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viscoplastic fluid flows through an abrupt contraction
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DOR
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20.1001.2.9919199705.1399.11.1.230.5
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نویسنده
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- - ,- - ,- -
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منبع
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كنگره مهندسي شيمي - 1399 - دوره : 11 - یازدهمین کنگره بین المللی مهندسی شیمی - کد همایش: 99191-99705
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چکیده
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Numerical simulations were performed for the creeping flow of a yield-stress fluid through a sudden contraction using the herschel-bulkley model with a papanastasiou's modification# the influence of yield-stress and contraction ratio values on the structure of the flow was investigated# all the simulations were carried out for 2d, 3d, and axisymmetric geometries# the detailed structure of flow shows two rigid zones, one located at the corner of the contraction (rigid static zone) and one located close to the center-line of the channel (rigid moving zone)# when yield stress increases, the size of the rigid dead zones increases significantly# moreover, the pressure losses are given with yield stress, contraction ratio, and geometry# it is seen that 2d and axisymmetric models are not accurate indicating the need to account for the cross-section shape# finally, the numerical results are compared with the available numerical and experimental data#
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کلیدواژه
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yield-stress ,bingham number ,herschel-bulkley ,3d models ,un-yielded zones
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آدرس
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tehran university, iran, tehran university, iran, tehran university, iran
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Authors
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