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Journal of Flow Visualization and Image Processing

ISSN Print: 1065-3090
ISSN Online: 1940-4336

Journal of Flow Visualization and Image Processing


pages 41-50

EXPERIMENTAL AND NUMERICAL FLOW VISUALIZATIONS OF MIXED CONVECTION WITH FLOW REVERSAL IN A HORIZONTAL ISOTHERMAL CHANNEL

Yoshisada Sakamoto
Hitachizosen Information System Co., Ltd., 7-37-10 Nisikamata, Ohta, Tokyo, 144-0051 Japan
Tomoaki Kunugi
Department of Nuclear Engineering, Graduate School of Engineering, Kyoto University, Yoshida, Sakyo, Kyoto 606-8501, Japan
Koichi Ichimiya
Department of Research Interdisciplinary Graduate School of Medical and Engineering, Department of Mechanical System Engineering, University of Yamanashi, Japan

ABSTRACT

Experimental and numerical flow visualizations were performed to study the laminar mixed convection with flow reversal in a thermally developing region of a horizontal square channel. The flow reversal near the upper wall in the entrance region of the channel was visualized experimentally by means of a dye-injection method. Moreover, the three-dimensional unsteady Navier-Stokes equations were solved by using the QUICK and SIMPLE methods. We considered the effect of the physical properties of the fluid with temperatures in the numerical analysis. Experimental flow visualization and three-dimensional behavior of streamlines by numerical analysis on the flow reversal were in agreement. The effects of wall temperature and the Reynolds number on the size of the separation region were also examined, and the three-dimensional mechanism of flow reversal was discussed.