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Theoretical considerations suggest that phonatory flow is inherently unsteady when two related conditions apply: (1) that the unsteady and convective accelerations are commensurate, and (2) that the inertia of the glottal jet is non-negligible. Acceleration waveforms, computed from experimental data, show that unsteady and convective accelerations to be the same order of magnitude, throughout the cycle, and that the jet flow contributes significantly to the unsteady acceleration. In the middle of the cycle, however, jet inertia is negligible because the convective and unsteady accelerations nearly offset one another in the jet region. These results, consistent with previous findings treating quasisteady phonatory flow, emphasize that unsteady acceleration cannot be neglected during the final stages of the phonation cycle, during which voice sound power and spectral content are largely determined. Furthermore, glottal jet dynamics must be included in any model of phonatory airflow.<\/jats:p>","DOI":"10.1121\/1.3365312","type":"journal-article","created":{"date-parts":[[2010,7,19]],"date-time":"2010-07-19T15:51:11Z","timestamp":1279554671000},"page":"372-383","update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":16,"title":["Dynamics of temporal variations in phonatory flow"],"prefix":"10.1121","volume":"128","author":[{"given":"Michael H.","family":"Krane","sequence":"first","affiliation":[{"name":"Pennsylvania State University Applied Research Laboratory, , University Park, Pennsylvania 16804"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Michael","family":"Barry","sequence":"additional","affiliation":[{"name":"Massachusetts Institute of Technology Department of Mechanical Engineering, , Cambridge, Massachusetts 02139"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Timothy","family":"Wei","sequence":"additional","affiliation":[{"name":"Rensselaer Polytechnic Institute Department of Mechanical, Aerospace, and Nuclear Engineering, , Troy, New York 12180"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"231","published-online":{"date-parts":[[2010,7,16]]},"reference":[{"key":"2023071905112141300_c1","doi-asserted-by":"publisher","first-page":"577","DOI":"10.1115\/1.2817304","article-title":"An experimental study of pulsatile flow in canine larynges","volume":"117","year":"1995","journal-title":"ASME J. 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