PIV and LIF study of flow and thermal fields of twine plumes in water

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388998%3A_____%2F17%3A00474772" target="_blank" >RIV/61388998:_____/17:00474772 - isvavai.cz</a>

Result on the web

<a href="https://www.epj-conferences.org/articles/epjconf/abs/2017/12/epjconf_efm2017_02012/epjconf_efm2017_02012.html" target="_blank" >https://www.epj-conferences.org/articles/epjconf/abs/2017/12/epjconf_efm2017_02012/epjconf_efm2017_02012.html</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1051/epjconf/201714302012" target="_blank" >10.1051/epjconf/201714302012</a>

Result language

angličtina

Original language name

PIV and LIF study of flow and thermal fields of twine plumes in water

Original language description

Flow and thermal fields of a pair of plane plumes in water are investigated by means of PIV and LIF experiments. The plumes are generated from thermal line sources, which are made out of electrically heated cylinders with a diameter of D = 1.21 mm. A cylinder-to-cylinder distance was 17.9 D. Either continuous or pulsating heating were used with the same heating input power. Because the cylinder-to-cylinder distance is moderately small, deflections of plumes from a vertical direction occur and the plumes are inclined together. This behavior is caused by a confined entrainment from a space between the both plumes. For a continuous heating, low frequency oscillations were identified and the natural frequency was evaluated as 0.5 Hz. Based on this finding, pulsating heating was used at the subharmonic frequency of 0.25 Hz. The maximum time-mean velocity magnitude at the continuous and pulsating heating were commensurable, approximately 0.007 m/s. On the other hand, pulsating heating achieves by 36 % higher velocity peaks. A very strong velocity oscillations were generated by pulsating heating at the distance approximately 8.3 D above the cylinders, where the velocity maxima oscillate along the time-mean value of 0.0057 m/s from −30% to +70 %. Temperature fields reasonably agree with this findings, despite a relatively fast equalization of the temperature field was concluded. The results demonstrate enhancement effects of pulsations in flow/thermal fields.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

10305 - Fluids and plasma physics (including surface physics)

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

EPJ Web of Conferences

ISBN

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ISSN

2100-014X

e-ISSN

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Number of pages

8

Pages from-to

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Publisher name

E D P SCIENCES

Place of publication

CEDEX

Event location

Mariánské Lázně

Event date

Nov 15, 2016

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

000407743800014