By Alvin H. Sacks Ph.D. (auth.), Daniel J. Schneck (eds.)
The division of Engineering technological know-how and Hechanics at Virginia Polytechnic Institute and nation collage spon sored the 1st Mid-Atlantic convention on Bio-Fluid Mechanics, which used to be held in Blacksburg, Virginia throughout the interval Sep 11 August 1978. a few forty life-scientists, engineers, physicians and others who percentage a typical curiosity within the development of uncomplicated and utilized wisdom in bio fluid mechanics collected on the Donaldson Brown heart for carrying on with schooling to listen to 25 papers awarded in seven technical periods. on the end of the convention, these current made up our minds unanimously that its good fortune warranted having at the very least another -- and that it used to be conceptually a valid proposal to devise it on a biennial foundation for overdue spring. accordingly, the second one Mid-Atlantic convention on Bio Fluid Mechanics came about at Virginia Tech on may well 4-6, 1980. This quantity files the complaints of the second one convention. It includes complete texts of 23 contributed papers, 2 visitor lectures and 1 invited seminar. The papers are gr9uped in response to material, starting with three within the quarter of respiratory, by means of 1 in kidney dialysis, 1 in copy, 1 in joint lubrication, 1 in prosthetic fluidics, 2 in zoology, and finishing with 14 within the basic box of cardiovascular dynamics. Of the latter, five care for the topic of center valves, 2 challenge themselves with the microcirculation, 6 deal with vascular approach hemodynamics and 1 covers a few facets of blood rheology.
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Van de l'loestij ne and A. " In Airway Dynamics, ed. Arend Bouhuys, pp. 61-72, Charles C. Thomas, 1970. 3. : "Ueber die Wirkung der Bronchialmuskeln, Noch Einer Neuen Methode Untersucht und Ueber Asthma Nervesum," Arch. Ges. Physiol. 1892. 4. Fry,. L. E. Hyatt: "Pulmonary Mechanics. " Am. J. Med. 29:672-689, 1960, 5. M. Turner, P,T. B. " J. Appl. Physiol. 22:25-108, 1967. WILLIS G. DOWNING, JR. 36 6. , S. L. Riley, and B. " J. Appl. Physiol. 23 ( 5) :646-662, 1967. 7. S. Thesis, Hassachusetts Institute of Technology, April, 1974.
Note that the major resistance is found in the upper orders of airway with a peak occuring near the fourth order in agreement with experimental results 14 • The resistance values and the location of the peak resistance agree quite well with those obtained by Pedley, Schroter and Sudlow 3 for the case of inspiratory flow. However, their curve rises from order zero up to the peak while the present analysis yields a curve which falls before the peak even though both used the Weibel model 11 for the lung.
We believe it is a logical step toward a realistic model of the pressure gradient in the bronchial tree. EXPERIMENTAL METHOD Symmetric bifurcating networks were built using laboratory Y-connectors of constant internal diameter d. To help insure a smooth wall between adjacent connectors, each connector leg ~as cut with a diamond wafering blade to give a desired length i between bifurcations. The connectors were force-fit together with rigid plastic or stainless steel tubing to form the airway model, shown schematically in the insert of Fig.