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Effect of microstructures in microchannel for single phase flow mixing intensification

Ling, Fiona W. M. and Khleif, Ali A. and Abdulbari, Hayder A. (2020) Effect of microstructures in microchannel for single phase flow mixing intensification. In: IOP Conference Series: Materials Science and Engineering, Energy Security and Chemical Engineering Congress, 17-19 July 2019 , Kuala Lumpur, Malaysia. pp. 1-17., 736 (022032). ISSN 1757-8981 (Print), 1757-899X (Online)

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Enhancing flow in microchannel is a serious fundamental challenge due to the laminar flow nature of the liquids in the microscale systems that prevents the traditional viscoelastic additives from interacting with the turbulence structures (eddies) for an effective drag reduction performance. Passive drag reduction technique is believed to be a promising solution and never been investigated in the microflow systems before. In this work, micro- riblets (V-shaped) with the size ranging from 20 to 100 μm were designed, fabricated, and placed at the narrow side-walls of the rectangular microchannel in an attempt to test its flow enhancement performances. The microchannels were fabricated through a direct writing method where polymethyldisiloxane was used as the substrate. The flow behavior 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 micro-riblets were found to produce a thicker laminar sublayer within the devices that narrowed the active core of the solution.

Item Type: Conference or Workshop Item (Lecture)
Additional Information: Indexed by Scopus
Uncontrolled Keywords: Shark skin; Fluids flow; Microflow systems
Subjects: T Technology > TP Chemical technology
Faculty/Division: Centre of Excellence: Centre of Excellence for Advanced Research in Fluid Flow
Faculty of Chemical & Natural Resources Engineering
Institute of Postgraduate Studies
Depositing User: Mrs Norsaini Abdul Samat
Date Deposited: 28 Apr 2021 04:30
Last Modified: 28 Apr 2021 04:30
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