Experimental study of turbulent jets and forced plumes: Entrainment profile coefficients and predictions from some existing models

Abstract

Integral models based on entrainment hypothesis have been used for several decades to make growth predictions for turbulent jets and plumes. Although useful, these models are based on ad-hoc assumptions, and say very little about the underlying flow physics. Recently, van Reeuwijk & Craske (2015) derived an energy consistent unified entrainment relation, which separates the contributions from mean and turbulence in velocity, buoyancy and pressure via profile coefficients. Here, we present the results of simultaneous time resolved measurement of velocity and density in an axisymmetric turbulent jet and a forced plume using 2D-2C particle image velocimetry (PIV) and planar laser induced fluore..