ARTICLE:

• HIGH PERFORMANCE HEAT EXCHANGER WITH OBLIQUE-WAVE WALLS  download article

Y. Suzue
The University of Tokyo, Tokyo, Japan

K. Morimoto
The University of Tokyo, Tokyo, Japan

N. Shikazono
The University of Tokyo, Tokyo, Japan

Y. Suzuki
The University of Tokyo, Tokyo, Japan

N. Kasagi
Department of Mechanical Engineering, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan

ABSTRACT

A series of numerical simulation of the convective heat transfer in a duct with obliquely wavy surfaces is carried out in order to develop high performance heat exchangers. The effects of geometrical parameters are examined to optimize the heat exchanger duct design. The heat transfer rate of the oblique-wave duct is correlated fairly well and increases with the Reynolds number based on the wave amplitude and the bulk mean velocity, while the resultant j/f factor becomes saturated due to marked increase in the pressure drag. When the duct aspect ratio is increased, the j/f factor is also increased, although the heat transfer coefficient itself is suppressed because the surface-induced secondary flow weakens. By arranging the adjacent waves in opposing oblique angles in the case of a parallel plate channel, intense secondary flow is generated. This makes the heat transfer coefficient significantly improved, whilst the j/f enhancement remains relatively small due to the large pressure drop. It is found that, at the optimal point, the proposed oblique-wave heat exchanger achieves a 16% volume reduction from the existing cross corrugated heat exchangers.

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