Mass transfer properties in a grid generated turbulent flow: some experimental investigations about the concept of turbulent diffusivity

✍ Scribed by F. Lemoine; Y. Antoine; M. Wolff; M. Lebouche

• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 530 KB
• Volume: 41
• Category: Article
• ISSN: 0017-9310
• DOI: 10.1016/s0017-9310(97)00362-1

✦ Synopsis

This paper is devoted to the analysis of the mass transfer properties in a grid generated turbulent flow. The closure of the transport equation of the turbulent mass flux has been experimentally investigated. Two combined optical non-intrusive methods, the laser-induced fluorescence and the laser Doppler velocimetry have been used in order to measure simultaneously and instantaneously the concentration of a passive contaminant and the velocity of the flow. It has been demonstrated that the approximation production = pressure scrambling is valid over the major part of the flowfield. A model for the pressure scrambling term has been analysed in order to define a turbulent diffusivity concept.