ViscosityRapidCommunication - Investigations of a New...

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Investigations of a New Proposed Model of Wall Effects on Fluid Viscosity Asher Dunn 1,3 , Adela Kuzmiakova 2 , Minglian Pan 3 , Norris Xu 3 , Jiecheng Zhang 1 1 School of Applied and Engineering Physics, College of Engineering, Cornell University, Ithaca, NY 14853 2 School of Civil and Environmental Engineering, College of Engineering, Cornell University, Ithaca, NY 14853 3 Department of Computer Science, College of Engineering, Cornell University, Ithaca, NY 14853 We measured the variation in the apparent viscosity of glycerin as a function of r/ R. Using a cylindrical falling-sphere viscometer equipped with infra-red timers, we measured the velocities of glass and metal balls of varying diameters and calculated the apparent fluid viscosities. We then compared data with Dinsdale and Moore’s accepted model and Schottenheimer’s new proposed model to account for wall effects. Schottenheimer’s model with optimized K-value fit our data most closely. Our K value of 3.65 was close to Schottenheimer’s proposed value of 3.8. Our results can be used for extending measurements over a larger range of materials and physical dimensions. Viscosity is a fundamental parameter pertaining to a wide spectrum of flows, and its capillary flow characteristics can be obtained via “falling sphere” experiments. Yet, this technique presents a problem: the wall effect introduced by a finite container. To account for this wall
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ViscosityRapidCommunication - Investigations of a New...

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