Author(s)

Kyoji Inaoka, Jiro Yamamoto & Kenjiro Suzuki

Abstract

Unsteady flow and heat transfer characteristics were studied numerically for a flat plate laminar boundary layer disturbed by a square rod. Flow becomes unsteady when the space between the rod and the wall is increased. Heat transfer enhancement was obtained on the flat plate downstream of the squara; rod while skin friction is deteriorated, thus, dissimilarity between the momentum transfer and heat transfer can be generated. The mechanism of this dissimilarity is strongly related to the behavior of the Karman-like vortex, i.e. wavering motion of the separation vorticity layers formed from both sides of the square rod periodically produces an isolated vortex island from the lifted tip of the wall vorticity layer. This isolated vortex induces the clockwise fluid motion which supplies cold fresh fluid of the mam stream region into

Keywords