Comparison of heat transfer in liquid and slush nitrogen by numerical simulation of cooling rates for French straws used for sperm cryopreservation

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Slush nitrogen (SN₂) is a mixture of solid nitrogen and liquid nitrogen, with an average temperature of −207 °C. To investigate whether plunging a French plastic straw (commonly used for sperm cryopreservation) in SN₂ substantially increases cooling rates with respect to liquid nitrogen (LN₂), a num...

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Detalles Bibliográficos
Autores principales: Sansinena, Marina, Santos, María Victoria, Zaritzky, Noemí Elisabet, Chirife, Jorge
Formato: Articulo Preprint
Lenguaje:Inglés
Publicado: 2012
Materias:
Química
Cooling rate
Slush nitrogen
Heat transfer coefficient
Numerical simulation
Cryopreservation
Spermatozoa
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/128312
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-128312
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Química
Cooling rate
Slush nitrogen
Heat transfer coefficient
Numerical simulation
Cryopreservation
Spermatozoa
spellingShingle Química
Cooling rate
Slush nitrogen
Heat transfer coefficient
Numerical simulation
Cryopreservation
Spermatozoa
Sansinena, Marina
Santos, María Victoria
Zaritzky, Noemí Elisabet
Chirife, Jorge
Comparison of heat transfer in liquid and slush nitrogen by numerical simulation of cooling rates for French straws used for sperm cryopreservation
topic_facet Química
Cooling rate
Slush nitrogen
Heat transfer coefficient
Numerical simulation
Cryopreservation
Spermatozoa
description Slush nitrogen (SN₂) is a mixture of solid nitrogen and liquid nitrogen, with an average temperature of −207 °C. To investigate whether plunging a French plastic straw (commonly used for sperm cryopreservation) in SN₂ substantially increases cooling rates with respect to liquid nitrogen (LN₂), a numerical simulation of the heat conduction equation with convective boundary condition was used to predict cooling rates. Calculations performed using heat transfer coefficients in the range of film boiling confirmed the main benefit of plunging a straw in slush over LN2 did not arise from their temperature difference (−207 vs. −196 °C), but rather from an increase in the external heat transfer coefficient. Numerical simulations using high heat transfer (h) coefficients (assumed to prevail in SN₂) suggested that plunging in SN₂ would increase cooling rates of French straw. This increase of cooling rates was attributed to a less or null film boiling responsible for low heat transfer coefficients in liquid nitrogen when the straw is placed in the solid–liquid mixture or slush. In addition, predicted cooling rates of French straws in SN₂ tended to level-off for high h values, suggesting heat transfer was dictated by heat conduction within the liquid filled plastic straw.
format Articulo
Preprint
author Sansinena, Marina
Santos, María Victoria
Zaritzky, Noemí Elisabet
Chirife, Jorge
author_facet Sansinena, Marina
Santos, María Victoria
Zaritzky, Noemí Elisabet
Chirife, Jorge
author_sort Sansinena, Marina
title Comparison of heat transfer in liquid and slush nitrogen by numerical simulation of cooling rates for French straws used for sperm cryopreservation
title_short Comparison of heat transfer in liquid and slush nitrogen by numerical simulation of cooling rates for French straws used for sperm cryopreservation
title_full Comparison of heat transfer in liquid and slush nitrogen by numerical simulation of cooling rates for French straws used for sperm cryopreservation
title_fullStr Comparison of heat transfer in liquid and slush nitrogen by numerical simulation of cooling rates for French straws used for sperm cryopreservation
title_full_unstemmed Comparison of heat transfer in liquid and slush nitrogen by numerical simulation of cooling rates for French straws used for sperm cryopreservation
title_sort comparison of heat transfer in liquid and slush nitrogen by numerical simulation of cooling rates for french straws used for sperm cryopreservation
publishDate 2012
url http://sedici.unlp.edu.ar/handle/10915/128312
work_keys_str_mv AT sansinenamarina comparisonofheattransferinliquidandslushnitrogenbynumericalsimulationofcoolingratesforfrenchstrawsusedforspermcryopreservation
AT santosmariavictoria comparisonofheattransferinliquidandslushnitrogenbynumericalsimulationofcoolingratesforfrenchstrawsusedforspermcryopreservation
AT zaritzkynoemielisabet comparisonofheattransferinliquidandslushnitrogenbynumericalsimulationofcoolingratesforfrenchstrawsusedforspermcryopreservation
AT chirifejorge comparisonofheattransferinliquidandslushnitrogenbynumericalsimulationofcoolingratesforfrenchstrawsusedforspermcryopreservation
bdutipo_str Repositorios
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