The specific interfacial area in external-circulation-loop airlifts and a bubble column-II. Carboxymethyl cellulose/sulphite solution
✍ Scribed by Milan Popović; Campbell W. Robinson
- Publisher
- Elsevier Science
- Year
- 1987
- Tongue
- English
- Weight
- 1009 KB
- Volume
- 42
- Category
- Article
- ISSN
- 0009-2509
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✦ Synopsis
Specific gas-liquid interfacial areas and gas hold-ups in the riser and downcomer sections as well as the liquid circulating velocity were studied using highly viscous pseudo-plastic solutions of carboxymethyl cellulose (CMC). The specific interfacial area was measured by the chemical reaction method (sulphite oxidation). The measurements were carried out in two sizes of external-circulation-loop airlift (ECL-AL) having downcomer-to-riser cross-sectional area ratios (Ad/Ad of 0.111 and 0.444. Parallel studies in a bubble-column-type fermentor (Ad/A, = 0) were performed for comparison. All the parameters studied are greatly affected by Ad/A, and the gas superficial velocity, uGR, while the influence of the effective viscosity, aim, varies from parameter to parameter. A correlation for the specific interfacial area considering the effect of uGR, Ad/A, and qeff is proposed.