Abstract
Momentum exchange coefficient (K) is a crucial parameter for the mixing process of two jet flows. In this paper, the momentum exchange coefficient for two jet flows mixing in a tee junction was investigated with air-air, water-water and water-air system in a wide region of mass flow ratio. The pressure drop of two jets mixing in a tee junction was analyzed according to the flow characteristics. It was considered that the total pressure drop mainly included the pressure drop of momentum exchange and the pressure drop of friction. Based on the pressure drop data measured in this study, the pressure drops due to momentum exchange were obtained by the extrapolation method, and then the momentum exchange coefficient was calculated. The results show that, the momentum exchange coefficient was mainly dependent on the momentum flux ratio (M) of the two jets and almost independent with the physical properties of jet flows. The relationship between K and M is correlated with the following equation: $$ K = 1 + 0.236M^{0.25} $$ .
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