![]() ![]() One figure showing relative viscosity with variations in pressure and temperature is also included.Ĭentipoise, gram/(centimetre second) = poise, kilogram/metre second =newton second/square metre = pascal second, pound/(foot hour) , pound/(foot second), reyn The figures and tables below shows how water viscosity changes with temperature (☌ and ☏) at water saturation pressure (which for practicle use, gives the same result as atmospheric pressure at temperatures < 100 ☌ (212☏)). See also dynamic and kinematic viscosity of air, ammonia, benzene, butane, carbon dioxide, ethane, ethanol, ethylene, methane, methanol, nitrogen, oxygen and propane. See also other properties of Water at varying temperature and pressure: Boiling points at high pressure, Boiling points at vacuum pressure, Density and specific weight, Enthalpy and entropy, Heat of vaporization, Ionization Constant, pK w, of normal and heavy water, Melting points at high pressure, Prandtl number, Properties at Gas-Liquid Equilibrium Conditions, Saturation pressure, Specific gravity, Specific heat (heat capacity), Specific volume, Thermal conductivity, Thermal diffusivity and Vapour pressure at gas-liquid equilibrium. See Water and Heavy Water - thermodynamic properties. Temperature Choose the actual unit of temperature: Note! Temperature must be within the ranges 0-370 ☌, 32-700 ☏, 273-645 K and 492-1160 °R to get valid values. While the kinematic viscosity is given as cSt, m 2/s, and ft 2/s The output dynamic viscosity is given as cP, mPa*s, Pa*s, N*s/m 2,lb f*s/ft 2 and lb m/(ft*h), The calculator below can be used to calculate the liquid water dynamic or kinematic viscosity at given temperatures. Absolute or dynamic viscosity is used to calculate Reynold's Number to determine if a fluid flow is laminar, transient or turbulent. At EAG Laboratories, many of our viscometers offer select or programmed temperature control, which affords viscosity testing at constant specified temperatures.The viscosity of a fluid is a measure of its resistance to gradual deformation by shear stress or tensile stress.įor further definitions, go to Absolute (dynamic) and kinematic viscosity. The more elevated the temperature, the more readily the material flows, which results in a lower measured viscosity compared to ambient or sub-ambient conditions. With all viscosity techniques, temperature can greatly impact the results of testing. Common test methods for kinematic viscosity include ASTM D4212, ASTM D1200 and ASTM D445. Intrinsic viscosity is normally performed using the Ubbelohde viscometer.ĭepending on the equipment used, kinematic viscosity can be reported in units of meters squared per second, stokes, centistokes or time in seconds. Intrinsic viscosity is an important technique for characterizing polymers in dilute solution, because it provides information related to molecular weight and the conformational shape of a specific polymer in a chosen solvent. Therefore, the typical applications for capillary viscometers include: dilute polymer solutions, certain types of solvents, dilute solutions, syrups and oils. ![]() The capillary geometry is too small for highly viscous samples. The Ubbelohde and Cannon-Fenske viscometers utilize a glass capillary through which the fluid flows under gravity. The cup-type viscometers are typically used for paints, inks, varnishes and highly viscous coatings. Common ASTM test methods for dynamic viscosity include ASTM D4287, ASTM D562 and ASTM D2196.ĮAG Laboratories performs kinematic viscosity measurements using the following viscometers: Depending on the equipment used, viscosity data can be reported in units of centipoise, poise, Pascal-seconds or Krebs units. The instruments contain a calibrated spring that measures the fluid’s resistance to the movement. Rotational viscometers of various torque ranges manufactured by Brookfield Engineering Corp.įor all of these instrument types, a cone, spindle or paddle is placed in contact with the test fluid and is rotated at a programmed shear rate.Krebs spindle viscometer (KU meter) for paints, pigmented coatings, pastes and adhesives.High shear rate viscometer for paints and pigmented coatings, also known as an ICI viscometer. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |