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contributor authorK. J. Cassidy
contributor authorN. Gavriely
contributor authorJ. B. Grotberg
date accessioned2017-05-09T00:04:10Z
date available2017-05-09T00:04:10Z
date copyrightDecember, 2001
date issued2001
identifier issn0148-0731
identifier otherJBENDY-26209#580_1.pdf
identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/124773
description abstractA finite-length liquid plug may be present in an airway due to disease, airway closure, or by direct instillation for medical therapy. Air forced by ventilation propagates the plug through the airways, where it deposits fluid onto the airway walls. The plug may encounter single or bifurcating airways, an airway surface liquid, and other liquid plugs in nearby airways. In order to understand how these flow situations influence plug transport, benchtop experiments are performed for liquid plug flow in: Case (i) straight dry tubes, Case (ii) straight pre-wetted tubes, Case (iii) bifurcating dry tubes, and Case (iv) bifurcating tubes with a liquid blockage in one daughter. Data are obtained for the trailing film thickness and plug splitting ratio as a function of capillary number and plug volumes. For Case (i), the finite length plug in a dry tube has similar behavior to a semi-infinite plug. For Case (ii), the trailing film thickness is dependent upon the plug capillary number (Ca) and not the precursor film thickness, although the shortening or lengthening of the liquid plug is influenced by the precursor film. For Case (iii), the plug splits evenly between the two daughters and the deposited film thickness depends on the local plug Ca, except for a small discrepancy that may be due to an entrance effect or from curvature of the tubes. For Case (iv), a plug passing from the parent to daughters will deliver more liquid to the unblocked daughter (nearly double, consistently) and then the plug will then travel at greater Ca in the unblocked daughter as the blocked. The flow asymmetry is enhanced for a larger blockage volume and diminished for a larger parent plug volume and parent-Ca.
publisherThe American Society of Mechanical Engineers (ASME)
titleLiquid Plug Flow in Straight and Bifurcating Tubes
typeJournal Paper
journal volume123
journal issue6
journal titleJournal of Biomechanical Engineering
identifier doi10.1115/1.1406949
journal fristpage580
journal lastpage589
identifier eissn1528-8951
keywordsFlow (Dynamics)
keywordsFluids
keywordsBifurcation AND Film thickness
treeJournal of Biomechanical Engineering:;2001:;volume( 123 ):;issue: 006
contenttypeFulltext


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