CHEMICAL REACTION ENGINEERING LABORATORY

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Presentation transcript:

CHEMICAL REACTION ENGINEERING LABORATORY Experimental Characterization of Gas-Liquid Column: Effect of nozzle orientation and pressure by Peter Spicka CHEMICAL REACTION ENGINEERING LABORATORY

Objectives Effect of nozzle orientation on gas hold-up and liquid velocity field studied at different pressures and UGS future comparison with Sandia’s experiments additional experimental database for CFD simulations Secondary goals effect of wavelet filtering on turbulence properties mastering both the CT and the CARPT technique

Experiment 6.375” stainless steel column Cross-sparger, two nozzle orientations: facing upward and downward Air-water system Dynamic height maintained at 11 D Pressure: 1 bar and 4 bars UGS= 5 cm/s (only CT) and 20 cm/s CARPT setup Typical setup, 30 detectors Only photo peak acquisition CT setup 5 detectors, 7 projections per view 4 axial levels: 2.5D; 3.5D; 5.5D; and 9D 1”

Gas holdup at UGS=20 cm/s and p=1 bar CT Results Effect of Nozzle Orientation- Global View Gas holdup at UGS=20 cm/s and p=1 bar nozzles facing downward nozzles facing upward Bubbles formed from nozzles facing upward are smaller Þ increased hold-up Similar behavior was found for all the studied regimes

Gas holdup at UGS=20 cm/s and p=1 bar CT Results Effect of Nozzle Orientation and Pressure Gas holdup at UGS=20 cm/s and p=1 bar UGS=5 cm/s UGS=20 cm/s Effect of nozzle orientation particularly pronounced at high pressure and high UGS diminishes with axial position

CARPT Results Liquid velocity & turb. kinetic energy profiles Indication of steeper axial velocity profiles for nozzles facing upward However, effect of nozzle orientation on liquid velocity is inconclusive ! Turbulent kinetic energy is higher for nozzles pointing downward at both pressures

CARPT Results Reynolds stresses Highly anisotropic flow ! UGS=20 cm/s , p = 1 bar nozzles pointing down nozzles pointing up Highly anisotropic flow ! However, the magnitude of Reynolds stresses is most likely overestimated. If typical UB~0.6 m/s and u’=O(UB) then u’u’ should be about 0.4 m2/s2 ! Þ hold-up fluctuations ?

Remarks: Wavelet Filtering Azimuthal velocity UF computed by: Devanathan Rados Cartesian components UGS=20 cm/s , p = 4 bar nozzles pointing down Magnitude of Reynolds stresses is only slightly affected by wavelet filtering In some cases, qualitatively different profiles !

Concluding Remarks Outlook for future Nozzle orientation CARPT data Significant effect on gas holdup and turbulent kinetic energy mainly near the column bottom More pronounced at high UGS and high pressure Effect on liquid velocity profiles is inconclusive CARPT data Overestimation of turbulent parameters due to gas holdup fluctuations Wavelet filtering slightly reduces Reynolds stresses but provides qualitatively different results Outlook for future Filtering Elimination of gas holdup fluctuations from CARPT data CFD Examination of lift forces and bubble-induced turbulence models in churn-turbulent regime and 3D column