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Temperature distribution in vertical and horizontal high pressure vessels and its impact on food safety

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TitleInfo
Title
Temperature distribution in vertical and horizontal high pressure vessels and its impact on food safety
Name (type = personal)
NamePart (type = family)
Khurana
NamePart (type = given)
Meenakshi
NamePart (type = date)
1981-
DisplayForm
Meenakshi Khurana
Role
RoleTerm (authority = RULIB)
author
Name (type = personal)
NamePart (type = family)
Karwe
NamePart (type = given)
Mukund V
DisplayForm
Mukund V Karwe
Affiliation
Advisory Committee
Role
RoleTerm (authority = RULIB)
chair
Name (type = personal)
NamePart (type = family)
Yam
NamePart (type = given)
Kit L
DisplayForm
Kit L Yam
Affiliation
Advisory Committee
Role
RoleTerm (authority = RULIB)
internal member
Name (type = personal)
NamePart (type = family)
Takhistov
NamePart (type = given)
Paul
DisplayForm
Paul Takhistov
Affiliation
Advisory Committee
Role
RoleTerm (authority = RULIB)
internal member
Name (type = personal)
NamePart (type = family)
Anantheswaran
NamePart (type = given)
Ramaswamy
DisplayForm
Ramaswamy Anantheswaran
Affiliation
Advisory Committee
Role
RoleTerm (authority = RULIB)
outside member
Name (type = corporate)
NamePart
Rutgers University
Role
RoleTerm (authority = RULIB)
degree grantor
Name (type = corporate)
NamePart
Graduate School - New Brunswick
Role
RoleTerm (authority = RULIB)
school
TypeOfResource
Text
Genre (authority = marcgt)
theses
OriginInfo
DateCreated (qualifier = exact)
2012
DateOther (qualifier = exact); (type = degree)
2012-10
Place
PlaceTerm (type = code)
xx
Language
LanguageTerm (authority = ISO639-2b); (type = code)
eng
Abstract (type = abstract)
The temperature distribution during High Hydrostatic Pressure Processing (HHPP) is of particular concern when high pressure process is carried out at higher temperatures, such as those associated with pressure assisted thermal pasteurization (PATP) and pressure assisted thermal sterilization (PATS). The pressure assisted thermal processes combine high pressure and heat to achieve pasteurization/sterilization temperature in order to eliminate the bacteria while maintaining better quality. During these processes, inactivation by temperature is the primary mechanism. Therefore for such processes, it is important to examine the temperature variation within the vessel to evaluate its impact on product safety. The objective of this research was to predict the temperature distribution in vertical and horizontal high pressure vessels during pressure assisted thermal processing and to quantify the temperature non-uniformity and its impact on microbial inactivation. The CFD software ANSYS®-Fluent was used to numerically predict the flow, temperature and C. botulinum inactivation distributions. Coefficient of variation (COV) was used to quantify and compare the process uniformity for various cases. Further, alkaline phosphatase (ALP), an enzyme present in raw milk was used as an indicator for experimentally verifying process uniformity. The results obtained from the numerical simulations showed that the temperature non-uniformity arises in both vertical and horizontal high pressure vessels during HHPP due to the water added for compression, adiabatic compression heating, and conduction heat loss at vessel wall and ensuing natural convection cooling near the vessel wall. Based on the COV approach, (i) the temperature of water added for compression was found to have a major impact on the temperature distribution and inactivation of C. botulinum, (ii) adding an insulation to the vessel diminished the non-uniformity in temperature and C. botulinum, and (iii) process non-uniformity was found to be higher for a vertical vessel as compared to a horizontal vessel of same dimensions. Also, the experiments with alkaline phosphatase (ALP) in the vertical vessel showed location dependent inactivation, further confirming the existence of process non-uniformity. The results from this research will help in process validation and process filing with regulatory agencies (USDA-FSIS and US-FDA) to develop guidelines for producing safe PATP and PATS processed foods.
Subject (authority = RUETD)
Topic
Food Science
RelatedItem (type = host)
TitleInfo
Title
Rutgers University Electronic Theses and Dissertations
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ETD
Identifier
ETD_4366
PhysicalDescription
Form (authority = gmd)
electronic resource
InternetMediaType
application/pdf
InternetMediaType
text/xml
Extent
xxiii, 201 p. : ill.
Note (type = degree)
Ph.D.
Note (type = bibliography)
Includes bibliographical references
Note (type = statement of responsibility)
by Meenakshi Khurana
Subject (authority = ETD-LCSH)
Topic
High pressure (Technology)
Subject (authority = ETD-LCSH)
Topic
Food industry and trade
Subject (authority = ETD-LCSH)
Topic
Food--Quality
Subject (authority = ETD-LCSH)
Topic
Food--Safety measures
Identifier (type = hdl)
http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000066842
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TitleInfo
Title
Graduate School - New Brunswick Electronic Theses and Dissertations
Identifier (type = local)
rucore19991600001
Location
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NjNbRU
Identifier (type = doi)
doi:10.7282/T3BK1B4C
Genre (authority = ExL-Esploro)
ETD doctoral
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Rights

RightsDeclaration (ID = rulibRdec0006)
The author owns the copyright to this work.
RightsHolder (type = personal)
Name
FamilyName
Khurana
GivenName
Meenakshi
Role
Copyright Holder
RightsEvent
Type
Permission or license
DateTime (encoding = w3cdtf); (qualifier = exact); (point = start)
2012-10-03 12:10:09
AssociatedEntity
Name
Meenakshi Khurana
Role
Copyright holder
Affiliation
Rutgers University. Graduate School - New Brunswick
AssociatedObject
Type
License
Name
Author Agreement License
Detail
I hereby grant to the Rutgers University Libraries and to my school the non-exclusive right to archive, reproduce and distribute my thesis or dissertation, in whole or in part, and/or my abstract, in whole or in part, in and from an electronic format, subject to the release date subsequently stipulated in this submittal form and approved by my school. I represent and stipulate that the thesis or dissertation and its abstract are my original work, that they do not infringe or violate any rights of others, and that I make these grants as the sole owner of the rights to my thesis or dissertation and its abstract. I represent that I have obtained written permissions, when necessary, from the owner(s) of each third party copyrighted matter to be included in my thesis or dissertation and will supply copies of such upon request by my school. I acknowledge that RU ETD and my school will not distribute my thesis or dissertation or its abstract if, in their reasonable judgment, they believe all such rights have not been secured. I acknowledge that I retain ownership rights to the copyright of my work. I also retain the right to use all or part of this thesis or dissertation in future works, such as articles or books.
Copyright
Status
Copyright protected
Availability
Status
Open
Reason
Permission or license
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