斜め衝突噴流により誘起される縦渦を伴うダクト内流れの伝熱特性 : 第1報, 感温液晶を利用した壁面熱伝達率測定

概要

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Heat transfer measurements were carried out for an inclined impinging jet into a crossflow. Surface temperatures of a heat transfer target wall were measured using thermochromic liquid crystal sheets. Neural network method was applied to conversion of the colors of the liquid crystal sheet images into the temperatures. The inclined jet is characterized by the following two angles ; one is a pitch angle measured up from the jet-installed wall and the other a skew angle measured from the crossflow direction. The flow configuration of this experimental apparatus was designed in the new idea that longitudinal vortices could be generated by the inclined impinging jet into the crossflow to enhance heat transfer from the target surface. It was demonstrated that heat transfer enhancement was attained over wider spanwise region when the ratio of the jet velocity to the crossflow velocity is increased, and that peak Nusselt numbers appeared around z/d=5 constantly regardless of the velocity ratio.
1998-03-25