Mechanical Engineering Department, Colorado State University, Fort Collins, CO 80523, USA

Abstract

The streamwise velocity profiles of low-velocity isothermal axisymmetric jets from nozzles of different diameters were measured and compared with previous experimental data. The objective of the measurements was to examine the dependence of the diffusion of the jet on the outlet conditions. As the outlet velocity was decreased, the centreline velocity decay coefficient began to decrease at an outlet velocity of about 6 m s−1.

(Received August 19 1993)
(Revised April 15 1997)



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