WALL PROPERTIES AND HEAT TRANSFER IN NEAR-WALL TURBULENT FLOW

Abstract

Direct numerical simulation of a passive scalar in fully developed turbulent channel flow is used to show that Nusselt number is not only a function of Reynolds and Prandtl number, but also depends on properties of a heating wall. Variable thickness of the heating wall and variable heater properties, combined in a fluid–solid thermal activity ratio , can change the Nusselt number of the turbulent channel flow for up to 1% at the same Reynolds and Prandtl number and at the same wall heat flux.

This research was supported by the Ministry of Education, Science and Sport, Republic of Slovenia. A. Mosyak was supported by a joint grant from the Center for Absorption in Science of the Ministry of Immigrant Absorption and the Committee for Planning and Budgeting of the Council for Higher Education under the framework of the KAMEA program. E. Pogrebnyak was supported by the Center for Absorption in Science, Ministry of Immigrant Absorption, State of Israel. Computer resources were provided by Inter-University Computation Center, High Performance Computing Unit, Israel (SGI Origin), and Marand d.o.o., Sun Microsystems, Inc., Service Provider in Slovenia.