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Flow past a cylinder: Effect of sur...

Saelim, Nattapong.

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Flow past a cylinder: Effect of surface modification on structure of the near-wake.

紀錄類型:	書目-電子資源 : Monograph/item
Title/Author:	Flow past a cylinder: Effect of surface modification on structure of the near-wake./
Author:	Saelim, Nattapong.
Description:	259 p.
Notes:	Source: Dissertation Abstracts International, Volume: 64-04, Section: B, page: 1880.
Contained By:	Dissertation Abstracts International64-04B.
Subject:	Engineering, Mechanical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3086965
ISBN:	0496347543

Flow past a cylinder: Effect of surface modification on structure of the near-wake.
Saelim, Nattapong.

Flow past a cylinder: Effect of surface modification on structure of the near-wake. - 259 p.

Source: Dissertation Abstracts International, Volume: 64-04, Section: B, page: 1880.

Thesis (Ph.D.)--Lehigh University, 2003.

The near-wake of a cylinder with a surface nonuniformity is addressed. A helical wire pattern about the surface of a cylinder, whereby the wire has a diameter an order of magnitude smaller than the cylinder diameter, induces substantial alterations of both the quasi-two-dimensional (sectional) and the three-dimensional wake structure. A technique of high-image-density particle image velocimetry is employed in order to characterize the instantaneous and averaged flow patterns in three orthogonal planes in the near-wake.

ISBN: 0496347543Subjects--Topical Terms:

783786
Engineering, Mechanical.

Flow past a cylinder: Effect of surface modification on structure of the near-wake.
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100 1 $a Saelim, Nattapong. $3 1935685
245 1 0 $a Flow past a cylinder: Effect of surface modification on structure of the near-wake.
300 $a 259 p.
500 $a Source: Dissertation Abstracts International, Volume: 64-04, Section: B, page: 1880.
500 $a Adviser: Donald O. Rockwell.
502 $a Thesis (Ph.D.)--Lehigh University, 2003.
520 $a The near-wake of a cylinder with a surface nonuniformity is addressed. A helical wire pattern about the surface of a cylinder, whereby the wire has a diameter an order of magnitude smaller than the cylinder diameter, induces substantial alterations of both the quasi-two-dimensional (sectional) and the three-dimensional wake structure. A technique of high-image-density particle image velocimetry is employed in order to characterize the instantaneous and averaged flow patterns in three orthogonal planes in the near-wake.
520 $a In order to provide a basis for interpretation of the wake induced by the helical wire pattern, reference states of the wake from the plain cylinder are defined over a range of Reynolds number, based on cylinder diameter, up to 10,000.
520 $a For the case of the cylinder with the helical winding, extreme cases of quasi-laminar and turbulent near-wakes from the corresponding plain (smooth) cylinder are considered. Quasi-two-dimensional (sectional) patterns of instantaneous or phase-referenced vorticity show large variations with the effective angle of incidence of the helical wire at a given spanwise location. Extreme types of patterns involve: (i) a relatively narrow wake with lack of large-scale vorticity concentrations; and (ii) a wide wake with well-defined, large-scale concentrations that are formed well downstream of the cylinder. The effective width of the near-wake can vary by as much as 50%, despite the very small diameter of the helical wire. A distinctive, additional feature at Re = 104 is the occurrence of coherent patterns of small-scale, shear layer vortices, which are evident at all values of incidence angle.
520 $a Corresponding patterns of the flow structure in planes oriented along the span of the cylinder show deterministic features of three-dimensionality, which are linked to the aforementioned sectional patterns. For the quasi-laminar wake at low Reynolds number, the three-dimensional structure of the near-wake undergoes a well-defined transformation with increasing distance from the base. Space-time volumes of vorticity and velocity evolve from a predominantly in-line form to a staggered form. For the turbulent wake at higher Reynolds number, the three-dimensional patterns are less deterministic, but they show a spanwise spatial periodicity that is correlated to the helical wire pattern.
590 $a School code: 0105.
650 4 $a Engineering, Mechanical. $3 783786
650 4 $a Physics, Fluid and Plasma. $3 1018402
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710 2 0 $a Lehigh University. $3 515436
773 0 $t Dissertation Abstracts International $g 64-04B.
790 1 0 $a Rockwell, Donald O., $e advisor
790 $a 0105
791 $a Ph.D.
792 $a 2003
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3086965