TY - JOUR
T1 - Large-eddy simulation of gas–liquid two-phase flow in a bubble column reactor using a modified sub-grid scale model with the consideration of bubble-eddy interaction
AU - Long, Shanshan
AU - Yang, Jie
AU - Huang, Xiaobing
AU - Li, Guang
AU - Shi, Weibin
AU - Sommerfeld, Martin
AU - Yang, Xiaogang
N1 - Funding Information:
This work was financially supported by the National Natural Science Foundation of China (Grant Nos. 21761132026 , 91534118 ). Shanshan Long would also acknowledge the support of a full Ph.D. scholarship of University of Nottingham Ningbo China.
Publisher Copyright:
© 2020 The Author(s)
PY - 2020/11
Y1 - 2020/11
N2 - The Eulerian–Eulerian Large-eddy simulations (LES) of gas–liquid two-phase flow in a cylindrical bubble column reactor have been conducted. When considering the turbulent eddy viscosity in LES, apart from the well-accepted contributions from shear turbulence and bubble induced turbulence (BIT), the effect of the interaction between entrained bubbles and eddies with a similar turbulence length scale to the sub-grid scale (SGS) cannot be neglected. With the consideration of the bubble response to the eddies on the induced sub-grid stresses, a modified SGS model, which incorporates the Stokes number, St, was proposed. The results of LES clearly indicate that the use of the modified SGS model can effectively capture the transient bubbly flow in the cylindrical bubble column. The power turbulent kinetic energy spectrum obtained in LES indicates that a slope similar to Komogorov -5/3 scaling law and the -3 scaling law can still be identified for a critical frequency f=10.70 Hz.
AB - The Eulerian–Eulerian Large-eddy simulations (LES) of gas–liquid two-phase flow in a cylindrical bubble column reactor have been conducted. When considering the turbulent eddy viscosity in LES, apart from the well-accepted contributions from shear turbulence and bubble induced turbulence (BIT), the effect of the interaction between entrained bubbles and eddies with a similar turbulence length scale to the sub-grid scale (SGS) cannot be neglected. With the consideration of the bubble response to the eddies on the induced sub-grid stresses, a modified SGS model, which incorporates the Stokes number, St, was proposed. The results of LES clearly indicate that the use of the modified SGS model can effectively capture the transient bubbly flow in the cylindrical bubble column. The power turbulent kinetic energy spectrum obtained in LES indicates that a slope similar to Komogorov -5/3 scaling law and the -3 scaling law can still be identified for a critical frequency f=10.70 Hz.
KW - Bubble column
KW - Large-eddy simulation
KW - Sub-grid scale model
KW - Turbulence modelling
UR - http://www.scopus.com/inward/record.url?scp=85089341555&partnerID=8YFLogxK
U2 - 10.1016/j.ijheatmasstransfer.2020.120240
DO - 10.1016/j.ijheatmasstransfer.2020.120240
M3 - Article
SN - 0017-9310
VL - 161
JO - International Journal of Heat and Mass Transfer
JF - International Journal of Heat and Mass Transfer
M1 - 120240
ER -