STRUCTURAL VISCOSITY IN SOME LYOPHILIC SOLS: I. THE FLOCCULATION OF GELATIN AND CASEIN BY AGAR

1932 ◽  
Vol 7 (6) ◽  
pp. 662-670
Author(s):  
Wilfred Gallay
Keyword(s):  
Parabolic Equation ◽  
High Pressures ◽  
Relative Viscosity ◽  
Structural Viscosity ◽  
Similar Series ◽  
Poiseuille's Law ◽  
Minimum Viscosity ◽  
Structural Turbulence ◽  
Poiseuille’S Law

The relative viscosities of mixtures of gelatin and agar sols were measured at varying pressures using the overflow viscosimeter. All the sols showed wide deviations from Poiseuille's law, with regions of structure and turbulence at low and high pressures, respectively. A minimum viscosity was found for a intermediate mixture, showing a dehydrating action of the agar on the gelatin. This effect was masked in a similar series using casein and agar, due to the much greater difference in relative viscosity of the two sols. A marked structural turbulence was found in the region of structure in many cases. The relation between velocity of flow and pressure is expressed by a parabolic equation.

STRUCTURAL VISCOSITY IN SOME LYOPHILIC SOLS: II. RUBBER SOLS

1932 ◽  
Vol 7 (6) ◽  
pp. 671-676
Author(s):  
Wilfred Gallay
Keyword(s):  
Molecular Weight ◽  
Ultra Violet ◽  
Structural Viscosity ◽  
Ultra Violet Light ◽  
Violet Light ◽  
Poiseuille's Law ◽  
Poiseuille’S Law

The relative viscosities of sols of natural and purified rubber in benzene were measured at varying pressures using the overflow viscosimeter. Deviations from Poiseuille's law to varying extents were found in all cases, with regions of structure and turbulence at various pressures. The limiting concentrations above which structure is evident and Poiseuille's law is not obeyed were found to be in agreement with those calculated by Staudinger, on the basis of his theory of the relation between the viscosity and molecular weight of polymeric molecules. Exposure to ultra-violet light was found to decrease considerably the viscosity of a sol of purified rubber.

Structural Viscosity in Some Lyophilic Sols. II. Rubber Sols

1933 ◽  
Vol 6 (3) ◽  
pp. 371-375 ◽  
Author(s):  
Wilfred Gallay
Keyword(s):  
Molecular Weight ◽  
Ultra Violet ◽  
Structural Viscosity ◽  
Ultra Violet Light ◽  
Violet Light ◽  
Poiseuille's Law ◽  
Poiseuille’S Law

Abstract The relative viscosities of sols of natural and purified rubber in benzene were measured at varying pressures, using the overflow viscosimeter. Deviations from Poiseuille's law to varying extents were found in all cases, with regions of structure and turbulence at various pressures. The limiting concentrations above which structure is evident and Poiseuille's law is not obeyed were found to be in agreement with those calculated by Staudinger on the basis of his theory of the relation between the viscosity and molecular weight of polymeric molecules. Exposure to ultra-violet light was found to decrease considerably the viscosity of a sol of purified rubber.

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.

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