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Stagnation point flow and heat trans...

Stanford University.

Stagnation point flow and heat transfer under free-steam turbulence.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Stagnation point flow and heat transfer under free-steam turbulence.
Author:	Xiong, Zhongmin.
Description:	219 p.
Notes:	Adviser: Sanjiva K. Lele.
Notes:	Source: Dissertation Abstracts International, Volume: 65-09, Section: B, page: 4640.
Contained By:	Dissertation Abstracts International65-09B.
Subject:	Physics, Fluid and Plasma.
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3145576
ISBN:	0496045385

Stagnation point flow and heat transfer under free-steam turbulence.
Xiong, Zhongmin.

Stagnation point flow and heat transfer under free-steam turbulence. - 219 p.

Adviser: Sanjiva K. Lele.

Thesis (Ph.D.)--Stanford University, 2004.

In the theoretical study, the distortion of three dimensional unsteady disturbances in an incompressible Hiemenz boundary layer and its effects on heat, transfer are analyzed using linear vortex dynamics. An asymptotic expression for the vorticity evolution is obtained with explicit dependence on the length scale and frequency of the disturbance. It is shown that the vorticity amplification, and hence the heat transfer enhancement, increases with decreasing length scale, and the maximum value is found to be around five times the boundary layer thickness. Extending the analysis to free-stream turbulence, we derive a new scaling correlation for the relative heat transfer enhancement which incorporates turbulence intensity, integral length scale and mean flow Reynolds number. This correlation parameter is shown to reasonably collapse recent experimental data.

ISBN: 0496045385Subjects--Topical Terms:

227264
Physics, Fluid and Plasma.

Stagnation point flow and heat transfer under free-steam turbulence.
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245 1 0 $a Stagnation point flow and heat transfer under free-steam turbulence.
300 $a 219 p.
500 $a Adviser: Sanjiva K. Lele.
500 $a Source: Dissertation Abstracts International, Volume: 65-09, Section: B, page: 4640.
502 $a Thesis (Ph.D.)--Stanford University, 2004.
520 # $a In the theoretical study, the distortion of three dimensional unsteady disturbances in an incompressible Hiemenz boundary layer and its effects on heat, transfer are analyzed using linear vortex dynamics. An asymptotic expression for the vorticity evolution is obtained with explicit dependence on the length scale and frequency of the disturbance. It is shown that the vorticity amplification, and hence the heat transfer enhancement, increases with decreasing length scale, and the maximum value is found to be around five times the boundary layer thickness. Extending the analysis to free-stream turbulence, we derive a new scaling correlation for the relative heat transfer enhancement which incorporates turbulence intensity, integral length scale and mean flow Reynolds number. This correlation parameter is shown to reasonably collapse recent experimental data.
520 # $a Large eddy simulations (LES), using fourth order finite differences in curvilinear coordinates in conjunction with an efficient linearized dual-time snub-iteration scheme, are performed to study free-stream turbulence impingement, upon an elliptical leading edge and the resulting heat transfer enhancement. A new blending procedure is developed through which independent, statistically identical realizations of homogeneous isotropic turbulence are combined to provide realistic representations of the free-stream turbulence. Results for different free-stream turbulence intensity, length scale, and Mach number are presented. Turbulence statistics and Reynolds stress budget at different streamwise locations are examined in detail. It is found that small scale, intense vortical structures generated by vortex stretching near the leading edge are directly responsible for the elevated heat transfer. The numerical results on the heat transfer enhancement show good agreement with the experimental measurements.
520 # $a Stagnation point flow and heat transfer in the presence of free-stream turbulence is investigated through both numerical simulation and theoretical analysis.
590 $a School code: 0212.
650 # 0 $a Physics, Fluid and Plasma. $3 227264
690 $a 0759
710 0 # $a Stanford University. $3 212607
773 0 # $g 65-09B. $t Dissertation Abstracts International
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790 1 0 $a Lele, Sanjiva K., $e advisor
791 $a Ph.D.
792 $a 2004
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