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International Symposium on Imaging in Transport Processes.
May, 25-29, 1992, Athens, Greece

DOI: 10.1615/ICHMT.1992.IntSympImgTranspProc


ISBN Print: 978-1-56700-012-2

ULTRASOUND IMAGING AND FOURIER ANALYSIS OF A VELOCITY FIELD

pages 141-153
DOI: 10.1615/ICHMT.1992.IntSympImgTranspProc.150
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ABSTRACT

Imaging of flow fields has a very important role in the study of fluid flow and heat transfer, but there is an essentially different meaning between experimental work and numerical work. In experimental work, flow visualization comes first for the intuitive understanding of the flow fields, followed by derivation of quantitative velocity fields. In numerical work, on the other hand, a computation of velocity fields is performed first, from which its visualization is made for a visual check of the computed results and to further an intuitive understanding. Even as the capability of computer resources becomes much higher, the above difference is essential and cannot be resolved.
We took another approach by developing a new method for measuring the velocity field, using an ultrasound velocity profile monitor (UVP). The new technique, as described below, can obtain an instantaneous velocity profile in one dimension, say Vz(z,t), from which the flow is visualized. This approach follows exactly the numerics approach, since the velocity field is obtained quantitatively.

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