Masters Theses


"In this study, the hydrodynamic, i.e. flow regime identification, line average liquid holdup, and the internal liquid holdup of a co-current moving packed bed reactor were studied. For the sake of hydrodynamics study, moving bed reactor is investigated as two-phase upflow packed bed reactor. Scaled down configuration was used to simulate of the moving bed reactors utilized in the industrial process. First, line average liquid holdup is measured with different geometrical configurations covering empty, dry, wet, and packed column under flowrates operation conditions. A new methodology has been developed to determine the line average liquid holdup for a porous catalyst. Second, flow regime is identified by variation of superficial gas velocity at constant liquid superficial velocity. The experiments were carried out in an 11 - inch inner diameter Plexiglas column using the air-water system, at superficial gas velocities in the range of 0.6 to 7.7 cm/s and at a constant liquid superficial velocity of 0.017 cm/s. Gamma ray densitometry (GRD) technique was used to obtain the line average liquid holdup and to identify the flow regime at different axial and radial positions along the column. The obtained results showed that the flow regimes are bubble flow and pulse flow regimes with a transition flow in-between under the operation conditions used. The result showed that the liquid holdup decreased as the superficial gas velocity increased. It was also found that the liquid holdup radial distribution was not uniform. These kinds of information are essential to improve the performance of the reactor"--Abstract, page iv.


Al Dahhan, Muthanna H.

Committee Member(s)

Neogi, P. (Partho), 1951-
Park, Joontaek


Chemical and Biochemical Engineering

Degree Name

M.S. in Chemical Engineering


Missouri University of Science and Technology

Publication Date

Fall 2016

Journal article titles appearing in thesis/dissertation

  • Liquid holdup studies in a co-current gas liquid upflow moving packed bed reactor with porous catalyst using gamma ray densitometry
  • Identification of flow regime in a co-current gas {13} liquid upflow moving packed beds reactor using gamma ray densitometry


xi, 103 pages

Note about bibliography

Includes bibliographical references.


© 2016 Ali Toukan

Document Type

Thesis - Open Access

File Type




Subject Headings

Fixed bed reactors
Two-phase flow -- Computer simulation
Mass transfer -- Mathematical models

Thesis Number

T 11054

Electronic OCLC #