Non newtonian fluid

• Article • • 16 July 2020 Mapping the local viscosity of non-Newtonian fluids flowing through disordered porous structures • ORCID: orcid.org/0000-0003-2592-3242 • ORCID: orcid.org/0000-0002-3793-1904 • ORCID: orcid.org/0000-0002-0949-9085 • ORCID: orcid.org/0000-0002-2063-6490 • ORCID: orcid.org/0000-0003-1918-8253 • • ORCID: orcid.org/0000-0002-5571-7610 • … • ORCID: orcid.org/0000-0003-2702-8612 Show authors Scientific Reports volume 10, Article number: 11733 ( 2020) Flow of non-Newtonian fluids through topologically complex structures is ubiquitous in most biological, industrial and environmental settings. The interplay between local hydrodynamics and the fluid’s constitutive law determines the distribution of flow paths. Consequently the spatial heterogeneity of the viscous resistance controls mass and solute transport from the micron to the meter scale. Examples range from oil recovery and groundwater engineering to drug delivery, filters and catalysts. Here we present a new methodology to map the spatial variation of the local viscosity of a non-Newtonian fluid flowing through a complex pore geometry. We use high resolution image velocimetry to determine local shear rates. Knowing the local shear rate in combination with a separate measurement of the fluid’s constitutive law allows to quantitatively map the local viscosity at the pore scale. Our experimental results—which closely match with three-dimensional numerical simulations—demonstrate that the exponential de...

Before you select a pump for any service, you need to know and understand the characteristic properties of the fluid you wish to pump. Fluids fall into two classifications—Newtonion or non-Newtonion. Every time I review the characteristics of both fluids, I get caught up in the overwhelming array of nomenclature and technical terms. I call non-Newtonian fluids rascals because they do not follow the rules. I was thinking I might take a simpler approach for the purpose of this column. A major portion of any discussion regarding the subject concerns viscosity, and I suggest you read my article on the subject ( Pumps & Systems, November 2017). For a more in-depth, technical article, see my co-contributor’s article from Pumps & Systems, December 2011, by Dr. Lev Nelik. Viscosity Definition Viscosity is a fluid’s resistance to flow or pour, but not all fluids resist or react in the same way or even in the same time reference. With rare exceptions, the viscosity for every fluid will change indirectly with the temperature; if the temperature of the fluid goes up, the viscosity will decrease and vice versa. One way to visualize viscosity is by watching a metal ball fall through a glass container of the liquid at different speeds for various viscosities. The faster the ball falls, the lower the viscosity of the fluid. To take the viscosity concept another step, it is also that property of a fluid that resists a shearing force. Simply put, it pours either fast or slow. Pouring slow m...

While physicists have understood the gist of how non-Newtonian fluid can change states from a liquid to a solid depending on how you manipulate it, warring parties have been at odds over what's going on at a molecular level - what exactly are those particles doing in there to make a substance so strange? It's been decades, but now a new paper has come out with a potential solution, and it turns out the answer is… everyone's right! But let's back up a bit and run through some of the basics. First off: what exactly is a A Non-Newtonian fluids, on the other hand, follow a different set of rules. You just need to exert some kind of force on it - like a punch - and it'll change its viscosity in such a way that it can shift its states entirely. The key to viscosity is how much friction or resistance a substance has, for example, honey is very viscous, while water is not. "The friction arises because a flowing liquid is essentially a series of layers sliding past one another. The faster one layer slides over another, the more resistance there is, and the slower one layer slides over another, the less resistance there is. Anyone who's ever stuck their arm out of the window of a moving car can attest that there is more air resistance the faster the car is moving (air is technically a fluid)." That's how physicists have explained non-Newtonian fluids in the past, but that's too basic - we need to go deeper, to the molecular level to really understand what's going on. And that's wher...

A dilatant is a This can readily be seen with a mixture of material—this is the reason why when walking on wet sand, a dry area appears directly underfoot. Definitions [ ] There are two types of deviation from Newton's law that are observed in real systems. The most common deviation is shear thinning behavior, where the The parameters that control shear thickening behavior are: particle size and particle size distribution, particle volume fraction, particle shape, particle-particle interaction, continuous phase viscosity, and the type, rate, and time of deformation. In addition to these parameters, all shear thickening fluids are stabilized suspensions and have a volume fraction of solid that is relatively high. Viscosity of a solution as a function of shear rate is given by the η = K γ ˙ n − 1 , where η is the viscosity, K is a material-based constant, and γ̇ is the applied shear rate. Dilatant behavior occurs when n is greater than 1. Below is a table of viscosity values for some common materials. Material Viscosity ( 0.60 0.88 1.06 1–5 1.55 2.24 10 14 27 150–200 2,000–3,000 10,000–25,000 50,000–70,000 150,000–250,000 Stabilized suspensions [ ] A In an unstable suspension, the dispersed, particulate phase will come out of solution in response to forces acting upon the particles, such as gravity or Hamaker attraction. The magnitude of the effect these forces have on pulling the particulate phase out of solution is proportional to the size of the particulates; for a large...

Helmenstine, Anne Marie, Ph.D. "How Oobleck Works." ThoughtCo, Apr. 5, 2023, thoughtco.com/how-oobleck-works-608231. Helmenstine, Anne Marie, Ph.D. (2023, April 5). How Oobleck Works. Retrieved from https://www.thoughtco.com/how-oobleck-works-608231 Helmenstine, Anne Marie, Ph.D. "How Oobleck Works." ThoughtCo. https://www.thoughtco.com/how-oobleck-works-608231 (accessed June 15, 2023).