The Flow of Viscoelastic Fluids Through Porous Media PDF Download
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Author: N. V. Tyabin
Publisher:
ISBN:
Category :
Languages : en
Pages : 7
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Book Description
Author: N. V. Tyabin
Publisher:
ISBN:
Category :
Languages : en
Pages : 7
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Book Description
Author: Julio A. Deiber
Publisher:
ISBN:
Category :
Languages : en
Pages : 246
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Author: Ronnie Yip
Publisher:
ISBN: 9780494780640
Category :
Languages : en
Pages : 328
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Book Description
This thesis reports on an experimental study of slow viscoelastic flow through models of fibrous porous media. The models were square arrays of parallel cylinders, with solid volume fractions or 'solidities' of 2.5%, 5.0%, and 10%. An initial study using a Newtonian fluid provided a baseline for comparison with results for two Boger fluids, so that the effects of fluid elasticity could be determined. Boger fluids are elastic fluids that have near constant viscosities and can be used in experiments without having to account for shear-thinning effects. The experimental approach involved measurements of pressure loss through the three arrays and interior velocity measurements using particle image velocimetry (PIV).For the Newtonian flows, pressure loss measurements were in good agreement with the analytical predictions of Sangani and Acrivos (1982). PIV measurements showed velocity profiles which were symmetrical and independent of flow rate.Pressure loss measurements for the Boger fluid flows revealed that the onset of elastic effects occurred at a Deborah number of approximately 0.5, for both fluids and the three arrays. Flow resistance data collapsed for the two Boger fluids, and increased with solidity. For all three models, the flow resistance increased monotonically with Deborah number, reaching values up to four times the Newtonian resistance for the 10% model.An analysis of fluid stresses reveals that the elastic flow resistance is attributed to additional normal stresses caused by shearing, and not by extension.PIV measurements showed that the transverse velocity profiles for the Newtonian and Boger fluids were the same at Deborah numbers below the elastic onset. Above onset, the profiles became skewed. The skewness, like the flow resistance, was observed to increase with both Deborah number and solidity.In the wake regions between cylinders in a column, periodic flow structures formed in the spanwise direction. The structures were staggered from column to column, consistent with the skewing. As either Deborah number or solidity increased, the flow structures became increasingly three-dimensional, and the stagger became more symmetric.
Author: Royal Eugene Collins
Publisher: Pennwell Books
ISBN:
Category : Science
Languages : en
Pages : 290
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Author: Bayram Alakus
Publisher:
ISBN:
Category :
Languages : en
Pages : 562
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Author: Adrian E. Scheidegger
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 382
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Book Description
Author: M. Muskat
Publisher: Springer
ISBN:
Category : Science
Languages : en
Pages : 792
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Book Description
Author: Hee Chung Park
Publisher:
ISBN:
Category : Fluid dynamics
Languages : en
Pages : 746
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Author: Jacob Bear
Publisher:
ISBN:
Category : Fluid dynamics
Languages : en
Pages : 398
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Book Description
Author: D.A. Siginer
Publisher: Elsevier
ISBN: 0080540554
Category : Technology & Engineering
Languages : en
Pages : 895
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Book Description
These two volumes contain chapters written by experts in such areas as bio and food rheology, polymer rheology, flow of suspensions, flow in porous media, electrorheological fluids, etc. Computational as well as analytical mathematical descriptions, involving appropriate constitutive equations deal with complex flow situations of industrial importance. This work is unique in that it brings together state of the art reviews and recent advances in a variety of areas, involving viscoelastic materials, in a desirable and timely manner.
