Investigation of the dispersion and mixing states of gas-solid-liquid phases in a stirred vessel with a non-sedimenting slurry using Electrical Resistance Tomography

2017 Fiscal Year Final Research Report

• Project/Area Number: 26289285
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Properties in chemical engineering process/Transfer operation/Unit operation
• Research Institution: Yokohama National University
• Principal Investigator: KAMINOYAMA Meguru 横浜国立大学, 大学院工学研究院, 教授 (50233945)
• Co-Investigator(Renkei-kenkyūsha): NISHI Kazuhiko 千葉工業大学, 工学部, 教授 (20262412) ; MISUMI Ryuta 横浜国立大学, 大学院工学研究院, 特別研究教員 (40334635)
• Research Collaborator: NAKAHARA Hikari ; YAMAMOTO Taisei ; ARAI Kazuki ; SUGIYAMA Koji ; HAKAMADA Tokio
• Project Period (FY): 2014-04-01 – 2018-03-31
• Keywords: 化学工学 / プロセス / 撹拌・混合 / トモグラフィ / スラリー流体

Outline of Final Research Achievements

We investigated the mechanism enhancing the dispersion and mixing of a slurry, a plastic fluid, in a stirred vessel by aeration based on the data measured for the passage of the bubbles and the liquid flow state. The passage of the bubbles could be roughly classified into three types, depending on the impeller rotational speed. We clarified quantitatively the liquid flow state by estimating the rate of the liquid flow entraining the bubbles. We estimated the rates based on the experimental data from dynamically sampling the liquid, which included a tracer injected to the vessel, with the aid of a numerical mixing model. We determined the mixing index and were able to estimate the mixing time from the liquid flow entraining the bubbles and the cavern volumes. The experimental data on the bubble passage by visual observation was in a good agreement with the experimental results measured by Electrical Resistance Tomography.

Free Research Field

化学工学