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CPP: Chemische Physik und Polymerphysik

CPP 13: POSTER New Experimental Techniques

CPP 13.3: Poster

Tuesday, March 28, 2006, 17:00–19:00, P3

The role of heat conducting walls in transient grating experiments — •Marianne Hartung and Werner Köhler — Physikalisches Institut, Universität Bayreuth

Laser-induced dynamic gratings are frequently employed for the measurement of heat conduction, Fickian diffusion and thermodiffusion in simple liquids and polymer solutions. We have analyzed experimentally and theoretically the systematic errors, which are caused by departures from one-dimensional heat conduction and diffusion. While the measured thermal diffusivities possibly have to be corrected for systematic errors, non one-dimensional mass diffusion has no effect on the experimentally determined mass and thermal diffusion coefficient.

M. Hartung, W. Köhler, Eur. Phys. J. E 17, 165 (2005)