scispace - formally typeset
Search or ask a question
Topic

Thermal diffusivity

About: Thermal diffusivity is a research topic. Over the lifetime, 26992 publications have been published within this topic receiving 528625 citations.


Papers
More filters
Journal ArticleDOI
TL;DR: In this paper, thin-layer drying characteristics of garlic slices (2-4 mm) were investigated for a temperature range 50-90 °C, a relative humidity range 8-24%, and an airflow range 0.5-1 m/s.

808 citations

Journal ArticleDOI
TL;DR: A phase-field model (PFM) for solidification in binary alloys, which is found from the phase- field model for apure material by direct comparison of the variables for a pure material solidification and alloy solidification, is presented.
Abstract: We present a phase-field model (PFM) for solidification in binary alloys, which is found from the phase-field model for a pure material by direct comparison of the variables for a pure material solidification and alloy solidification. The model appears to be equivalent with the Wheeler-Boettinger-McFadden (WBM) model [A.A. Wheeler, W. J. Boettinger, and G. B. McFadden, Phys. Rev. A 45, 7424 (1992)], but has a different definition of the free energy density for interfacial region. An extra potential originated from the free energy density definition in the WBM model disappears in this model. At a dilute solution limit, the model is reduced to the Tiaden et al. model [Physica D 115, 73 (1998)] for a binary alloy. A relationship between the phase-field mobility and the interface kinetics coefficient is derived at a thin-interface limit condition under an assumption of negligible diffusivity in the solid phase. For a dilute alloy, a steady-state solution of the concentration profile across the diffuse interface is obtained as a function of the interface velocity and the resultant partition coefficient is compared with the previous solute trapping model. For one dimensional steady-state solidification, where the classical sharp-interface model is exactly soluble, we perform numerical simulations of the phase-field model: At low interface velocity, the simulated results from the thin-interface PFM are in excellent agreement with the exact solutions. As the partition coefficient becomes close to unit at high interface velocities, whereas, the sharp-interface PFM yields the correct answer.

804 citations

Journal ArticleDOI
TL;DR: In this paper, it was shown that the minimum temperature gradient for which convection can occur is approximately 4π2h2μ/kgρ0α D2, where h2 is the thermal diffusivity, g is the acceleration of gravity, μ is the viscosity, k is the permeability, α is the coefficient of cubical expansion, ρ 0 is the density at zero temperature, and D is the thickness of the layer; this exceeds the limiting gradient found by Rayleigh for a simple fluid by a factor of 16D2/27π2
Abstract: The problem is considered of the convection of a fluid through a permeable medium as the result of a vertical temperature‐gradient, the medium being in the shape of a flat layer bounded above and below by perfectly conducting media. It appears that the minimum temperature‐gradient for which convection can occur is approximately 4π2h2μ/kgρ0α D2, where h2 is the thermal diffusivity, g is the acceleration of gravity, μ is the viscosity, k is the permeability, α is the coefficient of cubical expansion, ρ0 is the density at zero temperature, and D is the thickness of the layer; this exceeds the limiting gradient found by Rayleigh for a simple fluid by a factor of 16D2/27π2kρ0. A numerical computation of this gradient, based upon the data now available, indicates that convection currents should not occur in such a geological formation as the Woodbine sand of East Texas (west of the Mexia Fault zone); in view of the fact, however, that the distribution of NaCl in this formation seems to require the existence of ...

796 citations

Book
01 Feb 1993
TL;DR: Topological method for structure-property correlations volumetric properties thermodynamic properties cohesive energy and solubility parameter transition and relaxation temperatures surface tension and interfacial tension optical properties electrical properties magnetic properties mechanical properties properties of polymers in dilute solutions sheer viscosity thermal conductivity and thermal diffusivity transport of small penetrant molecules.
Abstract: Topological method for structure-property correlations volumetric properties thermodynamic properties cohesive energy and solubility parameter transition and relaxation temperatures surface tension and interfacial tension optical properties electrical properties magnetic properties mechanical properties properties of polymers in dilute solutions sheer viscosity thermal conductivity and thermal diffusivity transport of small penetrant molecules.

757 citations

Journal ArticleDOI
02 Nov 2007-Polymer
TL;DR: In this article, the effects of 13 material and operating parameters on electrospun fiber diameters are determined by varying the parameter values in an electrospinning theoretical model, and the results show that the five parameters (volumetric charge density, distance from nozzle to collector, initial jet/orifice radius, relaxation time, and viscosity) have the most significant effect on the jet radius.

747 citations


Network Information
Related Topics (5)
Heat transfer
181.7K papers, 2.9M citations
87% related
Oxide
213.4K papers, 3.6M citations
83% related
Adsorption
226.4K papers, 5.9M citations
83% related
Turbulence
112.1K papers, 2.7M citations
83% related
Dielectric
169.7K papers, 2.7M citations
82% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023772
20221,603
2021828
2020788
2019862
2018797