TY - JOUR
T1 - Stochastic DSMC method for dense bubbly flows
T2 - Methodology
AU - Kamath, S.
AU - Padding, J. T.
AU - Buist, K. A.
AU - Kuipers, J. A.M.
PY - 2018
Y1 - 2018
N2 - A stochastic Direct Simulation Monte Carlo (DSMC) method has been extended for handling bubble-bubble and bubble-wall collisions. Bubbly flows are generally characterized by highly correlated velocities due to presence of the surrounding liquid. The DSMC method has been improved to account for these kind of correlated collisions along with a treatment allowing the method to be used also at relatively high volume fractions. The method is first verified with the deterministic Discrete Particle/Bubble Model (DPM/DBM) using two problem cases: (a) dry granular flow of particles through two impinging nozzles and (b) 3D periodic bubble rise for mono-disperse and poly-disperse systems. The verification parameters are the total number of prevailing collisions within the system, the collision frequencies and the time-averaged liquid velocity profiles (only for the 3D-periodic bubble rise). Subsequently the method is applied to a lab-scale bubble column and validated with the experimental data of Deen et al. (2001). A computational performance comparison with the DBM is reported for the 3D periodic bubble rise case with varying overall gas fractions. The DSMC is approximately two orders of magnitude faster than the deterministic approach for the studied dense bubbly flow cases without adverse effects on the quality of the computational results.
AB - A stochastic Direct Simulation Monte Carlo (DSMC) method has been extended for handling bubble-bubble and bubble-wall collisions. Bubbly flows are generally characterized by highly correlated velocities due to presence of the surrounding liquid. The DSMC method has been improved to account for these kind of correlated collisions along with a treatment allowing the method to be used also at relatively high volume fractions. The method is first verified with the deterministic Discrete Particle/Bubble Model (DPM/DBM) using two problem cases: (a) dry granular flow of particles through two impinging nozzles and (b) 3D periodic bubble rise for mono-disperse and poly-disperse systems. The verification parameters are the total number of prevailing collisions within the system, the collision frequencies and the time-averaged liquid velocity profiles (only for the 3D-periodic bubble rise). Subsequently the method is applied to a lab-scale bubble column and validated with the experimental data of Deen et al. (2001). A computational performance comparison with the DBM is reported for the 3D periodic bubble rise case with varying overall gas fractions. The DSMC is approximately two orders of magnitude faster than the deterministic approach for the studied dense bubbly flow cases without adverse effects on the quality of the computational results.
KW - Bubbly flow
KW - Computational performance
KW - Direct Simulation Monte Carlo
KW - Discrete Bubble Model
KW - Experimental validation
UR - http://resolver.tudelft.nl/uuid:522058e8-eaf2-4e81-b9f6-2780498b6847
UR - http://www.scopus.com/inward/record.url?scp=85034642822&partnerID=8YFLogxK
U2 - 10.1016/j.ces.2017.11.002
DO - 10.1016/j.ces.2017.11.002
M3 - Article
AN - SCOPUS:85034642822
SN - 0009-2509
VL - 176
SP - 454
EP - 475
JO - Chemical Engineering Science
JF - Chemical Engineering Science
ER -