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Promotion of Turbulent Thermal Mixing of Hot and Cold Airflows in T-junction

DOI: 10.1615/ICHMT.2006.TurbulHeatMassTransf.1150
pages 549-552

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

M. Kuroki
Department of Mechanical Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan

H. Nakayama
Fuel Cell Laboratory, Daido Institute of Technology, Minami-ku, Nagoya 457-8530, Japan

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

S. Hirayama
Air-Conditioning Testing and Evaluation Department, DENSO CORPORATION, Showa-cho, Kariya 448-8661, Japan


An experimental study has been conducted on the promotion and control of turbulent thermal mixing of hot and cold airflows in a T-junction with rectangular cross sections, which simulates the HVAC unit for automobile air-conditioning system. In order to promote the turbulent thermal mixing, small jets have been blown into the main channel at the upstream edge of the T-junction in the direction of 45 degrees against the main flow. Turbulence intensity in the upper part of the thermal mixing layer can be increased with these jets, and consequently the turbulent mixing of hot and cold airflows is promoted effectively. Moreover, it has been found that the degree of thermal mixing can be controlled by changing the jet velocity.

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