Effect of microstructures in microchannel for mixing intensification

Most of the passive rectangular micromixers designs utilizes the wide base of the channel to place the mixing enhancing structures for maximizing the mixing performance within the shortest distance possible. High pressure drop due to the very low channel dimensions, passive mixing structures and the...

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Main Authors:	W.M. Ling, Fiona, Ali, A. Khleif, T. Heng, J., Hayder, A. Abdubari
Format:	Conference or Workshop Item
Language:	English English
Published:	Universiti Malaysia Pahang 2019
Subjects:	TA Engineering (General). Civil engineering (General)
Online Access:	http://umpir.ump.edu.my/id/eprint/26082/ http://umpir.ump.edu.my/id/eprint/26082/1/77.%20Effect%20of%20microstructures%20in%20microchannel%20for%20mixing%20intensification.pdf http://umpir.ump.edu.my/id/eprint/26082/2/77.1%20Effect%20of%20microstructures%20in%20microchannel%20for%20mixing%20intensification.pdf

id	ump-26082
recordtype	eprints
spelling	ump-260822019-10-18T04:14:52Z http://umpir.ump.edu.my/id/eprint/26082/ Effect of microstructures in microchannel for mixing intensification W.M. Ling, Fiona Ali, A. Khleif T. Heng, J. Hayder, A. Abdubari TA Engineering (General). Civil engineering (General) Most of the passive rectangular micromixers designs utilizes the wide base of the channel to place the mixing enhancing structures for maximizing the mixing performance within the shortest distance possible. High pressure drop due to the very low channel dimensions, passive mixing structures and the domination of the liquid apparent physical properties like viscosity, is considered a serious drawback that limits the expected future improvement in the mixing performance. In the present work, microriblets (V-shaped) with the size ranging from 20 to 100 µm are designed, fabricated and placed at the narrow side-walls of the rectangular micomixer to test its flow enhancement and mixing performances. The micromixers were fabricated through direct writing method where polymethyldisiloxane was used as the substrate. The flow behavior of single and multiphase flow systems was investigated through monitoring the flow rate of the fluids flowing through the system. The flow profile in the system was evaluated using micro-particle velocimetry (µ-PIV). The results indicated a flow enhancement up to ~29% for a 60 µm of base-to-height riblet at an operating pressure of ~200 mbar for a single-phase flow system. Larger microriblets were found to produce a thicker laminar sub-layer within the devices that narrowed the active core of the solution. When a two-phase flow system is introduced, the flow enhancement was clearly observed in the water phase at operating pressure > 600 mbar and riblets dimension > 60 µm. On the other hand, the mixing performance was intensified at the non-flow-enhancement pressure range which led to the conclusion that within the investigated operating conditions, high mixing performance cannot occur at the same time as the flow enhancement. Universiti Malaysia Pahang 2019 Conference or Workshop Item PeerReviewed pdf en http://umpir.ump.edu.my/id/eprint/26082/1/77.%20Effect%20of%20microstructures%20in%20microchannel%20for%20mixing%20intensification.pdf pdf en http://umpir.ump.edu.my/id/eprint/26082/2/77.1%20Effect%20of%20microstructures%20in%20microchannel%20for%20mixing%20intensification.pdf W.M. Ling, Fiona and Ali, A. Khleif and T. Heng, J. and Hayder, A. Abdubari (2019) Effect of microstructures in microchannel for mixing intensification. In: Energy Security and Chemical Engineering Congress (ESCHE2019), 17-19 Julai 2019 , Parkroyal Resort Penang, Malaysia. pp. 1-18.. (Unpublished)
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Malaysia Pahang
building	UMP Institutional Repository
collection	Online Access
language	English English
topic	TA Engineering (General). Civil engineering (General)
spellingShingle	TA Engineering (General). Civil engineering (General) W.M. Ling, Fiona Ali, A. Khleif T. Heng, J. Hayder, A. Abdubari Effect of microstructures in microchannel for mixing intensification
description	Most of the passive rectangular micromixers designs utilizes the wide base of the channel to place the mixing enhancing structures for maximizing the mixing performance within the shortest distance possible. High pressure drop due to the very low channel dimensions, passive mixing structures and the domination of the liquid apparent physical properties like viscosity, is considered a serious drawback that limits the expected future improvement in the mixing performance. In the present work, microriblets (V-shaped) with the size ranging from 20 to 100 µm are designed, fabricated and placed at the narrow side-walls of the rectangular micomixer to test its flow enhancement and mixing performances. The micromixers were fabricated through direct writing method where polymethyldisiloxane was used as the substrate. The flow behavior of single and multiphase flow systems was investigated through monitoring the flow rate of the fluids flowing through the system. The flow profile in the system was evaluated using micro-particle velocimetry (µ-PIV). The results indicated a flow enhancement up to ~29% for a 60 µm of base-to-height riblet at an operating pressure of ~200 mbar for a single-phase flow system. Larger microriblets were found to produce a thicker laminar sub-layer within the devices that narrowed the active core of the solution. When a two-phase flow system is introduced, the flow enhancement was clearly observed in the water phase at operating pressure > 600 mbar and riblets dimension > 60 µm. On the other hand, the mixing performance was intensified at the non-flow-enhancement pressure range which led to the conclusion that within the investigated operating conditions, high mixing performance cannot occur at the same time as the flow enhancement.
format	Conference or Workshop Item
author	W.M. Ling, Fiona Ali, A. Khleif T. Heng, J. Hayder, A. Abdubari
author_facet	W.M. Ling, Fiona Ali, A. Khleif T. Heng, J. Hayder, A. Abdubari
author_sort	W.M. Ling, Fiona
title	Effect of microstructures in microchannel for mixing intensification
title_short	Effect of microstructures in microchannel for mixing intensification
title_full	Effect of microstructures in microchannel for mixing intensification
title_fullStr	Effect of microstructures in microchannel for mixing intensification
title_full_unstemmed	Effect of microstructures in microchannel for mixing intensification
title_sort	effect of microstructures in microchannel for mixing intensification
publisher	Universiti Malaysia Pahang
publishDate	2019
url	http://umpir.ump.edu.my/id/eprint/26082/ http://umpir.ump.edu.my/id/eprint/26082/1/77.%20Effect%20of%20microstructures%20in%20microchannel%20for%20mixing%20intensification.pdf http://umpir.ump.edu.my/id/eprint/26082/2/77.1%20Effect%20of%20microstructures%20in%20microchannel%20for%20mixing%20intensification.pdf
first_indexed	2023-09-18T22:40:24Z
last_indexed	2023-09-18T22:40:24Z
_version_	1777416876058476544

Effect of microstructures in microchannel for mixing intensification

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