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Granular flow thermal heat conductivity

Moreover, very few parameterizations are reported on the wall- and fluid-granular material convective thermal heat transfer coefficients. For introductory studies, the work of Natarajan and Hunt [55], Gunn [25], Kuibe and Broughton [40], Kuipers et al [41] and Patil et al [59] might be consulted. To enable validation and reliable predictions of non-isothermal non-adiabatic reactive granular flows the thermal conductivity and the convective heat transfer coefficients have to be determined with sufficient accuracy. For certain processes this may be an important task for future research in the field of granular flows in fluidized beds. [Pg.536]

Modeling Heat Transfer Thermal particle dynamics (TPD) primarily introduced by Vargas and McCarthy [14] incorporated both the contact mechanics and contact conductance theories to model the flow dynamics and heat conduction through dry granular materials. The details of the model can be found in Sahni et al. [12]. Heat transport is simulated accounting for the initial material temperature, wall temperature, heat capacity, heat transfer coefficient, and flow properties using a linear model. The flux of heat transported across the mutual boundary between two particles i and j in contact is described as follows ... [Pg.377]

In separation processes and chemical reactors, flow through cylindrical ducts filled with granular materials is important. In such systems conduction, convection, and radiation all contribute to the heat flow, and thermal conduction in axial ke x and radial ke r directions may be quite different, leading to highly anisotropic thermal conductivity. For a bed of uniform spheres, the axial and radial elements are approximated by... [Pg.456]

Hunt ML (1997) Discrete element simulations for granular material flows effective thermal conductivity and self-diffusivity. Int J Heat Mass Transfer 40 3059-... [Pg.948]

An insoluble granular material wet with water is being dried in a pan 0.457 X 0.457 m and 25.4 mm deep. The material is 25.4 mm deep in the metal pan, which has a metal bottom with thickness z f = 0.610 mm having a thermal conductivity = 43.3 W/m K, The thermal conductivity of the solid can be assumed as kj = 0.865 W/m K. Heat transfer is by convection from an air stream flowing parallel to the top drying surface and the bottom metal surface at a velocity of 6.1 m/s and having a temperature of 65.6°C and humidity H = 0.010 kg H20/kg dry air. The top surface also receives direct radiation from steam-heated pipes whose surface temperature Tg = 93.3°C. The emissivity of the solid is e = 0.92. Estimate the rate of drying for the constant-rate period. [Pg.550]

M. L. Hunt. "Discrete element simulations for granular material flows Effective thermal conductivity and self-diffusivity," Int J. Heat Mass Transfer, 40(3) 3059-3068, 1997. [Pg.96]


See other pages where Granular flow thermal heat conductivity is mentioned: [Pg.275]    [Pg.505]    [Pg.521]    [Pg.368]    [Pg.539]    [Pg.587]    [Pg.588]    [Pg.575]    [Pg.1048]    [Pg.1419]    [Pg.98]    [Pg.536]    [Pg.1418]    [Pg.1229]    [Pg.98]    [Pg.580]    [Pg.17]    [Pg.139]   
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