Determination of a Bubble Drag Coefficient during the Formation of Single Gas Bubble in Upward Coflowing Liquid
Abstract
:1. Introduction
- —bubble diameter, m
- —gravitational acceleration, m/s2
- —liquid density, kg/m3
- —gas density, kg/m3
- —inner nozzle diameter, m
- —liquid surface tension, N/m
- —gas volumetric flow rate, m3/s
- —bubble detachment frequency, Hz
- —drag coefficient, -
- —area of influence of drag force, m2
- —liquid velocity, m/s
- —displacement of the center of mass of the bubble, m
- —time, s
- —mass, kg
- —gas volumetric flow rate, m3/s
- —volume, m3
- —modified Froude number (Sada et al. [22]), -
- —gas velocity, m/s
- —superficial liquid velocity, m/s
- —Bond number,
- —Froude number,
2. Materials and Methods
2.1. Materials
2.2. Experimental Setup
2.3. Experimental Procedures
2.4. Model Formulation
- —local liquid velocity at the point , m/s
- —mean liquid velocity in the column, m/s
- —coefficient depending on the velocity profile shape, -
- —column width, m
- , —location coordinates in the column cross-section relative to the column axis, m
3. Results
3.1. Velocity Profile
3.2. Drag Coefficient
3.3. Comparison with Drag Coefficient Calculated Using the Equation for Bubble Rising
3.4. Validation of Experimental Drag Coefficient Correlation
4. Discussion
Author Contributions
Funding
Conflicts of Interest
Nomenclature
Symbols: | |
area of influence of drag force, m2 | |
, | coefficients, - |
Bond number, - | |
drag coefficient, - | |
conversion factor for conversion diameter in pixels to meters, m/pixel | |
bubble diameter, m | |
horizontal bubble diameter, m | |
inner nozzle diameter, m | |
outer nozzle diameter, m | |
bubble detachment frequency, Hz | |
Froude number, - | |
modified Froude number (Sada et al. [22]), - | |
gravitational acceleration, m/s2 | |
column width, m | |
mass, kg | |
coefficient depending on the velocity profile shape, - | |
gas volumetric flow rate, m3/s | |
Reynolds number, - | |
bubble projection surface, pixels | |
displacement of the center of mass of the bubble, m | |
time, s | |
superficial liquid velocity, m/s | |
gas velocity, m/s | |
liquid velocity, m/s | |
mean liquid velocity in the column, m/s | |
tracer settling velocity, m/s | |
volume, m3 | |
, | location coordinates in the column cross-section relative to the column axis, m |
Greek Symbols: | |
liquid dynamic viscosity coefficient, Pa·s | |
gas density, kg/m3 | |
liquid density, kg/m3 | |
liquid surface tension, N/m |
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Parameter | Symbol | Value |
---|---|---|
Gas density | 1.23 kg/m3 | |
Liquid density | 1000 kg/m3 | |
Liquid viscosity | 1.31 10−3 Pa·s | |
Liquid surface tension | 7.42 10−2 N/m |
Nozzle Number | Symbol | ||
---|---|---|---|
I | 0.8/1.0 | 0.80 ± 0.01 | 1.00 ± 0.01 |
II | 1.0/1.2 | 1.00 ± 0.01 | 1.20 ± 0.01 |
III | 1.2/1.4 | 1.20 ± 0.01 | 1.40 ± 0.01 |
IV | 1.4/1.6 | 1.40 ± 0.01 | 1.60 ± 0.01 |
V | 1.6/1.8 | 1.60 ± 0.01 | 1.80 ± 0.01 |
VI | 1.8/2.0 | 1.80 ± 0.01 | 2.00 ± 0.01 |
VII | 1.1/2.0 | 1.10 ± 0.01 | 2.00 ± 0.02 |
VIII | 1.6/2.5 | 1.60 ± 0.01 | 2.50 ± 0.02 |
IX | 2.1/3.0 | 2.10 ± 0.01 | 3.00 ± 0.02 |
(28) | (29) | (30) | ||
---|---|---|---|---|
(31) | 0.916 | 0.861 | 0.709 | |
(32) | 0.994 | 0.987 | 0.903 | |
(33) | 0.727 | 0.772 | 0.936 |
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Luty, P.; Prończuk, M. Determination of a Bubble Drag Coefficient during the Formation of Single Gas Bubble in Upward Coflowing Liquid. Processes 2020, 8, 999. https://doi.org/10.3390/pr8080999
Luty P, Prończuk M. Determination of a Bubble Drag Coefficient during the Formation of Single Gas Bubble in Upward Coflowing Liquid. Processes. 2020; 8(8):999. https://doi.org/10.3390/pr8080999
Chicago/Turabian StyleLuty, Przemysław, and Mateusz Prończuk. 2020. "Determination of a Bubble Drag Coefficient during the Formation of Single Gas Bubble in Upward Coflowing Liquid" Processes 8, no. 8: 999. https://doi.org/10.3390/pr8080999