HEAT TRANSTER AT EVAPORATIVE CONCENTRATION OF DOWN FLOWING IN VERTICAL PIPES SOLUTIONS IN ANNULAR REGIMES

In many branches of food processing, particularly in sugar production, the solution concentration takes place within industrial multi effect evaporator; here, the solution moves down as a liquid film forming annular descending flow in vertical heated pipes. It should be noticed that within the evapo...

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Autores principales:	Valentin PETRENKO, Yaroslav ZASIADKO
Formato:	article
Lenguaje:	EN
Publicado:	Stefan cel Mare University of Suceava 2018
Materias:	heat flux heat transfer coefficient (HTC) depression interphase surface Food processing and manufacture TP368-456
Acceso en línea:	https://doaj.org/article/b342f07c225249719ea78953db59e804
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spelling	oai:doaj.org-article:b342f07c225249719ea78953db59e8042021-12-02T19:35:53ZHEAT TRANSTER AT EVAPORATIVE CONCENTRATION OF DOWN FLOWING IN VERTICAL PIPES SOLUTIONS IN ANNULAR REGIMES2068-66092559-6381https://doaj.org/article/b342f07c225249719ea78953db59e8042018-03-01T00:00:00Zhttp://www.fia.usv.ro/fiajournal/index.php/FENS/article/view/553/521https://doaj.org/toc/2068-6609https://doaj.org/toc/2559-6381In many branches of food processing, particularly in sugar production, the solution concentration takes place within industrial multi effect evaporator; here, the solution moves down as a liquid film forming annular descending flow in vertical heated pipes. It should be noticed that within the evaporation station the liquid which is being evaporated significantly changes its physical properties due to the fact that the concentration of the solution increases by the range of 14…65% of dry matter. The operational process parameters (pressure, temperature, etc.) also change to a noticeable degree. These factors determine a wide range of liquid films flow patterns, namely film thickness, surface wavy structures, velocity distribution across the films, interphase shear stress and, as a result of these, the making of a certain heat transfer mechanism including bubble boiling or its suppression. Unfortunately, the reliable methods of prediction and calculation of heat transfer coefficients are unavailable, which seriously hampers the designing and calculation of efficient evaporators and other heat transfer equipment. The work presents the results of modeling heat transfer to saturated liquid films of solutions flowing down inside the vertical pipes as in the regime of evaporation from the interphase surface and in that of surface boiling. The correlations given allow calculating the heat transfer coefficients for liquid films being concentrated in the vertical pipes ofValentin PETRENKOYaroslav ZASIADKOStefan cel Mare University of Suceavaarticleheat fluxheat transfer coefficient (HTC)depressioninterphase surfaceFood processing and manufactureTP368-456ENFood and Environment Safety, Vol 17, Iss 1, Pp 9-19 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	heat flux heat transfer coefficient (HTC) depression interphase surface Food processing and manufacture TP368-456
spellingShingle	heat flux heat transfer coefficient (HTC) depression interphase surface Food processing and manufacture TP368-456 Valentin PETRENKO Yaroslav ZASIADKO HEAT TRANSTER AT EVAPORATIVE CONCENTRATION OF DOWN FLOWING IN VERTICAL PIPES SOLUTIONS IN ANNULAR REGIMES
description	In many branches of food processing, particularly in sugar production, the solution concentration takes place within industrial multi effect evaporator; here, the solution moves down as a liquid film forming annular descending flow in vertical heated pipes. It should be noticed that within the evaporation station the liquid which is being evaporated significantly changes its physical properties due to the fact that the concentration of the solution increases by the range of 14…65% of dry matter. The operational process parameters (pressure, temperature, etc.) also change to a noticeable degree. These factors determine a wide range of liquid films flow patterns, namely film thickness, surface wavy structures, velocity distribution across the films, interphase shear stress and, as a result of these, the making of a certain heat transfer mechanism including bubble boiling or its suppression. Unfortunately, the reliable methods of prediction and calculation of heat transfer coefficients are unavailable, which seriously hampers the designing and calculation of efficient evaporators and other heat transfer equipment. The work presents the results of modeling heat transfer to saturated liquid films of solutions flowing down inside the vertical pipes as in the regime of evaporation from the interphase surface and in that of surface boiling. The correlations given allow calculating the heat transfer coefficients for liquid films being concentrated in the vertical pipes of
format	article
author	Valentin PETRENKO Yaroslav ZASIADKO
author_facet	Valentin PETRENKO Yaroslav ZASIADKO
author_sort	Valentin PETRENKO
title	HEAT TRANSTER AT EVAPORATIVE CONCENTRATION OF DOWN FLOWING IN VERTICAL PIPES SOLUTIONS IN ANNULAR REGIMES
title_short	HEAT TRANSTER AT EVAPORATIVE CONCENTRATION OF DOWN FLOWING IN VERTICAL PIPES SOLUTIONS IN ANNULAR REGIMES
title_full	HEAT TRANSTER AT EVAPORATIVE CONCENTRATION OF DOWN FLOWING IN VERTICAL PIPES SOLUTIONS IN ANNULAR REGIMES
title_fullStr	HEAT TRANSTER AT EVAPORATIVE CONCENTRATION OF DOWN FLOWING IN VERTICAL PIPES SOLUTIONS IN ANNULAR REGIMES
title_full_unstemmed	HEAT TRANSTER AT EVAPORATIVE CONCENTRATION OF DOWN FLOWING IN VERTICAL PIPES SOLUTIONS IN ANNULAR REGIMES
title_sort	heat transter at evaporative concentration of down flowing in vertical pipes solutions in annular regimes
publisher	Stefan cel Mare University of Suceava
publishDate	2018
url	https://doaj.org/article/b342f07c225249719ea78953db59e804
work_keys_str_mv	AT valentinpetrenko heattransteratevaporativeconcentrationofdownflowinginverticalpipessolutionsinannularregimes AT yaroslavzasiadko heattransteratevaporativeconcentrationofdownflowinginverticalpipessolutionsinannularregimes
_version_	1718376401258676224

HEAT TRANSTER AT EVAPORATIVE CONCENTRATION OF DOWN FLOWING IN VERTICAL PIPES SOLUTIONS IN ANNULAR REGIMES

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