Asymmetric Blade Disc Turbine for High Aeration Rates

1323 Views
551 Downloads
Export citation: ABNT
BOMBAČ, Andrej .
Asymmetric Blade Disc Turbine for High Aeration Rates. 
Strojniški vestnik - Journal of Mechanical Engineering, [S.l.], v. 64, n.9, p. 513-524, october 2018. 
ISSN 0039-2480.
Available at: <https://www.sv-jme.eu/article/asymmetric-blade-disc-turbine-for-high-aeration-rate-in-a-fermenter/>. Date accessed: 02 apr. 2020. 
doi:http://dx.doi.org/.
Bombač, A.
(2018).
Asymmetric Blade Disc Turbine for High Aeration Rates.
Strojniški vestnik - Journal of Mechanical Engineering, 64(9), 513-524.
doi:http://dx.doi.org/
@article{.,
	author = {Andrej  Bombač},
	title = {Asymmetric Blade Disc Turbine for High Aeration Rates},
	journal = {Strojniški vestnik - Journal of Mechanical Engineering},
	volume = {64},
	number = {9},
	year = {2018},
	keywords = {liquid mixing, air dispersing, gas holdup, ABT impeller, flooding, mixing time},
	abstract = {This paper presents some fluid-dynamic characteristics of modified impellers for air dispersion with high flow rates. An asymmetrically folded blade turbine (ABT) was developed and patented as the last in a series of research studies on modified blades of disk impellers, such as twisted blade turbine (TBT) and other blade shape turbines at the Faculty of Mechanical Engineering in Ljubljana. The analyses of the modified impeller characteristics in a model scale mixing device includes the measurements of: a) the mixing power in liquid stirring and in the air dispersion up to the occurrence of flooding, b) global gas hold up, c) appearance of flooding, and d) the mixing times in liquid stirring. The energy dissipation of the ABT impeller was found to be very small, in the range of hydrodynamic regimes in industrial scale operations with a power number equal to PoABT ~ 1.75. During aeration in water, the ABT impeller has a very small power draw reduction (less than 16 %) at the same stirrer speed (corresponding to Fr = 0.3) and is capable of dispersing substantially higher amounts of air (up to 53 %) than the Rushton turbine is, as well as achieving shorter mixing times. While local mixing time expresses only changes with the time at the measuring location, a CFD analysis was included for better insight into inhomogeneity in the liquid. To compare the efficacy of the ABT impeller with other impellers, some results of our previous research are summarized.},
	issn = {0039-2480},	pages = {513-524},	doi = {},
	url = {https://www.sv-jme.eu/article/asymmetric-blade-disc-turbine-for-high-aeration-rate-in-a-fermenter/}
}
Bombač, A.
2018 October 64. Asymmetric Blade Disc Turbine for High Aeration Rates. Strojniški vestnik - Journal of Mechanical Engineering. [Online] 64:9
%A Bombač, Andrej 
%D 2018
%T Asymmetric Blade Disc Turbine for High Aeration Rates
%B 2018
%9 liquid mixing, air dispersing, gas holdup, ABT impeller, flooding, mixing time
%! Asymmetric Blade Disc Turbine for High Aeration Rates
%K liquid mixing, air dispersing, gas holdup, ABT impeller, flooding, mixing time
%X This paper presents some fluid-dynamic characteristics of modified impellers for air dispersion with high flow rates. An asymmetrically folded blade turbine (ABT) was developed and patented as the last in a series of research studies on modified blades of disk impellers, such as twisted blade turbine (TBT) and other blade shape turbines at the Faculty of Mechanical Engineering in Ljubljana. The analyses of the modified impeller characteristics in a model scale mixing device includes the measurements of: a) the mixing power in liquid stirring and in the air dispersion up to the occurrence of flooding, b) global gas hold up, c) appearance of flooding, and d) the mixing times in liquid stirring. The energy dissipation of the ABT impeller was found to be very small, in the range of hydrodynamic regimes in industrial scale operations with a power number equal to PoABT ~ 1.75. During aeration in water, the ABT impeller has a very small power draw reduction (less than 16 %) at the same stirrer speed (corresponding to Fr = 0.3) and is capable of dispersing substantially higher amounts of air (up to 53 %) than the Rushton turbine is, as well as achieving shorter mixing times. While local mixing time expresses only changes with the time at the measuring location, a CFD analysis was included for better insight into inhomogeneity in the liquid. To compare the efficacy of the ABT impeller with other impellers, some results of our previous research are summarized.
%U https://www.sv-jme.eu/article/asymmetric-blade-disc-turbine-for-high-aeration-rate-in-a-fermenter/
%0 Journal Article
%R 
%& 513
%P 12
%J Strojniški vestnik - Journal of Mechanical Engineering
%V 64
%N 9
%@ 0039-2480
%8 2018-10-11
%7 2018-10-11
Bombač, Andrej.
"Asymmetric Blade Disc Turbine for High Aeration Rates." Strojniški vestnik - Journal of Mechanical Engineering [Online], 64.9 (2018): 513-524. Web.  02 Apr. 2020
TY  - JOUR
AU  - Bombač, Andrej 
PY  - 2018
TI  - Asymmetric Blade Disc Turbine for High Aeration Rates
JF  - Strojniški vestnik - Journal of Mechanical Engineering
DO  - 
KW  - liquid mixing, air dispersing, gas holdup, ABT impeller, flooding, mixing time
N2  - This paper presents some fluid-dynamic characteristics of modified impellers for air dispersion with high flow rates. An asymmetrically folded blade turbine (ABT) was developed and patented as the last in a series of research studies on modified blades of disk impellers, such as twisted blade turbine (TBT) and other blade shape turbines at the Faculty of Mechanical Engineering in Ljubljana. The analyses of the modified impeller characteristics in a model scale mixing device includes the measurements of: a) the mixing power in liquid stirring and in the air dispersion up to the occurrence of flooding, b) global gas hold up, c) appearance of flooding, and d) the mixing times in liquid stirring. The energy dissipation of the ABT impeller was found to be very small, in the range of hydrodynamic regimes in industrial scale operations with a power number equal to PoABT ~ 1.75. During aeration in water, the ABT impeller has a very small power draw reduction (less than 16 %) at the same stirrer speed (corresponding to Fr = 0.3) and is capable of dispersing substantially higher amounts of air (up to 53 %) than the Rushton turbine is, as well as achieving shorter mixing times. While local mixing time expresses only changes with the time at the measuring location, a CFD analysis was included for better insight into inhomogeneity in the liquid. To compare the efficacy of the ABT impeller with other impellers, some results of our previous research are summarized.
UR  - https://www.sv-jme.eu/article/asymmetric-blade-disc-turbine-for-high-aeration-rate-in-a-fermenter/
@article{{}{.},
	author = {Bombač, A.},
	title = {Asymmetric Blade Disc Turbine for High Aeration Rates},
	journal = {Strojniški vestnik - Journal of Mechanical Engineering},
	volume = {64},
	number = {9},
	year = {2018},
	doi = {},
	url = {https://www.sv-jme.eu/article/asymmetric-blade-disc-turbine-for-high-aeration-rate-in-a-fermenter/}
}
TY  - JOUR
AU  - Bombač, Andrej 
PY  - 2018/10/11
TI  - Asymmetric Blade Disc Turbine for High Aeration Rates
JF  - Strojniški vestnik - Journal of Mechanical Engineering; Vol 64, No 9 (2018): Strojniški vestnik - Journal of Mechanical Engineering
DO  - 
KW  - liquid mixing, air dispersing, gas holdup, ABT impeller, flooding, mixing time
N2  - This paper presents some fluid-dynamic characteristics of modified impellers for air dispersion with high flow rates. An asymmetrically folded blade turbine (ABT) was developed and patented as the last in a series of research studies on modified blades of disk impellers, such as twisted blade turbine (TBT) and other blade shape turbines at the Faculty of Mechanical Engineering in Ljubljana. The analyses of the modified impeller characteristics in a model scale mixing device includes the measurements of: a) the mixing power in liquid stirring and in the air dispersion up to the occurrence of flooding, b) global gas hold up, c) appearance of flooding, and d) the mixing times in liquid stirring. The energy dissipation of the ABT impeller was found to be very small, in the range of hydrodynamic regimes in industrial scale operations with a power number equal to PoABT ~ 1.75. During aeration in water, the ABT impeller has a very small power draw reduction (less than 16 %) at the same stirrer speed (corresponding to Fr = 0.3) and is capable of dispersing substantially higher amounts of air (up to 53 %) than the Rushton turbine is, as well as achieving shorter mixing times. While local mixing time expresses only changes with the time at the measuring location, a CFD analysis was included for better insight into inhomogeneity in the liquid. To compare the efficacy of the ABT impeller with other impellers, some results of our previous research are summarized.
UR  - https://www.sv-jme.eu/article/asymmetric-blade-disc-turbine-for-high-aeration-rate-in-a-fermenter/
Bombač, Andrej"Asymmetric Blade Disc Turbine for High Aeration Rates" Strojniški vestnik - Journal of Mechanical Engineering [Online], Volume 64 Number 9 (11 October 2018)

Authors

Affiliations

  • University of Ljubljana, Faculty of Mechanical Engineering, Slovenia 1

Paper's information

Strojniški vestnik - Journal of Mechanical Engineering 64(2018)9, 513-524

https://doi.org/10.5545/sv-jme.2017.5149

This paper presents some fluid-dynamic characteristics of modified impellers for air dispersion with high flow rates. An asymmetrically folded blade turbine (ABT) was developed and patented as the last in a series of research studies on modified blades of disk impellers, such as twisted blade turbine (TBT) and other blade shape turbines at the Faculty of Mechanical Engineering in Ljubljana. The analyses of the modified impeller characteristics in a model scale mixing device includes the measurements of: a) the mixing power in liquid stirring and in the air dispersion up to the occurrence of flooding, b) global gas hold up, c) appearance of flooding, and d) the mixing times in liquid stirring. The energy dissipation of the ABT impeller was found to be very small, in the range of hydrodynamic regimes in industrial scale operations with a power number equal to PoABT ~ 1.75. During aeration in water, the ABT impeller has a very small power draw reduction (less than 16 %) at the same stirrer speed (corresponding to Fr = 0.3) and is capable of dispersing substantially higher amounts of air (up to 53 %) than the Rushton turbine is, as well as achieving shorter mixing times. While local mixing time expresses only changes with the time at the measuring location, a CFD analysis was included for better insight into inhomogeneity in the liquid. To compare the efficacy of the ABT impeller with other impellers, some results of our previous research are summarized.

liquid mixing, air dispersing, gas holdup, ABT impeller, flooding, mixing time