DEVELOPING FLOW REGION OF AXISYMMETRIC TURBULENT JETS
In the developing zone of a circular jet diffusing in a co-flowing stream, the flow velocity changes from the jet velocity U0 to the uniform ambient velocity Ua. The thickness of the potential core gradually diminishes in the streamwise direction and beyond the potential core length,x0, no uniform flow region exists across the jet. The flow parameters at the location x0 act as the initial condition for the analysis of jets in the fully developed region. The excess velocity within the shear layer exhibits similarity and the integral technique is often adopted for prediction of the length of the potential core. The length of the potential core found from various theoretical models differs significantly. The present investigation is an adaptation of Reichardts hypothesis and the point source technique. Using a single coefficient of expansion the velocity distribution in the annular shear layer is predicted. The transition from the developing to the developed flow zone takes place in a seamless fashion. The length of the potential core is estimated based on the predictions of the maximum velocity on the axis of the jet.
potential core compound jets annular shear layer point source co-flowing jets
Bidya S.Pani
Indian Institute of Technology, Bombay, India Mumbai 400076, India
国际会议
第16届亚太地区国际水利学大会暨第3届水工水力学国际研讨会(16th IAHR-APD Congress and 3rd Symoposium of IAHR-ISHS)
南京
英文
630-634
2008-10-20（万方平台首次上网日期，不代表论文的发表时间）