Experimental study on mixing time and hydrodynamics in mixing element of an air-lift mixer settler

IF 3.3 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Progress in Nuclear Energy Pub Date : 2025-03-19 DOI:10.1016/j.pnucene.2025.105721

Ankit Ojha , Nirvik Sen , K.K. Singh , K. Umadevi , G. Sreekumar

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Abstract

Gas-liquid hydrodynamics and mixing characteristics in batch vessel equipped with mixing element of air-lift solvent extraction contactor (CALMSU) is reported. Photographic technique involving a coloured tracer is used. Mixing dynamics of tracer is tracked using high speed camera in a 5 L glass beaker with mixing element. The resultant video is analysed using three different algorithms for mixing time determination. Measurements are taken at three different axial locations (top, bottom, middle) to ensure throughout mixing. A systematic study on the effects of air flow rate, mixing element submergence, and tracer addition point on mixing time is reported. The mixing time decreases with an increase in air flow rate, reaches a minimum, and then increases. Mixing time is seen to monotonically decrease with increase in submergence of the mixer. Mixing is also dependent on the location of tracer release. Successive experiments were performed to determine effect of air flow rate and submergence on bubble size distribution and estimation of Saunter mean bubble diameter. Bubble size is seen to be rather independent of air flow rate while it decreases with increase in liquid level. Ejection length is also found to be increasing with increase in air flow rate up to a level before plateauing out.

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来源期刊

Progress in Nuclear Energy 工程技术-核科学技术

CiteScore

5.30

自引率

14.80%

发文量

331

审稿时长

3.5 months

期刊介绍： Progress in Nuclear Energy is an international review journal covering all aspects of nuclear science and engineering. In keeping with the maturity of nuclear power, articles on safety, siting and environmental problems are encouraged, as are those associated with economics and fuel management. However, basic physics and engineering will remain an important aspect of the editorial policy. Articles published are either of a review nature or present new material in more depth. They are aimed at researchers and technically-oriented managers working in the nuclear energy field. Please note the following: 1) PNE seeks high quality research papers which are medium to long in length. Short research papers should be submitted to the journal Annals in Nuclear Energy. 2) PNE reserves the right to reject papers which are based solely on routine application of computer codes used to produce reactor designs or explain existing reactor phenomena. Such papers, although worthy, are best left as laboratory reports whereas Progress in Nuclear Energy seeks papers of originality, which are archival in nature, in the fields of mathematical and experimental nuclear technology, including fission, fusion (blanket physics, radiation damage), safety, materials aspects, economics, etc. 3) Review papers, which may occasionally be invited, are particularly sought by the journal in these fields.