About: Temperature non-uniformities and risk of overheating at a direct ohmic heating of foods

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About: Temperature non-uniformities and risk of overheating at a direct ohmic heating of foods Goto Sponge NotDistinct Permalink

An Entity of Type : http://linked.opendata.cz/ontology/domain/vavai/Vysledek, within Data Space : linked.opendata.cz associated with source document(s)

Attributes	Values
rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
rdfs:seeAlso	http://bulletin-am.cz/index.php/vam/article/view/92/89
Description	This paper is concerned with temperature non-uniformities especially the estimation of the risk of runaway and overheating at direct ohmic heating of food. The runaway criterion Rw, reflecting the role of temperature dependent electric conductivity and thermal resistance, is suggested. The influence of cooling, singularities at electrodes and fouling layer are analyzed, assuming properties of typical food materials (meat, milk) and typical process parameters. Results indicate that the risk of runaway at a very fast heating can be reduced by cooling a part of surface perpendicular to the intensity of electric field (cooled electrodes). It is further shown, that even if a small irregularity of the electrode surface (e.g. natural roughness) has a strong effect on the local intensity of electric field, temperature effects are seen only if the height of irregularities is comparable with the distance of electrodes (>5%). On the other hand, even very thin fouling layer at an electrode causes significant overheating, as soon as its electric conductivity is low. This paper is concerned with temperature non-uniformities especially the estimation of the risk of runaway and overheating at direct ohmic heating of food. The runaway criterion Rw, reflecting the role of temperature dependent electric conductivity and thermal resistance, is suggested. The influence of cooling, singularities at electrodes and fouling layer are analyzed, assuming properties of typical food materials (meat, milk) and typical process parameters. Results indicate that the risk of runaway at a very fast heating can be reduced by cooling a part of surface perpendicular to the intensity of electric field (cooled electrodes). It is further shown, that even if a small irregularity of the electrode surface (e.g. natural roughness) has a strong effect on the local intensity of electric field, temperature effects are seen only if the height of irregularities is comparable with the distance of electrodes (>5%). On the other hand, even very thin fouling layer at an electrode causes significant overheating, as soon as its electric conductivity is low. (en)
Title	Temperature non-uniformities and risk of overheating at a direct ohmic heating of foods Temperature non-uniformities and risk of overheating at a direct ohmic heating of foods (en)
skos:prefLabel	Temperature non-uniformities and risk of overheating at a direct ohmic heating of foods Temperature non-uniformities and risk of overheating at a direct ohmic heating of foods (en)
skos:notation	RIV/68407700:21220/08:00217257!RIV15-MSM-21220___
http://linked.open...avai/riv/aktivita	S
http://linked.open...avai/riv/aktivity	S
http://linked.open...iv/cisloPeriodika	14
http://linked.open...vai/riv/dodaniDat	2015
http://linked.open...aciTvurceVysledku	Nový, Michal Žitný, Rudolf Štancl, Jaromír
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	České vysoké učení technické v Praze / Fakulta strojní
http://linked.open...dnocenehoVysledku	399394
http://linked.open...ai/riv/idVysledku	RIV/68407700:21220/08:00217257
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	Direct ohmic heating; runaway; temperature non-uniformities; overheating; singularities; fouling (en)
http://linked.open.../riv/klicoveSlovo	Direct ohmic heating runaway temperature non-uniformities fouling overheating singularities
http://linked.open...odStatuVydavatele	CZ - Česká republika
http://linked.open...ontrolniKodProRIV	[0D6D274E348B]
http://linked.open...i/riv/nazevZdroje	Bulletin of Applied Mechanics
http://linked.open...in/vavai/riv/obor	GM
http://linked.open...ichTvurcuVysledku	3 (xsd:int)
http://linked.open...cetTvurcuVysledku	3 (xsd:int)
http://linked.open...UplatneniVysledku	2008
http://linked.open...v/svazekPeriodika	4
http://linked.open...iv/tvurceVysledku	Žitný, Rudolf Štancl, Jaromír Nový, Michal
issn	1801-1217
number of pages	7 (xsd:int)
http://localhost/t...ganizacniJednotka	21220

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