Forced convection heat transfer enhancement using a self-oscillating impinging planar jet

Cengiz Camci, Frank Herr

Research output: Contribution to journalArticle

79 Citations (Scopus)

Abstract

Impinging jets are widely used in the local enhancement of heat removed from internal passages of gas turbine blades. Arrays of stationary jets are usually impinged on surfaces of internal cooling passages. The current practice is to benefit from the high heat transfer coefficients existing in the vicinity of the jet impingement region on a target wall. The present study shows that a self-oscillating impinging-jet configuration is extremely beneficial in enhancing the heat removal performance of a conventional (stationary) impinging jet. In addition to a highly elevated stagnation line Nusselt number, the area coverage of the impingement zone is significantly enhanced because of the inherent sweeping motion of the oscillating coolant jet. When an oscillating jet (Re=14,000) is impinged on a plate normal to the jet axis (x/d=24 hole to plate distance), a typical enhancement of Nu number on the stagnation line is about 70 percent. The present paper explains detailed fluid dynamics structure of the self-oscillating jet by using a triple decomposition technique on a crossed hot wire signal. The current heat transfer enhancement levels achieved suggest that it may be possible to implement the present self-oscillating-impinging-jet concept in future gas turbine cooling systems, on rotating disks, glass tempering/ quenching, electronic equipment cooling, aircraft de-icing, combustors and heat exchangers.

Original languageEnglish (US)
Pages (from-to)770-782
Number of pages13
JournalJournal of Heat Transfer
Volume124
Issue number4
DOIs
StatePublished - Aug 1 2002

Fingerprint

forced convection
Forced convection
heat transfer
Heat transfer
augmentation
exchangers
gas turbines
Snow and ice removal
Gas turbines
jet impingement
cooling
electronic equipment
heat
ice formation
Cooling
turbine blades
tempering
impingement
cooling systems
rotating disks

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

@article{99943dd28ab84b24a3a94d6f1aec4500,
title = "Forced convection heat transfer enhancement using a self-oscillating impinging planar jet",
abstract = "Impinging jets are widely used in the local enhancement of heat removed from internal passages of gas turbine blades. Arrays of stationary jets are usually impinged on surfaces of internal cooling passages. The current practice is to benefit from the high heat transfer coefficients existing in the vicinity of the jet impingement region on a target wall. The present study shows that a self-oscillating impinging-jet configuration is extremely beneficial in enhancing the heat removal performance of a conventional (stationary) impinging jet. In addition to a highly elevated stagnation line Nusselt number, the area coverage of the impingement zone is significantly enhanced because of the inherent sweeping motion of the oscillating coolant jet. When an oscillating jet (Re=14,000) is impinged on a plate normal to the jet axis (x/d=24 hole to plate distance), a typical enhancement of Nu number on the stagnation line is about 70 percent. The present paper explains detailed fluid dynamics structure of the self-oscillating jet by using a triple decomposition technique on a crossed hot wire signal. The current heat transfer enhancement levels achieved suggest that it may be possible to implement the present self-oscillating-impinging-jet concept in future gas turbine cooling systems, on rotating disks, glass tempering/ quenching, electronic equipment cooling, aircraft de-icing, combustors and heat exchangers.",
author = "Cengiz Camci and Frank Herr",
year = "2002",
month = "8",
day = "1",
doi = "10.1115/1.1471521",
language = "English (US)",
volume = "124",
pages = "770--782",
journal = "Journal of Heat Transfer",
issn = "0022-1481",
publisher = "American Society of Mechanical Engineers(ASME)",
number = "4",

}

Forced convection heat transfer enhancement using a self-oscillating impinging planar jet. / Camci, Cengiz; Herr, Frank.

In: Journal of Heat Transfer, Vol. 124, No. 4, 01.08.2002, p. 770-782.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Forced convection heat transfer enhancement using a self-oscillating impinging planar jet

AU - Camci, Cengiz

AU - Herr, Frank

PY - 2002/8/1

Y1 - 2002/8/1

N2 - Impinging jets are widely used in the local enhancement of heat removed from internal passages of gas turbine blades. Arrays of stationary jets are usually impinged on surfaces of internal cooling passages. The current practice is to benefit from the high heat transfer coefficients existing in the vicinity of the jet impingement region on a target wall. The present study shows that a self-oscillating impinging-jet configuration is extremely beneficial in enhancing the heat removal performance of a conventional (stationary) impinging jet. In addition to a highly elevated stagnation line Nusselt number, the area coverage of the impingement zone is significantly enhanced because of the inherent sweeping motion of the oscillating coolant jet. When an oscillating jet (Re=14,000) is impinged on a plate normal to the jet axis (x/d=24 hole to plate distance), a typical enhancement of Nu number on the stagnation line is about 70 percent. The present paper explains detailed fluid dynamics structure of the self-oscillating jet by using a triple decomposition technique on a crossed hot wire signal. The current heat transfer enhancement levels achieved suggest that it may be possible to implement the present self-oscillating-impinging-jet concept in future gas turbine cooling systems, on rotating disks, glass tempering/ quenching, electronic equipment cooling, aircraft de-icing, combustors and heat exchangers.

AB - Impinging jets are widely used in the local enhancement of heat removed from internal passages of gas turbine blades. Arrays of stationary jets are usually impinged on surfaces of internal cooling passages. The current practice is to benefit from the high heat transfer coefficients existing in the vicinity of the jet impingement region on a target wall. The present study shows that a self-oscillating impinging-jet configuration is extremely beneficial in enhancing the heat removal performance of a conventional (stationary) impinging jet. In addition to a highly elevated stagnation line Nusselt number, the area coverage of the impingement zone is significantly enhanced because of the inherent sweeping motion of the oscillating coolant jet. When an oscillating jet (Re=14,000) is impinged on a plate normal to the jet axis (x/d=24 hole to plate distance), a typical enhancement of Nu number on the stagnation line is about 70 percent. The present paper explains detailed fluid dynamics structure of the self-oscillating jet by using a triple decomposition technique on a crossed hot wire signal. The current heat transfer enhancement levels achieved suggest that it may be possible to implement the present self-oscillating-impinging-jet concept in future gas turbine cooling systems, on rotating disks, glass tempering/ quenching, electronic equipment cooling, aircraft de-icing, combustors and heat exchangers.

UR - http://www.scopus.com/inward/record.url?scp=0036668069&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0036668069&partnerID=8YFLogxK

U2 - 10.1115/1.1471521

DO - 10.1115/1.1471521

M3 - Article

AN - SCOPUS:0036668069

VL - 124

SP - 770

EP - 782

JO - Journal of Heat Transfer

JF - Journal of Heat Transfer

SN - 0022-1481

IS - 4

ER -