TY - JOUR
T1 - Spatially resolved mass transfer coefficient for moderate Reynolds number flows in packed beds
T2 - Wall effects
AU - Bale, Shivkumar
AU - Sathe, Mayur
AU - Ayeni, Oladapo
AU - Berrouk, Abdallah S.
AU - Joshi, Jyeshtharaj
AU - Nandakumar, Krishnaswamy
N1 - Publisher Copyright:
© 2017 Elsevier Ltd
PY - 2017
Y1 - 2017
N2 - In this paper, Direct Numerical Simulation (DNS) was performed to understand the effects of confining walls on mass transfer through a packed bed for laminar regime (Re ≤ 100). The X, Y and Z coordinates of the center of the spheres in a randomly packed bed with varying ratios D/d (D is the diameter of the column and d is the diameter of the particle) were generated using a Discrete Element Method - Computational Fluid Dynamics (DEM-CFD) code. Naphthalene-air system (Sc ∼ 2.52) was considered for all the cases. The grid resolution, method and boundary conditions were validated by comparing the computed (overall) Sherwood number with the published experimental data. Local Sherwood number was computed around each particle for all ratios, D/d, and spatial and probability distributions throughout the packed bed column as a function of D/d are reported. It was observed that for D/d's ≤ 8.6, the effects of wall on particle's Sherwood number was evident, while for D/d's ≥ 10.8, the Sherwood number was predominantly uniform all through the column.
AB - In this paper, Direct Numerical Simulation (DNS) was performed to understand the effects of confining walls on mass transfer through a packed bed for laminar regime (Re ≤ 100). The X, Y and Z coordinates of the center of the spheres in a randomly packed bed with varying ratios D/d (D is the diameter of the column and d is the diameter of the particle) were generated using a Discrete Element Method - Computational Fluid Dynamics (DEM-CFD) code. Naphthalene-air system (Sc ∼ 2.52) was considered for all the cases. The grid resolution, method and boundary conditions were validated by comparing the computed (overall) Sherwood number with the published experimental data. Local Sherwood number was computed around each particle for all ratios, D/d, and spatial and probability distributions throughout the packed bed column as a function of D/d are reported. It was observed that for D/d's ≤ 8.6, the effects of wall on particle's Sherwood number was evident, while for D/d's ≥ 10.8, the Sherwood number was predominantly uniform all through the column.
KW - Direct numerical simulation (DNS)
KW - Mass transfer
KW - Packed bed
KW - Wall effects
UR - http://www.scopus.com/inward/record.url?scp=85015982174&partnerID=8YFLogxK
U2 - 10.1016/j.ijheatmasstransfer.2017.03.052
DO - 10.1016/j.ijheatmasstransfer.2017.03.052
M3 - 文章
AN - SCOPUS:85015982174
SN - 0017-9310
VL - 110
SP - 406
EP - 415
JO - International Journal of Heat and Mass Transfer
JF - International Journal of Heat and Mass Transfer
ER -