scholarly journals Repair of gastrocutaneous fistula utilizing thickened fluids: application of Poiseuille’s Law to fistula healing

2018 ◽  
Vol 2018 (7) ◽  
Author(s):  
Simon P Batterham
Keyword(s):  
Poiseuille's Law ◽  
Fistula Healing ◽  
Gastrocutaneous Fistula ◽  
Poiseuille’S Law

scholarly journals Poiseuille’s law in polyuria

2014 ◽  
Vol 29 (7) ◽  
pp. 1289-1289 ◽  
Author(s):  
Michiel F. Schreuder ◽  
Linda Koster-Kamphuis
Keyword(s):  
Poiseuille's Law ◽  
Poiseuille’S Law

Flow in xylem vessels and Poiseuille's law

1978 ◽  
Vol 56 (3) ◽  
pp. 333-338 ◽  
Author(s):  
R. Giordano ◽  
A. Salleo ◽  
S. Salleo ◽  
F. Wanderlingh
Keyword(s):  
Water Flow ◽  
Total Flux ◽  
Sechium Edule ◽  
Poiseuille's Law ◽  
Measured Water ◽  
Poiseuille’S Law

We measured water flow in simple xylem vessels of Sechium edule at various pressures. We found a disagreement with Poiseuille's law, which changes from vessel to vessel and becomes abruptly pronounced in some cases. We discuss our data in terms of an 'impediment coefficient,' K. It can be shown that the total flux in a stem, calculated as the sum of the flux in single vessels, agrees quite well with the data reported in literature.

scholarly journals THE SIZE OF PORES IN COLLODION MEMBRANES

1926 ◽  
Vol 9 (6) ◽  
pp. 755-762 ◽  
Author(s):  
David I. Hitchcock
Keyword(s):  
Pore Size ◽  
Microscopic Examination ◽  
Dark Field ◽  
Dark Field Illumination ◽  
Poiseuille's Law ◽  
Poiseuille’S Law

By the application of Poiseuille's law to the rate of flow of water through collodion membranes, it is calculated that the membranes used had pore radii of the order of 0.3 to 2 x 10–6 cm. On the same basis the number of pores per sq. cm. appears to vary from 270 x 1010 to 7 x 1010, decreasing with increase in pore size. Reasons are given for preferring these figures for the radii to figures, 100 times as large, which were calculated by others. Microscopic examination of the membranes, with dark-field illumination, indicates that they are made up of solid granules or filaments of collodion much less than 1 x 10–4 cm. in thickness.

scholarly journals The Importance of Velocity Acceleration to Flow-Mediated Dilation

2012 ◽  
Vol 2012 ◽  
pp. 1-11 ◽  
Author(s):  
Lee Stoner ◽  
Joanna M. Young ◽  
Simon Fryer ◽  
Manning J. Sabatier
Keyword(s):  
Blood Flow ◽  
Shear Stress ◽  
Vascular Tone ◽  
Cardiac Cycle ◽  
Blood Velocity ◽  
Rate Of Change ◽  
Flow Mediated Dilation ◽  
Flow Pulsatility ◽  
Poiseuille's Law ◽  
Poiseuille’S Law

The validity of the flow-mediated dilation test has been questioned due to the lack of normalization to the primary stimulus, shear stress. Shear stress can be calculated using Poiseuille's law. However, little attention has been given to the most appropriate blood velocity parameter(s) for calculating shear stress. The pulsatile nature of blood flow exposes the endothelial cells to two distinct shear stimuli during the cardiac cycle: a large rate of change in shear at the onset of flow (velocity acceleration), followed by a steady component. The parameter typically entered into the Poiseuille's law equation to determine shear stress is time-averaged blood velocity, with no regard for flow pulsatility. This paper will discuss (1) the limitations of using Posieuille's law to estimate shear stress and (2) the importance of the velocity profile—with emphasis on velocity acceleration—to endothelial function and vascular tone.

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