Η = (0.76 N/m 2) / (0.5 (1/s)) = 1.52 (N*s) / m 2 = 1.52 Pa*sĢ) What is the pressure necessary to move a plane of fluid with a shear rate of 0.35 s (-1) and a dynamic viscosity of 0.018 Pa*s?Īnswer: From the formula of dynamic viscosity we can find the share stress, Also used in paint, a Stormer viscometer. According to its dynamic viscosity, to which one of these fluids corresponds?Īnswer:First calculate the dynamic viscosity using the formula above, where τ=0.76 N/m 2 and γ=0.5 s (-1). 5 Concluding remarks We have analyzed in this first part the continuous problem associated to a coupling between the steady Navier-Stokes equations and the scalar Energy equation, which comes by taking account the temperature-dependence of the three thermophysical properties: dynamic viscosity, thermal conductivity and density in a generalized Boussinesq model. The efflux time can also be converted to kinematic viscosities (centistokes, cSt) through the conversion equations.
Another method for calculating the viscosity of air at a specified temperature and pressure will also be presented and discussed. It will be discussed and used in example calculations. The below tables provide the dynamic viscosity, the kinematic viscosity and the density of water at different temperatures. In this method a Viscosity Blending Number (VBN) of each component is first calculated and then used to determine the VBN of the liquid mixture as shown below. Water Properties Dynamic Viscosity, Kinematic Viscosity and Density. However, the use of the GK relation to calculate bulk viscosity using DPD has. Dynamic viscosity is the tangential force required to move one horizontal plane of a fluid with respect to another.ĭynamic viscosity = shearing stress / shearing rate changeġ) We have a fluid with a shear rate of 0.5 s (-1) and a shearing stress of 0.76 N/m 2. The Sutherland formula canbe used to calculate the viscosity of a gas at a specified temperature if the Sutherland constant isavailable for the gas. Refutas (2000) proposed a method by which the kinematic viscosity of a mixture of two or more liquids. Dissipative Particle Dynamics (DPD) is a powerful mesoscopic modelling.
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