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Numerical simulation of flow behavior in a urea liquid external gear pump with immersed solid method

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Abstract

The selective catalytic reduction (SCR) system features with integrated high-pressure urea dosing pump to regulate the urea spray injection pressure for pertinent mixing of evaporated ammonia with exhaust gas mixtures in the diesel engine. This paper is a contribution to numerical simulation studies of external gear pumps using the immersed solid method for better understanding of continuously changing fluid fields and transient flow characteristics. A comprehensive set of data gained by the investigations from KATECH institute was executed in the present study, which led to an optimized CFD setup for realistic numerical simulation. Parametric analyses have been carried out for the gear speed and supplied urea liquid mass flow rate to find the behavior of pressure, mass flow rate, and velocity fluctuations in the domain. As a result, the pressure at the outlet reached its maximum with the increase in rotational speed, and the fluctuations grew.

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Abbreviations

A :

Area, [m2]

G k :

Generation of turbulent kinetic energy, [m2/s2]

G ω :

Generation of turbulent dissipation rate, [m2/s3]

k :

Turbulent kinetic energy, [m2/s2]

p :

Pressure, [Pa]

\(\overline p \) :

Average pressure, [Pa]

t :

Time, [s]

u i, u j, u k :

Velocities along Xi, Xj, and Xk,[m/s]

\(u_i^F\) :

Immersed solid velocity, [m/s]

ρ :

Density, [kg/m3]

μ :

Dynamic viscosity, [kg/ms]

μ t :

Turbulent dynamic viscosity, [kg/ms]

γ t :

Turbulent kinematic viscosity, [m2/s]

ι :

Turbulent dissipation rate, [m2/s3]

ϕ :

Momentum source scaling factor

χ :

Forcing function of immersed solid

ψ :

Momentum source coefficient, [kg/m3]

β′, σ k, α, β, σ ω, α 3 :

Empirical constants

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Acknowledgments

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. NRF-2021R1F1A1060964) and “Research Base Construction Fund Support Program” funded by Jeonbuk National University in 2023.

Author information

Authors and Affiliations

  1. Department of Aerospace Engineering, Jeonbuk National University, Jeonbuk, 54896, Korea

    Selvakumar Kumaresh & Man Young Kim

  2. JBNU Institute for Defense Industry, Jeonbuk National University, Jeonbuk, 54896, Korea

    Man Young Kim

Authors
  1. Selvakumar Kumaresh
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  2. Man Young Kim
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Corresponding author

Correspondence to Man Young Kim.

Additional information

Selvakumar Kumaresh is the bachelor degree holder in Aeronautical Engineering from Kumaraguru College of Technology, India. After that, he received M.S. degree in Aerospace Engineering at the Jeonbuk National University. Now, he is pursuing his Ph.D. degree in Aerospace Engineering at Jeonbuk National University, Korea. His current research interests include coke oven modeling, catalytic combustion, surface chemical kinetics, and computational numerical analysis including gas turbine combustion.

Man Young Kim received his B.S. degree in Mechanical Engineering from Pusan National University, Korea in 1992. He then took his M.S. and Ph.D. degrees in Aerospace Engineering from KAIST, Korea in 1994 and 1999, respectively. Since then, he worked for Powertrain R&D Center in Hyundai Motor Company as a senior researcher up to 2004. He is currently a faculty member in the Department of Aerospace Engineering at Jeonbuk National University, Korea. He spent 1.5 years at Georgia Institute of Technology, USA as a Visiting Professor from 2009 to 2010. His research interests include propulsion and combustion, radiative heat transfer, and radiation related combustion and thermal engineering.

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Kumaresh, S., Kim, M.Y. Numerical simulation of flow behavior in a urea liquid external gear pump with immersed solid method. J Mech Sci Technol 38, 703–710 (2024). https://doi.org/10.1007/s12206-024-0120-2

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  • DOI: https://doi.org/10.1007/s12206-024-0120-2

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