By Daniel D. Joseph (auth.), Harold Ramkissoon (eds.)
The major target of the 1st overseas Symposium on Lubricated delivery of Viscous fabrics was once to assemble scientists and engineers from academia and industryto talk about present study paintings and trade rules during this newly rising box. it truly is a space offluid dynamics dedicated to laying naked the principlesofthe lubricated shipping of viscous fabrics reminiscent of crude oil, targeted oil/water emulsion, slurries and pills. It encompasses different types of challenge. stories of migration of particulates clear of partitions, Segre-Silverberg results, lubrication as opposed to carry and shear-induced migration belong to at least one class. many of the technological difficulties are the fluid dynamics ofcore flows emphasizing experiences ofstability, difficulties of start-up, lift-off and whimsical circulate the place gravity reasons the center move to stratify. one other class of difficulties offers with the fouling of pipe partitions with oil, with bad raises in strain gradients or even blocking off. This examine includes topics like adhesion and dynamic touch angles. the subjects ofshear-induced diffusion ofsmall debris and wall slip in sluggish stream are different acceptable topics. machine extensive studiesofflow-induced microstructures and relocating interface difficulties are but extra study instructions. the final consensus used to be that the Symposium used to be an enormous good fortune, even though the variety of displays fell less than expectancies. Scientists from the petroleum undefined, and this contains INTEVEP (Venezuela), Schlumberger and Syncrude Canada Ltd. , and specialists to grease businesses actively participated within the Symposium. The assembly produced new insights which should still result in extra fascinating study paintings and tested contacts for possiblejoint investigations.
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Extra info for IUTAM Symposium on Lubricated Transport of Viscous Materials: Proceedings of the IUTAM Symposium held in Tobago, West Indies, 7–10 January 1997
Sample text
The spring coefficient is determined from the physical properties of the particle material and the curvature of the particle surfaces at the contact point. Similarly, the tangential stiffness is expressed by the properties of the particles[8]. If the static friction exceeds a limit, the dynamic friction acts on the particles by the friction slider. If the time step is chosen sufficiently small, the instantaneous contact force exerted on each particle is determined by the instantaneous relative motion.
84m/s 42 5. Conclusions Three dimensional simulations of liquid-solid flows of coarse particles in a horizontal pipe were performed. The Lagrangian/Eulerian approach was used and DEM was applied to the calculation of particle motion. The obtained results showed the characteristic flow patterns of particles, such as flows with a moving bed or a deposit. In addition, the present relation between the mean fluid velocity and the flow pattern is consistent with the diagram of flow regimes predicted by previous works.
On them, and on the larger waves (c) through (b), the steep side advances. 22 Figure 28, continued. , Liu K. (1993) Friction factor and holdup studies for lubricated pipelining, Int. J. , 19 (6), 1061-1076. D. (1995) Cement lined pipes for water lubricated transport of heavy oil, Int. J. Multiphase Flow, (In press). D. (1996) Direct simulation of interfacial waves in a high viscosity ratio and axisymmetric core annular flow, J. Fluid Mech, 327,1-34. , Bugliarello G. (1966) Concentration redistribution in the shear flow of monolayers of suspended particles.