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Statements

Subject Item
n2:RIV%2F46747885%3A24220%2F12%3A%230002363%21RIV13-GA0-24220___
rdf:type
n6:Vysledek skos:Concept
dcterms:description
A controlled impinging jet is a promising tool for various heat/mass transfer applications, such as drying technologies or cooling of highly loaded electronic devices or gas turbine blades. An axisymmetric air jet was excited using a system of four synthetic jets distributed around the circumference of the primary nozzle. First, the control synthetic jets were measured alone. After an adjustment, the primary axisymmetric jet was excited to the helical or bifurcating modes, and its behavior was studied experimentally including an impingement effect to the wall. For comparison purposes, a reference steady (unforced) jet from the same nozzle was also measured. The flow visualization, hot-wire anemometry, PIV, and naphthalene sublimation techniques were used. The main purpose was to investigate the influence of the actuation on the impingement heat transfer at the Reynolds numbers 1600 and 5000. The effects of the Strouhal number and nozzle-to-wall spacing on a distribution of the local heat transfer were evaluated. The most significant effects were found at the Strouhal numbers 0.14-0.32 at the ratio of the control to primary jet momentum rates only 0.24-2.4%. Under small nozzle-to-wall spacing H/D = 2, the excitation led to heat transfer increase in the stagnation area - the most prominent enhancement 40% was found at the stagnation point. Under moderate nozzle-to-wall spacing H/D = 6, the excitation made more uniform the Nusselt number distribution by means of a substantial reduction of the stagnation heat transfer rate. A controlled impinging jet is a promising tool for various heat/mass transfer applications, such as drying technologies or cooling of highly loaded electronic devices or gas turbine blades. An axisymmetric air jet was excited using a system of four synthetic jets distributed around the circumference of the primary nozzle. First, the control synthetic jets were measured alone. After an adjustment, the primary axisymmetric jet was excited to the helical or bifurcating modes, and its behavior was studied experimentally including an impingement effect to the wall. For comparison purposes, a reference steady (unforced) jet from the same nozzle was also measured. The flow visualization, hot-wire anemometry, PIV, and naphthalene sublimation techniques were used. The main purpose was to investigate the influence of the actuation on the impingement heat transfer at the Reynolds numbers 1600 and 5000. The effects of the Strouhal number and nozzle-to-wall spacing on a distribution of the local heat transfer were evaluated. The most significant effects were found at the Strouhal numbers 0.14-0.32 at the ratio of the control to primary jet momentum rates only 0.24-2.4%. Under small nozzle-to-wall spacing H/D = 2, the excitation led to heat transfer increase in the stagnation area - the most prominent enhancement 40% was found at the stagnation point. Under moderate nozzle-to-wall spacing H/D = 6, the excitation made more uniform the Nusselt number distribution by means of a substantial reduction of the stagnation heat transfer rate.
dcterms:title
Axisymmetric impinging jet excited by a synthetic jet system Axisymmetric impinging jet excited by a synthetic jet system
skos:prefLabel
Axisymmetric impinging jet excited by a synthetic jet system Axisymmetric impinging jet excited by a synthetic jet system
skos:notation
RIV/46747885:24220/12:#0002363!RIV13-GA0-24220___
n6:predkladatel
n7:orjk%3A24220
n3:aktivita
n10:Z n10:P
n3:aktivity
P(1M0553), P(GA101/09/1539), P(GA101/09/1959), P(IAA200760801), Z(AV0Z20760514)
n3:cisloPeriodika
volume 55, issue 4, 31 january
n3:dodaniDat
n21:2013
n3:domaciTvurceVysledku
n4:1755080 n4:2028069
n3:druhVysledku
n13:J
n3:duvernostUdaju
n11:S
n3:entitaPredkladatele
n18:predkladatel
n3:idSjednocenehoVysledku
124343
n3:idVysledku
RIV/46747885:24220/12:#0002363
n3:jazykVysledku
n16:eng
n3:klicovaSlova
Air jet, Axisymmetric, Axisymmetric jet, Drying technology, Electronic device, Gas turbine blades, Heat transfer rate, Hot-wire anemometry, Impingement effect, Impingement heat transfer, Impinging jet, Jet momentum, Local heat transfer, Naphthalene sublimation, Naphthalene sublimation technique, Nusselt number distribution, PIV, Stagnation points, Substantial reduction, Synthetic jets
n3:klicoveSlovo
n5:Axisymmetric n5:Axisymmetric%20jet n5:Hot-wire%20anemometry n5:Substantial%20reduction n5:Electronic%20device n5:PIV n5:Naphthalene%20sublimation n5:Air%20jet n5:Naphthalene%20sublimation%20technique n5:Nusselt%20number%20distribution n5:Gas%20turbine%20blades n5:Jet%20momentum n5:Stagnation%20points n5:Synthetic%20jets n5:Drying%20technology n5:Impingement%20effect n5:Impingement%20heat%20transfer n5:Impinging%20jet n5:Heat%20transfer%20rate n5:Local%20heat%20transfer
n3:kodStatuVydavatele
US - Spojené státy americké
n3:kontrolniKodProRIV
[BF134927CF20]
n3:nazevZdroje
International Journal of Heat and Mass Transfer
n3:obor
n20:BK
n3:pocetDomacichTvurcuVysledku
2
n3:pocetTvurcuVysledku
5
n3:projekt
n8:GA101%2F09%2F1959 n8:IAA200760801 n8:GA101%2F09%2F1539 n8:1M0553
n3:rokUplatneniVysledku
n21:2012
n3:svazekPeriodika
2012
n3:tvurceVysledku
Němcová, Lucie Kopecký, Václav Trávníček, Zdeněk Kordík, Jozef Tesař, Václav
n3:zamer
n17:AV0Z20760514
s:issn
0017-9310
s:numberOfPages
11
n12:doi
10.1016/j.ijheatmasstransfer.2011.09.015
n15:organizacniJednotka
24220