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Research Interest
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| In our research, we focus on dispersed multiphase flows, like gas bubbles in water or granular matter and
powders in a gas stream. The focus is on industrial reactors, like bubble columns and fluidized beds. However, the research
portfolio is broader and at the moment encompasses for example in-line separation of oil from water for the oil and gas
production. Both numerical simulations and advanced experiments are carried out. Some examples are given here. For more information, please visit our multiphase flow pages. Very Uniform Bubbly FlowUsing a special needle sparger (with 561 needles), bubbly flow in a bubble column can be uniform up to 55%. Bubbles rise with virutally all the same velocity and have the sime sizes. The large scale liquid circulation, that is usually present in bubble columns at these gas fractions, is absent.Fast X-ray TomographyOne of the difficulties with experiments in multiphase flows, is the opaque nature of most multiphase systems. Consequently, laser-based techniques are of limited use. However, matter is to a certain extend transparant to X-rays. We exploit this in our fast X-ray CT scanner. With this device we can reconstruct the spatial distribution of the various phases in two parallel cross sections of the reactor. We can go up to maximum a diameter of 40cm, so we can study real reactors. At present we apply our X-ray scanner to bubbling fluidized beds. |
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