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K Tankeshwar

Publications and source records attributed to K Tankeshwar.

8 recordsLinked to original sources
PubMed2004

Reply to "Comment on 'Collective dynamics in liquid lithium, sodium, and aluminum' ".

Phys. Rev. E 70, 013201 (2004)]] have raised certain objections to physical interpretation of the parameters of the model proposed by us earlier [Phys. Rev. E 67, 012201 (2003)]]. We have found that heat diffusion term enters into processes which are responsible for the quasielastic peak of the dynamical structure factor. An attempt has been made to study the role played by atomic and electronic contributions to thermal conductivity for studying atomic density-density correlation function.

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PubMed2003

Binary and multiparticle contributions to the velocity autocorrelation function.

A method for including the contribution of many-body correlation effects to the microscopically obtained results of the two-body contribution to the velocity autocorrelation has been proposed. A significant improvement over the results obtained through only binary contribution has been found, as can be judged by comparing the results for force and velocity autocorrelation functions of Lennard Jones fluids with that of molecular dynamic simulations. The agreement of results of self-diffusion coefficient is also quite good with simulation data over a wide range of densities and temperatures.

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PubMed2003

Shear viscosity of liquid mixtures: mass dependence.

The expressions for zeroth, second, and fourth sum rules of the transverse stress autocorrelation function of a two-component fluid have been derived. These sum rules and Mori's memory function formalism have been used to study the shear viscosity of Ar-Kr and isotopic mixtures. It has been found that the theoretical result is in good agreement with the computer simulation result for the Ar-Kr mixture. The mass dependence of shear viscosity for different mole fractions shows that deviation from ideal linear model comes even from the mass difference in two species of the fluid mixture. At higher mass ratio, shear viscosity of the mixture is not explained by any of the empirical models.

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PubMed2003

Collective dynamics in liquid lithium, sodium, and aluminum.

Inelastic x-ray scattering data of liquid Li, Na, and Al for dynamical structure factors have been analyzed by proposing a semiempirical model. The model is based on the extension of the hydrodynamic model to the viscoelastic region so that it satisfies the first four nonvanishing sum rules. It has been found that the semiempirical model fits well with the x-ray scattering data for liquid metals investigated here. The physical meaning of the parameters is also discussed.

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