Heat transfer in the evaporation channels of film evaporators

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dc.contributor.authorRyabchuk, Alexander
dc.contributor.authorPetrenko, Valentin
dc.date.accessioned2013-10-10T13:19:10Z
dc.date.available2013-10-10T13:19:10Z
dc.date.issued2013
dc.description.abstractThere is an urgent need in the reliable correlation allowing calculation of heat transfer coefficients to highly concentrated films boiling at vacuum, which refers to the operational regimes of vacuum pans of multistage evaporators in the sugar industry. According to the stated objective, a rigorous study into thermo - and hydrodynamic parameters of film flows has been carried out. For this purpose a special experimental rig aimed at the modeling of two - phase flows with independent phases’ flow rates formation has been developed and erected. Experimentation enveloped the regimes of evaporation free interphase surface as well as boiling at forced convection in down falling liquid films of sugar solutions within a wide range of concentrations at atmospheric pressure and vacuum. The solution mass concentration range d within 0…72%. Analysis of the obtained data has proven, firstly, that the resultant of correlation may be based on the idea of the inter – phase turbulence suppression. Secondly, experimental data showed that the simple criteria of the onset of the nuclear boiling in – films could be formed with the limiting condition of the steam phase appearing: which is overheating of the heat transfer surface with the given roughness of it. The resultant equation which can be used for the calculations of heat transfer coefficients to the saturated gravitational falling films in pipes is derived. This equation can be used equally within the regime of evaporation from the interphase as well as within the regime of nucleate boiling at forced convection.uk_UK
dc.identifier.citationRiabchuk, O. Heat Transfer to the falling viscous films of sugar solutions / O. Riabchuk, V. Petrenko // NEEFood-2013 : Second North and East European Congress on Food, 26-29 May 2013 : book of abstract - St. Kyiv, 2013. – P. 9.uk_UK
dc.identifier.urihttps://dspace.nuft.edu.ua/handle/123456789/10273
dc.language.isootheruk_UK
dc.subjectgravitational descending filmsuk_UK
dc.subjectsugar solutionsuk_UK
dc.subjectforced convectionuk_UK
dc.subjectmultistage evaporatoruk_UK
dc.subjectvacuumuk_UK
dc.subjectгравітаційно-стікаючі плівкиuk_UK
dc.subjectцукрові розчиниuk_UK
dc.subjectвимушена конвекціяuk_UK
dc.subjectвипарна установкаuk_UK
dc.subjectкафедра теплоенергетики та холодильної техніки
dc.titleHeat transfer in the evaporation channels of film evaporatorsuk_UK

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