LASER-DOPPLER AND HOT-FILM ANEMOMETERS FOR MEASUREMENT OF UNSTEADY TURBULENT FLOW BEHIND A PROSTHETIC HEART VALVE.

J. Seki, K. Hayashi, T. Nakamura, M. Umezu

Research output: Contribution to conferencePaper

Abstract

Temporal and spatial resolutions of hot-film anemometer (CTA) and laser-Doppler anemometer (LDA) were studied on the unsteady turbulent flow generated behind a prosthetic heart valve under pulsatile flow condition. Frequency response was lower in the LDA measurements (approximately 1 kHz) than in the CTA ones (approximately 6 kHz). Although the calculated dimensions of the LDA sampling volume were 0. 06 mm in diameter and 0. 4 mm in length, the actual dimensions were estimated to be about 0. 3 mm and 1 mm, respectively. The CTA measurement was influenced by the partial blockage of flow caused by the CTA probe.

Original languageEnglish
Pages149-154
Number of pages6
Publication statusPublished - 1985 Dec 1
Externally publishedYes

ASJC Scopus subject areas

  • Engineering(all)

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