Dynamics of Turbulent Flow Structures and Transport Phenomena: Implications to Equipment Design.

Speaker: Dr. JYESHTHARAJ BHALCHANDRA JOSHI, DAE-Homi Bhabha Chair Professor, Homi Bhabha National Institute, Mumbai, India.
Date: Thursday, March 22, 2012
Time: 05:30 P.M.
Venue: L-11

Tea to be served at 5:15 p.m.

PS: Dr. Joshi will be available for discussion the entire day of 22 March. People interested in meeting him should contact Dr. Prabhat Munshi ( This e-mail address is being protected from spambots. You need JavaScript enabled to view it. ) by Wednesday.

Abstract:

Most of the heat transfer equipment are operated in turbulent regime. The flow patterns in these equipment are complex and are characterized by flow structures (“turbulent eddies”) of wide range of length and time scales. The accurate quantification of these flow structures is very difficult and hence the present design practices are still empirical. Methods will be discussed regarding age, size, shape and energy content distribution of the flow structures. Consideration of these structure properties is important for the accurate estimation of design parameters such as heat transfer coefficient, mixing efficiency, drag coefficient etc. The flow structure information provides useful insights into the views of earlier established analytical and heuristic theories of heat and mass transfer. Such understanding between the structure dynamics and the transport phenomena has helped in the optimization of flow pattern. In addition to flow structure information, these advanced computational tools can be used to understand intensity of modeling assumptions in popular k/ε and Reynolds stress models. Based on such understanding, some success stories will be described for the novel equipment design which have already been implemented in the industry.