Effect of evaporation and condensation on droplet size distribution in turbulence

  • Briti S. Deb
  • Lilya Ghazaryan
  • Bernard J. Geurts
  • Herman J. H. Clercx
  • J. G. M. Kuerten
  • Cees W. M. van der Geld
Part of the ERCOFTAC Series book series (ERCO, volume 15)

Abstract

The interaction of droplets that undergo phase transition with a turbulent flow is encountered in many areas of engineering and atmospheric science as described in (Lanotte et al., 2008). In the context of cloud physics the evaporation and condensation of water vapor from and to the droplets is the governing process for the growth of the droplets from sub micron size up to a size of around 20 μm, after which they grow mostly by coalescence until they become large enough to fall as rain drops under gravity. Much pioneering work has been done in (Luo et al., 2008; Lanotte et al., 2008; Sidin et al., 2009) on the theoretical and numerical investigation of the influence of turbulence on evaporation and condensation associated with aerosol droplets. In this paper we consider the situation of water droplets undergoing phase change and moving in air. Air also advects the vapor concentration field. We compute the natural size distribution of the droplets that arises as a result of the interaction between the droplets and the transporting turbulent flow. We assume the turbulent flow to be homogeneous and isotropic. We will perform DNS of the velocity field and the passively advected vapor and temperature field. The droplet trajectories are computed time-accurately in a domain with periodic boundary conditions.

Keywords

Probability Density Function Sherwood Number Droplet Surface Passive Scalar Droplet Temperature 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    Crowe, C., Sommerfeld, M., Tsuji,Y.: Multiphase flows with droplets and particles, CRC Press (1998) Google Scholar
  2. 2.
    Geurts, B. J.: Elements of Direct and Large-Eddy Simulation. R.T. Edwards (2004) Google Scholar
  3. 3.
    Luo, K., Desjardins, O., Pitsch, H.: DNS of droplet evaporation and combustion in a swirling combustor. Center for Turbulence Research, Annual Research Briefs (2008) Google Scholar
  4. 4.
    Lanotte, A. S., Seminara, A., Toschi, F.: Condensation of cloud microdroplets in homogeneous isotropic turbulence. arXiv, 2, 0710.3282 (2008)
  5. 5.
    Maxey, M. R., Riley, J. R.: Equation of motion for a small rigid sphere in a non uniform flow. Phys. Fluids, 26(4) (1983) Google Scholar
  6. 6.
    Sidin, R. S. R., IJzermans, R. H. A., Reeks, M. W.: A Lagrangian approach to droplet condensation in atmospheric clouds. Phys. Fluids, 21, 103303 (2009) CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • Briti S. Deb
    • 1
  • Lilya Ghazaryan
  • Bernard J. Geurts
  • Herman J. H. Clercx
  • J. G. M. Kuerten
  • Cees W. M. van der Geld
  1. 1.Multiscale Modeling and Simulation, Faculty EEMCS, J.M. Burgers CenterUniversity of TwenteEnschedeThe Netherlands

Personalised recommendations