Heat transfer of impinging jet at low reynolds number

Vadim V. Lemanov, Victor I. Terekhov, Vladimir V. Terekhov

Research output: Contribution to journalConference articlepeer-review

Abstract

Thermal characteristics at impact axisymmetric air jet impingement on a flat obstacle have been studied experimentally and numerically. The influence of Reynolds number (100<Re<12000) on heat transfer at jet outflow from a long pipe (with diameter d=3.2 mm and relative length h/d =200) was studied at a distance to the obstacle h/d=20 and at constant wall temperature. In the area of Re<4000, in contrast to the known monotonous growth of heat transfer, the maximum heat transfer has been discovered. For the outflow from the tube there is a significant increase in Nusselt number up to 200-600% in comparison with the case when the jet outflows from the nozzle. At Re>4000 the difference in thermal transfer for the two versions of jet formation (from the tube and from the nozzle) asymptotically decreases. The numerical results qualitatively agree with experimental data in laminar and turbulent flow regimes.

Original languageEnglish
Pages (from-to)5501-5508
Number of pages8
JournalInternational Heat Transfer Conference
Volume2018-August
DOIs
Publication statusPublished - 1 Jan 2018
Event16th International Heat Transfer Conference, IHTC 2018 - Beijing, China
Duration: 10 Aug 201815 Aug 2018

Keywords

  • Convection
  • Experimental and computational methods
  • Heat transfer enhancement
  • Impinging jets
  • Jet and spray
  • Laminar-turbulent transition
  • Turbulent spots
  • Vortex structure

OECD FOS+WOS

  • 2.07 ENVIRONMENTAL ENGINEERING
  • 1.03 PHYSICAL SCIENCES AND ASTRONOMY
  • 1.04 CHEMICAL SCIENCES

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