![]() This simple definition can be confusing when we start looking at fluids with different densities or measuring viscosity. To break viscosity down into simple examples think of water (a low viscosity fluid) and honey (a high viscosity fluid). "Dynamic Viscosities of (Methyl Acetate or Methanol) with (Ethanol, 1-Propanol, 2-Propanol, 1-Butanol, and 2-Butanol) at 298.15 K"įood Processing Technology: Principles and Practice (3rd ed. Viscosity is defined as 'resistance to flow' and is often referred to as the 'thickness' of a fluid. Based on the measured values, the Arrhenius. represents dynamic viscosity and is the fluids density. The formula to calculate the kinematic viscosity is. The unit of measurement for kinematic viscosity is the Stokes (St), with 1 St 1 cm²/s. The rheological properties of ketchup as a function of different hydrocolloids and temperature The following rheological properties were described: dependence of viscosity on a sample temperature, dependence of shear stress on shear rate. Kinematic Viscosity is represented with the Greek letter (nu). The Viscosities of Iodine Pentafluoride and Ditellurium Decafluoride Industrial & EngineeringĮffect of moisture content on the viscosity of honey at different temperatures The kinematic viscosity of a liquid can be looked upon as the liquid's resistance to flow under its own gravity head. The centistoke (one hundredth of a stoke) is more generally used. "Viscosity of Glycerol and Its Aqueous Solutions". In the metric system, the unit of kinematic viscosity is the square centimeter per second or the stoke. Journal of Chemical & Engineering Data. 40 (1): 136–140.įood Processing Technology: Principles and Practice (3rd ed.) In engineering, centistokes (cSt) are usually used. A human is roughly 1.8 m tall, so lets use that for the length. At comfortable swimming temperatures, the kinematic viscosity of honey is 73.6 cSt. We would like to model this by maintaining a constant Reynolds number. 4.3 Refractive index The refractive index of a fluid is linked to its density, thus the correlations also use a first order for temperature and a second order for concentration, with a cross term. However, the commonly used measure is the stokes (or stoke) where 1 St 10 m²/s. You are curious to know what it would be like to swim through a pool of honey. The dynamic viscosity can then be computed as the product of the density and kinematic viscosity. At 25 C (77 F), honey with 14 water content generally has a viscosity around 400 poise, while a honey containing 20 water has a viscosity around 20 poise. Kinematic viscosity can be obtained by dividing the absolute viscosity of a fluid with its mass density. Aside from water content, the composition of most types of honey also has little effect on viscosity. "Viscosity and Density of Binary Liquid Mixtures of Hydrocarbons, Esters, Ketones, and Normal Chloroalkanes". Above its melting point, however, water has little effect on viscosity. Densities and viscosities of binary mixtures of 1-propanol and 2-propanol with acetonitrileĬRC Handbook of Chemistry and Physics, 99th Edition
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