3D Numerical Investigation of Elliptical Orifices Effect with Different Aspect Ratios on Liquid Jet Breakup

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Nasiri, Mohammad Mahdi | 2014

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 47184 (45)
University: Sharif University of Technology
Department: Aerospace Engineering
Advisor(s): Morad, Mohammad Reza
Abstract:
In this research, the numerical simulation of liquid jet ejecting for a series of elliptical orifices into gaseous phase with different aspect ratios, at Rayleigh flow regime and in a range of Weber numbers has been performed.
For simulations, the OpenFoam software was utilized, which its multiphase flow simulation solvers are based on volume of fluid (VOF) method. In order to achieve the most accurate results for axis-switching phenomenon and jet breakup length, the dynamic mesh refinement was used for all the examined cases. The results, which were validated with recent experimental and numerical works, indicate that jet breakup length raises by increasing Weber number from 20 to 300. Also, it has been shown that jet breakup length declines as the aspect ratio of orifices decreases. In addition, the circular jet simulation with applying initial axisymmetric perturbations was carried out, which shows decline in jet breakup with increasing perturbation’s amplitude. Moreover, the most effective wave length for several perturbations was calculated. At the end, by combining both cases, the perturbations were applied for elliptic jets and the effects of perturbations were investigated
Keywords:
Numerical Simulation ; Liquid Jet ; Axis-Switching ; Jet Breakup Length ; Elliptical Orifices

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