Heat Transfer Characteristics in a Large-Scale Bubble Column Operating in a Semi – Batch Mode
Time-averaged local heat transfer coefficient profiles were studied in a 0.45m bubble column using air-water system. The effect of the superficial gas velocity andaxial locations (Z/D) on the heat transfer coefficient and its radial (r/R) profiles wereinvestigated in bubble column. Significant diffe...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Unviversity of Technology- Iraq
2010-01-01
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| Series: | Engineering and Technology Journal |
| Subjects: | |
| Online Access: | https://etj.uotechnology.edu.iq/article_26979_b0f4870b875ccd7cd888c8e45ab1a6e5.pdf |
| Summary: | Time-averaged local heat transfer coefficient profiles were studied in a 0.45m bubble column using air-water system. The effect of the superficial gas velocity andaxial locations (Z/D) on the heat transfer coefficient and its radial (r/R) profiles wereinvestigated in bubble column. Significant differences were observed between heattransfer coefficients in the axial directions viz. in the bulk flow region (Z/D=4.8)higher than in the distributor region (Z/D=0.28) by 14% -22% for increasing thesuperficial gas velocity from 0.05-0.45 m/s. The heat transfer coefficients increasewith superficial gas velocities and the values in the center of the column were 9–13%greater than those near the wall region .The characteristics of bulk flow region arelarge variation in radial direction and little in axial direction for the values of heattransfer coefficients. |
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| ISSN: | 1681-6900 2412-0758 |