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Ultima descărcare din IBN: 2020-09-19 12:07 |
Căutarea după subiecte similare conform CZU |
532.526.5+536.24+620.9 (1) |
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Economia energiei în general (551) |
SM ISO690:2012 ЦЫНАЕВА, Анна. Численное исследование теплообмена в канале с продольным градиентом давления. In: Problemele Energeticii Regionale, 2019, nr. 2(43), pp. 10-22. ISSN 1857-0070. DOI: https://doi.org/10.5281/zenodo.3367076 |
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Problemele Energeticii Regionale | ||||||
Numărul 2(43) / 2019 / ISSN 1857-0070 | ||||||
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DOI:https://doi.org/10.5281/zenodo.3367076 | ||||||
CZU: 532.526.5+536.24+620.9 | ||||||
Pag. 10-22 | ||||||
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The work is devoted to the study of heat transfer in channels with a longitudinal pressure gradient. The aim of the work is to develop methods for increasing the heat transfer intensity in channels with a longitudinal pressure gradient. The goal was achieved by developing the original design of the surface intensifier, made in the form of a horseshoe-shaped dimples, as well as by conducting heat transfer studies in the channel with a longitudinal pressure gradient and dimples of various geometries and locations. It was found that a numerical solution using the k-epsilon turbulence model shows not sufficiently stable results, including the values of local heat transfer coefficients can exceed 2 ... 2.5 times their actual values for a single dimple. Moreover, the use of the k-w-sst turbulence model shows more stable results. The most significant results obtained in the work are as follows: it was revealed that the use of holes, their geometry and location have a significant effect on the heat transfer intensity in a channel with a longitudinal pressure gradient; the design of the original horseshoe-shaped dimples has been developed, the use of which allows to intensify heat transfer by 13 ... 47% depending on the Reynolds number when they are arranged in three rows in the corridor order compared to staggered hemispherical dimples; when comparing the efficiency of using the developed dimples with hemispherical holes installed in three rows in the corridor order, the heat transfer increased by 21 ... 51% when the Reynolds number changed from 3000 to 15000. Keywords: cooling system, turbine blades, heat transfer, pressure gradient, simulation, channel, dimples. |
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Cuvinte-cheie cooling system, turbine blades, heat transfer, pressure gradient, simulation, channel, dimples, Studiu numeric de schimb de căldură într-un canal cu un gradient de presiune longitudinal, Численное исследование теплообмена в канале с продольным градиентом давления |
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