Measurement of Velocity and Temperature Distributions in a Highly Porous Medium

2000 ◽  
Vol 3 (3) ◽  
pp. 14 ◽  
Author(s):  
Masaaki Okuyama ◽  
Yutaka Abe
Keyword(s):  
Porous Medium ◽  
Temperature Distributions ◽  
Highly Porous

Characterization of Pore Diameters in Highly Porous Media

2003 ◽  
Author(s):  
H. L. Pan ◽  
O. Pickena¨cker ◽  
D. Trimis
Keyword(s):  
Porous Medium ◽  
Porous Media ◽  
Pore Diameter ◽  
Laminar Flame ◽  
Combustible Mixture ◽  
Critical Conditions ◽  
Flame Velocity ◽  
Geometrical Properties ◽  
Highly Porous

In this paper, a method for the experimental characterization of the equivalent pore diameter of highly porous open structures is presented. The commonly used characterization of such structures through geometrical properties like ppi number (porous per inch) and porosity proves to be not sufficient for the characterization of length scales related to heat and mass transfer. The procedure used here utilizes the quenching limits for flame propagation as characterization criterion. The determined equivalent pore diameter corresponds to the quenching diameter for a tube-geometry filled with the same combustible mixture. The quenching limit was determined by adjusting critical conditions, which are defined by a constant critical Pe´clet number comprising the laminar flame velocity instead of the flow velocity. Variations of oxygen content and air ratio were used in order to change the laminar flame speed and find the quenching limit for a given porous medium. The equivalent pore diameter determined with this method is a characteristic length scale of the porous medium geometry and is related to the heat transfer between the gas phase and the solid porous structure. The validation of the method was performed on sphere packings with well-documented properties. Several practically relevant highly porous media like foams and fabric lamellae structures were characterized and the results are discussed. Based on the effective heat conductivity (EHC) models of Zehner, Bauer and Schlu¨nder [1–3] for packed beds, an adapted model for foam structures was developed. The adapted model utilizes the equivalent pore diameters determined in the paper and predictions are presented.

Fuel-Rich Premixed Flame Structure in a Highly Porous Medium

2019 ◽  
Vol 2019.54 (0) ◽  
pp. 122
Author(s):  
Honami OZEKI ◽  
Atsuro HASEGAWA ◽  
Taihei USUI
Keyword(s):  
Porous Medium ◽  
Flame Structure ◽  
Premixed Flame ◽  
Highly Porous

scholarly journals Structure and transient behavior of radiation-controlled flame in a highly porous medium.

1991 ◽  
Vol 57 (533) ◽  
pp. 315-321 ◽  
Author(s):  
Katsunori HANAMURA ◽  
Ryozo ECHIGO ◽  
Yoshio YOSHIZAWA
Keyword(s):  
Porous Medium ◽  
Transient Behavior ◽  
Highly Porous

scholarly journals Steady Flow over a Rotating Disk in Porous Medium with Heat Transfer

2009 ◽  
Vol 14 (1) ◽  
pp. 21-26 ◽  
Author(s):  
H. A. Attia
Keyword(s):  
Heat Transfer ◽  
Porous Medium ◽  
Energy Transfer ◽  
Viscous Fluid ◽  
Steady Flow ◽  
Numerical Solutions ◽  
Rotating Disk ◽  
Incompressible Viscous Fluid ◽  
Governing Equations ◽  
Temperature Distributions

The steady flow of an incompressible viscous fluid above an infinite rotating disk in a porous medium is studied with heat transfer. Numerical solutions of the nonlinear governing equations which govern the hydrodynamics and energy transfer are obtained. The effect of the porosity of the medium on the velocity and temperature distributions is considered.

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