Synthetic and Continuous Jets Impinging on a Circular Cylinder

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dc.contributor.authorBroučková, Zuzana
dc.contributor.authorTrávníček, Zdeněk
dc.contributor.authorVít, Tomáš
dc.date.accessioned2019-07-26T06:37:47Z
dc.date.available2019-07-26T06:37:47Z
dc.date.issued2019-08-27
dc.description.abstractSynthetic 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.cs
dc.format.extent16 strancs
dc.identifier.doi10.1080/01457632.2018.1457245
dc.identifier.urihttps://dspace.tul.cz/handle/15240/152977
dc.identifier.urihttps://www.tandfonline.com/doi/full/10.1080/01457632.2018.1457245
dc.language.isocscs
dc.publisherTaylor & Francis
dc.relation.ispartofHEAT TRANSFER ENGINEERING
dc.relation.ispartofHeat Transfer Engineering journal
dc.subjectNUMBERcs
dc.subjectHEAT-TRANSFERcs
dc.subjectEVOLUTIONcs
dc.subjectFLOWcs
dc.subjectACTUATORScs
dc.subjectCRITERIONcs
dc.subjectLAMINARcs
dc.titleSynthetic and Continuous Jets Impinging on a Circular Cylindercs
local.citation.epage1125
local.citation.spage1111
local.event.locationMalaga, SPAIN
local.event.title12th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics (HEFAT)
local.relation.issue13-14
local.relation.volume40
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