These include water, alcohol and mineral oil - no matter how much you agitate them they will not become thicker or thinner! Newtonian fluids remains at a constant viscosity no matter the amount of shear applied at a constant temperature. Now for some science!Īll liquids can be categorised into either Newtonian or non-Newtonian. Therefore the temperature you are pumping the fluid at will often also be requested.
If you heat it up it becomes a liquid and easy to pour. At temperatures of 5☌ butter is solid, and sometimes difficult to spread! Whereas, if you leave it at room temperature it becomes more malleable. The hotter a fluid is, the thinner it becomes and therefore less viscous. Some fluids have viscosities that are susceptible to change depending upon the temperature they are being pumped at. So now you’ve told us the viscosity of the fluid we’re ready to spec? Wrong again. The higher the viscosity, the thicker the product, the more difficult it can be to pump and therefore a higher viscosity pump would be required. With other fluids such as oil, varnish, yoghurt or honey it can significantly affect which pump we choose. In order to specify a pump that meets your requirements, one of the vital questions we ask is "can you confirm the viscosity?" With fluids such as water, alcohol or even milk as because of their low viscosities, these fluids show little resistance to flow. For example, Motor Oil SAE 10 has a viscosity of only 50cP but Motor Oil SAE 40 has a viscosity of 540 cP – much, much thicker! If a customer was to request a pump for motor oil, we would always ask what grade this was, just to ensure the pump would be capable of transferring it. If we don’t know exactly what oil and viscosity the oil has, you may find you have a fluid that doesn't pump how it should, or even pump at all. There are so many different types of oils, with viscosities varying anywhere from 12 cPs to 1600 cPs. We just need to know the fluid to specify a pump for your application, right? Wrong. Let’s say you’re looking for a pump for oil and that’s what you tell us. In this instance you’re never going to confuse the two, but when products have a generic term it’s not quite so simple! Oil is oil, right? When you compare it to toothpaste, water is thinner and will flow a lot quicker, a lot easier. To give you an example that you’ll be able to picture easily - water has a viscosity of 1 cP at 20☌, whereas toothpaste is 100,000 cP. Viscosity is typically measured in Centipoise (cP) or Centistokes (cSt). What is viscosity? Put in the most simple of terms, it is the thickness of a fluid and its ability to flow. Specific isobar heat capacity cp steam, specific isochor heat capacity cv steam, adiabatic exponent or isentropic exponent kappa steam, thermic conductivity steam, speed of sound steam.Why Viscosity is Critical to Pump Selection Specific isobar heat capacity cp water, specific isochor heat capacity cv water, thermic conductivity water, speed of sound water.ĭensity steam, dynamic viscosity steam, kinematic viscosity steam, specific inner energy steam, specific enthalpy steam, specific entropy steam, The following thermodynamic properties are calculated:ĭensity water, dynamic viscosity water, kinematic viscosity water, specific inner energy water, specific enthalpy water, specific entropy water, Online calculation of properties of water and steamĮmail: scientific and engineering data onlineĬalculation of thermodynamic properties of water Pressure:Ĭalculation of thermodynamic properties of overheated steamĬalculation of thermodynamic properties of saturated steam Pressure: