Journal ArticleDOI
Use of dynamic schlieren interferometry to study fluctuations during free diffusion.
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TLDR
A form of schlieren interferometry is used to measure the mean-squared amplitude and temporal autocorrelation function of concentration fluctuations driven by the presence of a gradient during the free diffusion of a urea solution into water.Abstract:
We used a form of schlieren interferometry to measure the mean-squared amplitude and temporal autocorrelation function of concentration fluctuations driven by the presence of a gradient during the free diffusion of a urea solution into water. By taking and processing sequences of images separated in time by less than the shortest correlation time of interest, we were able to simultaneously measure dynamics at a number of different wave vectors. The technique is conceptually similar to the shadowgraph method, which has been used to make similar measurements, but the schlieren method has the advantage that the transfer function is wave-vector independent rather than oscillatory.read more
Citations
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Speckle contrast in near field scattering limited by time coherence
TL;DR: The relationship between the speckle contrast of scattered light in near field and longitudinal distance that is perpendicular to scattering surface is investigated and indicates that when using the laser illumination source with proper time coherence length, the curve of speckled contrast vs. longitudinal distance appears minimum turning point.
Journal ArticleDOI
Multiscale empirical mode decomposition of density fluctuation images very near above and below the critical point of SF6
TL;DR: In this article, a multiscale approach was used to investigate the dynamics of fluctuations near the critical point of sulfur hexafluoride (S F 6 ) in microgravity.
Journal ArticleDOI
Mass diffusion and Soret coefficient measurements of triethylene glycol/water binary mixtures by dynamic shadowgraphy
A. Ndjaka,L. García-Fernández,D. E. B. Bouyou,Arnault Lassin,Mohamed Azaroual,Fabrizio Croccolo,Henri Bataller +6 more
TL;DR: In this article , the authors apply the dynamic shadowgraphy optical technique to study non-equilibrium fluctuations induced by the presence of a gradient of temperature and/or concentration in the triethylene glycol (TEG)/water system.
Journal ArticleDOI
Cylindrical flowing-junction cell for the investigation of fluctuations and pattern-formation in miscible fluids.
TL;DR: A flowing-junction cell with cylindrical symmetry suitable to investigate fluctuations and pattern formation at the diffusing interface between two miscible phases of a liquid mixture that can be used in both gravity-stable and unstable conditions is described.
References
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Book
CRC Handbook of Chemistry and Physics
TL;DR: CRC handbook of chemistry and physics, CRC Handbook of Chemistry and Physics, CRC handbook as discussed by the authors, CRC Handbook for Chemistry and Physiology, CRC Handbook for Physics,
Book
Dynamic Light Scattering: With Applications to Chemistry, Biology, and Physics
Bruce J. Berne,R. Pecora +1 more
TL;DR: In this paper, a comprehensive introduction to principles underlying laser light scattering focuses on time dependence of fluctuations in fluid systems and provides an introduction to theory of time correlation functions, with chapters on projection operator techniques in statistical mechanics.
Journal ArticleDOI
Spiral defect chaos in large aspect ratio Rayleigh-Bénard convection.
TL;DR: The correlation length of the pattern decreased rapidly with increasing control parameter so that the size of a correlated area became much smaller than the area of the cell, suggesting that the chaotic behavior is intrinsic to large aspect ratio geometries.
Journal ArticleDOI
Ultralow-angle dynamic light scattering with a charge coupled device camera based multispeckle, multitau correlator
Luca Cipelletti,David A. Weitz +1 more
TL;DR: In this article, a multi-tau software correlator was used to measure dynamic light scattering at many angles simultaneously, from 0.07° to 5.1°, in order to cover the wide spectrum of decay times associated with the large range of accessible angles, where the correlator channel spacing is quasilogarithmic rather than linear.