D R Chaudhary
Articles written in Pramana – Journal of Physics
Volume 3 Issue 6 December 1974 pp 383-389 Experimental Techniques
The theory of the continuous flow electrical method for the determination of specific heat of liquids has been extended to the measurements of effective specific heat of packed bed materials consisting of solid-liquid phase systems. Experimental data are reported showing the variation of effective specific heat with mass porosity and saturating liquid specific heat. The weighted arithmetic mean equation of constituent specific heats is in fair agreement with the measured values.
Volume 20 Issue 4 April 1983 pp 339-346 Statistical Mechanics
The weighted geometric mean of resistors considered for determining the effective thermal conductivity
Volume 22 Issue 1 January 1984 pp 63-70 Solid State Physics
Assuming a regular geometry of dispersed phase (
Volume 23 Issue 5 November 1984 pp 599-605 Solid State Physics
The integrated theory derived for the lattice-type dispersions is modified and extended to estimate the effective thermal conductivity of loose and granular two-phase materials at normal pressure assuming an effective continuous media approximation. A comparison of calculated values of
Volume 24 Issue 5 May 1985 pp 781-786 Solid State Physics
Considering the htermal conduction through molecular collisions an expression for the effective thermal conductivity
Volume 25 Issue 3 September 1985 pp 311-317 Solid State Physics
A loose three-phase system made of metal, non-metal and air is considered resulting from small successive dispersions in effective continuous medium (
Volume 29 Issue 2 August 1987 pp 217-223 Condensed Matter Physics
A structural analysis of effective medium formed by dispersed systems from the viewpoint of flux modification at large dispersions is presented. The effective medium coefficient is investigated for its parametric dependence and the effective properties are estimated through this dependence. This estimation covers all highly dispersed two-phase systems including the effect of container.
Volume 31 Issue 6 December 1988 pp 523-528 Condensed Matter Physics
A numerical model has been described to estimate the effective thermal conductivity of moist soils, considering the effective continuous medium approximation and taking all possible interactions. Numerical solutions of the exact formulations are presented. Experimental measurements have been carried out for the thermal conductivity of dune sand at different moisture contents employing the method of unsteady state line source. The predicted and measured values show reasonable agreement.
Volume 33 Issue 5 November 1989 pp 587-594 Soil Physics
An experimental study has been done to investigate the heat conduction and moisture distribution through the different layers of unsaturated soil. The soil is taken in the form of cylindrical columns in vertical and horizontal positions. The two ends of the cylindrical column were maintained at different constant temperature. The effective thermal conductivity was measured by dynamical method after achieving steady state. The distribution of moisture in the soil column was determined by gravimetric technique. The effective thermal conductivity (ETC) has also been predicted by temperature dependent model developed by Singh
Volume 34 Issue 4 April 1990 pp 359-367
An attempt has been made to minimize the sources of error involved in the transient probe method for thermal conductivity determination. Two sensors (thermocouples) are mounted parallel to the needle probe at known distances. This modification makes it a device for simultaneous conductivity and diffusivity determination. Thermal conductivity and diffusivity for glycerine, dune sand and mustard seed are determined by this method. Results obtained are compared with those obtained by a calibrated transient probe for conductivity and by a parallel wire method for diffusivity. Analysis of the results prove it to be a better instrument over the traditional ones. The technique can also be used as a direct reading device for conductivity and diffusivity measurements.
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