1/6/2023 0 Comments Viscosity of glycerolThen Finally i am told to plot a velocity over r 2 graph, and then to determine the viscosity of glycerol(η) from the equation desribed above. I am not told what unit i am attempting to measure, I was simple given an experiment sheet with the Aim to:-ĭetermine the coefficent of viscosity of glycerol. This brings me to belive the higher mass caused a slower acceleration not allowing them to reach terminal velocity in 20cm thus distorting the results? The tube was around 3inches wide so i don't think it would be that? The length of the tube was only 20cm. In the lower ranges 4-8mm the results are all quite constant(around 1.4) but at 10mm+ the results begin ro rise incrimentally(10mm=1.7,12mm=1.8,14mm=2.2). I tested ball bearings ranging from 4mm-14mm. The tube was much larger than the balls in diameter so i don't think the walls would have affected the results as drastically as this. I think the problem was with the length of my tube, and the heavier balls where not reaching terminal velocity. On another note, what were the units of the viscosities you calculated. If the ball diameter is on the same order as the cylinder diameter, the relationship you used will not be as accurate.) Did you wait for the balls to reach terminal velocity before you measured the velocity? How did the diameters of the balls compare with the diameter of the cylinder? (The equation you used applies to the balls falling through an infinite ocean of the fluid. The viscosity is a property of the liquid, and is independent of the objects that are used. Here is one of my test, does the final number represent the viscosity coeffient of the fluid or does it represent the resistance the object feels? or does it represent nothing? :P This is not a physics course and I do not study physics so if u can try to keep it simple it would be nice :) #Viscosity of glycerol how to#If this is the case how to can i make the connection between this ristance and the coeffient viscosity of the fluid? EXPERIMENTAL INVESTIGATION ON HIGH-PRESSURE, HIGH- TEMPERATURE VISCOSITY OF GAS MIXTURES. This is because the number I am receiving from the sum is raising in line with the radius of the sphere. I have crunched some number but I think they represent the reistants the sphere feels in the fluid, not the actual viscosity of the fluid. O = the density of the glycerol(given to me as 1260kg/m 3 New measurements with parallel disks separated by a narrow gap indicate that the viscosity of 60 wt % glycerin in water is constant up to 90 000 s-1.I have been given an experiment to perform, whereby I drop steel ball bearings into a glass measuring cylinder, and time how long it takes for the ball bearing to fall a set distance.įrom this I should be able to work out the viscosity coeffienct of the glycerol. One of these, viscous dissipation, qualitatively explains the progressive fall in the viscosity of glycerin-water as the shear rate is ramped-up beyond 60 000 s-1 to 90 000 s-1. Two alternative interpretations, both of which invoke experimental artifacts, have now been explored. New measurements with parallel disks separated by a narrow gap indicate that the viscosity of 60 wt % glycerin in water is constant up to 90 000 s-1.ĪB - The sole report of glycerin-water viscosities at high shear rates, by Ram, has so far been interpreted as evidence of shear thinning. Glycerol or glycerin is a colourless, odourless, viscous liquid that is. One of these, viscous dissipation, qualitatively explains the progressive fall in the viscosity of glycerin-water as the shear rate is ramped-up beyond 60 000 s-1 to 90 000 s-1. Life Vegetable Glycerin Liquid Oil - Sustainable Food Grade Vegetable Glycerine. The viscosity of 99 glycerol at 0 is about 9420 cp, while that of 235 CP at 40 is about 235 CP. Glycerol viscosity varies in a wide range. The viscosity of glycerol increases with the increase of glycerol content and with the decrease of temperature. N2 - The sole report of glycerin-water viscosities at high shear rates, by Ram, has so far been interpreted as evidence of shear thinning. The viscosity of 99 glycerol is about 775 CP at 20. T1 - Does the viscosity of glycerin fall at high shear rates?
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