Non-Oberbeck-Boussinesq Effects in Gaseous Rayleigh-Bénard Convection

Günter Ahlers, F. Fontenele Araujo Junior, Denis Funfschilling, Siegfried Grossmann, Detlef Lohse

Research output: Contribution to journalArticleAcademicpeer-review

47 Citations (Scopus)
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Abstract

Non-Oberbeck-Boussinesq (NOB) effects are measured experimentally and calculated theoretically for strongly turbulent Rayleigh-Be´nard convection of ethane gas under pressure where the material properties strongly depend on the temperature. Relative to the Oberbeck-Boussinesq case we find a decrease of the central temperature as compared to the arithmetic mean of the top- and bottom-plate temperature and an increase of the Nusselt number. Both effects are of opposite sign and greater magnitude than those for NOB convection in liquids like water.
Original languageUndefined
Pages (from-to)054501-1-051501-4
Number of pages4
JournalPhysical review letters
Volume98
Issue number5
DOIs
Publication statusPublished - 2007

Keywords

  • IR-58976
  • METIS-237122

Cite this

Ahlers, G., Fontenele Araujo Junior, F., Funfschilling, D., Grossmann, S., & Lohse, D. (2007). Non-Oberbeck-Boussinesq Effects in Gaseous Rayleigh-Bénard Convection. Physical review letters, 98(5), 054501-1-051501-4. https://doi.org/10.1103/PhysRevLett.98.054501
Ahlers, Günter ; Fontenele Araujo Junior, F. ; Funfschilling, Denis ; Grossmann, Siegfried ; Lohse, Detlef. / Non-Oberbeck-Boussinesq Effects in Gaseous Rayleigh-Bénard Convection. In: Physical review letters. 2007 ; Vol. 98, No. 5. pp. 054501-1-051501-4.
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Ahlers, G, Fontenele Araujo Junior, F, Funfschilling, D, Grossmann, S & Lohse, D 2007, 'Non-Oberbeck-Boussinesq Effects in Gaseous Rayleigh-Bénard Convection', Physical review letters, vol. 98, no. 5, pp. 054501-1-051501-4. https://doi.org/10.1103/PhysRevLett.98.054501

Non-Oberbeck-Boussinesq Effects in Gaseous Rayleigh-Bénard Convection. / Ahlers, Günter; Fontenele Araujo Junior, F.; Funfschilling, Denis; Grossmann, Siegfried; Lohse, Detlef.

In: Physical review letters, Vol. 98, No. 5, 2007, p. 054501-1-051501-4.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Non-Oberbeck-Boussinesq Effects in Gaseous Rayleigh-Bénard Convection

AU - Ahlers, Günter

AU - Fontenele Araujo Junior, F.

AU - Funfschilling, Denis

AU - Grossmann, Siegfried

AU - Lohse, Detlef

PY - 2007

Y1 - 2007

N2 - Non-Oberbeck-Boussinesq (NOB) effects are measured experimentally and calculated theoretically for strongly turbulent Rayleigh-Be´nard convection of ethane gas under pressure where the material properties strongly depend on the temperature. Relative to the Oberbeck-Boussinesq case we find a decrease of the central temperature as compared to the arithmetic mean of the top- and bottom-plate temperature and an increase of the Nusselt number. Both effects are of opposite sign and greater magnitude than those for NOB convection in liquids like water.

AB - Non-Oberbeck-Boussinesq (NOB) effects are measured experimentally and calculated theoretically for strongly turbulent Rayleigh-Be´nard convection of ethane gas under pressure where the material properties strongly depend on the temperature. Relative to the Oberbeck-Boussinesq case we find a decrease of the central temperature as compared to the arithmetic mean of the top- and bottom-plate temperature and an increase of the Nusselt number. Both effects are of opposite sign and greater magnitude than those for NOB convection in liquids like water.

KW - IR-58976

KW - METIS-237122

U2 - 10.1103/PhysRevLett.98.054501

DO - 10.1103/PhysRevLett.98.054501

M3 - Article

VL - 98

SP - 054501-1-051501-4

JO - Physical review letters

JF - Physical review letters

SN - 0031-9007

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Ahlers G, Fontenele Araujo Junior F, Funfschilling D, Grossmann S, Lohse D. Non-Oberbeck-Boussinesq Effects in Gaseous Rayleigh-Bénard Convection. Physical review letters. 2007;98(5):054501-1-051501-4. https://doi.org/10.1103/PhysRevLett.98.054501