Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/136868
Title: Heat transfer enhancement through periodic flow area variations in microchannels
Authors: Cheng, Kai Xian
Foo, Zi Hao
Ooi, Kim Tiow
Keywords: Engineering::Mechanical engineering
Issue Date: 2020
Source: Cheng, K. X., Foo, Z. H., & Ooi, K. T. (2020). Heat transfer enhancement through periodic flow area variations in microchannels. International Communications in Heat and Mass Transfer, 111104456-. doi:10.1016/j.icheatmasstransfer.2019.104456
Journal: International Communications in Heat and Mass Transfer
Abstract: In this study, annular microchannels with a microscale gap of 300 μm were implemented through the concentric superposition of two macro-sized cylinders. Flow area variations along the streamwise direction were created by introducing sinusoidal wave profiles on either the inner or outer wall of the annular gap while keeping the other wall flat. These variations introduced re-entrant effects along the flow direction. Numerical studies using the finite volume method were performed to elucidate the single-phase, steady-state thermal and hydrodynamic performances of the wavy channels, using water as the fluid medium, with an operating Reynolds number range of 800–2200. The predicted results were validated using the available measured data and classical correlations. This study demonstrated the viability of attaining enhanced heat transfer rates of up to 360% of the original straight channel through the inducement of flow area variations with single wavy-walled channels. Despite magnifications of the friction factors, the single wavy-walled channels attained a 120% increment in heat transfer coefficient when evaluated at the same pumping power. Overall, single-walled wavy passages were deemed suitable for heat exchanger designs demanding very high heat removal rates and efficiencies while the conventional serpentine channels were apt for moderately enhancing heat transfer while requiring low pumping power.
URI: https://hdl.handle.net/10356/136868
ISSN: 0735-1933
DOI: 10.1016/j.icheatmasstransfer.2019.104456
Rights: © 2020 Elsevier. All rights reserved. This paper was published in International Communications in Heat and Mass Transfer and is made available with permission of Elsevier.
Fulltext Permission: embargo_20221231
Fulltext Availability: With Fulltext
Appears in Collections:MAE Journal Articles

Files in This Item:
File Description SizeFormat 
Heat transfer enhancement through periodic flow area variations in microchannels - Cheng 2020.pdf
  Until 2022-12-31
Final Draft - Post Refereeing1.02 MBAdobe PDFUnder embargo until Dec 31, 2022

SCOPUSTM   
Citations 20

13
Updated on Oct 3, 2022

Web of ScienceTM
Citations 20

10
Updated on Oct 2, 2022

Page view(s)

140
Updated on Oct 6, 2022

Download(s) 50

25
Updated on Oct 6, 2022

Google ScholarTM

Check

Altmetric


Plumx

Items in DR-NTU are protected by copyright, with all rights reserved, unless otherwise indicated.