Experimental determination of surface heat transfer coefficient in a dry ice-ethanol cooling bath using a numerical approach
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. Th...
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Formato: | Articulo |
Lenguaje: | Inglés |
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2017
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Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/103587 |
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I19-R120-10915-103587 |
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institution |
Universidad Nacional de La Plata |
institution_str |
I-19 |
repository_str |
R-120 |
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SEDICI (UNLP) |
language |
Inglés |
topic |
Química Heat transfer coefficient Dry ice-ethanol cooling bath Unsteady state heat conduction |
spellingShingle |
Química Heat transfer coefficient Dry ice-ethanol cooling bath Unsteady state heat conduction Santos, María Victoria Sansinena, Marina Zaritzky, Noemí Elisabet Chirife, Jorge Experimental determination of surface heat transfer coefficient in a dry ice-ethanol cooling bath using a numerical approach |
topic_facet |
Química Heat transfer coefficient Dry ice-ethanol cooling bath Unsteady state heat conduction |
description |
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 |
Articulo Articulo |
author |
Santos, María Victoria Sansinena, Marina Zaritzky, Noemí Elisabet Chirife, Jorge |
author_facet |
Santos, María Victoria Sansinena, Marina Zaritzky, Noemí Elisabet Chirife, Jorge |
author_sort |
Santos, María Victoria |
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 |
2017 |
url |
http://sedici.unlp.edu.ar/handle/10915/103587 |
work_keys_str_mv |
AT santosmariavictoria experimentaldeterminationofsurfaceheattransfercoefficientinadryiceethanolcoolingbathusinganumericalapproach AT sansinenamarina experimentaldeterminationofsurfaceheattransfercoefficientinadryiceethanolcoolingbathusinganumericalapproach AT zaritzkynoemielisabet experimentaldeterminationofsurfaceheattransfercoefficientinadryiceethanolcoolingbathusinganumericalapproach AT chirifejorge experimentaldeterminationofsurfaceheattransfercoefficientinadryiceethanolcoolingbathusinganumericalapproach |
bdutipo_str |
Repositorios |
_version_ |
1764820442086899713 |