Doctoral Dissertations


Neven Y. Ali

Keywords and Phrases

3D Velocity Fields; Cross sectional distribution; Gamma ray computed tomography (CT); Radioactive Particle Tracking (RPT); Scale-up; Spouted beds


"The work focuses on implementing for the first time advanced non-invasive measurement techniques to evaluate the scale-up methodology of gas-solid spouted beds for hydrodynamics similarity that has been reported in the literature based on matching dimensionless groups and the new mechanistic scale up methodology that has been developed in our laboratory based on matching the radial profile of gas holdup since the gas dynamics dictate the hydrodynamics of the gas-solid spouted beds. These techniques are gamma-ray computed tomography (CT) to measure the cross-sectional distribution of the phases' holdups and their radial profiles along the bed height and radioactive particle tracking (RPT) to measure in three-dimension (3D) solids velocity and their turbulent parameters. The measured local parameters and the analysis of the results obtained in this work validate our new methodology of scale up of gas-solid spouted beds by comparing for the similarity the phases' holdups and the dimensionless solids velocities and their turbulent parameters that are non-dimensionalized using the minimum spouting superficial gas velocity. However, the scale-up methodology of gas-solid spouted beds that is based on matching dimensionless groups has not been validated for hydrodynamics similarity with respect to the local parameters such as phases' holdups and dimensionless solids velocities and their turbulent parameters. Unfortunately, this method was validated in the literature by only measuring the global parameters. Thus, this work confirms that validation of the scale-up methods of gas-solid spouted beds for hydrodynamics similarity should reside on measuring and analyzing the local hydrodynamics parameters"--Abstract, page iv.


Al-Dahhan, Muthanna H.

Committee Member(s)

Lee, Hyoung-Koo
Castano Giraldo, Carlos Henry
Alajo, Ayodeji Babatunde
Liang, Xinhua


Nuclear Engineering and Radiation Science

Degree Name

Ph. D. in Nuclear Engineering


Nuclear Energy Research Initiative (U.S.)


Financial support of US Department of Energy - Nuclear Energy Research Initiative (DOE-NERI) grant (NERI DEFC07-07ID14822)


Missouri University of Science and Technology

Publication Date

Spring 2016

Journal article titles appearing in thesis/dissertation

  • Demonstrating the non-similarity in local holdups of gas-solid spouted beds obtained by CT with scale-up methodology based on dimensionless groups
  • An advanced evaluation of spouted beds scale-up for coating TRISO nuclear fuel particles using radioactive particle tracking (RPT)
  • Evaluating the new mechanistic scale-up methodology of gas-solid spouted beds using gamma ray computed tomography (CT)
  • An advanced evaluation the new mechanistic scale-up methodology of gas-solid spouted using radioactive particle tracking (RPT)


xvii, 238 pages

Note about bibliography

Includes bibliographic references.


© 2016 Neven Y Ali, All rights reserved.

Document Type

Dissertation - Open Access

File Type




Subject Headings

Fast reactors -- Computer simulation
Superheating reactors -- Computer simulation
Two-phase flow -- Computer simulation
Gas-solid interfaces -- Computer simulation
Gamma ray detectors

Thesis Number

T 10902

Electronic OCLC #