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Impact of Surface Radiation

Thermal radiation heat transfer from the hot catalytic surfaces is usually neglected in microreactor studies. However, it can have a strong impact not only on the [Pg.61]

Stability limits but also on the combustion processes weU-inside the stability envelope. In the foregoing analysis a surface emissivity s — 0.6 was considered (its precise value depends on the type of washcoat, the catalyst loading, the surface treatment, etc.). In Case A, which is located well-below the stability limits, the catalyst surface temperatures are everywhere high ( 1,200 K, Fig. 6.4). Detailed energy balance of the solid (similar to that of the following Fig. 6.8) indicates that radiation is a net heat loss mechanism over the entire length of the catalytic surface because heat is radiated towards the significantly colder entry (700 K). Computed catalyst surface temperatures for Case A are shown in Fig. 6.7 for different emissivities. [Pg.62]

Case A black solid lines) for three emissivities. The dashed gray lines refer to Iq = 30 W/mK (all other parameters being the same with Case A) [Pg.62]


See other pages where Impact of Surface Radiation is mentioned: [Pg.10]    [Pg.61]   


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