Fully-developed Convective Heat Transfer and Pressure Drop in a Square Duct with Baffle Inserts using CFD Analysis

Lasse Uhd Christensen, Stefan Holebæk*, Nisanthan Thanabalasingham, Jakob Hærvig, Henrik Sørensen

*Corresponding author for this work

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Abstract

The scope of this project is to investigate how the geometry of baffles affect heat transfer and pressure loss of a fluid flow at Re = 1000 through a square duct. For this purpose, Large Eddy Simulations are performed to investigate the effect of baffle height and baffle width. Focus is on the fully-developed flow that repeats itself at streamwise stations. The flow field predicted by Computational Fluid Dynamics simulations was validated using Particle Image Velocimetry.

The different designs are evaluated in terms of Nusselt number, Nu and a loss coefficient, f, which are normalised using a reference geometry consisting of a square duct without baffles. The two parameters are additionally combined into a performance parameter eta η = (Nu/Nu0)/(f / f0)(1/3).

It was found that adding baffles can result in a quadrupling of η. Reducing the height of baffles decreases heat transfer, while significantly reducing pressure loss and ultimately leading to a higher η. Reducing baffle height was also found to increase the temperature gradient at the upper wall and reduce it at the lower wall. Reducing baffle width resulted in the largest temperature gradient, but lead to poor heat transfer within the fluid.
Original languageEnglish
Title of host publicationProceedings of the ASME 2020 18th International Conference on Nanochannels, Microchannels and Minichannels
Number of pages10
Publication date12 Oct 2020
Pages1-10
Article numberICNMM2020-1066, V001T11A001
ISBN (Print)978-0-7918-8369-3
DOIs
Publication statusPublished - 12 Oct 2020
EventASME 2020 18th International Conference on Nanochannels, Microchannels and Minichannels -
Duration: 12 Jul 202015 Sep 2020

Conference

ConferenceASME 2020 18th International Conference on Nanochannels, Microchannels and Minichannels
Period12/07/202015/09/2020

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