Thermal noise influences fluid flow in thin films during spinodal dewetting - Condensed Matter > Soft Condensed MatterReport as inadecuate




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Abstract: Experiments on dewetting thin polymer films confirm the theoreticalprediction that thermal noise can strongly influence characteristic time-scalesof fluid flow and cause coarsening of typical length scales. Comparing theexperiments with deterministic simulations, we show that the Navier-Stokesequation has to be extended by a conserved bulk noise term to accomplish theobserved spectrum of capillary waves. Due to thermal fluctuations the spectrumchanges from an exponential to a power law decay for large wavevectors. Alsothe time evolution of the typical wavevector of unstable perturbations exhibitsnoise induced coarsening that is absent in deterministic hydrodynamic flow.



Author: R. Fetzer, M. Rauscher, R. Seemann, K. Jacobs, K. Mecke

Source: https://arxiv.org/







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