Axial and Radical Dispersion for Two-phase Flow in Packed Columns PDF Download
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Author: Mohammed Mehdi Farid
Publisher:
ISBN:
Category : Packed towers
Languages : en
Pages :
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Book Description
Author: Mohammed Mehdi Farid
Publisher:
ISBN:
Category : Packed towers
Languages : en
Pages :
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Author: Olaf Martin Stokke
Publisher:
ISBN:
Category :
Languages : en
Pages : 84
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Book Description
Author: David Arthur Hayford
Publisher:
ISBN:
Category : Fluid dynamics
Languages : en
Pages : 814
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Book Description
Author: Gabriel L. Jacques
Publisher:
ISBN:
Category : Packed towers
Languages : en
Pages : 322
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Book Description
Author: Gabriel L. Jacques
Publisher:
ISBN:
Category : Diffusion in hydrology
Languages : en
Pages : 156
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Book Description
Author: Salah Ahmad Baker
Publisher:
ISBN:
Category : Packed towers
Languages : en
Pages : 0
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Dispersion phenomena in packed beds in both axial and radial directions were studied to provide basic data for extraction-tower design. Nine different beds were used, involving regular and random arrangements of spheres, and random arrangements of Raschig rings and Intalox saddles. For one-phase flow a wide range of Reynolds numbers was used (5 to 2000), covering regions of laminar, transition, and turbulent flow. For the axial Peclet number, different constant values were found in the turbulent range and in the laminar range. The existence of a fairly sharp transition region was observed. Radial-dispersion results showed similar behavior. The axial Peclet number was found to vary inversely with bed porosity, while the radial Peclet number was almost proportional to porosity. For two-phase fiow, measurements were made up to the flooding point, which occurred at Reynolds numbers near 100. The axial Peclet number for both continuous and discontinuous phases is a function of the Reynolds numbers for the two individual phases. For each phase, the laminar value of the axial Peclet number obtained for one-phase flow is an upper limit. Values as low one- fifth of this limiting value were found at relatively large flow rates of the second phase. The radial Peclet number was measured only for the continuous phase of two-phase systems; it was found to decrease in the same direction, but by a smaller percentage. (auth).
Author: Salah Ahmad Baker
Publisher:
ISBN:
Category : Packed towers
Languages : en
Pages :
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Author: Virendra Kumar Mathur
Publisher:
ISBN:
Category : Axial flow
Languages : en
Pages : 340
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Book Description
"A steady state approach was followed in this investigation to determine the effects of liquid and gas flow rates, packing size and packing height on the interphase mass transfer coefficient and gas phase axial mixing Peclet numbers. Experiments were performed on the absorption of carbon dioxide from a mixture of carbon dioxide and nitrogen in a packed column. Absorption was performed using 1/4, 3/8 and l/2 inch Raschig rings, with a packing height of 3 feet and also using 3/8 inch Raschig rings with a packing height of 5 feet. The liquid and gas flow ranges used were 2865 to 5680 lb./hr.sq.ft. and 5.0 to 7.4 lb./hr.sq.ft., respectively. Three mathematical models, viz. (i) plug flow in both the gas and liquid phases, (ii) axial mixing in gas phase and plug flow in liquid phase, and (iii) axial mixing in both gas and liquid phases, were used. It is found that axial mixing in the gas phase increases with increases in liquid flow rate, packing size and packing height. The behavior of apparent and true mass transfer coefficients indicates a decrease in axial mixing with increases in gas flow rates. However, axial mixing is found to be small under the experimental conditions used in this investigation. The gas phase Peclet numbers obtained in this investigation are about fifty times greater than reported by workers using a transient technique under the same conditions. Correlations for the apparent and true over-all liquid phase mass transfer coefficients are also presented"--Abstract, leaf ii.
Author: Nikolai Kolev
Publisher: Elsevier
ISBN: 0080463924
Category : Technology & Engineering
Languages : en
Pages : 709
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Book Description
Packed bed columns are largely employed for absorption, desorption, rectification and direct heat transfer processes in chemical and food industry, environmental protection and also processes in thermal power stations like water purification, flue gas heat utilization and SO2 removal. These Separation processes, are estimated to account for 40%-70% of capital and operating costs in process industry. Packed bed columns are widely employed in this area. Their usage also for direct heat transfer between gas and liquid, enlarge their importance. They are the best apparatuses, from thermodynamical point of view, for mass and heat transfer processes between gas and liquid phase. Their wide spreading is due to low capital investments and operating costs. Since 1995 there has not been published a specialised book in this area, and this is a period of quick development of packed columns. Packed Bed Columns reflects the state of this field including the author's experience on creating and investigating of new packings, column internals and industrial columns. - Considers the theories of mass transfer processes and shows how they help the construction of highly effective packings - Complete information about the performance characteristics of different modern types of highly effective packings - Considers the models for calculation and areas of their application
