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On the response of a spherical parti...

Wakaba, Lulama V.

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On the response of a spherical particle to unsteady flows at finite Reynolds numbers.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	On the response of a spherical particle to unsteady flows at finite Reynolds numbers./
Author:	Wakaba, Lulama V.
Description:	177 p.
Notes:	Adviser: S. Balachandar.
Contained By:	Dissertation Abstracts International68-02B.
Subject:	Applied Mechanics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3250340

On the response of a spherical particle to unsteady flows at finite Reynolds numbers.
Wakaba, Lulama V.

On the response of a spherical particle to unsteady flows at finite Reynolds numbers. - 177 p.

Adviser: S. Balachandar.

Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2006.

Particle-laden flows play a critical role in a vast number of natural and engineering applications. In such flows the transport of particles by a carrier fluid is modeled through the use of a force law that attempts to capture the most essential physics. The development of accurate force models hinges on a clear understanding of the unsteady interactions that occur between a single particle and complex ambient flows. In this thesis, we focus primarily on the validation and improvement of current representations of hydrodynamic force for relatively large particles with Reynolds numbers (Re) that range between 5 and 400.Subjects--Topical Terms:

1018410
Applied Mechanics.

On the response of a spherical particle to unsteady flows at finite Reynolds numbers.
LDR:02958nam 2200301 a 45 001 972728
005 20110928
008 110928s2006 eng d
035 $a (UMI)AAI3250340
035 $a AAI3250340
040 $a UMI $c UMI
100 1 $a Wakaba, Lulama V. $3 1296701
245 1 0 $a On the response of a spherical particle to unsteady flows at finite Reynolds numbers.
300 $a 177 p.
500 $a Adviser: S. Balachandar.
500 $a Source: Dissertation Abstracts International, Volume: 68-02, Section: B, page: 1043.
502 $a Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2006.
520 $a Particle-laden flows play a critical role in a vast number of natural and engineering applications. In such flows the transport of particles by a carrier fluid is modeled through the use of a force law that attempts to capture the most essential physics. The development of accurate force models hinges on a clear understanding of the unsteady interactions that occur between a single particle and complex ambient flows. In this thesis, we focus primarily on the validation and improvement of current representations of hydrodynamic force for relatively large particles with Reynolds numbers (Re) that range between 5 and 400.
520 $a We begin with a study of the role of acceleration history on the lift force of a spherical particle in a linear shear flow. The lift-history kernel is observed to be oscillatory and this oscillatory behavior translates to non-monotonic changes in the lift force for corresponding monotonic changes in the relative velocity between the particle and ambient flow.
520 $a In a subsequent study, the role of added mass is investigated at finite Re. The added-mass coefficient of a spherical particle is found to be 1/2 for all Reynolds numbers regardless of the magnitude of particle acceleration (or deceleration). These results are explained using a simple theory and are shown to be valid only when the time scale of acceleration (or deceleration) is smaller than the inertial and viscous time scales of the flow.
520 $a The effect of turbulence on the motion of a freely settling particle is also investigated. In all cases considered, the inertial response time of the particle is the same as the Kolmogorov time scale of the freestream turbulence. Over the parameter range considered, turbulence is found to have a minor effect on the mean drag and lift forces on the particle. Furthermore, turbulence is found to have a significant impact on the settling rate. We present a simple explanation of these results using physical arguments. Finally, the influence of a particle wake on freestream turbulence is addressed.
590 $a School code: 0090.
650 4 $a Applied Mechanics. $3 1018410
650 4 $a Physics, Fluid and Plasma. $3 1018402
690 $a 0346
690 $a 0759
710 2 0 $a University of Illinois at Urbana-Champaign. $3 626646
773 0 $t Dissertation Abstracts International $g 68-02B.
790 $a 0090
790 1 0 $a Balachandar, S., $e advisor
791 $a Ph.D.
792 $a 2006
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3250340