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Experimental and tomography-based CFD investigations of the flow in open cell metal foams with application to aero engine separators

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Experimental and tomography-based CFD investigations of the flow in open cell metal foams with application to aero engine separators. / De Carvalho, Thiago P.; Morvan, Hervé P.; Hargreaves, David; Oun, Hatem; Kennedy, Andrew.

Heat Transfer. Vol. 5C American Society of Mechanical Engineers (ASME), 2015. GT2015-43509.

Research output: Contribution in Book/Report/Proceedings - With ISBN/ISSNConference contribution/Paperpeer-review

Harvard

De Carvalho, TP, Morvan, HP, Hargreaves, D, Oun, H & Kennedy, A 2015, Experimental and tomography-based CFD investigations of the flow in open cell metal foams with application to aero engine separators. in Heat Transfer. vol. 5C, GT2015-43509, American Society of Mechanical Engineers (ASME), ASME Turbo Expo 2015: Turbine Technical Conference and Exposition, GT 2015, Montreal, Canada, 15/06/15. https://doi.org/10.1115/GT2015-43509

APA

De Carvalho, T. P., Morvan, H. P., Hargreaves, D., Oun, H., & Kennedy, A. (2015). Experimental and tomography-based CFD investigations of the flow in open cell metal foams with application to aero engine separators. In Heat Transfer (Vol. 5C). [GT2015-43509] American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/GT2015-43509

Vancouver

De Carvalho TP, Morvan HP, Hargreaves D, Oun H, Kennedy A. Experimental and tomography-based CFD investigations of the flow in open cell metal foams with application to aero engine separators. In Heat Transfer. Vol. 5C. American Society of Mechanical Engineers (ASME). 2015. GT2015-43509 https://doi.org/10.1115/GT2015-43509

Author

De Carvalho, Thiago P. ; Morvan, Hervé P. ; Hargreaves, David ; Oun, Hatem ; Kennedy, Andrew. / Experimental and tomography-based CFD investigations of the flow in open cell metal foams with application to aero engine separators. Heat Transfer. Vol. 5C American Society of Mechanical Engineers (ASME), 2015.

Bibtex

@inproceedings{add0241d5201459499555457602ecbdf,
title = "Experimental and tomography-based CFD investigations of the flow in open cell metal foams with application to aero engine separators",
abstract = "Oil-air separation is a key function in aero engines with closed-loop oil systems. Typically, aero engine air/oil separators employ the use of a porous medium such as open cell metal foams, as a secondary separation mechanism. Assessing its impact on overall separation is important since non-captured oil is released overboard. Computational fluid dynamics offers a possibility to evaluate the metal foam separation effectiveness. A pore scale numerical modelling methodology is applied to determine the transport properties of fluid flow through open cell metal foams. Microcomputer tomography scans were used to generate a 3D digital representation of commercial open cell metal foams of different grades. Foam structural properties such as porosity, specific surface, pore size distribution and the minimum size of a representative elementary volume are directly extracted from the CT scans. Subsequently, conventional finite volume simulations are carried out on the realistic tomography based foam samples. Simulations were performed for a wide range of Reynolds numbers. The feasibility of using standard Reynolds-averaged Navier-Stokes (RANS) turbulence models is investigated here. As part of the method validation, samples with varying lengths were simulated. Pressure drop values were compared on a length-normalized basis against in-house experimental data. The oil phase was modelled using a Lagrangian particle tracking approach. Boundary conditions for the oil phase were extracted from a previous CFD simulation of a full breather device in the ground idle regime (worst separation effectiveness). Steady state particle tracking simulations were run for droplet diameters ranging from 0.5-15 μm, and for flow inlet velocities ranging from 10 - 60 m/s. Stochastic tracking was taken into account in order to model the effects of turbulence on the particle trajectories. Simulations were run on different types of foam and the results are compared qualitatively. The procedure has shown that pore scale modelling is a valid tool to capture the flow field and model oil separation inside open cell metal foams. However, at the moment there is no experimental data available for validation of the oil phase modelling.",
author = "{De Carvalho}, {Thiago P.} and Morvan, {Herv{\'e} P.} and David Hargreaves and Hatem Oun and Andrew Kennedy",
year = "2015",
doi = "10.1115/GT2015-43509",
language = "English",
volume = "5C",
booktitle = "Heat Transfer",
publisher = "American Society of Mechanical Engineers (ASME)",
note = "ASME Turbo Expo 2015: Turbine Technical Conference and Exposition, GT 2015 ; Conference date: 15-06-2015 Through 19-06-2015",

}

RIS

TY - GEN

T1 - Experimental and tomography-based CFD investigations of the flow in open cell metal foams with application to aero engine separators

AU - De Carvalho, Thiago P.

AU - Morvan, Hervé P.

AU - Hargreaves, David

AU - Oun, Hatem

AU - Kennedy, Andrew

PY - 2015

Y1 - 2015

N2 - Oil-air separation is a key function in aero engines with closed-loop oil systems. Typically, aero engine air/oil separators employ the use of a porous medium such as open cell metal foams, as a secondary separation mechanism. Assessing its impact on overall separation is important since non-captured oil is released overboard. Computational fluid dynamics offers a possibility to evaluate the metal foam separation effectiveness. A pore scale numerical modelling methodology is applied to determine the transport properties of fluid flow through open cell metal foams. Microcomputer tomography scans were used to generate a 3D digital representation of commercial open cell metal foams of different grades. Foam structural properties such as porosity, specific surface, pore size distribution and the minimum size of a representative elementary volume are directly extracted from the CT scans. Subsequently, conventional finite volume simulations are carried out on the realistic tomography based foam samples. Simulations were performed for a wide range of Reynolds numbers. The feasibility of using standard Reynolds-averaged Navier-Stokes (RANS) turbulence models is investigated here. As part of the method validation, samples with varying lengths were simulated. Pressure drop values were compared on a length-normalized basis against in-house experimental data. The oil phase was modelled using a Lagrangian particle tracking approach. Boundary conditions for the oil phase were extracted from a previous CFD simulation of a full breather device in the ground idle regime (worst separation effectiveness). Steady state particle tracking simulations were run for droplet diameters ranging from 0.5-15 μm, and for flow inlet velocities ranging from 10 - 60 m/s. Stochastic tracking was taken into account in order to model the effects of turbulence on the particle trajectories. Simulations were run on different types of foam and the results are compared qualitatively. The procedure has shown that pore scale modelling is a valid tool to capture the flow field and model oil separation inside open cell metal foams. However, at the moment there is no experimental data available for validation of the oil phase modelling.

AB - Oil-air separation is a key function in aero engines with closed-loop oil systems. Typically, aero engine air/oil separators employ the use of a porous medium such as open cell metal foams, as a secondary separation mechanism. Assessing its impact on overall separation is important since non-captured oil is released overboard. Computational fluid dynamics offers a possibility to evaluate the metal foam separation effectiveness. A pore scale numerical modelling methodology is applied to determine the transport properties of fluid flow through open cell metal foams. Microcomputer tomography scans were used to generate a 3D digital representation of commercial open cell metal foams of different grades. Foam structural properties such as porosity, specific surface, pore size distribution and the minimum size of a representative elementary volume are directly extracted from the CT scans. Subsequently, conventional finite volume simulations are carried out on the realistic tomography based foam samples. Simulations were performed for a wide range of Reynolds numbers. The feasibility of using standard Reynolds-averaged Navier-Stokes (RANS) turbulence models is investigated here. As part of the method validation, samples with varying lengths were simulated. Pressure drop values were compared on a length-normalized basis against in-house experimental data. The oil phase was modelled using a Lagrangian particle tracking approach. Boundary conditions for the oil phase were extracted from a previous CFD simulation of a full breather device in the ground idle regime (worst separation effectiveness). Steady state particle tracking simulations were run for droplet diameters ranging from 0.5-15 μm, and for flow inlet velocities ranging from 10 - 60 m/s. Stochastic tracking was taken into account in order to model the effects of turbulence on the particle trajectories. Simulations were run on different types of foam and the results are compared qualitatively. The procedure has shown that pore scale modelling is a valid tool to capture the flow field and model oil separation inside open cell metal foams. However, at the moment there is no experimental data available for validation of the oil phase modelling.

U2 - 10.1115/GT2015-43509

DO - 10.1115/GT2015-43509

M3 - Conference contribution/Paper

AN - SCOPUS:84954350463

VL - 5C

BT - Heat Transfer

PB - American Society of Mechanical Engineers (ASME)

T2 - ASME Turbo Expo 2015: Turbine Technical Conference and Exposition, GT 2015

Y2 - 15 June 2015 through 19 June 2015

ER -