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Showing 1 to 20 of 37 for “"packed beds"”.
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Heat transfer to packed beds
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1959.
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Gas distribution in shallow packed beds
Packed beds have many industrial applications and are increasingly used in the process industries due to their low pressure drop. With the introduction of more efficient packings, novel packing materials (i.e. adsorbents) and new applications (i.e. flue gas desulphurisation); the aspect ratio …
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Coalescence of secondary dispersions in packed beds
… of the coalescence of secondary dispersions in beds of monosized glass ballotini. The variables investigated were superficial velocity, bed depth, ballotini size and dispersed phase concentration. Equipment was designed to generate a toluene ln water dispersion with phase ratios from 0.1 - 1.0 …
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Heat transfer in packed beds of crushed rock
The use of packed beds of crushed rocks with air as the heat transfer medium has been proposed as a cost-effective, widely available method to store thermal energy at high temperatures. To design such a system, it is important to understand the properties of the crushed rocks, as well as the …
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Gas distribution in shallow large diameter packed beds
… distribution of gas and liquid in large diameter packed columns to maintain mass transfer efficiency on scaling up. This work presents measurements and methods of evaluating maldistributed gas flow in packed columns. Little or no previous work has been done in this field. A gas maldistribution …
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Transfer Rates and Wall Coefficients in Packed Beds
Made available in DSpace on 2014-12-05T17:15:09Z (GMT). No. of bitstreams: 1 0007864.pdf: 3472538 bytes, checksum: 038b31e52a019e40a2fa205d593410d5 (MD5) Previous issue date: 1954
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Heat and mass transfer from endogeus combustion processes in packed beds.
… smouldering combustion processes deep inside packed beds, especially domestic refuse beds, it is a major task in early fire detection to detect the indications of such combustions as early as possible. Since it is believed that the surface temperature distribution of the bed is affected by the …
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The performance of fluidized beds, packed beds, and screens as fuel cell electrodes
… been developed to predict the performance of packed bed electrodes and screen electrodes (two other flooded electrode designs).
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Modeling the flow of non-Newtonian fluids in packed beds at the pore scale
… materials, subsurface water contamination, packed-bed reactors, and enhanced oil recovery. The general approach to modeling such processes is at the continuum scale. Semi-empirical expressions, such as Darcy's law, are substituted for velocity in the continuity equation, which is then …
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Lattice Boltzmann Study of the Interstitial Hydrodynamics and Dispersion in Steady Inertial Flows in Large Randomly Packed Beds
… fluid dynamics and dispersion in two-dimensional packed beds in the inertial regime (post-Stokes flow) is undertaken starting from first principles. Long exponential tails are found in the histograms of both interstitial velocity components for low porosity packed beds, showing agreement with …
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Investigation of pressure drop and velocity profiles in packed beds and their relation to flow behavior in the dry zone of the iron blast furnace
Includes bibliographical references.
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Analysis and optimisation of thermal energy storage
… this project is the storage of thermal energy in packed beds for bulk electricity storage applications. Packed beds are composed of pebbles through which a heat transfer fluid passes, and a thermodynamic model of the heat transfer processes within the store is described. The packed beds are …
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3D modelling by computational fluid dynamics of local interactions of momentum, mass and heat transfers with catalyst deactivation in gas-solid catalytic reactors of low aspect ratios
Packed beds of gas-solid systems are extensively used as reactors, separators, dryers, filters, heat exchangers and combustors. The design of packed beds requires a detailed knowledge of local dynamics of flow, composition and temperature. Unfortunately, investigations for the development of 3D …
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Towards an understanding of mass transfer and hydrodynamics in packed bed reactors using Nuclear Magnetic Resonance
… phenomena that govern the performance of packed bed reactors. The aim of this work is to gain insight into factors that affect the process of fines deposition and mass transfer inside packed beds to ultimately enable optimisation of these processes. Although mass transfer correlations …
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Acoustic Propagation in Poroelastic Media
… ground water supplies, and the flow of fluids in packed beds. The aim of this work is to solve the equations of motion for the fluid and solid domains of a porous media, for the propagation of acoustic or small amplitude waves through the media. Porous media are modeled as periodic cubic arrays of …
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Coalescence Behaviour of Liquid Drops at Solid Surfaces
… hydrodynamics and coalescence mechanisms in packed beds has been reviewed. The fundamentals of liquid-liquid and solid-liquid coalescence, and characterisation of 'wetting' or 'non-wetting' behaviour in liquid-vapour-solid systems by contact angles are summarised. Contact angle measurements …
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Packed bed reactors at the pellet scale: magnetic resonance studies of hydrodynamics, mass transport and reaction
Packed bed reactors are widely used in the chemical and petrochemical industries to facilitate heterogeneous catalytic reactions. Despite the widespread use of packed bed reactors in industry, the flow, transport, and reaction phenomena occurring at the scale of individual catalyst pellets is …
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Liquid entrainment from spray distributors for packed columns
… spray nozzles used in liquid distributors of packed beds. The model is based on a mathematical representation of the drop size distribution in sprays, and on the drop buoyancy equations. It takes into account flow rates and physical properties of the gas and liquid as well as the orifice …
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Investigation of Multiphase Reactor Hydrodynamics Using Magnetic Resonance Imaging
… images of the gas and liquid phases in the packed beds, and of the gas and the solid phases in the fluidised bed. This study reports the first spatially resolved velocity measurements of both the gas and liquid phases in a co-current upflow bed, and the gas and solid phases of an isolated …
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