TY - JOUR

T1 - Heat transfer of impinging jet at low reynolds number

AU - Lemanov, Vadim V.

AU - Terekhov, Victor I.

AU - Terekhov, Vladimir V.

PY - 2018/1/1

Y1 - 2018/1/1

N2 - 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.

AB - 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.

KW - Convection

KW - Experimental and computational methods

KW - Heat transfer enhancement

KW - Impinging jets

KW - Jet and spray

KW - Laminar-turbulent transition

KW - Turbulent spots

KW - Vortex structure

UR - http://www.scopus.com/inward/record.url?scp=85068309340&partnerID=8YFLogxK

U2 - 10.1615/ihtc16.hte.023057

DO - 10.1615/ihtc16.hte.023057

M3 - Conference article

AN - SCOPUS:85068309340

VL - 2018-August

SP - 5501

EP - 5508

JO - International Heat Transfer Conference

JF - International Heat Transfer Conference

SN - 2377-424X

T2 - 16th International Heat Transfer Conference, IHTC 2018

Y2 - 10 August 2018 through 15 August 2018

ER -