Experimental investigations of liquid flow in pipe with flat internal baffles
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Jan Talaga
Abstract
Liquid flow in a tubular reactor with flat internal baffles of various widths was investigated. On the basis of the laser Doppler anemometry (LDA) measurements, the main flow parameters, i.e. the mean and fluctuating velocity components and turbulent kinetic energy (TKE) were determined. The investigations demonstrated that the insertion of baffles into a pipe and a change in their width caused a generation of liquid stream whirls, induced liquid recirculation loops and intensified the flow considerably. The results can be useful in describing turbulent flow in tubular reactors with baffles and in optimising their design.
Symbols
| a | distance between adjacent baffles | m |
| D | tube diameter | m |
| h | baffle width | m |
| k | turbulent kinetic energy (TKE) | m2 s–2 |
| N | number of data collected for each measurement point | |
| R | tube radius | m |
| Re | Reynolds number for empty pipe | |
| ui | instantaneous velocity component in i-th direction | m s–1 |
| ūx | axial component of mean velocity | m s–1 |
| ūx | radial component of mean velocity | m s–1 |
| u′x | fluctuation velocity in axial direction | m s–1 |
| u′x | fluctuation velocity in radial direction | m s–1 |
| wi | weighing factor for i-th componenl velocity of | s |
| σ | standard deviation | m s–1 |
| τres | residence time of seeding particles at measurement point | s |
References
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© 2015 Institute of Chemistry, Slovak Academy of Sciences
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