منابع مشابه
Modelling radiative heat transfer in packed beds
A comprehensive approach for modelling dependent radiative heat transfer in beds of large (geometric range) spherical particles is presented. Such a system of large spheres lies in the dependent range even for large porosities. We show that the dependent properties for a bed of opaque spheres can be obtained from their independent properties by scaling the optical thickness while leaving the al...
متن کاملRadial heat transport in packed beds at elevated pressures
Values were measured for the effective radial, heat conductivity d,, T and the heat transfer coetbcient at the wall CC, in a packed bed. This was done for superficial velocities of 5-70 cm SC’ and at pressures from l-10 bar. Values for i efr, r and rw were obtained by simultaneous fitting of measured axial and radial temperature profiles. The bed diameter was S cm; it was filled with 6.1 mm Ras...
متن کاملFlow through Packed Beds and Fluidized Beds
Chemical engineering operations commonly involve the use of packed and fluidized beds. These are devices in which a large surface area for contact between a liquid and a gas (absorption, distillation) or a solid and a gas or liquid (adsorption, catalysis) is obtained for achieving rapid mass and heat transfer, and particularly in the case of fluidized beds, catalytic chemical reactions. You wil...
متن کاملEffect of solid conductivity on radiative heat transfer in packed beds
THE SOLUTION of the radiative heat transfer problem in porous media has received considerable attention for a number of years (e.g.. Vortmeyer [I], Tien and Drolen [2], ’ nd Kaviany and Singh [3]). The medium may be considere d as a continuum or as a discrete collection of particles, depending on whether the packing lies in the dependent or independent scattering/absorption range. Independent s...
متن کاملHeat Transfer in Packed Beds: Experimental Evaluation of One-phase Water Flow
Experimental heat transfer studies were carried out in 50.8 mm diameter packed beds of glass beads percolated by water and heated from the wall. The tube-to-particle diameter ratio (D/dp) ranged from 1.72 to 13.7 and the water flow rate from 1.1 to 9.9 l/min. Bed heights ranged from 100 mm to 700 mm. The radial temperature was measured above the bed surface by five aligned sheathed thermocouple...
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ژورنال
عنوان ژورنال: Chemical engineering
سال: 1971
ISSN: 0375-9253
DOI: 10.1252/kakoronbunshu1953.35.1354