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An improved numerical analysis of the transient oil de-congealing process in a heat exchanger under low temperature conditions

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Abstract

In the present study, an improved heat exchanger model is proposed to efficiently analyze the cold oil removal process inside a fuel-cooled oil cooler. When exposed to low temperature condition, oil within a heat exchanger begins to congeal, preventing oil flow and causing loss of cooling. The conventional heat exchanger models, however, shows limits in reflecting the highly varying viscosity effects due to large temperature difference. To overcome this, the conventional porous media model was rewritten with the friction and Colburn j-factors that include the temperature dependent property variation. The property correction method by Shah and Sekulic [31] was added to enhance the prediction accuracy. Also, a relief valve model based on the porous media approximation is developed. The developed models were validated against the experimental data. Transient three-dimensional numerical simulations are carried out to analyze the effects of operating conditions on de-congealing phenomenon inside the FCOC.

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Abbreviations

A :

Area

ACOC:

Air cooled oil cooler

BV:

Bypass valve

RV:

Relief valve

Cp :

Specific heat

D :

Diameter

f :

Friction factor

FCOC :

Fuel cooled oil cooler

h :

Heat transfer coefficient

j :

Colburn j factor

L :

Length

Nu:

Nusselt number

p :

Pressure

Pr:

Prandtl number

q :

Heat transfer rate

Re:

Reynolds number

S :

Source term

v :

Velocity

V:

Volume

α :

Permeability

ρ :

Density

μ :

Fluid kinematic viscosity

A :

Auxiliary cell

b :

Bulk

P:

Primary cell

w:

Wall

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Acknowledgments

This work was supported by Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government (MOTIE)(20193310100050, Technology development of gas turbine blade reengineering specialized for domestic operating environment).

Author information

Authors and Affiliations

  1. School of Mechanical Engineering, Pusan National University, 2, Busandaehak-ro 63beon-gil, Busan, Korea

    Jaehyun Park, Foster Kwame Kholi, Man Yeong Ha & June Kee Min

  2. Rolls-Royce Deutschland Ltd. & Co. KG, Eschenweg 11, 15827, Blankenfelde-Mahlow, Germany

    Michael Klingsporn

  3. Rolls-Royce plc, Whittle House, WH-42-PO Box 3, Filton, BS34 Bristol, 7QE, Bristol, UK

    Jason Chetwynd-Chatwin

Authors
  1. Jaehyun Park
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  2. Foster Kwame Kholi
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  3. Michael Klingsporn
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  4. Jason Chetwynd-Chatwin
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  5. Man Yeong Ha
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  6. June Kee Min
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Corresponding authors

Correspondence to Man Yeong Ha or June Kee Min.

Additional information

Man-Yeong Ha received his B.S. degree from Pusan National University, in 1981, M.S. degree, in 1983, from Korea Advanced Institute of Science and Technology, and Ph.D. degree from Pennsylvania State University, USA in 1990. Dr. Ha is currently a Professor at the School of Mechanical Engineering at Pusan University in Busan, Korea. His research interests are focused on thermal management, computational fluid dynamics, and micro/nano fluidics.

June Kee Min received his Ph.D. degree from Korea Advanced Institute of Science and Technology, Korea, in 1999. Currently, he is a Professor at the School of Mechanical Engineering at Pusan National University in Busan, Korea. His research interest focuses on the development of advanced CFD models for various complicated flow and heat transfer problems.

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Park, J., Kholi, F.K., Klingsporn, M. et al. An improved numerical analysis of the transient oil de-congealing process in a heat exchanger under low temperature conditions. J Mech Sci Technol 35, 391–406 (2021). https://doi.org/10.1007/s12206-020-1239-4

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  • DOI: https://doi.org/10.1007/s12206-020-1239-4

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