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NUMERICAL SIMULATION OF A TURBULENT FREE JET ISSUING FROM A RECTANGULAR NOZZLE

Volume 4, Issue 1, 2012, pp. 1-22
DOI: 10.1615/ComputThermalScien.2012003883
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ABSTRACT

The aim of this paper is to demonstrate that the simple Reynolds-averaged Navier-Stokes (RANS) two-equation standard kε turbulence model is capable of predicting the main characteristics of turbulent free jets issuing from three-dimensional complex rectangular nozzle geometry. This paper also investigates the main characteristics of turbulent rectangular free shear jets by varying the nozzle aspect ratio. The computations were performed by using RANS equations and the turbulence terms were handled by testing the standard two-equation kε or kω turbulence models. The solution of the governing equations was obtained by using the finite volume method (FVM), where the SIMPLEC algorithm was adopted with a staggered grid to prevent decoupling velocity and pressure fields. The inflow boundary conditions including the inflow velocity profile and the turbulence intensity level were adopted from published experimental data. The main results demonstrate that the standard kε model, when applied with appropriate inflow boundary conditions, provides successful predictions of the main features of turbulent free jets issuing from rectangular nozzles, including the decay rate in the near- and far-field region, the spreading rate except in the very near field, vena contracta, and axis switching. The numerical results show also that increasing the nozzle aspect ratio leads to an increase in fluid entrainment closer to the nozzle exit in the near field, which is in complete agreement with experimental observations.

CITED BY
  1. Gorman J.M., Sparrow E.M., Abraham J.P., Slot jet impingement heat transfer in the presence of jet-axis switching, International Journal of Heat and Mass Transfer, 78, 2014. Crossref

  2. Akbarzadeh Mohsen, Birouk Madjid, On the Hysteresis Phenomenon of Turbulent Lifted Diffusion Methane Flame, Flow, Turbulence and Combustion, 94, 3, 2015. Crossref

  3. Akbarzadeh Mohsen, Birouk Madjid, Liftoff of a Co-Flowing Non-Premixed Turbulent Methane Flame: Effect of the Fuel Nozzle Orifice Geometry, Flow, Turbulence and Combustion, 92, 4, 2014. Crossref

  4. Huang Wei, Ji Hong-hu, Investigation of a Two-Dimensional Hot Jet’s Infrared Radiation Using Four Different Turbulence Models, Mathematical Problems in Engineering, 2014, 2014. Crossref

  5. Ramachandran Rani Puthukulangara, Akbarzadeh Mohsen, Paliwal Jitendra, Cenkowski Stefan, Three-dimensional CFD modelling of superheated steam drying of a single distillers’ spent grain pellet, Journal of Food Engineering, 212, 2017. Crossref

  6. Akbarzadeh Mohsen, Birouk Madjid, Near-Field Characteristics of a Rectangular Jet and Its Effect on the Liftoff of Turbulent Methane Flame, Journal of Engineering for Gas Turbines and Power, 137, 8, 2015. Crossref

  7. Huang Youbo, Li Yanfeng, Dong Bingyan, Radiant Heat Flux Profile of Horizontally Oriented Rectangular Source Fuel Jet Fires, Industrial & Engineering Chemistry Research, 57, 3, 2018. Crossref

  8. Zhang Chuanzhao, Yang Xiong, Li Ziyi, Liu Yingshu, Zhao Yu, Wang Haoyu, Ma Xiaojun, Li Chunwang, Zhang Yuanhui, Experimental and Numerical Model Investigations of Oxygen-Enriched Characteristics in Air-Conditioned Rooms, Applied Sciences, 11, 11, 2021. Crossref

  9. Skotnicka-Siepsiak Aldona, Pressure distribution on a flat plate in the context of the phenomenon of the Coanda effect hysteresis, Scientific Reports, 12, 1, 2022. Crossref

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