001 |
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376859 |
020 |
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|a9781109233339
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035 |
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|aAAI3363321
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035 |
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|a(UMI)AAI3363321
|
040 |
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|aTWNTU|cTWNTU|dTWNTU
|
095 |
|
|d008|tDDC|pNR001 00391263
|
100 |
1
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|aMotavalizadeh Ardekani, Arezoo.
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245 |
10
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|aParticle interaction, deformation, and collision in viscous and viscoelastic fluids.
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300 |
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|a234 p.
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500 |
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|aSource: Dissertation Abstracts International, Volume: 70-06, Section: B, page: 3751.
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500 |
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|aAdviser: Roger H. Rangel.
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502 |
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|aThesis (Ph.D.)--University of California, Irvine, 2009.
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520 |
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|aThe motion of solid particles in a fluid plays an important role in sedimentation, crystal growth, suspension rheology, and microfluidic devices such as mechanical cell lysis. Although the collision of particles in Newtonian fluids has been well studied experimentally, the effects of particle collision on cell breakup are poorly understood. In order to explore the effects of particle interaction on droplet (simplified cell) breakup, a Distributed-Lagrange-Multiplier computational method for colliding particles in a laminar viscous flow is developed. Comparison of the present methodology with experimental studies for the bouncing motion of a spherical particle onto a wall shows very good agreement and validates the collision model. The results show that the presence of particles leads to a larger droplet deformation, and a perforation in the center of the droplet. Additionally, a theoretical analysis of dilute particulate flow is performed and the explicit equation of motion for two particles moving in a Stokes flow using the method of reflections is derived. The results indicate that the Basset force corresponding to the motion of two spheres is larger than the solitary-particle Basset force. In the above mentioned study, particle interaction and collision in a Newtonian fluid was investigated. The suspensions of cells and DNA, however, exhibit viscoelasticity. Particle interaction in viscoelastic fluids are dramatically different than in Newtonian fluids: particles disperse in the laminar flow of Newtonian fluids while they aggregate in viscoelastic fluids. An analysis based on second-order fluid model is performed and it suggests that the chaining of particles in viscoelastic liquids is the result of local effects and is due to three fundamental causes: (1) viscoelastic "pressure" due to shear; (2) the total time derivative of the Stokes pressure; (3) the change in the sign of the normal stress, which is a purely extensional effect. Finally, particle-wall collsion in a polymeric liquid which shows both viscoelasticity and shear thinning is experimentally investigated. This study indicates that the results for the coefficient of restitution in polymeric liquids can be collapsed together with the Newtonian fluid behavior if one defines the Stokes number based on the local strain rate.
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590 |
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|aSchool code: 0030.
|
650 |
4
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|aApplied Mechanics.
|
650 |
4
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|aEngineering, Chemical.
|
650 |
4
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|aEngineering, Mechanical.
|
690 |
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|a0346
|
690 |
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|a0542
|
690 |
|
|a0548
|
710 |
2
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|aUniversity of California, Irvine.
|
773 |
0
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|tDissertation Abstracts International|g70-06B.
|
790 |
10
|
|aRangel, Roger H.,|eadvisor
|
790 |
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|a0030
|
791 |
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|aPh.D.
|
792 |
|
|a2009
|
805 |
|
|aNTTU|bN|cN108061|d008|pNR|fFRANK|zNR|m0|tDDC
|
856 |
40
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|uhttp://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3363321
|