| Abstract
| - The hydrodynamics of bubble columns operated at pressures up to 7.0 MPa are investigatedusing a laser Doppler velocimetry system. Laser Doppler velocimetry is a noninvasive opticaltechnique, which is used to conduct in situ measurements of velocity, with high spatial resolution,fast dynamic response, and the ability to detect flow. The axial and tangential velocities andthe Reynolds shear and normal stresses are analyzed and discussed in relation to large-scalestructures present in the flow. This study demonstrates the significance of the pressure effecton the flow field in bubble-column systems.
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