Temperature Effects on the Gas Hold-up in Agitated Vessels

Schaper, R. and Haan de, A.B. and Smith, J.M. (2002) Temperature Effects on the Gas Hold-up in Agitated Vessels. Transactions of the Institution of Chemical Engineers. Part A: Chemical engineering research and design, 80 (8). pp. 887-892. ISSN 0263-8762

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Abstract:	Previous work found the gas hold-up in a tall, 0.15 m3 vessel, agitated by three impellers, to decrease considerably with temperature. This was attributed to a decrease in liquid viscosity, a decrease in surface tension or a decrease in gas density. The aim of this work was to investigate the influence of gas density on the gas hold-up. First of all, it was attempted to reproduce the data found in literature. It was shown that contaminants had a significant impact on the gas hold-up. Experiments with increasing and decreasing amounts of tap water (as the source of the contamination) found the gas hold-up to be affected by a strongly absorbing non-ionic surface active agent. Experiments in a system exhibiting low conductivity and low gas hold-up showed that the gas hold-up decreased by 15% for temperatures between 295 and 350K. Experiments with helium as sparging gas found that gas density does have a lowering effect on the gas hold-up. The gas hold-up did not change for temperatures above 350K, which may be due to the increased presence of micro-bubbles in a near-boiling system.
Item Type:	Article
Copyright:	© 2002 The Institution of Chemical Engineers
Research Group:	Membrane Science and Technology (MST)
Link to this item:	http://purl.utwente.nl/publications/58518
Official URL:	http://dx.doi.org/10.1205/026387602321143435
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