The effect of heat exchanging internals on the heat-transfer
coefficient has been investigated in a 0.19 m diameter bubble column.
An air–water system was used with superficial gas velocities
varying from 3 to 20 cm/s, which cover both the bubbly and churn-turbulent
flow regimes. Internals occluding 0% (empty column), 5% (simulating
methanol synthesis), and 22% (simulating Fischer–Tropsch synthesis)
of the column cross-sectional area were implemented. A fast response
heat-transfer probe was utilized to measure the radial profile
of the heat-transfer coefficient in the fully developed flow region.
The results indicate that the presence of a high percentage of internals
causes an increase in the heat-transfer coefficient at the same actual
gas velocity on the basis of the open cross-sectional area. Also,
the heat-transfer coefficient increases with an increase in the gas
velocity. The heat-transfer coefficients in the column center for
all of the studied conditions are larger than those near the wall
of the column.
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