Influence of electrohydrodynamic liquid flow on heat transfer at boiling
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MARDARSKII, Orest; BOLOGA, Mircea; CHERNICA, Ion; KOZHEVNIKOV, Igor. Influence of electrohydrodynamic liquid flow on heat transfer at boiling. In: Materials Science and Condensed Matter Physics. Ediția a 9-a, 25-28 septembrie 2018, Chișinău. Chișinău, Republica Moldova: Institutul de Fizică Aplicată, 2018, p. 256.
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Materials Science and Condensed Matter Physics
Ediția a 9-a, 2018
Conferința "International Conference on Materials Science and Condensed Matter Physics"
Chișinău, Moldova, 25-28 septembrie 2018

Influence of electrohydrodynamic liquid flow on heat transfer at boiling


CZU: 536.24
Pag. 256-256

Mardarskii Orest, Bologa Mircea, Chernica Ion, Kozhevnikov Igor
 
Institute of Applied Physics
 
Disponibil în IBN: 11 februarie 2019


Rezumat

Tendencies to miniaturization of electrotechnical and electronic equipment is typical for the modern development of them; thus, there increase the specific heat loads, get worse the cooling and thermal conditions of separate units and blocks, and degrade the equipment reliability. It is necessary to develop more effective methods of heat transfer enhancement, to design compact efficient heat exchangers, reliable systems of cooling and thermostatting. By now there is accumulated a wide experimental information concerning the influence of an electrical field on heat transfer enhancement which is usually associated with the electroconvective disturbances of liquid. The field action efficiency is also determined by the heat- and electrophysical properties of a heat carrier, the form and sizes of electrodes, the field intensity and the field nonuniformity degree. However, the electroconvective methods of cooling with the growth in heat loads not always ensure the necessary temperature conditions, thus, it is required to elaborate evaporative cooling systems (active control closed-loop electrohydrodynamic systems). It is interesting to study hydrodynamics and heat transfer at phase transformation using special electrodes.  The report presents the results of experimental investigation of nonuniform electrical field action on heat transfer and boiling process of a dielectric liquid (hexane, with a boiling temperature of 68,7 ºС) in bulk. The heating of the heat-release element (stainless tube) was performed with direct current. The high-voltage electrode (insulated wire with notches facing the heating surface) was placed over the heating surface.  There were obtained the experimental dependences of heat transfer intensity on the heat flux density, interelectrode gap and field intensity. The field influence on the bubbling process reduces with the increase in the heat flux density indicated by the local values of the heat transfer coefficient. The results are in good agreement with literature data and calculated functions (fig. 1). There is investigated the influence of the interelectrode gap on the heat transfer intensity whose optimum value is δ=2,5–3 mm. There is compared the experimental results concerning the heat transfer intensity at boiling as a function of the counter electrode form and profile. At little intensities it is preferable to use a solid electrode 1, and at an intensity of about 40 kV/cm and higher it is necessary to use an electrode with notches 2 (fig. 2).

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@article{ibn_27746,
author = {Udiac, V.},
title = {Компетенция органов государственной власти: понятие, сущность, особенности},
journal = {Legea şi Viaţa},
year = {2013},
volume = {263 (11/2)},
pages = {219-223},
month = {Sep},
abstract = {(EN) The paper analyzes and summarizes scientific approaches and existing legislation regarding interpretation of the concept and
essence of the competence of public authorities. The article discovers components of the competence of public authorities. It was found that the powers are a tool of influence of the government agencies on their subordinate objects, subjects of jurisdiction – the range of social relations to which extends the influence of state authorities; tasks – the amount of work public bodies have to perform and functions – activities that define the basic purpose of public authorities. The author singles out the definition and attributes which characterize the concept of «the competence of public authorities».},
abstract = {(RU) В статье проведен анализ и обобщены научные подходы и действующее законодательство относительно трактовки понятия и сущности компетенции органов государственной власти. Раскрыты составные элементы компетенции органов государственной власти. Выяснено, что полномочия являются инструментом властного влияния государственных органов на подведомственные им объекты; предметы ведения – кругом тех общественных отношений, на которые распространяется властное влияние государственных органов; задачи – объемом работы, которую должны выполнять государственные органы; функции – направлениями деятельности, которые определяют основное назначение государственных органов. Предложено авторское определение и выделены признаки, характеризующие понятие «компетенция органов государственной власти».},
url = {https://ibn.idsi.md/vizualizare_articol/27746},
keywords = {компетенция, компетенция органов государственной власти, полномочия, права и обязанности, предметы ведени}
}