Experimental investigation of liquid flow shift due to gas cross flow in non-wetted packed beds

Liu, D. Y., Wang, G. X. and Litster, J. D. (2001) Experimental investigation of liquid flow shift due to gas cross flow in non-wetted packed beds. Isij International, 41 1: 10-17. doi:10.2355/isijinternational.41.10

Author Liu, D. Y.
Wang, G. X.
Litster, J. D.
Title Experimental investigation of liquid flow shift due to gas cross flow in non-wetted packed beds
Journal name Isij International   Check publisher's open access policy
ISSN 0915-1559
Publication date 2001
Sub-type Article (original research)
DOI 10.2355/isijinternational.41.10
Volume 41
Issue 1
Start page 10
End page 17
Total pages 8
Editor M. Kato
Place of publication Tokyo
Publisher Iron & Steel Institute of Japan
Collection year 2001
Language eng
Subject C1
290699 Chemical Engineering not elsewhere classified
670499 Other
670601 Chemical fertilisers
Abstract An experimental study has been carried out for the gas-liquid two-phase flow in a packed bed simulating conditions of the gas and liquid flows in the lower part of blast furnace. The localised liquid flow phenomenon in presence of gas cross flow, which usually occurs around the cohesive zone and raceway in blast furnace, was investigated in detail. Such liquid flow is characterised in terms of liquid shift distance or liquid shift angle that can effectively be measured by the experiments involved in the current study. It is found that liquid shift angle does not significantly increase or decrease with different packing depth. This finding supports the hypothesis of the force balance model where a vectorial relationship among acting forces, i.e. gas drag force, gravitational force and solid-liquid friction force, and liquid shift angle does exist. Liquid shift angle is inversely proportional to particle size and liquid density, and proportional to square of gas superficial velocity, but is almost independent on liquid flowrate and liquid viscosity. The gas-liquid drag coefficient, an important aspect for quantifying the interaction between gas and liquid flows, was conceptually modified based on the discrete feature of liquid flow through a packed bed and evaluated by the combined theoretical and experimental investigation. Experimental measurements suggest that the gas-liquid drag coefficient is approximately a constant (C-DG(')=5.4+/-1.0) and is independent on liquid properties, gas velocity and packing structure. The result shows a good agreement with previous experimental data and prediction of the existing liquid flow model.
Keyword Metallurgy & Metallurgical Engineering
Gas-liquid Two-phase Flow
Discrete Liquid Flow
Gas-liquid Drag Coefficient
Packed Bed
Blast Furnace
Furnace Lower Zone
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Chemical Engineering Publications
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Created: Tue, 14 Aug 2007, 16:55:27 EST