Rheological Property Measurements
For non-Newtonian ?uids, specifying the appropriate rheological properties for a particular ?uid is
formidable because such ?uids are usually not pure substances but various kinds of mixtures. This
means that the properties are not available in handbooks or other reference materials but must be
measured for each particular application. A discussion of the various instruments for measuring
lableirheological properties is outside the scope of the present section, but a number of sources are ava
),7which describe different rheological property measurement techniques and instruments: Skelland (196
Whorlow (1980), Irvine and Karni (1987), and Darby (1988). Figure 3.9.5 is an illustration of
experimental ?ow curves measured with a falling needle viscometer and a square duct viscometer for
dpolymer solutions of different concentrations. Also known in the ?gure as solid lines is the modi?e
epower law equation used to represent the experimental data. It is seen that Equation (3.9.5) ?ts th
rexperimental data within ±2%. Table 3.9.1 lists the rheological properties used in the modi?ed powe
vital law equations in Figure 3.9.5. It must be emphasized that a proper knowledge of these properties is
. to the prediction of u?id mechanics and heat transfer phenomena in rheological ?uids
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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