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HEAT TRANSFER IN A TURBULENT CHANNEL FLOW WITH ROUGHNESS

Stefano Leonardi
The University of Texas at Dallas

Paolo Orlandi
Department of Mechanics and Aeronautics, "Sapienza" University of Rome, Via Eudossiana 18, 00184 Rome, Italy

Robert Anthony Antonia
Discipline of Mechanical Engineering, University of Newcastle, Newcastle, 2308, NSW, AUSTRALIA

Abstract

DNSs are carried out for passive heat transport in a turbulent channel flow with square bars on one wall. The total heat transfer depends on w/k, the pitch to height ratio of the roughness and it is maximum for w/k = 7. Instantaneous contours of streamwise velocity and scalar fluctuations are closely similar for w/k = 1. The mean temperature, scaled on wall units, has a slope which depends on w/k. The concept of a temperature roughness function is therefore questionable unless a virtual origin is used.