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The reduction of pressure losses in thermally modulated vertical channels


Floryan, JM and Wang, W and Bassom, AP, The reduction of pressure losses in thermally modulated vertical channels, Journal of Fluid Mechanics, 954, (38) pp. 1-32. ISSN 1469-7645 (2023) [Refereed Article]

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Copyright Statement

The Author(s), 2023. Published by Cambridge University Press. This is an open access article under the terms of the Creative Commons Attribution 4.0 International (CC BY 4.0) License, ( which permits unrestricted re-use, distribution and reproduction, provided the original article is properly cited.

DOI: doi:10.1017/jfm.2022.1027


The role played by patterned heating in reducing pressure losses within vertical conduits is investigated. The heating generates flow separation structures which reduce the direct contact between the stream and the sidewalls, thereby limiting the frictional resistance. This also modifies the temperature field thereby inducing a net buoyancy force which may either assist or oppose the pressure gradient required to maintain a fixed flow rate. If the flow Reynolds number is increased sufficiently, the separation structures may be washed away, which means that the pressure-gradient-reducing mechanism is eliminated. The details of the system response are a function of the form of spatial heating distribution, its intensity, the flow Reynolds number and the fluid Prandtl number. Carefully chosen heating of the two walls can induce a pattern interaction effect and a judicious choice of the two patterns can have as much as an order of magnitude effect on the system response.

Item Details

Item Type:Refereed Article
Keywords:eduction of pressure losses, flow control, natural convection, structured convection
Research Division:Mathematical Sciences
Research Group:Applied mathematics
Research Field:Theoretical and applied mechanics
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the mathematical sciences
UTAS Author:Bassom, AP (Professor Andrew Bassom)
ID Code:154914
Year Published:2023
Deposited By:Mathematics
Deposited On:2023-01-18
Last Modified:2023-02-09

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