Dew Droplets and Cloud Droplets: Droplet Growth, Size Distributions, and Corrections to Scaling

演講題目： Dew Droplets and Cloud Droplets: Droplet Growth, Size Distributions, and Corrections to Scaling 演講人： Prof. Dr. Jürgen Vollmer Max-Planck-Institut für Dynamik und Selbstorganisation, G枚ttingen Fakult盲t f眉r Physik, Georg-August Universit盲t G枚ttingen 鎶ュ憡鏃堕棿锛� 7鏈�10鏃ワ紙鏄熸湡涓夛級涓婂崍鍗佺偣鎶ュ憡鍦扮偣锛� 鐗╃悊绯諱笁妤兼姤鍛婂巺鎽樿锛� I present the results of comprehensive laboratory experiments and numerical studies addressing droplet growth and droplet size distributions in systems where droplets grow due to sustained supersaturation of their environment.
Both, for droplets condensing on a substrate (like dew) and droplets entrained in an external flow (like in clouds), we observe remarkable shortcomings of classical scaling theories addressing these growth processes. The origins of the discrepancies are identified, and appropriate extensions of the theories are discussed.
The issues about droplet distributions in the atmosphere might have some relevance to climate studies on earth. However, they are potentially much more useful for the description of atmospheres of brown stars and exo-planets. 涓漢绠�鍘嗭細 Since April 2007 I am a senior scientist in the Department Dynamics of Complex Fluids at the Max Planck Institute for Dynamics and Self-Organization (MPI DS), and since December 2009 I also hold an appointment as an Associate (鈥渁u脽erplanm盲脽iger鈥�) Professor at the Faculty of Physics of the Georg-August-Universit盲t G枚ttingen. At the MPI DS I run a group of about ten scientists with whom I am working on problems in stochastic thermodynamics, on the ergodic theory of granular matter, and on instabilities and finite time singularities arising in the dynamics of phase separation. As far as applications are concerned I am involved in a European Research network addressing particle dynamics in turbulent flows (MPNS COST Action MP0806 Particles in turbulence), and a BP funded center of excellence addressing multiphase flow through porous media (GeoMorph 鈥� G枚ttingen exploration of Microscale oil reservoir physics).