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Promotion and control of turbulent thermal mixing in T-junction with delta wings

DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.2340
pages 2277-2288

Masafumi Hirota
Department of Micro-Nano Systems Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603; Department of Mechanical Engineering, Mie University, Kurimamachiya-cho 1577, Tsu-city 514-850

T. Miyakoshi
Mie Plant, Fuji Electric Retail System, Fuji-cho, Yokkaichi 510-8631, Japan

H. Asano
Nagoya University, Nagoya; and Air-Conditioning Testing and Evaluation Department, DENSO CORPORATION, Showa-cho, Kariya 448-8661

E. Mohri
Department of Mechanical Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603; Osaka Plant, KOMATSU, Ueno, Hirakata, Osaka 573-1011, Japan

S. Hori
Department of Mechanical Engineering, Mie University, Kurimamachiya-cho,Tsu-city 514-8507, Japan

N. Maruyama
Department of Mechanical Engineering, Mie University, Kurimamachiya-cho,Tsu-city 514-8507, Japan

A. Nishimura
Department of Mechanical Engineering, Mie University, Kurimamachiya-cho,Tsu-city 514-8507, Japan


An Experimental study was made on the promotion and control of turbulent mixing of hot and cold airflows in a T-junction with rectangular cross sections, which simulated an HVAC unit for an automobile air-conditioning system. Delta wings were used as devices to promote and control the turbulent thermal mixing. The mean temperature and velocity distributions in several cross sections were measured by thermocouples and PIV, respectively. It was found that the development of the thermal mixing layer is promoted by the delta wings and the degree of thermal mixing can be controlled by changing their angle of attack. The longitudinal vortices produced by the wings breaks after the merging of two flows, but their influence on the thermal mixing layer is maintained to further downstream cross sections.

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