نتایج جستجو برای: generalized thermodiffusion

تعداد نتایج: 165907  

Journal: :Physical review letters 2003
X Garbet L Garzotti P Mantica H Nordman M Valovic H Weisen C Angioni

Particle transport in magnetized plasmas is investigated with a fluid model of drift wave turbulence. An analytical calculation shows that magnetic field curvature and thermodiffusion drive an anomalous pinch. The curvature driven pinch velocity is consistent with the prediction of turbulence equipartition theory. The thermodiffusion flux is found to be directed inward for a small ratio of elec...

Journal: :Langmuir : the ACS journal of surfaces and colloids 2007
Shawn A Putnam David G Cahill Gerard C L Wong

Measurements of particle flows driven by temperature gradients are conducted as a function of temperature on aqueous suspensions of polystyrene nanoparticles and proteins of T4 lysozyme and mutant variants of T4 lysozyme. The thermodiffusion coefficients are measured using a microfluidic beam deflection technique on suspensions with particle concentrations on the order of 1 vol %. At T < or ~ 2...

2012
Morteza Eslamian

Recent advances in thermodiffusion (Soret effect) in binary and higher multicomponent liquid mixtures are reviewed. The mixtures studied include the hydrocarbon, associating, molten metal and semiconductor, polymer, and DNA mixtures. The emphasis is placed on the theoretical works, particularly models based on the nonequilibrium thermodynamics, although other approaches such as the statistical,...

2006
A. J. Janavičius

Previously, we considered the analytical solution of nonlinear diffusion equation in two-dimensional surface. This allows us to consider the same nonlinear heat conduction equation for metals heated by a picosecond laser. After fast thermalization (within a few femtoseconds) of the laser energy and electron excitation in the conductivity band, electrons ballistically diffuse and transfer their ...

2008
Claire CHEVALIER Fabrice DEBBASCH Jean-Pierre RIVET

In presence of thermal inhomogeneities, particle diffusion is known to occur even without concentration gradients. This phenomenon, known as “thermodiffusion” or “Ludwig-Soret effect” is well documented since the nineteenth century, and has numerous current applications which range from astrophysics to polymer physics and chemistry. In this contribution, we propose new microscopic stochastic mo...

2008
C. CHEVALIER

New stochastic models of thermodiffusion are constructed and their hydrodynamical limits are studied through a first order Chapman-Enskog expansion. These models differ from earlier ones by taking into account all first order contributions proportional to the temperature gradient and, thus, allow for both positive and negative Soret coefficients, in accordance with observations.

Journal: :Annalen der Physik und Chemie 1873

Journal: :The Journal of chemical physics 2008
G Galliero S Volz

In this work, a new algorithm is proposed to compute single particle (infinite dilution) thermodiffusion using nonequilibrium molecular dynamics simulations through the estimation of the thermophoretic force that applies on a solute particle. This scheme is shown to provide consistent results for model nanofluids in the liquid state (spherical nonmetallic nanoparticles+Lennard-Jones fluid) wher...

2014
K. Chowdhury

The effect of mass transfer on MHD mixed convective flow along inclined porous plate with thermodiffusion have been analyzed on the basis of boundary layer approximations. The fluid is assumed to be incompressible and dense, and a uniform magnetic field is applied normal to the direction of the flow. A Similarity transformation is used to transform the problem under consideration into coupled n...

2001
T. BURCHULADZE

The method of investigation of non-stationary boundary value problems of the theory of thermodiffusion using the Laplace integral transform is described. In the classical theory of elasticity this method was first used by V. Kupradze and the author. The interconnection of deformation, thermal conductivity and diffusion processes in an elastic isotropic solid body is described by a system of fiv...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید