An Original Combined Multiphase Model of the Steam-Explosion Premixing Phase

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LESKOVAR, Matjaž ;MAVKO, Borut .
An Original Combined Multiphase Model of the Steam-Explosion Premixing Phase. 
Strojniški vestnik - Journal of Mechanical Engineering, [S.l.], v. 48, n.8, p. 438-448, july 2017. 
ISSN 0039-2480.
Available at: <https://www.sv-jme.eu/sl/article/an-original-combined-multiphase-model-of-the-steam-explosion-premixing-phase/>. Date accessed: 15 aug. 2020. 
doi:http://dx.doi.org/.
Leskovar, M., & Mavko, B.
(2002).
An Original Combined Multiphase Model of the Steam-Explosion Premixing Phase.
Strojniški vestnik - Journal of Mechanical Engineering, 48(8), 438-448.
doi:http://dx.doi.org/
@article{.,
	author = {Matjaž  Leskovar and Borut  Mavko},
	title = {An Original Combined Multiphase Model of the Steam-Explosion Premixing Phase},
	journal = {Strojniški vestnik - Journal of Mechanical Engineering},
	volume = {48},
	number = {8},
	year = {2002},
	keywords = {multiphase flow; multiphase models; steam explosion; level set methods; simulations; },
	abstract = {In multiphase flow, different phase distributions can occur that cannot be adequately modeled with just free-surface models or with just multiphase models. Such a distribution of phases occurs, for example, in isothermal steam-explosion premixing experiments, where dispersed spheres penetrate the water and the water-air surface remains sharp. A common practice when modeling isothermal premixing experiments is to treat all three phases involved the water, the air and the spheres’ phase equally, with multiphase flow models. In this way the water-air surface is treated as a dispersed flow of bubbles in water or droplets in air, which is a physically incorrect picture and because of very strong momentum-coupling terms also numerically not an easily solvable problem. Therefore, we decided to develop an original, combined multiphase model, where the spheres are treated, as is usual, with a multiphase flow model, whereas the water-air surface is treated with a free-surface model. The QUEOS isothermal premixing experiment Q08 was simulated with the developed combined multiphase model. A crucial part in isothermal premixing experiment simulations is the correct prediction of the gas chimney, which forms during the spheres’ penetration into the water. To get a better understanding of the gas-chimney formation an extensive parametric analysis (mesh size, initial water-air surface thickness, water density, interfacial momentum-coupling starting position) was performed. We established that the right gas-chimney formation can be obtained if a special spheres’ drag treatment at the water-air surface, which considers the discontinuous air-water transition, is incorporated into the model.},
	issn = {0039-2480},	pages = {438-448},	doi = {},
	url = {https://www.sv-jme.eu/sl/article/an-original-combined-multiphase-model-of-the-steam-explosion-premixing-phase/}
}
Leskovar, M.,Mavko, B.
2002 July 48. An Original Combined Multiphase Model of the Steam-Explosion Premixing Phase. Strojniški vestnik - Journal of Mechanical Engineering. [Online] 48:8
%A Leskovar, Matjaž 
%A Mavko, Borut 
%D 2002
%T An Original Combined Multiphase Model of the Steam-Explosion Premixing Phase
%B 2002
%9 multiphase flow; multiphase models; steam explosion; level set methods; simulations; 
%! An Original Combined Multiphase Model of the Steam-Explosion Premixing Phase
%K multiphase flow; multiphase models; steam explosion; level set methods; simulations; 
%X In multiphase flow, different phase distributions can occur that cannot be adequately modeled with just free-surface models or with just multiphase models. Such a distribution of phases occurs, for example, in isothermal steam-explosion premixing experiments, where dispersed spheres penetrate the water and the water-air surface remains sharp. A common practice when modeling isothermal premixing experiments is to treat all three phases involved the water, the air and the spheres’ phase equally, with multiphase flow models. In this way the water-air surface is treated as a dispersed flow of bubbles in water or droplets in air, which is a physically incorrect picture and because of very strong momentum-coupling terms also numerically not an easily solvable problem. Therefore, we decided to develop an original, combined multiphase model, where the spheres are treated, as is usual, with a multiphase flow model, whereas the water-air surface is treated with a free-surface model. The QUEOS isothermal premixing experiment Q08 was simulated with the developed combined multiphase model. A crucial part in isothermal premixing experiment simulations is the correct prediction of the gas chimney, which forms during the spheres’ penetration into the water. To get a better understanding of the gas-chimney formation an extensive parametric analysis (mesh size, initial water-air surface thickness, water density, interfacial momentum-coupling starting position) was performed. We established that the right gas-chimney formation can be obtained if a special spheres’ drag treatment at the water-air surface, which considers the discontinuous air-water transition, is incorporated into the model.
%U https://www.sv-jme.eu/sl/article/an-original-combined-multiphase-model-of-the-steam-explosion-premixing-phase/
%0 Journal Article
%R 
%& 438
%P 11
%J Strojniški vestnik - Journal of Mechanical Engineering
%V 48
%N 8
%@ 0039-2480
%8 2017-07-07
%7 2017-07-07
Leskovar, Matjaž, & Borut  Mavko.
"An Original Combined Multiphase Model of the Steam-Explosion Premixing Phase." Strojniški vestnik - Journal of Mechanical Engineering [Online], 48.8 (2002): 438-448. Web.  15 Aug. 2020
TY  - JOUR
AU  - Leskovar, Matjaž 
AU  - Mavko, Borut 
PY  - 2002
TI  - An Original Combined Multiphase Model of the Steam-Explosion Premixing Phase
JF  - Strojniški vestnik - Journal of Mechanical Engineering
DO  - 
KW  - multiphase flow; multiphase models; steam explosion; level set methods; simulations; 
N2  - In multiphase flow, different phase distributions can occur that cannot be adequately modeled with just free-surface models or with just multiphase models. Such a distribution of phases occurs, for example, in isothermal steam-explosion premixing experiments, where dispersed spheres penetrate the water and the water-air surface remains sharp. A common practice when modeling isothermal premixing experiments is to treat all three phases involved the water, the air and the spheres’ phase equally, with multiphase flow models. In this way the water-air surface is treated as a dispersed flow of bubbles in water or droplets in air, which is a physically incorrect picture and because of very strong momentum-coupling terms also numerically not an easily solvable problem. Therefore, we decided to develop an original, combined multiphase model, where the spheres are treated, as is usual, with a multiphase flow model, whereas the water-air surface is treated with a free-surface model. The QUEOS isothermal premixing experiment Q08 was simulated with the developed combined multiphase model. A crucial part in isothermal premixing experiment simulations is the correct prediction of the gas chimney, which forms during the spheres’ penetration into the water. To get a better understanding of the gas-chimney formation an extensive parametric analysis (mesh size, initial water-air surface thickness, water density, interfacial momentum-coupling starting position) was performed. We established that the right gas-chimney formation can be obtained if a special spheres’ drag treatment at the water-air surface, which considers the discontinuous air-water transition, is incorporated into the model.
UR  - https://www.sv-jme.eu/sl/article/an-original-combined-multiphase-model-of-the-steam-explosion-premixing-phase/
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	author = {Leskovar, M., Mavko, B.},
	title = {An Original Combined Multiphase Model of the Steam-Explosion Premixing Phase},
	journal = {Strojniški vestnik - Journal of Mechanical Engineering},
	volume = {48},
	number = {8},
	year = {2002},
	doi = {},
	url = {https://www.sv-jme.eu/sl/article/an-original-combined-multiphase-model-of-the-steam-explosion-premixing-phase/}
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TY  - JOUR
AU  - Leskovar, Matjaž 
AU  - Mavko, Borut 
PY  - 2017/07/07
TI  - An Original Combined Multiphase Model of the Steam-Explosion Premixing Phase
JF  - Strojniški vestnik - Journal of Mechanical Engineering; Vol 48, No 8 (2002): Strojniški vestnik - Journal of Mechanical Engineering
DO  - 
KW  - multiphase flow, multiphase models, steam explosion, level set methods, simulations, 
N2  - In multiphase flow, different phase distributions can occur that cannot be adequately modeled with just free-surface models or with just multiphase models. Such a distribution of phases occurs, for example, in isothermal steam-explosion premixing experiments, where dispersed spheres penetrate the water and the water-air surface remains sharp. A common practice when modeling isothermal premixing experiments is to treat all three phases involved the water, the air and the spheres’ phase equally, with multiphase flow models. In this way the water-air surface is treated as a dispersed flow of bubbles in water or droplets in air, which is a physically incorrect picture and because of very strong momentum-coupling terms also numerically not an easily solvable problem. Therefore, we decided to develop an original, combined multiphase model, where the spheres are treated, as is usual, with a multiphase flow model, whereas the water-air surface is treated with a free-surface model. The QUEOS isothermal premixing experiment Q08 was simulated with the developed combined multiphase model. A crucial part in isothermal premixing experiment simulations is the correct prediction of the gas chimney, which forms during the spheres’ penetration into the water. To get a better understanding of the gas-chimney formation an extensive parametric analysis (mesh size, initial water-air surface thickness, water density, interfacial momentum-coupling starting position) was performed. We established that the right gas-chimney formation can be obtained if a special spheres’ drag treatment at the water-air surface, which considers the discontinuous air-water transition, is incorporated into the model.
UR  - https://www.sv-jme.eu/sl/article/an-original-combined-multiphase-model-of-the-steam-explosion-premixing-phase/
Leskovar, Matjaž, AND Mavko, Borut.
"An Original Combined Multiphase Model of the Steam-Explosion Premixing Phase" Strojniški vestnik - Journal of Mechanical Engineering [Online], Volume 48 Number 8 (07 July 2017)

Avtorji

Inštitucije

  • Institute Jožef Štefan, Ljubljana, Slovenia
  • Institute Jožef Štefan, Ljubljana, Slovenia

Informacije o papirju

Strojniški vestnik - Journal of Mechanical Engineering 48(2002)8, 438-448

In multiphase flow, different phase distributions can occur that cannot be adequately modeled with just free-surface models or with just multiphase models. Such a distribution of phases occurs, for example, in isothermal steam-explosion premixing experiments, where dispersed spheres penetrate the water and the water-air surface remains sharp. A common practice when modeling isothermal premixing experiments is to treat all three phases involved the water, the air and the spheres’ phase equally, with multiphase flow models. In this way the water-air surface is treated as a dispersed flow of bubbles in water or droplets in air, which is a physically incorrect picture and because of very strong momentum-coupling terms also numerically not an easily solvable problem. Therefore, we decided to develop an original, combined multiphase model, where the spheres are treated, as is usual, with a multiphase flow model, whereas the water-air surface is treated with a free-surface model. The QUEOS isothermal premixing experiment Q08 was simulated with the developed combined multiphase model. A crucial part in isothermal premixing experiment simulations is the correct prediction of the gas chimney, which forms during the spheres’ penetration into the water. To get a better understanding of the gas-chimney formation an extensive parametric analysis (mesh size, initial water-air surface thickness, water density, interfacial momentum-coupling starting position) was performed. We established that the right gas-chimney formation can be obtained if a special spheres’ drag treatment at the water-air surface, which considers the discontinuous air-water transition, is incorporated into the model.

multiphase flow; multiphase models; steam explosion; level set methods; simulations;