Title: Dynamic Friction Coefficient Measurement of Granular Fertilizer Particles
Abstract: Theoretically, in the absence of friction, when a particle is sliding along a straightradial vane, mounted on a flat disc which is spinning at a constant rotational velocity, its radialand tangential velocity are equal at any point along the vane. In reality, there are manydisturbances such as drop mechanics, mechanical (Coulomb) friction, aerodynamic effects,particle bouncing effects against the vane and other particles etc. These factors are usuallylumped together and termed the 'friction coefficient'. The combination of the disturbancescauses a difference between the theoretical and measured radial discharge velocity. Thisdifference allows determining the friction coefficient.<br><br>The governing differential equation for sliding particle motion with friction along a straightradial vane was reduced and a method of determining the friction coefficient based solely on themeasured radial discharge velocity was derived. Since the theoretical radial discharge velocityis equal to the tangential velocity of the particle, it was obtained from the rotational velocitytimes the radius of the disc. The radial discharge velocity of the particles was measured usingan optical sensor developed in earlier research at a distance of 0.4m from the disc. Acommercial spreader fitted with a flat disc and straight radial vanes was used for experiments.<br><br>The results for Urea fertilizer showed a near-Gaussian distribution of the frictioncoefficients, with a mean value of 0.36 and a standard deviation of 0.1 among 812measurements. In addition, an inversely proportional relationship was found between the frictioncoefficients and the particle diameters.
Publication Year: 2006
Publication Date: 2006-01-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 3
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