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 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

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.

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