Spatially resolved mass transfer coefficient for moderate Reynolds number flows in packed beds: Wall effects

Shivkumar Bale*, Mayur Sathe, Oladapo Ayeni, Abdallah S. Berrouk, Jyeshtharaj Joshi, Krishnaswamy Nandakumar

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)406-415
Number of pages10
JournalInternational Journal of Heat and Mass Transfer
Volume110
DOIs
StatePublished - 2017
Externally publishedYes

Keywords

  • Direct numerical simulation (DNS)
  • Mass transfer
  • Packed bed
  • Wall effects

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