Masters Theses

Ahmed Jasim

Abstract

"In this study, the impact of configuration and size of vertical heat exchanging internals in bubble columns on gas holdup, specific gas-liquid interfacial area, bubble chord length, and bubble rise velocity were investigated. Three different configurations of internals, each covering 25% of the column's cross-sectional area, were used to simulate the heat exchanging tubes utilized in the F-T process. The First configuration is a circular-like arrangement of 0.5 inch diameter vertical rods, whereas the second is a hexagonal-like arrangement of 0.5 inch diameter vertical rods. The third configuration is also a circular arrangement but of 1 inch diameter vertical rods used to examine the effect heat exchanging tubes diameter on the hydrodynamics. The experiments were carried out in a 14 cm inner diameter Plexiglas bubble column using air-water system, at superficial gas velocities in the range of 0.02 to 0.45 m/s, measured based on free cross-sectional area of the column available for fluid flow. 4-point optical fiber probe technique was used to collect the diameter profiles of the hydrodynamic parameters. In comparison to bubble column without internals, the obtained result showed that the configuration of the internals significantly affect the hydrodynamics and also the flow resistance inside the column. Steeper gas holdup and specific interfacial area profiles observed when the 0.5 inch circular arrangement internals is used. A distinct asymmetrical radial profiles of gas holdup and specific interfacial area were obtained when the hexagonal arrangement is used. The 1 inch internals enhanced the gas holdup and specific interfacial area near to the wall regions. In the churn turbulent regime, Bubbles chord length and bubbles rise velocity were found to be larger with the presence of internals when compared to bubble column without internals"--Abstract, page iv.

Advisor(s)

Al-Dahhan, Muthanna H.

Committee Member(s)

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

Department(s)

Chemical and Biochemical Engineering

Degree Name

M.S. in Chemical Engineering

Publisher

Missouri University of Science and Technology

Publication Date

Spring 2016

Journal article titles appearing in thesis/dissertation

  • Impact of internals configuration on gas holdup and bubble properties in a bubble column for the Fischer-Tropsch synthesis
  • Impact of heat exchanging internals diameter on gas holdup and bubble dynamics in a bubble column

Pagination

xi, 96 pages

Note about bibliography

Includes bibliographical references.

Rights

© 2016 Ahmed Jasim, All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

Subject Headings

Bubbles -- Dynamics -- ModelsBubbles -- Dynamics -- Computer simulationFischer-Tropsch process -- ModelsFischer-Tropsch process -- Computer simulation

Thesis Number

T 10877

Electronic OCLC #

952594556

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