title: Experimental observations of Soret-driven convection in the transient diffusive boundary layer.
abstract: The onset of transient Soret-driven convection is investigated experimentally in a colloidal suspension of thermosensitive nanoparticles by the shadowgraph technique and by particle tracking observations. From the shadowgraph images, the concentration profile is reconstructed, giving evidence of a convective motion inside the transient boundary layer. Furthermore, the latency times for the convection onset are extracted from the measurements. The results point out that particle tracking is superior to the shadowgraph method for detecting the onset of convection. The onset latency times obtained from these experiments obey scaling laws which are in accordance with the predictions from theoretical treatments.
authors: Experimentalphysik V, Universität Bayreuth, 95440 Bayreuth, Germany.
authors: Stephan
authors: S
authors: Messlinger
authors: Experimentalphysik V, Universität Bayreuth, 95440 Bayreuth, Germany.
authors: Christoph
authors: C
authors: Kramer
authors: Experimentalphysik V, Universität Bayreuth, 95440 Bayreuth, Germany.
authors: Jürgen J
authors: JJ
authors: Schmied
authors: Experimentalphysik V, Universität Bayreuth, 95440 Bayreuth, Germany.
authors: Florian
authors: F
authors: Winkel
authors: Experimentalphysik V, Universität Bayreuth, 95440 Bayreuth, Germany.
authors: Wolfgang
authors: W
authors: Schöpf
authors: Experimentalphysik V, Universität Bayreuth, 95440 Bayreuth, Germany.
authors: Ingo
authors: I
authors: Rehberg