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Heat transfer and pressure drop in a smooth and ribbed turn region of a two-pass channel

In English

Författare

Summary, in English

In the present study, the heat transfer and pressure drop in the turn region of a two-pass channel have been investigated experimentally. The liquid crystal thermography method is utilized to measure local heat transfer rates. Eight cases were tested, including one smooth, and seven different rib-roughened turn surfaces. The tested Reynolds numbers are 20,000 and 26,000, respectively. Results indicate that the heat transfer on the smooth outer wall is dominated by the flow impingement. When ribs are fitted onto the outer wall, the heat transfer patterns are significantly altered. However, the presence of ribs augments the heat transfer at the penalty of increased heat transfer non-uniformity and pressure loss. In order to provide optimized rib configurations, the thermal performance is evaluated, which balances the enhanced heat transfer and increased pressure loss. The results can be used for the development of cooling techniques in gas turbines and validation of numerical simulations.

Avdelning/ar

Publiceringsår

2015

Språk

Engelska

Sidor

225-233

Publikation/Tidskrift/Serie

Applied Thermal Engineering

Volym

85

Dokumenttyp

Artikel i tidskrift

Förlag

Elsevier

Ämne

  • Energy Engineering

Nyckelord

  • Heat transfer enhancement
  • Blade-tip cooling
  • Two-pass channel
  • Liquid
  • crystal thermography

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 1359-4311