Computational analysis of flow structure and particle deposition in a single asthmatic human airway bifurcation

2010 ◽  
Vol 43 (13) ◽  
pp. 2453-2459 ◽  
Author(s):  
Honglin Zhang ◽  
George Papadakis
Keyword(s):  
Flow Structure ◽  
Particle Deposition ◽  
Computational Analysis ◽  
Human Airway ◽  
Airway Bifurcation

Inspiratory particle deposition in airway bifurcation models

1991 ◽  
Vol 22 (1) ◽  
pp. 15-30 ◽  
Author(s):  
Imre Balásházy ◽  
Werner Hofmann ◽  
Ted B. Martonen
Keyword(s):  
Particle Deposition ◽  
Airway Bifurcation

Film Cooling From Short Holes With Sister Hole Influence

2012 ◽  
Author(s):  
Marc J. Ely ◽  
B. A. Jubran
Keyword(s):  
Flow Field ◽  
Flow Structure ◽  
Film Cooling ◽  
Computational Analysis ◽  
Numerical Study ◽  
Vortical Flow ◽  
Injection Hole ◽  
Hole Configuration ◽  
Adiabatic Effectiveness ◽  
Structure Research

This paper reports a computational analysis on the effect of sister hole control on film cooling from short holes. The proposed method includes surrounding a primary injection hole by two or four smaller sister holes to actively maintain flow adhesion along the surface of the blade. A numerical study using the realizable k-ε turbulence model led to the determination that the use of sister holes significantly improves adiabatic effectiveness by countering the primary vortical flow structure. Research was carried out to determine the optimum hole configuration, arriving at the conclusion that placing sister holes slightly downstream of the primary injection hole improves the near-hole effectiveness, while placing sister holes slightly upstream of the primary hole improves downstream effectiveness. Similar results were found in evaluating both long and short hole geometries with a significantly less coherent flow field arising from the short hole. However, on the whole, the sister hole approach to film cooling was found to offer viable improvements over standard cooling regimes.

Measurements of Flow Modification by Particle Deposition Inside a Packed Bed Using Time-Resolved PIV

2008 ◽  
Author(s):  
Elvis E. Dominguez-Ontiveros ◽  
Carlos Estrada-Perez ◽  
Yassin A. Hassan
Keyword(s):  
Heat Transfer ◽  
Velocity Field ◽  
Flow Structure ◽  
Particle Deposition ◽  
Packed Bed ◽  
Packed Bed Reactor ◽  
Temperature Fields ◽  
Complex Flow ◽  
Flow Modification ◽  
Complex Flow Structure

In the Advanced Gas Cooled Pebble Bed Reactors for nuclear power generation, the fuel is spherical coated particles. The energy transfer phenomenon requires detailed understanding of the flow and temperature fields around the spherical fuel pebbles. Detailed information of the complex flow structure within the bed is needed. Generally, for computing the flow through a packed bed reactor or column, the porous media approach is usually used with lumped parameters for hydrodynamic calculations and heat transfer. While this approach can be reasonable for calculating integral flow quantities, it may not provide all the detailed information of the heat transfer and complex flow structure within the bed. The present experimental study presents the full velocity field using particle image velocity technique (PTV) in a conjunction with matched refractive index fluid with the pebbles to achieve optical access. Velocity field measurements are presented delineating the complex flow structure.

scholarly journals An asymptotic model of particle deposition at an airway bifurcation

2012 ◽  
Vol 30 (2) ◽  
pp. 131-156 ◽  
Author(s):  
J. R. Zierenberg ◽  
D. Halpern ◽  
M. Filoche ◽  
B. Sapoval ◽  
J. B. Grotberg
Keyword(s):  
Particle Deposition ◽  
Asymptotic Model ◽  
Airway Bifurcation
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