Thus, thermal motion in liquids can be decomposed into elementary rigidity while a liquid yields to macroscopic viscous flow in response to the application of an applied shearing force is accepted by many as the mechanical distinction between the two.
42.
Glasses containing both boron and phosphorus ( borophosphosilicate glass, BPSG ) undergo viscous flow at lower temperatures; around 850 �C is achievable with glasses containing around 5 weight % of both constituents, but stability in air can be difficult to achieve.
43.
The viscous flow in amorphous materials is characterized by a deviation from the Arrhenius-type behavior : changes from a high value at low temperatures ( in the glassy state ) to a low value at high temperatures ( in the liquid state ).
44.
Lobate convex features on the surface known as "'viscous flow features "'and "'lobate debris aprons "', which show the characteristics of non-Newtonian flow, are now almost unanimously regarded as true glaciers.
45.
Viscous flow near grain boundaries, for example, can give rise to internal slip in the direction of any lattice plane containing the dislocation, while the principal driving force for " dislocation climb " is the movement or diffusion of vacancies through a crystal lattice.
46.
Inviscid flow was further analyzed by various mathematicians ( Leonhard Euler, Jean le Rond d'Alembert, Joseph Louis Lagrange, Pierre-Simon Laplace, Sim�on Denis Poisson ) and viscous flow was explored by a multitude of engineers including Jean L�onard Marie Poiseuille and Gotthilf Hagen.
47.
I suspect there will also be problems with moving fluids, such as in viscous flow, or in boundary layers, but I don't recall any examples, though we know, for example, that Bernoulli's equation doesn't work for some non-ideal fluids.
48.
The Doremus criterion of fragility can be expressed in terms of thermodynamic parameters of the defects mediating viscous flow in the oxide melts : R D = 1 + H d / H m, where H d is the enthalpy of formation and H m is the enthalpy of motion of such defects.
49.
:A model proposed by Schmincke et al . ( 1967 ) and later supported by Chapin et al . ( 1979 ), based on observations on the Wall Mountain Tuff, suggests that the rheomorphic structures such as a pervasive pyroclasts were formed during laminar viscous flow as the density current comes to a halt.
50.
While the no-slip condition is used almost universally in modeling of viscous flows, it is sometimes neglected in favor of the'no-penetration condition'( where the fluid velocity normal to the wall is set to the wall velocity in this direction, but the fluid velocity parallel to the wall is unrestricted ) in elementary analyses of inviscid flow, where the effect of boundary layers is neglected.
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