Experimental determination of surface heat transfer coefficient in a dry ice-ethanol cooling bath using a numerical approach

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Abstract: Background: Dry ice-ethanol bath (-78ºC) have been widely used in low temperature biological research to attain rapid cooling of samples below freezing temperature. The prediction of cooling rates of biological samples immersed in dry ice-ethanol bath is of practical interest in cryoprese...

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Autores principales: Santos, María V., Sansiñena, Marina Julia, Zaritzky, Noemí, Chirife, Jorge
Formato: Artículo
Lenguaje:Inglés
Publicado: 2022
Materias:
TEMPERATURA
ENFRIAMIENTO
TRANSFERENCIA DE CALOR
ETANOL
Acceso en línea:https://repositorio.uca.edu.ar/handle/123456789/15089
Aporte de:
Repositorio Institucional de la Universidad Católica Argentina (UCA) de Universidad Católica Argentina
id I33-R139-123456789-15089
record_format dspace
institution Universidad Católica Argentina
institution_str I-33
repository_str R-139
collection Repositorio Institucional de la Universidad Católica Argentina (UCA)
language Inglés
topic TEMPERATURA
ENFRIAMIENTO
TRANSFERENCIA DE CALOR
ETANOL
spellingShingle TEMPERATURA
ENFRIAMIENTO
TRANSFERENCIA DE CALOR
ETANOL
Santos, María V.
Sansiñena, Marina Julia
Zaritzky, Noemí
Chirife, Jorge
Experimental determination of surface heat transfer coefficient in a dry ice-ethanol cooling bath using a numerical approach
topic_facet TEMPERATURA
ENFRIAMIENTO
TRANSFERENCIA DE CALOR
ETANOL
description Abstract: Background: Dry ice-ethanol bath (-78ºC) have been widely used in low temperature biological research to attain rapid cooling of samples below freezing temperature. The prediction of cooling rates of biological samples immersed in dry ice-ethanol bath is of practical interest in cryopreservation. The cooling rate can be obtained using mathematical models representing the heat conduction equation in transient state. Additionally, at the solid cryogenic-fluid interface, the knowledge of the surface heat transfer coefficient (h) is necessary for the convective boundary condition in order to correctly establish the mathematical problem. Objective: The study was to apply numerical modeling to obtain the surface heat transfer coefficient of a dry ice-ethanol bath. Materials and methods: A numerical finite element solution of heat conduction equation was used to obtain surface heat transfer coefficients from measured temperatures at the center of polytetrafluoroethylene and polymethylmetacrylate cylinders immersed in a dry ice-ethanol cooling bath. The numerical model considered the temperature dependence of thermophysical properties of plastic materials used. Results: A negative linear relationship is observed between cylinder diameter and heat transfer coefficient in the liquid bath, the calculated h values were 308, 135 and 62.5 W/(m2K) for PMMA 1.3, PTFE 2.59 and 3.14 cm in diameter, respectively. Conclusion: The calculated heat transfer coefficients were consistent among several replicates; h in dry ice-ethanol showed an inverse relationship with cylinder diameter.
format Artículo
author Santos, María V.
Sansiñena, Marina Julia
Zaritzky, Noemí
Chirife, Jorge
author_facet Santos, María V.
Sansiñena, Marina Julia
Zaritzky, Noemí
Chirife, Jorge
author_sort Santos, María V.
title Experimental determination of surface heat transfer coefficient in a dry ice-ethanol cooling bath using a numerical approach
title_short Experimental determination of surface heat transfer coefficient in a dry ice-ethanol cooling bath using a numerical approach
title_full Experimental determination of surface heat transfer coefficient in a dry ice-ethanol cooling bath using a numerical approach
title_fullStr Experimental determination of surface heat transfer coefficient in a dry ice-ethanol cooling bath using a numerical approach
title_full_unstemmed Experimental determination of surface heat transfer coefficient in a dry ice-ethanol cooling bath using a numerical approach
title_sort experimental determination of surface heat transfer coefficient in a dry ice-ethanol cooling bath using a numerical approach
publishDate 2022
url https://repositorio.uca.edu.ar/handle/123456789/15089
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AT zaritzkynoemi experimentaldeterminationofsurfaceheattransfercoefficientinadryiceethanolcoolingbathusinganumericalapproach
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