Theoretical and experimental studies of velocity and temperature distribution in three-dimensional turbulent wall jets

This paper presents the results of an experimental and theoretical investigation of the mean flow and thermal characteristics of three-dimensional turbulent jets issued from various rectangular channels parallel to an adiabatic wall. A series of experiments were carried out using rectangular outlets having aspect ratios of 0.1, 0.26, 0.44 and 1.0. Measurements were made of the velocity and temperature fields for a turbulent air jet discharging into stagnant air. Data were obtained for the axial velocity and temperature decays as well as jet momentum and thermal spread rates. A simplified theoretical model in which buoyancy effects are neglected is presented. The model is based on integral formulation of the conservation of mass, momentum and energy. The entrainment concept is used to provide closure. Reasonable agreement between theoretical predictions and experimental data is obtained.