![]() In rare cases where the root-mean-square fluctuating velocities are equal, a condition known as isotropic turbulence exists. This flow is usually described in terms of intensity by measuring the fluctuating velocity relative to the mean velocity. The lower the viscosity, the more turbulent and extended the flow. The face of the rotating blade generates significant motion, both axially and radially, typically to distances of two to 10 blade diameters. When a turbine-type mixer creates turbulence in the lower viscosity ranges (less than 5,000 centipoise), the resulting flow is chaotic. To better understand the ramifications of high-viscosity mixing, let’s first review a much simpler case - that of turbulent flow in low-viscosity mixing. Yet, in the case of mixing highly viscous materials, achieving uniformity is often a difficult, but not impossible, challenge. One way to view mixing is as a method to cause separate ingredients otherwise independent from one another to interface as a result of an external force. Let our team help you make the right pump decisions and get the most out of your pump system.Publications Understanding High Viscosity Mixing Choosing a pump designed to handle the specific viscosity range of your process fluid(s) can make a significant difference.įor help with pump selection and custom configuration based on your specific pumping application and process fluids or materials, contact DXP Pacific today. Pump manufacturers and distributors can provide product specs relating to a pump’s viscosity capabilities. You can research known viscosities of most common fluids, which are normally listed in units of SSU (Saybolt Seconds Universal) or CST (centistokes). Selecting the right pump equipment and configuring your system will require careful planning. This will decrease friction and prevent drag loss. You will also want to consider making the pipework size larger throughout the system. It is very important to make sure there are no restrictions on the suction side. ![]() In addition to pump selection, fluid viscosity can also help determine pump system configuration and operating practices. They can effectively handle fluids with both low and high viscosities and can run dry without the risk of major pump failure. Peristaltic pumps are another popular pump option, especially in applications with variances in viscosity. If variables like temperature cause the fluid to increase or decrease in viscosity, you could start to experience performance issues. The optimized performance can be achieved by keeping higher-viscosity fluids running through the pump system at consistent temperatures. Positive displacement pumps are able to operate at lower speeds and offer variable flow rates, which is great for fluids with thicker viscosities. Examples include vane pumps, hose pumps, diaphragm pumps, gear pumps, and screw pumps. There are a number of different types of positive displacement pumps suited for various fluids, viscosities, and specialty applications. Positive displacement pumps are commonly used for more viscous fluid applications. High-viscosity liquids can dramatically affect centrifugal pump performance, energy efficiency, and flow rates. Positive Displacement PumpsĪs viscosity thickens, there will usually be an increased amount of power drawn to move the fluid through the pump system. Centrifugal pumps are often a standard choice for these less-challenging processing applications. Pump selection is typically not as difficult when dealing with low-viscosity fluids. When it comes to pump selection, fluid viscosity is one of several key factors along with other application-specific criteria for your operation’s ideal pump system. Temperature can also affect fluid viscosity, as higher heat tends to lower the viscosity of pumped fluids. High-viscosity fluids like syrups and many oils move slower, with the fluid maintaining more consistent integrity. Low-viscosity fluids like water or most beverages will generally move through a pump system rather easily with low resistance. ![]() Fluid viscosity is one of the most important factors to consider when selecting pumps and configuring a system for optimized performance. ![]() From clean water to thick slurries and everything in between, every type of liquid will flow through its respective pump system differently. There are many different types of fluids being pumped throughout the world every single day.
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