Synthetic and Continuous Jets Impinging on a Circular Cylinder
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388998%3A_____%2F19%3A00505915" target="_blank" >RIV/61388998:_____/19:00505915 - isvavai.cz</a>
Alternative codes found
RIV/46747885:24210/19:00008176
Result on the web
<a href="https://www.tandfonline.com/doi/full/10.1080/01457632.2018.1457245" target="_blank" >https://www.tandfonline.com/doi/full/10.1080/01457632.2018.1457245</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1080/01457632.2018.1457245" target="_blank" >10.1080/01457632.2018.1457245</a>
Alternative languages
Result language
angličtina
Original language name
Synthetic and Continuous Jets Impinging on a Circular Cylinder
Original language description
Synthetic and continuous water jets impinging onto an electrically heated circular cylinder were experimentally investigated. The slot nozzle width was 0.36 mm, the cylinder diameter was 1.2 mm, and the cylinder-to-nozzle spacing related to the slot width was 5-21. Two optical methods were used: qualitative laser-induced fluorescence (LIF) visualization and laser Doppler vibrometry (LDV) measurements. Simultaneously with the optical experiments, the overall convective heat transfer from the circular cylinder was evaluated. The LDV quantified the velocity of the oscillating piezo-driven diaphragm at frequencies from 30 to 68 Hz. A majority of the study was performed at the near-resonant frequencies from 46 to 49 Hz. For all investigated jets, the Reynolds numbers based on the nozzle width ranged from 36 to 171. The LIF visualization revealed a dominant flow separation occurring on the windward cylinder side. This result is attributed to the effect of the miniscales, a relatively small ratio of the nozzle width to the cylinder diameter, and low Reynolds numbers. An increase in the Reynolds number changes the flow pattern from a steady jet-flow separation to a vortex shedding wake-flow regime. The heat transfer experiments were validated in a natural convection regime. An enhancement of the average Nusselt numbers by 4.2-6.2 times by means of the synthetic jets was quantified by comparison with the natural convection regime. A correlation for the average Nusselt number was proposed for both the continuous and synthetic jets.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
20303 - Thermodynamics
Result continuities
Project
<a href="/en/project/GA16-16596S" target="_blank" >GA16-16596S: Optimization of pulsatile jet actuation in fluid mechanics</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Heat Transfer Engineering
ISSN
0145-7632
e-ISSN
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Volume of the periodical
40
Issue of the periodical within the volume
13-14
Country of publishing house
US - UNITED STATES
Number of pages
15
Pages from-to
1111-1125
UT code for WoS article
000472768800005
EID of the result in the Scopus database
2-s2.0-85045287583