Experimental value of the Reynolds critical flow in the human airway

Journal/Book: Reprinted from THE JOURNAL OF LABORATORY AND CLINICAL MEDICINE St. Louis Vol. 67 No. 1 Pages 43-57 January 1966. 1966;

Abstract: From the Cardiopulmonary Laboratory Creighton Memorial St. Joseph's Hospital and the Nebraska Heart Association Chair of Cardiovascular Research Department of Medicine Creighton University School of Medicine. This investigation was supported by Research Grant H-1951 from the National Heart Institute of the National Institutes of Health United States Public Health Service and by a research grant for "Normal Standards" from the Nebraska Tuberculosis Association. Received for publication Nov. 13 1964. Accepted for publication Aug. 11 1965. *Medical Student Research Fellows of the United States Public Health Service. Despite constancy of the pattern of flow throughout a single passive deflation marked variability has been found between patterns of flow at low flow rates in successive passive deflations in humans and this variability suggests a similar variability from laminar to turbulent in the type of flow in some airways during normal breathing. This variability seems to furnish the most direct numerical validation thus far of the theoretical calculations by Gaensler Maloney and Björk which indicated that the critical flow for turbulence in the larger human airways is reached during normal respiration. Similar validation has previously been furnished by the experiments of Mcllroy Selverstone Mead and Radford who measured human airway resistance while varying the viscosity and ... schö

Zurück | Weiter