Studies of Heat Transfer Control by Using Jet Discharge at Reattachment Region Downstream of a Backward-Facing Step. 1st Report. Effect of Jet Locations and Jet Volocities.
Year: 1993
Type: article
Abstract: The local heat transfer coefficients downstream of a backward-facing step were measured at various jet locations and jet velocities by discharging a jet perpendicularly to the main flow to control the heat transfer characteristics. It was found that flow field is characterized by the formation of a circulating bubble at the rear of a jet port on the opposite wall of the step surface (i.e., the jet port side), where the bubble causes acceleration of the main flow and shortening of the reattachment point length. Furthermore, at the optimum position X_j/H=2. 1(X_j : location of jet, measured from the step)position, H : the step height), the augmentation of mean heat transfer coefficients can be as much as 1. 6 times the value without jet discharge. Thus, by using a jet it is possible to control the heat transfer effectively.
Authors: Kenyu Oyakawa, Toru Koike, Ikuo Mabuchi
Language: English
Topic: Heat Transfer Mechanisms
Subfield: Mechanical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W199042541