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Turbulence and Shear Flow Phenomena -1 First International Symposium

ISBN:
1-56700-135-1 (Print)

TURBULENT HEAT TRANSFER IN A SQUARE DUCT WITH TWO OPPOSITE RIB-ROUGHENED WALLS

Masafumi Hirota
Department of Micro-Nano Systems Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603; Department of Mechanical Engineering, Mie University, Kurimamachiya-cho 1577, Tsu-city 514-850

Hideomi Fujita
Department of Mechanical Engineering, Nagoya University Chikusa-ku, Nagoya 464-8603, Japan; Department of Mechanical Engineering, Meijo University, Tenpaku-ku, Nagoya 468-8502, Japan

Gen-ichi Koarai
Department of Mechanical Engineering, Nagoya University Chikusa-ku, Nagoya 464-8603, Japan

Hiroyuki Yuasa
Nagasaki Works, Mitsubishi Electric Co. Ltd. Maruo, Nagasaki 850-91, Japan

Abstract

Experimental study was conducted on turbulent heat transfer in a square duct with two opposite rib-roughened walls, directing main attention to making clear the characteristics of the mean and fluctuating temperature fields. In particular, all three components of the turbulent heat fluxes were measured and were compared with those in the smooth duct. Near the smooth wall adjacent to the rough wall, the heat transport by turbulence is intensified more effectively than the momentum transport. On the other hand, near the rough wall, the turbulent heat transport becomes less active than momentum transport, and this causes the weak dissimilarity between the mean temperature and mean velocity distributions.