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Transport Phenomena in Thermal Engineering. Volume 2

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Department of Mechanical and Production Engineering, National University of Singapore, Kent Ridge Crescent, Singapore 0511, SINGAPORE; Department of Mechanical Engineering Faculty of Engineering, University of Indonesia, Jawa Barat, Indonesia

D. A. Shah
Department of Mechanical and Production Engineering, The National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260

Sonny H. Winoto
Department of Mechanical Engineering, National University of Singapore, Singapore 117576


Experimentally, it has been shown that two interacting equal or non-equal plane parallel turbulent jets will combine downstream, and produce resultant velocity distributions resembling those of a single jet in the self-preserved region. The objective of the present work is to analytically investigate such interaction by means of superposing the single jet solution such as that of Gortler and Reichardt. The analysis is carried out in the self-preserved region, neglecting the effects of pressure gradient and energy losses in the axial flow direction.
The analytical results obtained for the location of confluent point, the axial rate of jet spread and its development are compared with the experimental results available. The velocity profiles and the spread rate of the combined jet predicted by the analysis are in good agreement with the experimental results. However, the confluent point inferred from the analysis is grossly overpredicted. This is largely due to the fact that the axial pressure gradient is neglected in the present analysis. These results along with the effects of variation of distance between two nozzles on the confluent point and the spread rate are presented in this paper.