An experiment of heat transfer on a wall in a laminar flow was performed by using a wall jet. The wall jet was generated by a flow control plate which was inserted into the wall. The heat transfer coefficients were measured by Mach-Zehnder interferometer. The flow pattern and velocity were measured by a smoke-wire method and laser doppler velocimeter, respectively. The height of plates (h) was varied from 2 to 8 mm. The spaces between wall and plate (c) were varied from 0 to 7.6mm. The inclined angles of plate (θ)were varied from 60 deg to -60 deg at the constant front projected height. The following results were obtained. The large plate height gave a large local heat transfer coefficient. The local heat transfer coefficients were enhanced about 7-fold of whithout plate at h=8 mm, θ=30 deg, and c/(c+h)=0.15. The optimum inclined angle of control plate for maximum local heat transfer was 30 deg, and the optimum wall jet generator angle for heat quality was -30 or -45 deg.
