Mexico border is being used as evidence for the need for a new and improved border wall. NBC 7's Mari Payton has more. Published Friday, March 15, Video courtesy of Twitter user MexicanAndyCx. Knowing such information would provide insights into how the individual parts of the sample respond to various conditions in pipe flow. Understanding the three common flow instabilities — shear banding, wall slip, and plug flow — helps engineers know what to expect from pipe flow and aides in testing ways to prevent or enhance them in processing and application.
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Extended use and development of various particle tracking rheometry methods will produce new correlations between sensory qualities and flow properties for food and consumer products. Wall slip occurs when the sample at the rotating wall of the measuring system does not move at the same velocity as the wall.
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Slippage at the wall may be triggered by various surface chemistries and lubrication forces that reduce the friction between sample and measuring system. A greater effective shear rate results instead of the intended applied shear rate. The most rudimentary manner to visually observe wall slip is to draw a line along the sample loaded in a parallel plate and after applying a strain small deformation see if the line forms a fairly straight line or if it is crooked near either wall.
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Additionally, wall slip can induce layered bands. Shear banding is the occurrence of two or more flowing layers of fluid that maintain different flow velocities despite being under the same applied shear rate Figure 2. The actual shear rate is different for the two layers, typically with a band in the middle not touching the wall and another that is close to the wall.
Shear bands and wall lubrication can be triggered by inter-particle interactions generated by the chemical and physical properties of the specimen. Steric depletion, 4 particle migration, and hydrophobicity are just a few mechanisms that can directly contribute to flow instabilities.
When shear bands persist over time, some bands may slow down to a point where they do not move at all. Plug flow is often evident in dense suspensions and paste-like samples that have flow bands of non-moving fluid among channels of flowing sample. The slip boundary is also the proper boundary condition for symmetry surfaces.
Nagi Elabbasi Veryst Engineering. Hi no-slip is the fact that a fluid velocity tends to "0" at the solid-fluide interface, noslip there is no fluid-surface friction at all.
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Form most fluid problems, at least in laminar no-slip is rather "normal" in turbulent anyhow there are "tricks" being applied in the surface layer regions, but I tend to use no-slip anyhow. A slip conditions is as a symmetry condition check the true equations , the wall has no effect on the fluid velocity in planes parallel and close to the wall You were first this time Nagi ; -- Good luck Ivar. Yes I was … the overall score is definitely in your favor though Ivar ;.
I have my own question. The boundary conditions are ready-made options in fluid flow physics. What about at two liquid interface? I think slip boundary condition should be fine.