A New Approach to Engineering: Career & Research

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An innovative presentation on new engineering technology in research at UCD Dublin. A short review of Bubble Columns of general interest but especially for the casual enthusiast!

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A New Approach to Engineering: Career & Research

  1. 1. Investigation into Hydrodynamics, Dispersion and Mass-Transfer in a Bubble Column
  2. 2. Chemical Engineering Research Presentation <ul><li>Applications in both the Oil & Gas Industry, Bulk Chemical Manufacture as well as Industrial Microbiology </li></ul><ul><li>Fischer-Tropsch Applied Study </li></ul>Study conducted under academic supervision in Dublin, Ireland. Self-Published to Promote Engineering on the Interweb.
  3. 3. ii) Scope of Review <ul><li>Hydrodynamics [60] </li></ul><ul><ul><li>Impingement Plate Study </li></ul></ul><ul><ul><li>Instrument Noise Characterisation </li></ul></ul><ul><ul><li>Directionality in Measurements </li></ul></ul><ul><li>Dispersion [30] </li></ul><ul><ul><li>Characterisation of Mixing in a Bubble Column </li></ul></ul><ul><li>Mass-Transfer [10] </li></ul><ul><ul><li>Study of Mass-Transfer in a Bubble Column </li></ul></ul>
  4. 4. 1. Hydrodynamics <ul><li>Study of Fluid Properties/Flow </li></ul><ul><ul><li>Conservation Laws </li></ul></ul><ul><ul><li>Newtonian Fluid Behaviour </li></ul></ul><ul><ul><li>Enhanced Process Understanding </li></ul></ul><ul><li>Focused upon Measuring Dispersion </li></ul><ul><ul><li>Standard Inert Test …the black-box approach </li></ul></ul><ul><li>Optimise & Control Sources of Error </li></ul><ul><ul><li>Tracer Injection </li></ul></ul><ul><ul><li>Tracer Measurement Recordings </li></ul></ul>
  5. 5. 1.1 Impingement Plate Study <ul><li>Description </li></ul><ul><li>D.O.E </li></ul><ul><li>Challenges </li></ul><ul><ul><li>An efficient Injection Pulse </li></ul></ul><ul><ul><li>Optimise Radial Dispersion </li></ul></ul>
  6. 6. 1.1 Impingement Plate Study <ul><li>Gaussian Plume Modelled </li></ul><ul><li>Dissipation of Mass/Energy </li></ul>
  7. 7. 1.1 Results, Conclusions, Caveats <ul><li>Effects of Critical Variables: </li></ul><ul><li>Gas Flow Rate Changing Mechanisms of Dispersion </li></ul><ul><li>Plate Separation Buoyant Effects, Dispersion Ratio </li></ul><ul><li>Plate Geometry Impingement Characteristics </li></ul><ul><li>Tracer Concentration Viscosity, Density Effects </li></ul><ul><li>Plate Size Energy Losses, Liquid Pooling </li></ul>
  8. 8. 1.2 Instrument Signal Analysis Comment : Un-Filtered Data
  9. 9. 1.2 Noise Characterisation 
  10. 10. 1.3 Optimum Conductivity Probe Orientation in Two-Phase Flow Window 1.03 1.60 1.35 0.67 45 1.04 1.65 1.30 1.29 60 0.35 0.22 0.49 0.54 -45 1.41 1.14 0.89 0.29 -60 1.10 1.74 1.06 0.89 0 SE H NE N Position
  11. 11. 1.3 Directionality in Readouts
  12. 12. 1.3 Window Projection Residence Time Theory Position 3.18 2.25 4.5 2.25 3.18 135 o 1.28 2.75 6 3 4.24 90 o 3.18 2.25 4.5 2.25 3.18 45 o 0.64 1.38 3 1.5 2.12 0 o 135 o 120 o 90 o 60 o 45 o Window
  13. 13. 1.3 Results, Conclusions, Caveats <ul><li>Optimum Probe Position and Window Orientation </li></ul><ul><li>Bubble Column: </li></ul><ul><ul><li>Variability Consistent </li></ul></ul><ul><ul><li>Linked with theory </li></ul></ul><ul><li>Similarity between Columns established </li></ul><ul><ul><li>Noise analysis </li></ul></ul><ul><ul><li>Geometrical Scales </li></ul></ul>Two parameters characterised RTD could be interpreted with a degree of understanding
  14. 14. 2. Dispersion <ul><li>Dispersion helps us to understand the flow behaviour of certain materials </li></ul><ul><li>It occurs in this study as a fluid-fluid interaction </li></ul><ul><li>Characterisation of dispersion would allow a rigorous mathematical model to be applied </li></ul>
  15. 15. 2. Axial Dispersion Model  /L Time Comment : Notable Similarities to Control Theory
  16. 16. 2. Dispersion
  17. 17. 2. Dispersion Selected RTD for Pulse Injection Dispersion mechanisms evident – Expected Result ?
  18. 18. 3. Mass Transfer <ul><li>Mass Transfer is concerned with the analyses of behaviour on a molecular level </li></ul><ul><li>Bubble Columns are understood to relate primarily to macroscopic phenomena </li></ul><ul><li>Measurement of k L a </li></ul><ul><li>Dissolved Oxygen Measurements </li></ul>
  19. 19. 3. Mass Transfer of CO 2 Exponential Model to fit Data, Regression Coefficient of 0.9995
  20. 20. 3. Improved Dispersion Model Comment : Agreement of Experimental Data with Predictive Theory
  21. 21. Questions ? © Copyright 2007-2010 Please contact me with any comments or suggestions

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