Viscosity is also very temperature dependent. The pascal second is the SI unit for viscosity. It is given as the velocity of the moving surface divided by l (the original length of the material). Strain rate is the rate of change of deformation or strain in a material. It is defined as the force tangent to the material surface divided by the area in which it acts. Shear stress is the the friction between fluid particles sliding past each other. Viscosity is denoted by η (eta) as the ratio of the shear stress (Force/Area) to the strain rate. Viscous forces oppose the motion of one portion of the fluid relative to another. Viscosity is internal friction inside a fluid. Is it close to the value you found experimentally? Alternatively use the viscosity of glycerin to calculate the terminal velocity.Also, compare it to the given values in the table below. Using the times recorded in glycerin find the terminal velocity and use that in stokes equation to find the viscosity of glycerin.Ask students why Stoke s Law will not work for water in this case.switch off the stopwatch when the ball passes the second ring.
Start the stopwatch when the ball passes the first ring (this time will be used to calculate the terminal velocity of the ball).Both tubes have two dark rings a meter apart. Two long tubes are filled with fluids of different viscosities, one with water and the other with glycerin. Results show the effectiveness of the model and the ability to predict viscosity accurately in low to medium shear rates, while in high shear rate, a slight deviation was noticeable.Finding viscosity of a liquid by measuring velocity of small balls sinking in the tall tubes, and applying Stoke’s equation. A polymer rheology study was carried out on SAV10 at various concentrations (750-5000 ppm) and brine salinities (43-210 k ppm). The research then discusses a novel modification of the power law model to predict HPAM (SAV10) viscosity in a wide range of shear rates based on polymer concentration, fluid salinity, and divalent content. This research initially reviews different types of polymers that can be applied successfully in EOR, demonstrate conditions that can alter polymer viscosity in porous medium, and analyze models that predict polymer bulk and in situ viscosity. Previous model has proven a link between polymer viscosity and zero shear rate viscosity, relaxation time, hardness, and many other factors. Predicting viscosity has been established by numerous researchers as an essential tool to study polymers behavior under varying conditions. With high success rates and efficiency, polymer flooding operates by increasing the viscosity of water, promoting greater sweep efficiency and resulting in higher oil recovery beyond conventional waterflooding. Abstract : Polymer flooding has been established as an effective enhanced oil recovery (EOR) technique and can be utilized in large-scale field expansions.
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