Experimental investigation of merging buoyant jets in a crossflow Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/gm80j008h

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  • Merging isothermal buoyant jets in a crossflow were investigated experimentally. Jets of salt water were discharged from a constant head tank into the stagnant tap water. A crossflow was simulated by towing the discharge ports through the receiving water at desired speeds. Visualization of the jet cross-sections produced by a vertical slit light source and fluorescein dye was recorded as a sequence of pictures taken by a motor-driven camera. Maximum heights, widths, and vertical cross-sections of deflected buoyant jets for different velocity ratios, number of nozzles and nozzle line orientation were plotted against downstream location. Horseshoe shaped cross section was observed and recorded in the case of single jet in crossflow and multiple jet crossflow parallel to nozzle line, while in the case of crossflow perpendicular to nozzle line horseshoe pattern was not clear. Wake behind the multiple jets in crossflow was observed and recorded, with distinct vortex street behind. Experimental results show that single jets dilute more rapidly so the cross-sections are larger and trajectories lower. Increasing velocity ratio for fixed N and θ₁ lowers the trajectories and reduces plume widths and normalized cross-sectional area; all of them appear to increase linearly with x (from x=10 D on). Increasing number of ports for fixed R and θ₁ raises the trajectories and reduces normalized cross-sectional areas rapidly. Changing the angle θ₁ between crossflow and line connecting the ports for fixed R and N strongly influences cross-sections. At θ₁ = 0⁰ vortex pair is dominant and normalized areas are the largest. At θ₁ = 45° jets are rolled in space like a band and vortex pair can be seen. At 90° vortex appears only at the lowest velocity ratio R = 0.1.
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