Hydrodynamics and liquid phase axial mixing in orifice pipe reactor

Lali, A. M. ; Khare, A. S. ; Joshi, J. B. ; Eapen, A. C. ; Rao, S. M. ; Yelgaonkar, V. N. ; Ajmera, R. L. (1988) Hydrodynamics and liquid phase axial mixing in orifice pipe reactor The Canadian Journal of Chemical Engineering, 66 (2). pp. 182-191. ISSN 0008-4034

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Official URL: http://onlinelibrary.wiley.com/doi/10.1002/cjce.54...

Related URL: http://dx.doi.org/10.1002/cjce.5450660202


Two phase flow in a horizontal pipe, with orifice plates placed at regular intervals as obstructions, was studied for the effect of phase velocities on flow patterns, fractional phase hold-ups, pressure drop and liquid phase axial dispersion. Radioactive technetium-99m (as an aqueous solution of sodium pertechnatate) was used as tracer. A pulse injection technique with two point measurements was employed. Three different orifice diameters were used (8 mm, 16 mm, and 20 mm) in a pipe diameter of 32 mm. The orifice spacing was 500 mm in all cases. Superficial gas (air) velocity was varied over a range from 0.02 m/s to 1.0 m/s and superficial liquid (water) velocity from 0.03 m/s to 0.85 m/s. Different flow patterns under different flow conditions were identified and a generalised flow map is presented. Variations in hold-ups and pressure drop with flow patterns have been explained. Rational correlations have been developed for fractional phase hold-ups and pressure drop. A preliminary comparison of two phase gas-liquid flow in a horizontal pipe with orifice obstructions (to be called orifice pipe reactor), as a gas-liquid contacting device, is made with a conventional bubble column reactor. Recommendations have been made for future work.

Item Type:Article
Source:Copyright of this article belongs to John Wiley and Sons.
Keywords:Gas-liquid Pressure Drop; Orifice Flow Maps; Two-phase Holdups; Axial Dispersion
ID Code:61101
Deposited On:13 Sep 2011 06:52
Last Modified:13 Sep 2011 06:52

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