What question did this study set out to answer?

To investigate the mechanisms driving heat-transfer enhancement and flow dynamics near square-stud roughnesses in turbulent Rayleigh-Bénard convection.

January 1, 2014Physics of FluidsOpen Access

Thermal boundary layer near roughnesses in turbulent Rayleigh-Bénard convection: Flow structure and multistability

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Authors

JSJulien SalortÉcole Normale Supérieure de Lyon OLOlivier LiotCentre National de la Recherche Scientifique ERE. RusaouënInstitut Néel

Discussion

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Implication

Experimental study demonstrates enhanced heat transfer and multistability in turbulent Rayleigh-Bénard convection with surface roughness, indicating thinner boundary layers drive thermal transport.

Key Points

To investigate the mechanisms driving heat-transfer enhancement and flow dynamics near square-stud roughnesses in turbulent Rayleigh-Bénard convection.
Conducted global heat-transfer and local temperature measurements in an asymmetric parallelepiped Rayleigh-Bénard cell with controlled square-stud roughness elements.
Imaged the convective flow structures using background-oriented synthetic Schlieren visualization during enhanced regimes.
Global heat transfer is enhanced when the thermal boundary layer thickness matches the height of the roughness elements, altering the heat transfer scaling.
Local temperature measurements show that the boundary layer atop the square studs is thinner than on a smooth plate, driving the primary heat-transfer enhancement.
Identified long-timescale multistability between two enhanced heat-transfer states characterized by intermittent bursts of coherent plumes.

Cite This Study

Salort et al. (2014) studied this question.

synapsesocial.com/papers/69dcbc1da5c75be4cfe53acb https://doi.org/10.1063/1.4862487

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January 1, 2014Physics of FluidsOpen Access

Thermal boundary layer near roughnesses in turbulent Rayleigh-Bénard convection: Flow structure and multistability

View Full Paper

Ask AI

Bookmark

Authors

JSJulien SalortÉcole Normale Supérieure de Lyon OLOlivier LiotCentre National de la Recherche Scientifique ERE. RusaouënInstitut Néel

Discussion

Member takes

Implication

Experimental study demonstrates enhanced heat transfer and multistability in turbulent Rayleigh-Bénard convection with surface roughness, indicating thinner boundary layers drive thermal transport.

Key Points

To investigate the mechanisms driving heat-transfer enhancement and flow dynamics near square-stud roughnesses in turbulent Rayleigh-Bénard convection.
Conducted global heat-transfer and local temperature measurements in an asymmetric parallelepiped Rayleigh-Bénard cell with controlled square-stud roughness elements.
Imaged the convective flow structures using background-oriented synthetic Schlieren visualization during enhanced regimes.
Global heat transfer is enhanced when the thermal boundary layer thickness matches the height of the roughness elements, altering the heat transfer scaling.
Local temperature measurements show that the boundary layer atop the square studs is thinner than on a smooth plate, driving the primary heat-transfer enhancement.
Identified long-timescale multistability between two enhanced heat-transfer states characterized by intermittent bursts of coherent plumes.

Cite This Study

Salort et al. (2014) studied this question.

synapsesocial.com/papers/69dcbc1da5c75be4cfe53acb https://doi.org/10.1063/1.4862487

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