Abstract
Increasing emphasis has been put on the occurrence of turbulent blood flow in the great arteries in humans and on the possible role of this phenomenon in various pathological vascular conditions. The hot-film anemometer has been widely used to register fluid velocity (and turbulence—if any). In the present paper the dynamic properties of a commercially available hot-film anemometer system are determined. Simulating a turbulent velocity component, a conical 1 mm needle probe was vibrated with a frequency from 10–2000 Hz in rotating steady state human heparinised whole blood, varying the laminar velocity from 5 to 150 cm s−1. Both the sine sweep test and the random noise test were used for frequency response determinations. No significant difference was found between the results from the tests. The cut-off frequency (−3 dB) increased with increasing laminar velocity as a second order function (e.g. 200, 500 and 1500 Hz at laminar velocities of 25, 50 and 100 cm s−1). The cut-off frequency decreased to a minor degree with increasing amplitude of the turbulent velocity component. It is concluded that the hot-film anemometer system with the used conical quartz coated blood velocity probe is well suited for in vivo turbulence analysis on the arterial side.
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Paulsen, P.K., Hasenkam, J.M., Nygaard, H. et al. Analysis of the dynamic properties of a hot-film anemometer system for blood velocity measurements in humans. Med. Biol. Eng. Comput. 25, 195–200 (1987). https://doi.org/10.1007/BF02442850
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DOI: https://doi.org/10.1007/BF02442850