Fuel Pyrolysis through Porous Media:  Coke Formation and Coupled effect on Permeability

Fau, Guillaume; Gascoin, Nicolas; Bouchez, Marc; Gillard, Philippe; Steelant, Johan

doi:10.2514/6.2011-2206

Cited by 8 publications

(2 citation statements)

References 28 publications

(4 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In previous works, a high pressure test bench with one inlet and one outlet configuration has been developed (Gascoin 2011, Fau et al 2012). It has been tested on different type of metal and composite samples to determine the Darcian's and Forchheimer's permeabilities for inert and reactive fluids at high temperature and pressure.…”

Section: Flow Configuration Influence On Darcian and Forchheimer Permmentioning

confidence: 99%

Flow Configuration Influence on Darcian and Forchheimer Permeabilities Determination

Najmi

Tabach

Chetehouna

et al. 2016

Lecture Notes in Mechanical Engineering

Self Cite

View full text Add to dashboard Cite

Within the framework of fuel cells, porous materials are used for filtration purpose. Determining physical properties like porosity and permeability are of utmost importance to predict and to manage filtration efficiency of the materials. The permeability of materials is often determined experimentally in laboratory with disc samples (outlet of the flow is achieved through the porous material) that are not exactly similar to the tubes which are used in realistic operating conditions (a main flow is found additionally to the one through the material). Thus, the effect of a second outlet on the Darcian's permeability characterization bench should be studied. In the present paper, we present a new test bench to determine experimentally the Darcy's and Forchheimer's permeabilities for a porous media by taking into account two outlets. Operating parameters (temperature, pressure and mass flow rate) are measured for three different configurations:O is 100% open. Then Darcy's and Forchheimer's permeability for all these three cases are compared and discussed in details. It has been found that the secondary outlet opening does not affect the Darcian's permeability but have substantial influence on the Forchheimer's one through the modifications of the range of study (lower mass flow rate penetrates the porous medium).

show abstract

Section: Flow Configuration Influence On Darcian and Forchheimer Permmentioning

confidence: 99%

Flow Configuration Influence on Darcian and Forchheimer Permeabilities Determination

Najmi

Tabach

Chetehouna

et al. 2016

Lecture Notes in Mechanical Engineering

Self Cite

View full text Add to dashboard Cite

show abstract

“…For example, the combustion chamber of SCRamjet engine is expected to be cooled directly by the fuel which filtrates through the porous wall (internal convection, film cooling and endothermic pyrolysis) [1][2][3][4][5]. Due to reacting process (pyrolysis coupled to heat and mass transfer), to coke formation and to degradation of the composite structure itself, the permeability is expected to change strongly (several orders of magnitude) [6]. Since this permeability controls the cooling efficiency, it is necessary to monitor its variation in realtime and in situ.…”

mentioning

confidence: 99%

Determination of Darcian permeability of porous material by infrared spectrometry

2011

Self Cite

View full text Add to dashboard Cite

The active cooling of aerospace structures can be performed by the use of porous materials. It requires characterizing its permeability to predict the cooling efficiency by means of Computational Fluid Dynamics codes. The Darcian term is generally deduced experimentally from a relationship between the mass flow rate and the pressure drop through the porous media. Due to thermochemical process involved in the cooling, the permeability can change. It is currently not possible with common techniques to determine these variations during the flight. This paper presents a novel approach taking advantage of well known flow behaviour in chemical reactor engineering in order to propose a real-time in situ quantification of the Darcian permeability. The residence time distribution is analyzed thanks to tracer injection and to associated experimental measures of Infra-Red signals. The IR peak characteristics (height, width, surface, rising and falling gradients) and time delays are analyzed and correlated to physical parameters (mass flow rate, injected mass of tracer, properties of fluids). The peak height and surface and the rising gradient vary linearly in the same sense as the injected tracer mass while the falling gradient varies in the opposite sense. Both gradients decrease with a mass flow rate increase. The time delay between injection and detection of the tracer is quite constant except when changing the fluid nature. A design of experiments allowed estimating quantitatively the influence of each physical parameter on the optical one of the IR signal. Thanks to this first understanding, the Darcian permeability is linked to the observed IR signal. A linear regression is proposed with the peak width which is judged to be the most relevant parameter. Finally, an analytical approach is developed to fit ordinary differential equations to IR peak measures and to correlate the parameters of the law to the Darcian permeability. Several laws (linear, logarithmic and power) are proposed depending on the parameter but the linear regression involving the coefficient noted b 1 is the most promising. One of the advantages of this method is to be able measuring the permeability during the flight and not only on-ground with specific test facility.

show abstract

An Experimental Study on Flow of Micronized Silicon Carbide Particles Through Sintered Porous Materials

Chinnaraj¹,

Tabach²,

Chetehouna³

et al. 2016

Lecture Notes in Mechanical Engineering

Self Cite

View full text Add to dashboard Cite

Transport of suspended particles in porous media occurs in numerous processes of civil engineering and aerospace engineering. Literature survey indicating the mechanism of movement of suspended particles through porous media and the subsequent damage in engineering environment are not sufficiently known. This paper deals with a new concept of a laboratory test bench which permits to better understand the mechanism of particle intrusion into porous media. The results of the laboratory studies on the flow of suspended particles (Silicon Carbide) through sintered porous material (Stainless Steel) are discussed. The effects of flow rate and particle concentrations on the amount of damage (i.e., permeability impairment) and depth of penetration (from inlet towards outlet) are emphasized particularly.

show abstract

Fuel Pyrolysis through Porous Media: Coke Formation and Coupled effect on Permeability

Cited by 8 publications

References 28 publications

Flow Configuration Influence on Darcian and Forchheimer Permeabilities Determination

Flow Configuration Influence on Darcian and Forchheimer Permeabilities Determination

Determination of Darcian permeability of porous material by infrared spectrometry

An Experimental Study on Flow of Micronized Silicon Carbide Particles Through Sintered Porous Materials

Contact Info

Product

Resources

About