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OFFSET HEIGHT EFFECTS ON TURBULENT CHARACTERISTICS OF SUBMERGED JETS

Mohammad S. Rahman
Department of Mechanical Engineering, University of Manitoba, Winnipeg, Manitoba, Canada

Godwin F.K. Tay
Department of Mechanical and Manufacturing Engineering University of Manitoba Winnipeg, MB, Canada R3T 5V6

Mark F. Tachie
Department of Mechanical and Manufacturing Engineering, University of Manitoba, Winnipeg MB, R3T 5V6 Canada

Sinopsis

Experimental study of turbulent characteristics of submerged jet near the free surface was carried out at four offset height ratios of 1, 2, 3 and 4. The Reynolds number based on jet exit velocity and nozzle width was 5500. A particle image velocimetry system was used for the velocity measurement. The jet attachment length increased with the offset height. The results showed that the free surface affected the maximum velocity decay and jet spread for the shallower jets. The surface mean velocity and Reynolds normal stresses were quantified and dramatic reduction of surface-normal Reynolds normal stress than its streamwise component was observed in the interaction region. Joint probability density functions were used to investigate the contribution of the turbulent events to Reynolds shear stress.