A further study of the effects of water vapor concentration on the rate of combustion of an artificial graphite in humid air flow |
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| Affiliation: | 1. Department of Life Science, Department of Energy Storage/Conversion Engineering (BK21 FOUR) of Graduate School, Hydrogen and Fuel Cell Research Center, Jeonbuk National University, Jeonju, Jeollabuk-do 54896, Republic of Korea;2. R&D Education Center for Whole Life Cycle R&D of Fuel Cell Systems, Jeonbuk National University, Jeonju, Jeollabuk-do 54896, Republic of Korea;3. Department of Energy Science and Engineering Research Center, Daegu Gyeongbuk Institute of Science & Technology (DGIST), Dalseong-Gun, Daegu 42988, Republic of Korea;4. Department of Biochemistry, Jeonbuk National University Medical School, Jeonju, Jeollabuk-do 54896, Republic of Korea;5. Department of Microbiology, Jeonbuk National University Medical School, Jeonju, Jeollabuk-do 54896, Republic of Korea;1. Department of Materials Science and Engineering, Centennial Campus, North Carolina State University, Raleigh, NC, 27695-7907, United States;2. Joint Department of Biomedical Engineering, Centennial Campus, North Carolina State University and UNC Chapel Hill, Raleigh, NC, 27695, United States;3. Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831-6100, United States |
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| Abstract: | Test specimes of graphite (disk-shaped, 10 mm in diameter and 1 mm in thickness) were burned in the stagnation region of an impinging oxidizer flow under atmospheric pressure; the velocity gradient of the impinging oxidizer flow was 100 s−1. The surface temperature of the test specimen was kept constant during each experimental run by an external heat source in a range of 1200–1700K. Three groups of oxidizers containing water vapor were used. The first group consists of humid air having six H2O concentrations (0.0681, 0.641, 3.13, 3.63, 5.15, 7.41 mol m−3 at 0.101 MPa and 320–339K); the second group, O2-recovered humid air having a fixed O2 concentration and five H2O concentrations equal to, respectively, the higher five of those for the aforementioned humid air; the third group, N2-enriched air having a fixed H2O concentration and five O2 concentrations equal to, respectively, the higher five O2 concentrations for the aforementioned humid air. The following results have been obtained. (1) When the water vapor concentration in the oxidizer flow is low, water vapor actively suppresses the combustion rate. (2) As the water vapor concentration exceeds a certain value, the effect of water vapor to suppress actively the combustion rate diminishes. (3) When the water vapor concentration is high, water vapor actively augments the combustion rate in the high surface temperature range. |
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