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HEAT TRANSFER BEHAVIOUR IN A TWO-PHASE BUBBLE COLUMN | ||
| Al-Qadisiyah Journal for Engineering Sciences | ||
| Article 34, Volume 2, Issue 2, 2009, Pages 425-438 PDF (0 K) | ||
| Authors | ||
| Balasim A. Abid; Dr. Rahman Sh. Abdulmohsin; Mr. Hisham M. Al.Tamimi | ||
| Abstract | ||
| Time-averaged local heat transfer coefficient profiles were studied in a 0.2 m bubble column diameter using air-water system. The effects of the superficial gas velocity and axial locations (Z/D) on the heat transfer coefficient and its radial (r/R) profiles were investigated in bubble column. Significant differences were observed between heat transfer 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 15% -23% for increasing the superficial gas velocity from 0.03-0.35 m/s. The heat transfer coefficient increase with superficial gas velocities and the values in the center of the column were 8–12% greater than those near the wall region .The characteristics of bulk flow region have large variation in radial direction and little in axial direction for the values of heat transfer coefficients. | ||
| Keywords | ||
| bubble columns; large; scale; Heat transfer coefficient; axial location; radial profile | ||
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