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Microsystem Technologies

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16-02-2018 | Technical Paper

Evaluation of cold stripping process enhancement by twisted microchannels

Authors: Masoud Rahimi, Mohammad Hassan Almasvandi

Published in: Microsystem Technologies | Issue 8/2018

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Abstract

This paper reports a study on stripping enhancement in twisted microchannels with different geometries (twist ratio). As a case study, ammonia waste water–air stripping system was chosen for mass transport assessment in a cold stripping system. The experiments were carried out with three twisted microchannels. At the liquid superficial velocities in range of 0.005–0.17 ms⁻¹ and constant volumetric air to wastewater ratio, the flow patterns were compared in different twisted microchannels. Moreover, the effects of twist ratio on stripping efficiency and overall volumetric mass transfer coefficient were investigated. In order to evaluate the effects of twisting, the obtained results were compared with a simple microchannel. The results showed that the more twist ratio causes more efficient gas–liquid mass transfer. However, it is accompany with more need to energy for transferring fluids into a microchannel. The twist ratio had a direct effect on stripping efficiency and pressure drop. Twist creation in microchannels was proposed as a new design factor to improve the stripping process. In order to evaluate this parameter, a performance ratio was proposed. The results showed that the stripping efficiency and pressure drop increases with increase in twist ratio.

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Title: Evaluation of cold stripping process enhancement by twisted microchannels
Authors: Masoud Rahimi
Mohammad Hassan Almasvandi
Publication date: 16-02-2018
Publisher: Springer Berlin Heidelberg
Published in: Microsystem Technologies / Issue 8/2018
Print ISSN: 0946-7076
Electronic ISSN: 1432-1858
DOI: https://doi.org/10.1007/s00542-018-3796-3

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