Parametric analysis of turbulent wall jets in still air

Abstract

In presenting experimental results on turbulent wall jets, most workers have adopted as basic scales the slot height b and jet exit velocity U j . Although this is a natural choice, experience with other flows like jets and boundary layers, where the details of the initial conditions are eventually (if not always rapidly) forgotten by the flow, prompts the question: cannot a gross parameter like the jet momentum flux M j rather than U j and b separately, suffice to determine the flow, at least in some region where the wall jet may be said to have attained a “fully-developed” state? If the answer to the question is yes, it would give a more compact and practically useful description of the flow than is currently available.