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Turbulenten mehurčkast tok = [Turbulent bubbly flow] : magisterijGrošelj, JanezObravnavan je bil polno razvit turbulenten enofazen in turbulenten mehurčkast tok v navpični cevi. Uporabljena je bila strukturna analiza, ki dopušča obravnavo turbulentnega toka na krajevnih skalah, ... ki so večje od skale Kolmogorova in s tem znatno prihrani računalniški čas in spomin. V predpostavljeni fizikalni sliki so na polju turbulenčne kinetične energije superponirani dispativni vrtinci in mehurčki. Polje turbulenčne kinetične energije je omejeno z integralsko skalo turbulence A, velikost dispiativnih vrtincev pa je definirano s Taylorjevo mikroskalo. Posebej je bila dodana še mejna plast ob steni. Prostorske relacije med elementi kontinuuma so izražene s komunikacijami med elementi v posameznem zamrznjenem časovnem trenutku. Možnost komunikacije med dvema elementoma je predpisana s stičnimi pogoji zaradi prisotnosti disipativnih vrtincev in mehurčkov in z robnimi pogoji v mejni plasti. Intenziteta komuniciranja med elementi je po predostavki sorazmerna s fluktuacijami hitrosti v turbulentnem toku. Na osnovi matrične algebre je bil narejen model, ki napoveduje fluktuacije hitrosti turbulentnega enofaznega in mehurčkastega toka. V tem delu je bila na novo vpeljana mejna plast in upoštevana deformacija mehurčkov ob steni, kar je izboljšalo rezultate napovedi fluktuacij hitrosti v turbulentnem enofaznem in mehurčkastem toku v cevi. S strukturno analizo je bila napovedana dolžina recirkulacijske cone v primeru toka v kanalu s stopnico, kar potrjuje sledenje evolucijskih sposobnosti po kraju za enofazni tok. Napovedi fluktuacij hitrosti v mehurčkastem turbulentnem toku, ki so bile izvedene za različne pretoke vode pri različnih deležih plinaste faze, kažejo v primerjavi z objavljenimi eksperimentalnimi podatki, dobro ujemanje pri deležih plinaste faze do 10%. Napovedi fluktuacij hitrosti zajemajo tudi do sedaj še nepojasnjen fenomen ojačitve in dušitve turbulence v mehurčkastem toku.Type of material - master's thesisPublication and manufacture - Ljubljana : [J. Grošelj], 1994Language - slovenianCOBISS.SI-ID - 811803
Author
Grošelj, Janez
Other authors
Žun, Iztok
Topics
tok v cevi |
tok turbulentni |
tok mehurčkast |
tok v kanalu |
modeli toka |
analize strukturne |
hitrosti tokov |
fluktuacija hitrosti |
sloji mejni |
mehurčki |
deformacije |
eksperimenti |
primerjave rezultatov
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Library | Call number – location, accession no. ... | Copy status |
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National and University Library, Ljubljana | DS II 445964 dislocirano skladišče Leskoškova | available - reading room |
Faculty of Mechanical Engineering, Lj. | M GROŠELJ J. Turbulenten IN: 00037927 |
available - reading room |
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Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Grošelj, Janez | 11669 |
Žun, Iztok | 03544 |
Source: Personal bibliographies
and: SICRIS
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