Micron-scale apparatus for measurements of thermodiffusion in liquids

Putnam, Shawn A.; Cahill, David G.

doi:10.1063/1.1765761

Cited by 32 publications

(48 citation statements)

References 11 publications

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“…To interpret her experiments on nanoparticles migration in a solvent using the beam deflection technique [35], Putnam [36] reviewed current theories and available data for thermophoresis in liquids. She noted that thermophoretic diffusion can be ''negative" (b < 0) for aqueous suspensions of charged particles at low ionic strengths [37] and ferro-fluids [38], exhibit temperature dependence [39][40][41], and vary with volume fraction [40] and ionic concentrations [39].…”

Section: Thermophoresis In Liquidsmentioning

confidence: 99%

Heat transfer enhancement in suspensions of agitated solids. Part III: Thermophoretic transport of nanoparticles in the diffusion limit

Louge

Chen

2008

International Journal of Heat and Mass Transfer

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Section: Thermophoresis In Liquidsmentioning

confidence: 99%

Heat transfer enhancement in suspensions of agitated solids. Part III: Thermophoretic transport of nanoparticles in the diffusion limit

Louge

Chen

2008

International Journal of Heat and Mass Transfer

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“…Other excellent reviews were written by Srinivasan and Saghir [11], Platten [12], and Wiegand [13]. The methods that are of most interest in the context of the present paper are fast methods that work at very small length scale, such as optical beam deflection [14], thermal diffusion forced Rayleigh scattering [15,16], and optical digital interferometry [17].…”

Section: Introductionmentioning

confidence: 99%

Non-equilibrium molecular dynamics simulations of the transient Ludwig-Soret effect in a binary Lennard-Jones/spline mixture

Hafskjold

2017

Eur. Phys. J. E

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SummaryA binary isotope mixture of Lennard-Jones/spline particles at equilibrium was perturbed by a sudden change in the system's boundary temperatures. The system's response was determined by nonequilibrium molecular dynamics (NEMD). Three transient processes were studied: (1) The propagation of a pressure (shock) wave, (2) heat diffusivity and conduction, and (3) thermal diffusion (the LudwigSoret effect). These three processes occur at different time scales, which makes it possible to separate them in one single NEMD run. The system was studied in liquid, supercritical, and dense gas states with various forms and strengths of the thermal perturbation. The results show that heat was initially transported by two separate mechanisms; (1) heat diffusion as described by the transient heat equation and (2) as a consequence of a pressure wave. The pressure wave travelled faster than the speed of sound, generating a shock wave in the system. Local equilibrium was found in the transient phase, even with very strong perturbations and in the shock front. Although the mass separation due to the Ludwig-Soret effect developed much slower than the pressure and temperature fields in the system at large, it was found that the Soret coefficient could be accurately determined from the initial phase of the transient and close to the heat source. This opens the possibility of a new way to analyse results from transient experiments and thereby minimize effects of gravity and convection due to buoyancy.

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“…The rising interest in the reliable measurement causes appearance of new approaches, 11,12 revisiting early established techniques 13 and tendency of cross checking the results obtained by different methods. 14,15 For this reason, the Benchmark of Fontainebleau was performed, 14 where several laboratories carried out a quantitative comparison between different experimental methods actively used in [1999][2000][2001][2002][2003] to determine the diffusion, thermal diffusion, and Soret coefficients of three binary liquid mixtures.…”

Section: Introductionmentioning

confidence: 99%

Measurement of the Soret and diffusion coefficients for benchmark binary mixtures by means of digital interferometry

Mialdun

Shevtsova

2011

The Journal of Chemical Physics

102

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We report on the development of the optical digital interferometry (ODI) technique for measuring diffusion and Soret coefficients. The unique feature of this method is that it traces the transient path of the system in the entire two-dimensional cross section of a cell. In this way, it is applicable not only for measurements of Soret coefficients, but also for studying diffusive transport mechanism and convection. Presently, this method is not widely used and, in our view, not because of fundamental limitations but rather due to a lack of properly developed postexperimental procedures of the raw data analysis. Thus, in this paper our attention is focused on the successive analysis of different steps: the fringe analysis, the choice of reference images, the thermal design of the cell, and multiparameter fitting procedure. Using the ODI technique, we have measured the diffusion and the Soret coefficients for three binary mixtures composed of dodecane (C 12 H 26 ), isobutylbenzene, and 1,2,3,4-tetrahydronaphtalene at a mean temperature of 25 • C and 50 wt. % in each component. These measurements were compared with their benchmark values and show an agreement within less than 3%.

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Micron-scale apparatus for measurements of thermodiffusion in liquids

Cited by 32 publications

References 11 publications

Heat transfer enhancement in suspensions of agitated solids. Part III: Thermophoretic transport of nanoparticles in the diffusion limit

Heat transfer enhancement in suspensions of agitated solids. Part III: Thermophoretic transport of nanoparticles in the diffusion limit

Non-equilibrium molecular dynamics simulations of the transient Ludwig-Soret effect in a binary Lennard-Jones/spline mixture

Measurement of the Soret and diffusion coefficients for benchmark binary mixtures by means of digital interferometry

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