An experimental study of heat transfer in the turn region of a U-bend channel with various ribs

Chenglong Wang, Lei Wang, Bengt Sundén

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceedingpeer-review

Abstract

The detailed heat transfer distributions and pressure drop in the turn region of a U-bend channel with and without ribs have been experimentally investigated using liquid crystal thermography. The Reynolds numbers based on hydraulic diameter of the channel and the bulk velocity are 20,000 and 26,000. The ribs are mounted on the outer wall surface in the turn region of the U-bend channel; the rib height-to-hydraulic diameter ratio is 6%; the rib pitch-to-height ratio is 12; and the rib configurations studied are transverse (90°), angled (45°, 60°), and V-shaped (45°, 60°) with tip facing downstream and upstream. Results indicate that heat transfer on the smooth outer wall is dominated by the flow impingement. In the presence of ribs, the heat transfer patterns are significantly altered due to the combined effects of the sharp turn and ribs. Based on the average heat transfer and pressure drop, thermal performance is evaluated and heat transfer non-uniformity is also considered to provide better rib configurations.

Original languageEnglish
Title of host publicationProceedings of the 15th International Heat Transfer Conference, IHTC 2014
PublisherBegell House
Publication statusPublished - 2014
Event15th International Heat Transfer Conference, IHTC 2014 - Kyoto, Japan
Duration: 2014 Aug 102014 Aug 15

Conference

Conference15th International Heat Transfer Conference, IHTC 2014
Country/TerritoryJapan
CityKyoto
Period2014/08/102014/08/15

Subject classification (UKÄ)

  • Energy Engineering

Free keywords

  • Blade-tip cooling
  • Gas turbine
  • Heat transfer enhancement
  • Liquid crystal thermography
  • U-bend channel

Fingerprint

Dive into the research topics of 'An experimental study of heat transfer in the turn region of a U-bend channel with various ribs'. Together they form a unique fingerprint.

Cite this