화학공학소재연구정보센터
Chemical Engineering Research & Design, Vol.89, No.4A, 446-455, 2011
Transport of a passive scalar across a protective wall-jet in a pipe. Part II: Analysis and interpretation
First part of this paper (Tesar, 2011) described experimental investigations, combined with numerical flowfield computations, of a pipe flow in which a parallel wall-jet is blown along the inner surface of the pipe. The aim is to separate the main central flow and prevent its contact with the pipe wall. Although originally motivated by the problem of preventing transport of radioactivity to a radiation detector and its activation, the investigations used heat/mass transport analogy so that the actual subject of investigation was transport of heat from warm central air flow across a cool wall-jet flow into the (also cool) wall of the flow containing pipe. This heat transfer is itself also a problem which may be of interest in applications. In the previous part, apart from the description of the experiments, were also presented the basic characteristics of the time-mean velocity and temperature profiles. This second part analyses the obtained combined experimental and computational data to deduce information about general character and intensity of the radial transport across the turbulent protective wall-jets. (C) 2010 The Institution of Chemical Engineers. Published by Elsevier BM. All rights reserved.