Measurements of mass transfer coefficient and effectiveness in the recovery region of a film-cooled surface

W. P. Webster, S. Yavuzkurt

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Mass transfer coefficients and film cooling effectiveness are measured downstream of a single row of holes (recovery region) inclined 30° with the surface and inline with the main turbulent boundary layer flow. The mass transfer coefficients are measured using a naphthalene sublimation technique. The effectiveness is determined through the injection of a trace gas into the secondary flow and measuring its concentration at the impermeable wall. Experiments are carried out in a subsonic, zero pressure gradient turbulent boundary layer, under isothermal conditions with three blowing ratios (Uj/U): 0.4, 0.8, and 1.2. The data is collected in a region 7-80 jet diameters downstream of the injection location. From the data on mass transfer coefficients and effectiveness obtained under the same flow conditions a general mass transfer equation is derived. This paper presents extensive data and discussions; and is believed to be one of the few studies in which both of these variables are measured on the same surface and in a large area in the recovery region.

Original languageEnglish (US)
Pages (from-to)781-789
Number of pages9
JournalInternational Journal of Heat and Mass Transfer
Volume30
Issue number4
DOIs
StatePublished - Apr 1987

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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