Critical suspension conditions in stirred crystallizers

P. Ayazi Shamlou; P. Synowiec; A. Zolfagharian

doi:10.1016/0923-0467(94)87005-5

Critical suspension conditions in stirred crystallizers

P. Ayazi Shamlou
, P. Synowiec
, A. Zolfagharian

Department of Chemical Engineering and Process Design (RCH/RCH3)

University College London

Research output: Contribution to journal › Article › peer-review

12 Citations (Scopus)

Abstract

Experimental data are provided for the critical rotational speed, often referred to as the just-suspension speed N_js, necessary to maintain particles in suspension in a 15 1 draft-tube-magma (DTM) crystallizer with a profiled base. The results are compared with previously published data obtained for a flat-bottom tank. The combination of a draft-tube and profiled base improves significantly the suspension capability of the crystallizer. This is shown by a reduction in the value of N_js. The data obtained in the DTM crystallizer and previously published results from the flat-bottom tank are analysed using a simple model of suspension based on a balance between the gravitational force and the dynamic force acting on the particles at the critical point when they are lifted into suspension. Agreement between theory and experiment is satisfactory.

Original language	English
Pages (from-to)	45-51
Number of pages	7
Journal	Chemical Engineering Journal and the Biochemical Engineering Journal
Volume	55
Issue number	1-2
DOIs	https://doi.org/10.1016/0923-0467(94)87005-5
Publication status	Published - Aug 1994

ASJC Scopus subject areas

Biochemistry

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10.1016/0923-0467(94)87005-5

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title = "Critical suspension conditions in stirred crystallizers",

abstract = "Experimental data are provided for the critical rotational speed, often referred to as the just-suspension speed Njs, necessary to maintain particles in suspension in a 15 1 draft-tube-magma (DTM) crystallizer with a profiled base. The results are compared with previously published data obtained for a flat-bottom tank. The combination of a draft-tube and profiled base improves significantly the suspension capability of the crystallizer. This is shown by a reduction in the value of Njs. The data obtained in the DTM crystallizer and previously published results from the flat-bottom tank are analysed using a simple model of suspension based on a balance between the gravitational force and the dynamic force acting on the particles at the critical point when they are lifted into suspension. Agreement between theory and experiment is satisfactory.",

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T1 - Critical suspension conditions in stirred crystallizers

AU - Ayazi Shamlou, P.

AU - Synowiec, P.

AU - Zolfagharian, A.

PY - 1994/8

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N2 - Experimental data are provided for the critical rotational speed, often referred to as the just-suspension speed Njs, necessary to maintain particles in suspension in a 15 1 draft-tube-magma (DTM) crystallizer with a profiled base. The results are compared with previously published data obtained for a flat-bottom tank. The combination of a draft-tube and profiled base improves significantly the suspension capability of the crystallizer. This is shown by a reduction in the value of Njs. The data obtained in the DTM crystallizer and previously published results from the flat-bottom tank are analysed using a simple model of suspension based on a balance between the gravitational force and the dynamic force acting on the particles at the critical point when they are lifted into suspension. Agreement between theory and experiment is satisfactory.

AB - Experimental data are provided for the critical rotational speed, often referred to as the just-suspension speed Njs, necessary to maintain particles in suspension in a 15 1 draft-tube-magma (DTM) crystallizer with a profiled base. The results are compared with previously published data obtained for a flat-bottom tank. The combination of a draft-tube and profiled base improves significantly the suspension capability of the crystallizer. This is shown by a reduction in the value of Njs. The data obtained in the DTM crystallizer and previously published results from the flat-bottom tank are analysed using a simple model of suspension based on a balance between the gravitational force and the dynamic force acting on the particles at the critical point when they are lifted into suspension. Agreement between theory and experiment is satisfactory.

UR - https://www.scopus.com/pages/publications/0028156158

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DO - 10.1016/0923-0467(94)87005-5

M3 - Article

AN - SCOPUS:0028156158

SN - 0923-0467

VL - 55

SP - 45

EP - 51

JO - Chemical Engineering Journal and the Biochemical Engineering Journal

JF - Chemical Engineering Journal and the Biochemical Engineering Journal

IS - 1-2

ER -

Critical suspension conditions in stirred crystallizers

Abstract

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