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Local impact of roughness topography on heat transfer in turbulent flow over rough surfaces

Garg, H. LU orcid ; Klingmann, J. LU ; Nogenmyr, K. ; Marin, A. P. ; Stroh, A. and Kuwata, Y. (2025) 11th International Symposium on Turbulence, Heat and Mass Transfer, THMT 2025 In Proceedings of the International Symposium on Turbulence, Heat and Mass Transfer
Abstract

Additive manufacturing (AM), particularly Laser Powder Bed Fusion, produces surfaces with unique, randomly distributed spherical roughness that significantly influences heat transfer and pressure loss. This study models AM roughness using a statistical distribution of spheres and performs high-fidelity simulations at a bulk Reynolds number of 12,000 to evaluate heat transfer on a rough pipe. Statistical measures were deployed to highlight a clear correlation between roughness height and heat transfer. By analyzing probability density functions of roughness height and the normalized local Nusselt number, along with their conditional and joint distributions, the study demonstrates that local heat transfer enhancement is strongly dependent... (More)

Additive manufacturing (AM), particularly Laser Powder Bed Fusion, produces surfaces with unique, randomly distributed spherical roughness that significantly influences heat transfer and pressure loss. This study models AM roughness using a statistical distribution of spheres and performs high-fidelity simulations at a bulk Reynolds number of 12,000 to evaluate heat transfer on a rough pipe. Statistical measures were deployed to highlight a clear correlation between roughness height and heat transfer. By analyzing probability density functions of roughness height and the normalized local Nusselt number, along with their conditional and joint distributions, the study demonstrates that local heat transfer enhancement is strongly dependent on roughness height and it’s distribution. Specifically, elevated roughness elements correlate with increased heat transfer due to enhanced turbulence and flow disruption, whereas smaller or sheltered roughness elements contribute minimally.

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Please use this url to cite or link to this publication:
author
; ; ; ; and
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
host publication
THMT-25 Turbulence, Heat and Mass Transfer
series title
Proceedings of the International Symposium on Turbulence, Heat and Mass Transfer
publisher
Begell House
conference name
11th International Symposium on Turbulence, Heat and Mass Transfer, THMT 2025
conference location
Tokyo, Japan
conference dates
2025-07-21 - 2025-07-25
external identifiers
  • scopus:105023979262
ISSN
2377-2816
ISBN
9781567005530
DOI
10.1615/THMT-25.1230
language
English
LU publication?
yes
id
df6e6c92-0266-4051-8803-2714255953b1
date added to LUP
2025-12-14 11:10:19
date last changed
2025-12-16 13:18:47
@inproceedings{df6e6c92-0266-4051-8803-2714255953b1,
  abstract     = {{<p>Additive manufacturing (AM), particularly Laser Powder Bed Fusion, produces surfaces with unique, randomly distributed spherical roughness that significantly influences heat transfer and pressure loss. This study models AM roughness using a statistical distribution of spheres and performs high-fidelity simulations at a bulk Reynolds number of 12,000 to evaluate heat transfer on a rough pipe. Statistical measures were deployed to highlight a clear correlation between roughness height and heat transfer. By analyzing probability density functions of roughness height and the normalized local Nusselt number, along with their conditional and joint distributions, the study demonstrates that local heat transfer enhancement is strongly dependent on roughness height and it’s distribution. Specifically, elevated roughness elements correlate with increased heat transfer due to enhanced turbulence and flow disruption, whereas smaller or sheltered roughness elements contribute minimally.</p>}},
  author       = {{Garg, H. and Klingmann, J. and Nogenmyr, K. and Marin, A. P. and Stroh, A. and Kuwata, Y.}},
  booktitle    = {{THMT-25 Turbulence, Heat and Mass Transfer}},
  isbn         = {{9781567005530}},
  issn         = {{2377-2816}},
  language     = {{eng}},
  publisher    = {{Begell House}},
  series       = {{Proceedings of the International Symposium on Turbulence, Heat and Mass Transfer}},
  title        = {{Local impact of roughness topography on heat transfer in turbulent flow over rough surfaces}},
  url          = {{http://dx.doi.org/10.1615/THMT-25.1230}},
  doi          = {{10.1615/THMT-25.1230}},
  year         = {{2025}},
}