This paper reports the experimental results on turbulent mixing of hot and cold airflows in a T-junction, which simulates the HVAC unit used in an automobile air conditioning system. The flow entering the main channel from the branch is separated at the edge of the T-junction and forms a large separation bubble. Longitudinal vortices are formed around this separation bubble. In spite of such a complex flow field, the mean temperature of the mixed flow shows quite uniform distributions in the spanwise direction of the channel. It has been also found that the strong turbulence produced around the separation bubble does not contribute effectively to the thermal mixing of hot and cold airflows.

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