Effect of nozzle inclination on jet-impingement heat transfer in a confined cross-flow

J. Ward, M. T. Oladiran, G. P. Hammond

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Citations (Scopus)

Abstract

This paper reports measurements of the heat transfer associated with discharge of a single circular jet into an essentially uniform cross-flow. The jet was discharged both orthogonally and at a range of angles of inclination upstream into the cross-flow. The convective heat transfer distributions beneath the jet were derived by means of the Chilton-Colburn analogy from mass-transfer measurements obtained by a 'thin-film' naphthalene sublimation technique. With weak cross-flows (i.e. jet to cross-flow velocity ratios, M>10) the maximum impingement heat transfer occurred with orthogonal discharge. This was expected, since, for jets discharging into initially quiescent surroundings it has been found by previous investigators that nozzle inclination reduces impingement heat transfer. However, at higher cross-flows the maximum heat transfer coefficients were obtained with the jet inclined at an angle of about 30° obliquely against the cross-flow. This appears to be associated with improved penetration of the jet into the cross-stream so that the jet is less readily deflected away from the impingement surface. Jet inclination can thus offer significantly enhanced heat transfer under severe cross-flow conditions.

Original languageEnglish
Title of host publicationFundamentals of Forced Convection Heat Transfer
PublisherPubl by ASME
Pages25-31
Number of pages7
Volume181
ISBN (Print)0791808335
Publication statusPublished - Dec 1 1991
EventWinter Annual Meeting of the American Society of Mechanical Engineers - Atlanta, GA, USA
Duration: Dec 1 1991Dec 6 1991

Other

OtherWinter Annual Meeting of the American Society of Mechanical Engineers
CityAtlanta, GA, USA
Period12/1/9112/6/91

Fingerprint

Nozzles
Heat transfer
Sublimation
Naphthalene
Flow velocity
Heat transfer coefficients
Mass transfer
Thin films

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

Cite this

Ward, J., Oladiran, M. T., & Hammond, G. P. (1991). Effect of nozzle inclination on jet-impingement heat transfer in a confined cross-flow. In Fundamentals of Forced Convection Heat Transfer (Vol. 181, pp. 25-31). Publ by ASME.
Ward, J. ; Oladiran, M. T. ; Hammond, G. P. / Effect of nozzle inclination on jet-impingement heat transfer in a confined cross-flow. Fundamentals of Forced Convection Heat Transfer. Vol. 181 Publ by ASME, 1991. pp. 25-31
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Ward, J, Oladiran, MT & Hammond, GP 1991, Effect of nozzle inclination on jet-impingement heat transfer in a confined cross-flow. in Fundamentals of Forced Convection Heat Transfer. vol. 181, Publ by ASME, pp. 25-31, Winter Annual Meeting of the American Society of Mechanical Engineers, Atlanta, GA, USA, 12/1/91.

Effect of nozzle inclination on jet-impingement heat transfer in a confined cross-flow. / Ward, J.; Oladiran, M. T.; Hammond, G. P.

Fundamentals of Forced Convection Heat Transfer. Vol. 181 Publ by ASME, 1991. p. 25-31.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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N2 - This paper reports measurements of the heat transfer associated with discharge of a single circular jet into an essentially uniform cross-flow. The jet was discharged both orthogonally and at a range of angles of inclination upstream into the cross-flow. The convective heat transfer distributions beneath the jet were derived by means of the Chilton-Colburn analogy from mass-transfer measurements obtained by a 'thin-film' naphthalene sublimation technique. With weak cross-flows (i.e. jet to cross-flow velocity ratios, M>10) the maximum impingement heat transfer occurred with orthogonal discharge. This was expected, since, for jets discharging into initially quiescent surroundings it has been found by previous investigators that nozzle inclination reduces impingement heat transfer. However, at higher cross-flows the maximum heat transfer coefficients were obtained with the jet inclined at an angle of about 30° obliquely against the cross-flow. This appears to be associated with improved penetration of the jet into the cross-stream so that the jet is less readily deflected away from the impingement surface. Jet inclination can thus offer significantly enhanced heat transfer under severe cross-flow conditions.

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Ward J, Oladiran MT, Hammond GP. Effect of nozzle inclination on jet-impingement heat transfer in a confined cross-flow. In Fundamentals of Forced Convection Heat Transfer. Vol. 181. Publ by ASME. 1991. p. 25-31