Abstract
In order to understand effect of operating conditions on mass transfer between different phases in a mechanically stirred vessel, cold model study was carried out with liquid paraffin as a dispersion phase and ion-exchanged water as a continuous phase. Inner diameter of vessel, D, was varied in conjunction with both depth, H0, as D=H0=400 and 300 mm. Rotation speed, N, was changed between 50-240 rpm, volume ratio, Voil/V w, of dispersed to continuous phase was 5.9×10-2 and 1.2×10-1. Liquid/liquid mass transfer rate showed characteristic trend depending on liquid/liquid mixing pattern. It was kept nearly constant at lower level in the region I, monotonically increased in the region II except near the region III and its increasing rate decreased in the region II near the region III. Liquid/liquid mixing pattern was grouped into three regimes. I: the region where liquid/liquid interface did not arrive at the impeller, II: the region where liquid/liquid interface attained at impeller position, III: the region where gas/liquid interface touched impeller. Under the same supply rate of mixing energy, liquid/liquid mass transfer rate of mechanical stirring corresponded to that of gas stirring at a point in the region II. In the region I and the first half of II, liquid/ liquid mass transfer rate of gas stirring is larger than that of mechanical stirring, whereas that of gas stirring is smaller than that of mechanical stirring in the region III and the latter half of II. Gas/liquid mass transfer rate increased remarkably with an increase in N in the region III.
| Original language | English |
|---|---|
| Pages (from-to) | 87-93 |
| Number of pages | 7 |
| Journal | ISIJ International |
| Volume | 54 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 2014 |
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Keywords
- Gas stirring
- Gas/liquid mass transfer
- Liquid/liquid mass transfer
- Mechanical stirring
- Mixing pattern
- Slag-metal reaction
- Steelmaking
ASJC Scopus subject areas
- Mechanical Engineering
- Mechanics of Materials
- Materials Chemistry
- Metals and Alloys
Cite this
Mass transfer between different phases in a mechanicallystirred vessel and its comparison with that in a gas-stirred one. / Horiuchi, Shuhei; Uddin, Azhar; Katou, Yoshiei; Takahashi, Yukio; Uchida, Yu Ichi.
In: ISIJ International, Vol. 54, No. 1, 2014, p. 87-93.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Mass transfer between different phases in a mechanicallystirred vessel and its comparison with that in a gas-stirred one
AU - Horiuchi, Shuhei
AU - Uddin, Azhar
AU - Katou, Yoshiei
AU - Takahashi, Yukio
AU - Uchida, Yu Ichi
PY - 2014
Y1 - 2014
N2 - In order to understand effect of operating conditions on mass transfer between different phases in a mechanically stirred vessel, cold model study was carried out with liquid paraffin as a dispersion phase and ion-exchanged water as a continuous phase. Inner diameter of vessel, D, was varied in conjunction with both depth, H0, as D=H0=400 and 300 mm. Rotation speed, N, was changed between 50-240 rpm, volume ratio, Voil/V w, of dispersed to continuous phase was 5.9×10-2 and 1.2×10-1. Liquid/liquid mass transfer rate showed characteristic trend depending on liquid/liquid mixing pattern. It was kept nearly constant at lower level in the region I, monotonically increased in the region II except near the region III and its increasing rate decreased in the region II near the region III. Liquid/liquid mixing pattern was grouped into three regimes. I: the region where liquid/liquid interface did not arrive at the impeller, II: the region where liquid/liquid interface attained at impeller position, III: the region where gas/liquid interface touched impeller. Under the same supply rate of mixing energy, liquid/liquid mass transfer rate of mechanical stirring corresponded to that of gas stirring at a point in the region II. In the region I and the first half of II, liquid/ liquid mass transfer rate of gas stirring is larger than that of mechanical stirring, whereas that of gas stirring is smaller than that of mechanical stirring in the region III and the latter half of II. Gas/liquid mass transfer rate increased remarkably with an increase in N in the region III.
AB - In order to understand effect of operating conditions on mass transfer between different phases in a mechanically stirred vessel, cold model study was carried out with liquid paraffin as a dispersion phase and ion-exchanged water as a continuous phase. Inner diameter of vessel, D, was varied in conjunction with both depth, H0, as D=H0=400 and 300 mm. Rotation speed, N, was changed between 50-240 rpm, volume ratio, Voil/V w, of dispersed to continuous phase was 5.9×10-2 and 1.2×10-1. Liquid/liquid mass transfer rate showed characteristic trend depending on liquid/liquid mixing pattern. It was kept nearly constant at lower level in the region I, monotonically increased in the region II except near the region III and its increasing rate decreased in the region II near the region III. Liquid/liquid mixing pattern was grouped into three regimes. I: the region where liquid/liquid interface did not arrive at the impeller, II: the region where liquid/liquid interface attained at impeller position, III: the region where gas/liquid interface touched impeller. Under the same supply rate of mixing energy, liquid/liquid mass transfer rate of mechanical stirring corresponded to that of gas stirring at a point in the region II. In the region I and the first half of II, liquid/ liquid mass transfer rate of gas stirring is larger than that of mechanical stirring, whereas that of gas stirring is smaller than that of mechanical stirring in the region III and the latter half of II. Gas/liquid mass transfer rate increased remarkably with an increase in N in the region III.
KW - Gas stirring
KW - Gas/liquid mass transfer
KW - Liquid/liquid mass transfer
KW - Mechanical stirring
KW - Mixing pattern
KW - Slag-metal reaction
KW - Steelmaking
UR - http://www.scopus.com/inward/record.url?scp=84894263661&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84894263661&partnerID=8YFLogxK
U2 - 10.2355/isijinternational.54.87
DO - 10.2355/isijinternational.54.87
M3 - Article
AN - SCOPUS:84894263661
VL - 54
SP - 87
EP - 93
JO - ISIJ International
JF - ISIJ International
SN - 0915-1559
IS - 1
ER -