Heat transfer on internal surfaces of a duct subjected to impingement of a jet array with varying jet hole-size and spacing

U. Uysal, P. W. Li, M. K. Chyu, F. J. Cunha

Research output: Contribution to conferencePaper

6 Scopus citations

Abstract

One significant issue concerning the impingement heat transfer with a jet array is related to the so-called "crossflow", where a local jet performance is influenced by the convection of the confluence from the impingement of the jet/jets placed upstream. As a result, the heat transfer coefficient may vary along the streamwise direction and creates more or less non-uniform cooling over the component, which is undesirable from both the performance and durability standpoints. Described in this paper is an experimental investigation of the heat transfer coefficient on surfaces impinged by an array of six inline circular jets with their diameters increased monotically along the streamwise direction. The local heat transfer distributions on both the target surface and jet-issuing plate are measured using a transient liquid crystal technique. By varying the jet hole-size in a systematic manner, the actual distribution of jet flow rate and momentum within a jet array may be optimally metered and controlled against crossflow. The effects on the heat transfer coefficient distribution due to variations of jet-to-target distance and inter-jet spacing are investigated. The varying-diameter results are compared with those from a corresponding array of uniform jet diameter.

Original languageEnglish (US)
Pages141-150
Number of pages10
DOIs
StatePublished - Nov 23 2005
Externally publishedYes
EventASME Turbo Expo 2005 - Gas Turbie Technology: Focus for the Future - Reno-Tahoe, NV, United States
Duration: Jun 6 2005Jun 9 2005

Other

OtherASME Turbo Expo 2005 - Gas Turbie Technology: Focus for the Future
CountryUnited States
CityReno-Tahoe, NV
Period6/6/056/9/05

ASJC Scopus subject areas

  • Engineering(all)

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    Uysal, U., Li, P. W., Chyu, M. K., & Cunha, F. J. (2005). Heat transfer on internal surfaces of a duct subjected to impingement of a jet array with varying jet hole-size and spacing. 141-150. Paper presented at ASME Turbo Expo 2005 - Gas Turbie Technology: Focus for the Future, Reno-Tahoe, NV, United States. https://doi.org/10.1115/GT2005-68106