Numerical simulation of air entrainment into a mixing pipe has been performed by solving the equations of conservation of mass, momentum and energy along with a two-equation-based k–ϵ model. It was found that there exists an optimum shape of the mixing pipe (both for non-isothermal and isothermal flow condition) for maximum air entrainment into the pipe. It was also found from the numerical experiments that there exists an optimum length of the mixing pipe, both in forward and reverse direction, with respect to the position of the exit of the nozzle that can entrain maximum air into the pipe. There also exists optimum diameter of the mixing pipe and optimum distance of the nozzle from the entrance of the mixing pipe (irrespective of the different Reynolds number based on nozzle) that entrains maximum air into the pipe. For same Reynolds number, the cylindrical mixing pipe has interestingly a much shorter entrance length compared to a simple pipe. An optimum nozzle diameter could be decided by considering the mixing pipe entrainment rate and the back pressure developed by the nozzle.
Maximum air entrainment into a mixing pipe through optimum design
Ships and Offshore Structures ; 9 , 6 ; 605-618
2014-11-02
14 pages
Article (Journal)
Electronic Resource
English
mixing pipe , optimum , entrainment , nozzle , entrance length , ship
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