Effect of uneven wall heating conditions under different buoyancy numbers for a one side rib-roughened rotating channel

Wang, Zhi and Corral Garcia, Roque (2017). Effect of uneven wall heating conditions under different buoyancy numbers for a one side rib-roughened rotating channel. In: "ASME Turbo Expo 2017", 26-30 Jun 2017, Charlotte, North Carolina, USA. ISBN 978-0-7918-5087-9. pp.. https://doi.org/10.1115/GT2017-64574.

Description

Title: Effect of uneven wall heating conditions under different buoyancy numbers for a one side rib-roughened rotating channel
Author/s:
  • Wang, Zhi
  • Corral Garcia, Roque
Item Type: Presentation at Congress or Conference (Article)
Event Title: ASME Turbo Expo 2017
Event Dates: 26-30 Jun 2017
Event Location: Charlotte, North Carolina, USA
Title of Book: ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition
Título de Revista/Publicación: Journal of Turbomachinery-Transactions of the Asme
Date: 2017
ISBN: 978-0-7918-5087-9
ISSN: 0889-504X
Volume: 5A
Subjects:
Faculty: E.T.S. de Ingeniería Aeronáutica y del Espacio (UPM)
Department: Matemática Aplicada a la Ingeniería Aeroespacial
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

Abstract This paper investigates the impacts of uneven wall heating conditions under different Buoyancy numbers on flow field and heat transfer performance of a rotating channel with one side smooth and one side roughened by 45 degree inclined ribs. Parametric RANS simulations were conducted under two different wall heating conditions: only ribbed wall heated, as in experiment setup, and all walls heated, under three different Buoyancy numbers. Results are compared, when available, with experimental results. Abstract Numerical results show that uneven wall heating has only a minor impact on non-rotating cases and very low buoyancy rotating cases. However, it has a significant influence, on both, the heat transfer behaviour and the flow field, when the Buoyancy number is large. In the ribbed trailing rotating tests, the all walls heated cases show significantly higher heat transfer rate than only the ribbed wall heated cases. The discrepancy is enlarged as Buoyancy number increases. The heat transfer in the all walls heated case increases monotonically with the Buoyancy number whereas in the ribbed wall heated case is slight reduced. In the ribbed leading rotating tests, the heat transfer sensitivity to the heating conditions is not conspicuous, and for both cases, the heat transfer level slightly reduced as Buoyancy number increases. Abstract The flow field investigation shows that, there is a significant displacement of main flow in the all walls heated cases than only the ribbed wall heated cases under high Buoyancy numbers. This displacement is due to the buoyancy effect and responsible for the heat transfer differences in uneven heating problems. According to the results obtained in the paper, we conclude that when buoyancy effects are relevant, the heating settings can play a significant role in the heat transfer mechanisms and therefore in the experimental and numerical results.

Funding Projects

TypeCodeAcronymLeaderTitle
FP7233799ERICKAUnspecifiedEngine Representative Internal Cooling Knowledge and Applications

More information

Item ID: 45022
DC Identifier: http://oa.upm.es/45022/
OAI Identifier: oai:oa.upm.es:45022
DOI: 10.1115/GT2017-64574
Official URL: http://proceedings.asmedigitalcollection.asme.org/proceeding.aspx?articleid=2650077
Deposited by: Memoria Investigacion
Deposited on: 20 Feb 2018 13:14
Last Modified: 20 Feb 2018 13:14
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