Results 241 to 250 of about 73,555 (300)
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Annals of Biomedical Engineering, 1984
Turbulence during pulsatile flow has been suggested as a possible mechanism to enhance the transport of gases during high-frequency ventilation. Experimental studies on oscillatory flow in straight, circular tubes have identified three types of flow: (a) laminar; (b) conditionally turbulent, in which high-frequency disturbances occur during the ...
D C, Winter, R M, Nerem
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Turbulence during pulsatile flow has been suggested as a possible mechanism to enhance the transport of gases during high-frequency ventilation. Experimental studies on oscillatory flow in straight, circular tubes have identified three types of flow: (a) laminar; (b) conditionally turbulent, in which high-frequency disturbances occur during the ...
D C, Winter, R M, Nerem
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New England Journal of Medicine, 1972
Hence does arise the action and function of the heart, which by pulsation it performs. [William Harvey, De Motu Cordis, 1628.] THE study of blood flow as a pulsatile phenomenon is scarcely new, but it has gained new impetus from three recent developments: the commercial production of reliable blood flowmeters, the formulation of theories appropriate to
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Hence does arise the action and function of the heart, which by pulsation it performs. [William Harvey, De Motu Cordis, 1628.] THE study of blood flow as a pulsatile phenomenon is scarcely new, but it has gained new impetus from three recent developments: the commercial production of reliable blood flowmeters, the formulation of theories appropriate to
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Pulsatile Flow in Microfluidic Systems
Small, 2019AbstractThis review describes the current knowledge and applications of pulsatile flow in microfluidic systems. Elements of fluid dynamics at low Reynolds number are first described in the context of pulsatile flow. Then the practical applications in microfluidic processes are presented: the methods to generate a pulsatile flow, the generation of ...
Brian Dincau +2 more
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Journal of Applied Physiology, 1965
The purpose of this study was to examine critically the theoretical equations derived for pulsatile laminar flow in rigid straight tubes. These equations, presented in their most useful form by J. R. Womersley in 1955, give the fluid flow rate as a function of the pressure gradient-time relationship, pulse frequency, fluid properties, and tube radius,
R G, Linford, N W, Ryan
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The purpose of this study was to examine critically the theoretical equations derived for pulsatile laminar flow in rigid straight tubes. These equations, presented in their most useful form by J. R. Womersley in 1955, give the fluid flow rate as a function of the pressure gradient-time relationship, pulse frequency, fluid properties, and tube radius,
R G, Linford, N W, Ryan
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MR angiography with pulsatile flow
Magnetic Resonance Imaging, 1992To achieve acceptable scan times, current multiple thin slice and 3D MR angiography (MRA) methods usually are based on continuous data acquisition, without ECG-synchronization. The purpose of this work is to study consequences of pulsatile blood flow for the 2D inflow method.
R G, de Graaf, J P, Groen
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Pulsatile and Nonpulsatile Blood Flow
JAMA: The Journal of the American Medical Association, 1965Decreased pulsatile blood flow may occur in certain clinical conditions in which congenital or acquired constriction is present in a major artery. Coarctation of the aorta, renal arterial stenosis, and arteriosclerotic narrowing of visceral and peripheral arteries may produce significant dampening of the pulse wave distal to the site of partial ...
I, MANDELBAUM, W H, BURNS
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Pulsatile pipe flow transition: Flow waveform effects
Physics of Fluids, 2018Although transition is known to exist in various hemodynamic environments, the mechanisms that govern this flow regime and their subsequent effects on biological parameters are not well understood. Previous studies have investigated transition in pulsatile pipe flow using non-physiological sinusoidal waveforms at various Womersley numbers but have ...
Melissa C. Brindise, Pavlos P. Vlachos
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The Bulletin of Mathematical Biophysics, 1972
This paper deals with a mathematical attempt to determine the wall shear during normal flow of blood in the ascending and the descending thoracic aorta. A simple model is used, but the results obtained are in agreement with published experimental results for the descending thoracic aorta.
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This paper deals with a mathematical attempt to determine the wall shear during normal flow of blood in the ascending and the descending thoracic aorta. A simple model is used, but the results obtained are in agreement with published experimental results for the descending thoracic aorta.
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The American Journal of Cardiology, 1965
This volume presents the proceedings of the First International Symposium on Pulsatile Blood Flow, held at the Presbyterian Hospital, Philadelphia, in April, 1963. It reports a multidisciplinary approach to arterial hemodynamics and includes as participants not only physicians, but biophysicists, mathematicians, physiologists and engineers.
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This volume presents the proceedings of the First International Symposium on Pulsatile Blood Flow, held at the Presbyterian Hospital, Philadelphia, in April, 1963. It reports a multidisciplinary approach to arterial hemodynamics and includes as participants not only physicians, but biophysicists, mathematicians, physiologists and engineers.
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Pulsatile Ocular Blood Flow during Pregnancy
European Journal of Ophthalmology, 2002Purpose To study pulsatile ocular blood flow (POBF) throughout pregnancy. Methods We enrolled twenty-seven healthy women in the first trimester of gestation, only ten of which were followed through the second trimester, and fourteen non pregnant healthy women. In each subject we measured POBF with the POBF pneumotonometer (OBF Ltd.
Centofanti, M +7 more
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