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International Heat Transfer Conference 13
Graham de Vahl Davis (open in a new tab) School of Mechanical and Manufacturing Engineering, University of New South Wales, Kensington, NSW, Australia
Eddie Leonardi (open in a new tab) Computational Fluid Dynamics Research Laboratory, School of Mechanical and Manufacturing Engineering, The University of New South Wales, Sydney, Australia 2052

ISSN Online: 2377-424X

ISBN CD: 1-56700-226-9

ISBN Online: 1-56700-225-0

MEASURING HOLD-UP AND CONVECTIVE TRANSPORT IN STRUCTURED PACKINGS FOR HEAT AND MASS TRANSFER USING X-RAY TOMOGRAPHY

page 12
DOI: 10.1615/IHTC13.p21.60
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SINOPSIS

In the present study, X-ray tomography and radiography are used to investigate two-phase flow in structured packings for heat and mass transfer. In addition, a contrast agent is used as a tracer to visualize streamlines and mixing within the liquid phase. X-ray radiography is used to non-invasively image liquid hold-up distribution in a column with Mellapak 250.Y (PP) structured packing in counter-current operation of water and air. The high spatial resolution of 300μm allows to detect hold-up peaks of only a few millimetres height. A quasi two-dimensional set-up with two sheets of structured packing material is used to investigate radial spreading of liquid via X-ray radiography. Film thickness on the packing is imaged. By the tracer technique, with sodium iodide for contrast enhancement, it is shown that the developed film flows at an angle of ±23° to the vertical. Little mixing between the sheets of packing is observed. X-ray tomography is employed to measure phase distribution in a column with structured packing. Again, a contrast enhancing tracer is used to visualize mixing and spreading. The results demonstrate how X-ray imaging with contrast agent as tracer allows to gain new insights into fluid dynamics in porous structures.

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