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Transport of microscopic particles i...

Laker, Travis Shane.

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Transport of microscopic particles in microchannels and microbubbles.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Transport of microscopic particles in microchannels and microbubbles./
作者:	Laker, Travis Shane.
面頁冊數:	188 p.
附註:	Source: Dissertation Abstracts International, Volume: 64-03, Section: B, page: 1455.
Contained By:	Dissertation Abstracts International64-03B.
標題:	Engineering, Mechanical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3084977

Transport of microscopic particles in microchannels and microbubbles.
Laker, Travis Shane.

Transport of microscopic particles in microchannels and microbubbles. - 188 p.

Source: Dissertation Abstracts International, Volume: 64-03, Section: B, page: 1455.

Thesis (Ph.D.)--Georgia Institute of Technology, 2003.

The effect of microscopic particles on hydrodynamics and heat transfer in microchannels subject to turbulent flow was investigated, and a Monte-Carlo simulation of the transport of microscopic particles in spherical and oscillating bubbles was performed.Subjects--Topical Terms:

783786
Engineering, Mechanical.

Transport of microscopic particles in microchannels and microbubbles.
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245 1 0 $a Transport of microscopic particles in microchannels and microbubbles.
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500 $a Source: Dissertation Abstracts International, Volume: 64-03, Section: B, page: 1455.
500 $a Director: S. Mostafa Ghiaasiaan.
502 $a Thesis (Ph.D.)--Georgia Institute of Technology, 2003.
520 $a The effect of microscopic particles on hydrodynamics and heat transfer in microchannels subject to turbulent flow was investigated, and a Monte-Carlo simulation of the transport of microscopic particles in spherical and oscillating bubbles was performed.
520 $a The anomalous and opposing trends in published data dealing with turbulent flow friction factor and heat transfer coefficient in microchannels, and their apparent disagreement with macroscale correlations, are investigated. It is shown that the modification of turbulent eddy diffusivities, consistent with the way suspended particles may modify turbulence, can explain the observed higher-than-expected heat transfer coefficients in some data. It is therefore suggested that suspended microscopic particles may be a major contributor to the aforementioned inconsistencies and disagreements in some of the published data.
520 $a The dynamic transport and removal of suspended microscopic particles in spherical and oscillating bubbles rising in quiescent liquid pools are modeled based on a hybrid Eulerian-Monte-Carlo numerical analysis. The bubble internal circulation is obtained by assuming that it is similar to Hill's vortex flow for non-oscillating bubbles. The transport of particles is rendered by a Monte-Carlo analysis, based on the simultaneous solution of the equations of motion for a large number of particles in the LaGrangian frame. The particle equations of motion account for the following displacement mechanisms: sedimentation, inertia, convection, and Brownian (modeled by an appropriately defined random force). For non-oscillating microbubbles, parametric calculations are presented and compared with relevant Eulerian models, including the widely used method of Fuchs (1964). The strength of bubble internal circulation is shown to be a key parameter affecting the particles.
520 $a Vibrating spherical bubbles are assumed to undergo second-mode shape oscillations while supporting laminar internal circulation. Parametric calculations are presented to examine the effect of oscillations on particle removal rate from bubbles, and its sensitivity to particle and bubble size. The results show that oscillations enhance the particle removal rate from bubbles. The enhancement effect increases with reduction of the particle diameter, increased bubble diameter, and increased oscillation amplitude. For sub-micron particles suspended in mm-size bubbles, for example, oscillations could increase particle removal rates by orders of magnitude.
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650 4 $a Engineering, Nuclear. $3 1043651
650 4 $a Engineering, Environmental. $3 783782
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790 $a 0078
791 $a Ph.D.
792 $a 2003
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3084977