Newtonian and Non-Newtonian Fluids | Pumps & Systems
2011年12月17日 · However for some fluids (non-Newtonian), viscosity does change—either up or down, as shown in Figure 1. These fluids are dilatent or thixotropic. This has an effect on the power required and also may cause fluid degradation, in addition to having an effect (and usually does) on power. Power is force times speed. Force is stress times area.
Newtonian vs. Non-Newtonian Fluids - Pumps & Systems
2018年5月23日 · A non-Newtonion fluid has a viscosity that varies with the shear stress and shear rate, so it becomes harder to predict the fluid behavior when it is pumped. Examples are latex paints, soaps, tars, glues, most slurries, colloids, polymers and peanut butter.
Non-Newtonian Fluids Require Specialized Planning for Variable ...
2015年2月3日 · Knowing a fluid’s viscosity is essential to properly sizing piping and pumps. The viscosity of all fluids changes with temperature—the higher the temperature, the lower the viscosity. For Newtonian fluids, only temperature changes viscosity. However, non-Newtonian fluids’ viscosities also change for other reasons. Understanding these reasons is critical to …
The Fundamentals of Unfamiliar Fluids | Pumps & Systems
2021年10月11日 · For example, a non-Newtonian fluid flowing through a pipe may have a low viscosity, akin to water. As the flow rate increases, the velocity of the fluid in the pipe increases. In turn, the fluid viscosity may decrease because of the velocity increase. Viscosity can change at different velocities because, by definition of a non-Newtonian fluid ...
Using Centrifugal Pump Technology in Complex Fluids
2011年12月17日 · In Figure 1, a non-Newtonian fluid may further show an increasing apparent viscosity, so-called shear thickening behavior. The equivalent for a decreasing apparent viscosity is known as shear thinning. Finally, the yield stress is some very specific behavior for some non-Newtonian fluids.
Fluid viscosity is related to the shear stress vs. shear rate curve shown above. Each plant’s sludge, which is a non-Newtonian fluid (water is Newtonian), is going to have a unique curve. Of particular importance is obtaining enough data to construct an accurate curve. Data on the left side of the curve is important
Pump Sealing Issues with Viscous Fluids & How ... - Pumps
2016年7月28日 · The viscosity of these fluids is independent of the rate of shear. A non-Newtonian fluid will change viscosity to match alterations in the rate of shear being applied to the fluid and/or the length of time at shear. Several types of non-Newtonian fluids are defined in Figures 2 through 6.
Viscosity’s Effects, Reducing Extraneous Noise & Monitoring …
2014年10月27日 · When the apparent viscosity of a non-Newtonian fluid can be determined, these generalities can be applied. Because the exact relationship between viscosity and pump ratings depends on the pump design and on application conditions, the pump manufacturer’s published data for each pump should be consulted.
Proactively Seeking Viscosity Correction | Pumps & Systems
2018年4月30日 · When pumping non-Newtonian fluids, such as nondrip paint or toothpaste, the viscosity changes during the process. This change can cause fluid resistance leading to underperformance or cavitation, which can ruin the material and pump equipment. But viscous fluids are not going away anytime soon.
Hydraulic Institute Pump FAQs February 2010 | Pumps & Systems
2010年1月26日 · When the apparent viscosity of a non-Newtonian fluid can be determined, then these generalities can be applied. Because the exact relationship between viscosity and pump ratings depends on the pump design and on the application conditions, refer to the pump manufacturer's published data for a particular pump, or consult the manufacturer when ...