Convection flows driven by laser heating of a liquid layer

Article English OPEN
Rivière , David ; Selva , Bertrand ; Chraibi , Hamza ; Delabre , Ulysse ; Delville , Jean-Pierre (2016)
  • Publisher: American Physical Society (APS)
  • Related identifiers: doi: 10.1103/PhysRevE.93.023112
  • Subject: [ PHYS.COND.CM-SCM ] Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft]
    arxiv: Physics::Fluid Dynamics

International audience; When a fluid is heated by the absorption of a continuous laser wave, the fluid density decreases in the heated area. This induces a pressure gradient that generates internal motion of the fluid. Due to mass conservation, convection eddies emerge in the sample. To investigate these laser-driven bulk flows at the microscopic scale, we built a setup to perform temperature measurements with a fluorescent-sensitive dye on the one hand, and measured the flow pattern at different beam powers, using a particle image velocimetry technique on the other hand. Temperature measurements were also used in numerical simulations in order to compare predictions to the experimental velocity profiles. The combination of our numerical and experimental approaches allows a detailed description of the convection flows induced by the absorption of light, which reveals a transition between a thin and a thick liquid layer regime. This supports the basis of optothermal approaches for microfluidic applications.
  • References (28)
    28 references, page 1 of 3

    4. Linear behavior of Tmax with Pabs power Pabs described in Sec. II B, Fig. 3(a). We then plotted separately on Fig. 12 the variation Tmax with Pabs at low powers for each thickness. We added on this figure the uncertainties on temperature measurements deduced from the Lorentzian fit. The linear behavior at small Pabs appears clearly for the three investegated thicknesses. We found Tmax = 1.9 ± 0.3 ◦C/mW for H = 185 μm (a), 1.5 ± 0.2 ◦C/mW for H = 310 μm (b) and 1.6 ± 0.2 ◦C/mW for H = 480 μm (c).

    [1] H. Be´nard, J. Phys. Theor. Appl. 10, 254 (1901).

    [2] L. Rayleigh, London, Edinburgh, Dublin Philos. Mag. J. Sci. 32, 529 (1916).

    [3] R. V. Birikh, J. Appl. Mech. Tech. Phys. 7, 43 (1966).

    [4] F. M. Weinert and D. Braun, Nano Lett. 9, 4264 (2009).

    [5] D. E. Cormack, L. G. Leal, and J. Imberger, J. Fluid Mech. 65, 209 (1974).

    [6] D. E. Cormack, L. G. Leal, and J. H. Seinfeld, J. Fluid Mech. 65, 231 (1974).

    [7] J. Imberger, J. Fluid Mech. 65, 247 (1974).

    [8] D. Braun and A. Libchaber, Phys. Rev. Lett. 89, 188103 (2002).

    [9] S. Fayolle, T. Bickel, and A. Wu¨rger, Phys. Rev. E 77, 041404 (2008).

  • Metrics
    No metrics available
Share - Bookmark