Dresden 2009 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 17: Confined Fluids

CPP 17.5: Vortrag

Dienstag, 24. März 2009, 10:30–10:45, ZEU 160

Condensation of single drops. — •Mordechai Sokuler, Günter K. Auernhammer, and Hans-Jürgen Butt — Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz

Water condensation on surfaces, or growth of breath figures, is an important and common natural process with applications ranging from heat transfer to dew collection. Many works have detailed the growth of breath figures and their simulation. However, what has yet to be addressed comprehensively is the growth of individual, isolated droplets. Existing theory predicts drop volume increases linearly with time, between nucleation and the merging stage. We show the volumetric growth of isolated drops is much faster than predicted. Thus, the spacing of the drops becomes an important factor. And the distinction needs to be made between the growth of individual drops compared to tightly packed groups of drops. We use calculation of the concentration profiles of the two cases to predict the packing density required for each type of behaviour.