3.6 Laminar flow in a concentric annulus
The flow of non-Newtonian fluids through concentric and eccentric annuli
represents an idealisation of several industrially important processes. One
important example is in oil well drilling where a heavy drilling mud is
circulated through the annular space around the drill pipe in order to carry the
drilling debris to the surface. These drilling muds are typically either Bingham
plastic or power-law type fluids. Other examples include the extrusion
of plastic tubes and pipes in which the molten polymer is forced through
an annular die, and the flow in double-pipe heat exchangers. In all these
applications, it is often required to predict the frictional pressure gradient to
sustain a fixed flow rate or vice versa. In this section, the isothermal, steady and
fully-developed flow of power-law and Bingham plastic fluids in concentric
annulus is analysed and appropriate expressions and/or charts are presented
which permit the calculation of pressure gradient for a given application
المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .
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