Experimental study of surface roughness effect on oxygen catalytic recombination
| Autor: | Ikhyun Kim, Gisu Park, Jae Jeong Na |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Fluid Flow and Transfer Processes
Materials science Argon Silicon dioxide Mechanical Engineering chemistry.chemical_element 02 engineering and technology Surface finish 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Oxygen 010305 fluids & plasmas Catalysis chemistry.chemical_compound chemistry Volume (thermodynamics) 0103 physical sciences Surface roughness Composite material 0210 nano-technology Shock tube |
| Zdroj: | International Journal of Heat and Mass Transfer. 138:916-922 |
| ISSN: | 0017-9310 |
| DOI: | 10.1016/j.ijheatmasstransfer.2019.04.049 |
| Popis: | The effect of surface roughness on a catalytic phenomenon has been experimentally investigated. The test gas considered was a mixture of 21% oxygen and 79% argon by volume. The surface heat-transfer rate at the shock tube end wall was measured using a thin-film gauge. The surface of the test model was coated with silicon dioxide. Three different levels of surface roughness of the test model were prepared. Prior to testing, the surface roughness of the test samples was determined using atomic force microscopy, thus characterizing the initial condition. The heat-transfer rates of the rough surfaces were approximately 11% to 25% higher than those of the smooth walls, where the root-mean-square roughness of the rough walls were higher than those of the smooth walls approximately by a factor of 2–6.5. The oxygen catalytic recombination efficiency was determined by evaluating the measured heat-transfer rates and by the existing theory based on binary gas mixtures. It was found that with the increase in the level of surface roughness, the catalytic activity at the surface is increased. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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