Počet záznamů: 1
Synthetic and Continuous Jets Impinging on a Circular Cylinder
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SYSNO ASEP 0505915 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Synthetic and Continuous Jets Impinging on a Circular Cylinder Tvůrce(i) Broučková, Zuzana (UT-L) RID, ORCID
Trávníček, Zdeněk (UT-L) RID, ORCID
Vít, T. (CZ)Celkový počet autorů 3 Zdroj.dok. Heat Transfer Engineering. - : Taylor & Francis - ISSN 0145-7632
Roč. 40, 13-14 (2019), s. 1111-1125Poč.str. 15 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova synthetic jet ; cylinder ; heat transfer Vědní obor RIV BJ - Termodynamika Obor OECD Thermodynamics CEP GA16-16596S GA ČR - Grantová agentura ČR Způsob publikování Omezený přístup Institucionální podpora UT-L - RVO:61388998 UT WOS 000472768800005 EID SCOPUS 85045287583 DOI 10.1080/01457632.2018.1457245 Anotace 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. Pracoviště Ústav termomechaniky Kontakt Marie Kajprová, kajprova@it.cas.cz, Tel.: 266 053 154 ; Jana Lahovská, jaja@it.cas.cz, Tel.: 266 053 823 Rok sběru 2020 Elektronická adresa https://www.tandfonline.com/doi/full/10.1080/01457632.2018.1457245
Počet záznamů: 1