Abstract
We studied, experimentally, the pattern dynamics and free surface deformation in Bénard–Marangoni convection, in a circular container (aspect ratio = 6). The free surface deformation fields were visualized by interferometry and temperature fields by infrared thermography. We considered the influence of the Marangoni (up to 2,623), Biot and Prandtl numbers. More dynamics are induced by increasing the Biot number and transition to a time-dependent flow has been observed. Conversely, increasing the Prandtl number reduces the dynamics. The deformation increases as a function of the Marangoni number until it reaches asymptotic values, which are functions of the Biot and Prandtl numbers.
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Abbreviations
- d :
-
layer depth (m)
- g :
-
acceleration due to gravity (m/s2)
- L :
-
Biot number
- Ma :
-
Marangoni number
- N c :
-
number of convective cells
- Pr :
-
Prandtl number
- R :
-
radius of the container (m)
- Ra :
-
Rayleigh number
- ΔT :
-
temperature difference applied to the liquid layer (°C)
- ΔT p :
-
temperature difference between the sapphire and the copper plate (°C)
- σ :
-
surface tension (kg/m2)
- ρ :
-
density (kg/m3)
- ν :
-
kinematic viscosity (m2/s)
- κ :
-
thermal diffusivity (m2/s)
- α :
-
expansion coefficient (K−1)
- λ :
-
thermal conductivity (W/m K)
- Γ :
-
aspect ratio
- l:
-
liquid
- g:
-
gas
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Rahal, S., Cerisier, P. & Azuma, H. Bénard–Marangoni convection in a small circular container: influence of the Biot and Prandtl numbers on pattern dynamics and free surface deformation. Exp Fluids 43, 547–554 (2007). https://doi.org/10.1007/s00348-007-0323-1
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DOI: https://doi.org/10.1007/s00348-007-0323-1