بانک مقالات

تخلیه خودبه خودی مایعات ویسکوز در لوله های عمودی و شیب دار

Self-drainage of viscous liquids in vertical and inclined pipes

سال انتشار : 2016

تعداد صفحه : 17

کلیدواژه ها:  Cleaning, Drainage, Fluid mechanics, Laminar, Shear-thinning, Thixotropy

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ABSTRACT

The rate of drainage of a viscous liquid from initially full cylindrical tubes inclined at various angles to the vertical (0◦, 30◦, 45◦ and 60◦) was studied in glass and polymethylmethacrylate (PerspexTM) tubes of various lengths and diameters using three food materials: honey (Newtonian) and two variants of MarmiteTM spread (both exhibiting complex rheological behaviour, including shear-thinning and thixotropy). The behaviour was marked by an initially steady rate of drainage in which an air slug descended the tube, followed by slower drainage from an annular film remaining on the wall. Eventually the liquid stopped draining as a filament and entered a dripping regime. Drainage was insensitive to the tube material, whereas the stages of drainage were influenced by the geometry and angle of inclination. Quantitative models are presented for the rate and extent of the initial drainage stage, the rate in a second linear stage (where it existed), and the rate of drainage in the third, falling rate stage. The fourth and final stage, characterised by drop formation, was not modelled. The initial rate can be predicted with reasonable accuracy, allowing the time to remove approximately 50% of the material in a short waiting phase to be calculated, e.g. t = 8L/R2for a Newtonian liquid with kinematic viscosity  in a vertical pipe of radius R and length L. The agreement with the other models is less exact but they capture the general trends reasonably.

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مجلات و ژورنال های بین المللی

Elsevier

ترجمه

نوع فایل

رایگان

سال انتشار

2016

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