Experimental evaluation of hydrodynamics and tube-to-bed heat transfer of fluidized Ilmenite ore particles at elevated pressures
| Autor: | Dennis Y. Lu, C.J. McIntyre, Poupak Mehrani, Scott Champagne, Robert T. Symonds, Arturo Macchi |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
General Chemical Engineering Bubble Thermodynamics 02 engineering and technology Heat transfer coefficient engineering.material 021001 nanoscience & nanotechnology 020401 chemical engineering Heat transfer engineering Curve fitting Tube (fluid conveyance) Fluidization 0204 chemical engineering 0210 nano-technology Constant (mathematics) Ilmenite |
| Zdroj: | Powder Technology. 376:697-707 |
| ISSN: | 0032-5910 |
| DOI: | 10.1016/j.powtec.2020.08.062 |
| Popis: | The minimum fluidization velocity (Umf), bubble size characteristics, and tube-to-bed heat transfer coefficient (hc) of ilmenite particles are investigated at pressures up to 2000 kPa. The Umf was found to decrease with pressure for dsv ≥ 236 μm and remain constant for dsv ≤ 109 μm. Umf was compared to various Wen and Yu type correlations ( R e mf = C 1 2 + C 2 Ar − C 1 ) with the Saxena & Vogel (1977) constants resulting in the best fit (AARD = 10.5%) for dsv ≤ 109 μm and the Chitester et al. (1984) constants resulting in the best fit (AARD = 6.4%) for dsv ≥ 236 μm. Pressure marginally effected bubble size relative to gas velocity, with the data fitting the Mori & Wen (1975) correlation best (AARD = 26.4%). The tube-to-bed heat transfer coefficient experienced a maximum with increasing gas velocity and marginally increased with pressure. The Molerus et al. (1995) correlation matched the atmospheric heat transfer data. |
| Databáze: | OpenAIRE |
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