![]() Temperature, however, has the greatest impact on viscosity. Sugar, for example, makes water more viscous. Adding molecules can have a significant effect. Pressure has a small effect on liquids and is often ignored. Examples include temperature, pressure, and the addition of other molecules. ![]() A fluid with a low viscosity is said to be “thin,” while a high viscosity fluid is said to be “thick.” It is easier to move through a low-viscosity fluid (like water) than a high-viscosity fluid (like honey). When we fill the same cup with water, for example, the water will drain much more quickly. This is because honey’s viscosity is relatively high when compared to other liquids. I notice that the cup drains very slowly when we pour honey into it. Consider a cup made of styrofoam with a hole at the bottom. The best way to visualize this is through an example. Just like in the case of friction between moving solids, viscosity will determine the energy required to make a fluid flow. This can also be considered to be friction between the molecules. On a molecular level, viscosity is caused by the interactions between different molecules in a fluid. Fluids with low viscosity flow easily because their molecular makeup creates little friction when they are in motion. Viscous fluids resist motion because their molecular makeup creates a lot of internal friction. We have distributors worldwide to ensure we can supply across the world.A fluid’s viscosity is a measure of its resistance to flow. It describes the internal friction of a moving fluid. A pump-feeder would typically use a single screw or twin screws or maybe even more screws depending on the duty.Ĭall Kecol Pumping Systems for advice and help. If you’re working with solid blocks of butter or non-flowing paste, you need a pump-feeder to positively push the product to the pump inlet. Our Power Prime, Maxim Prime and Mega-Prime pumps are built to suit the application Pump Feeders for high viscosity material and solid blocks For very high viscosity, non-flowing media, the pump can be mounted on a priming plate that pushes down into the drum or IBC and primes the pump as the assembly moves down into the container. This can be done with the help of a suction lance or hose. In some scenarios, you may need the pump to suck (self-prime) from an open-top drum or IBC. Viscous Pumps to ‘lift’ high viscosity fluids This can be essential in a closed tank where the fluid viscosity is high enough that the ‘fluid’ doesn’t actually flow. If the tank can be pressurised (usually with compressed air or Nitrogen), this positive pressure will assist natural gravity to push the high viscosity fluid towards the tank outlet and into the pump inlet. Ideally, you should connect the pump inlet directly to the tank outlet. ![]() If you’re relying on gravity to feed the pump inlet from the bottom outlet of a large tank or vessel, make sure there is a minimal length of big bore pipework between the pump inlet and the supply of product. Provide a positive feed to the pump inlet ![]() Maxiprime Pumps for Pastes that do not flow Keep the discharge distance to a minimum.Īs we said above, size matters, so where discharge pipework bore size needs to be as large as possible, discharge pipework length needs to be as short as possible! To keep friction losses as low as possible, make the discharge pipework run as short as possible and have as few bends as possible. Bottom line – use as fat a pipe as possible and keep the pressure down! The friction loss difference between 2-inch and 4-inch can be massive and make or break a high viscosity pump project. The bigger the internal bore of your discharge pipework, the lower the resistance caused by friction losses. Size matters! Use large bore discharge pipe or hose. Using a pump with a large inlet and large internal cavities makes things easier by reducing resistance and overcoming bottlenecks…passing a camel through the eye of the needle is not easy! Running at low speeds not only protects shear-sensitive fluids or entrained sensitive solid particles but it also helps the pump to grab hold of the liquid and pump continuously without cavitating. Where a centrifugal pump is good on water or juice, it will not pump caramel or tomato paste! Kecol’s Viscous Pumps use Piston pumps for most of our high viscosity pump duties as they offer a partial vacuum to help suck the product into the pump, we can also use other pump types such as rotary lobe, twin-screw, progressive cavity or other pumps from our portfolio. You’re going to need a viscous pump that can handle the higher pressures required to move heavy, viscous fluids. For high viscosity fluids you will need a really strong and powerful Viscous Pump. ![]()
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