Experimental Assessment of Thermal Radiation Behavior Emitted by Solid Porous Material

Abstract

Porous media burners have been the focus of many studies due to the advantage in different applications in industry, which exhibit a directional emission of thermal radiation and low emission of pollutants. Indeed, these characteristics yields benefits regarding productivity by an environment friendly process. Thus, this work analyzes the behavior of radiation heat flux emitted by materials of different linear densities and porosities, varying the rate of air/fuel mixture and the flame power. In this way, was constructed an experimental setup that consists in a supply system of air/fuel, data acquisition, burner support for the radiation sensor, and the radiometer. This structure enables the displacement from 0°C to 90°C allowing the analysis of radiation in the area of a semisphere. The results shown that the silicon carbide has higher radiation efficiency than zirconia, due the higher thermal conductivity and emissivity. However, the silicon carbide degraded in one of the measurements. The ZrO2 media has proved challenging to stabilize for equivalence ratios below 0.6. Regarding the porosity, it is concluded that the higher the porosity, the greater the radiation efficiency, the expected result because there is a larger contact area for the reaction to occur within the pores.

Numerical simulation for the determination of the radiative properties of spherical packed bed porous media: A COMSOL Multiphysics Study

“…21 Researchers have traditionally regarded direct experiments as the most reliable means for the measure of the radiative properties of such a complex medium. 20,[22][23][24] Unfortunately, this method is expensive and extremely challenging. A number of researchers have addressed analytical solutions derived from extensive measurements and validations.…”

Hierarchical Criticality Analysis of Clean Technologies Applied to a Coal-Fired Power Plant

“…Although Brazilian coal has low calorific value, the availability of reserves and the development of less polluting technologies suggest thermal generation as an excellent expansion potential [16][17][18][19]. The Brazilian electricity sector emitted an average of 101.3 kg CO2 to produce 1 MWh, a low rate compared to the European Union, the United States of America, and China [20,21].…”

Synthesis of ZSM-5 Zeolite from Metakaolin and Rice Husk Ash to CO2 Adsorption

“…26 Most of the clay minerals have a layered crystalline structure which can shrink or swell, just like water is absorbed or removed between layers. 27 On the other hand, zeolites have a rigid and three-dimensional crystalline structure that consists of a network of interconnected channels and cages. 28 Water and ions move freely in and out of the pores, but the structure remains rigid.…”