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

Günter Ahlers; Francisco Fontenele Araujo Junior; Denis Funfschilling; Siegfried Grossmann; Detlef Lohse

doi:10.1103/PhysRevLett.98.054501

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

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

Research output: Contribution to journal › Article › Academic › peer-review

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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 language	English
Article number	054501
Number of pages	4
Journal	Physical review letters
Volume	98
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevLett.98.054501
Publication status	Published - 2007

Keywords

2020 OA procedure

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10.1103/PhysRevLett.98.054501

ArticleFinal published version, 243 KBLicence: Taverne

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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.",

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AU - Grossmann, Siegfried

AU - Lohse, Detlef

PY - 2007

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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 - 2020 OA procedure

U2 - 10.1103/PhysRevLett.98.054501

DO - 10.1103/PhysRevLett.98.054501

M3 - Article

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ER -

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

Abstract

Keywords

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