Please use this identifier to cite or link to this item: https://repositorio.uca.edu.ar/handle/123456789/5456
Título : Comparison of heat transfer in liquid and slush nitrogen by numerical simulation of cooling rates for French straws used for sperm cryopreservation
Autor : Sansiñena, Marina Julia 
Santos, María Victoria 
Zaritzky, Noemí 
Chirife, Jorge 
Palabras clave : REFRIGERACIONNITROGENO LIQUIDOTRANSFERENCIA DE CALORSIMULACIONCONSERVACIONESPERMATOZOIDESREPRODUCCION ANIMAL
Fecha de publicación : 2011
Cita : Sansiñena, M., M.V. Santos, N. Zaritzky y J. Chirife. 2011. Comparison of heat transfer in liquid and slush nitrogen by numerical simulation of cooling rates for French straws used for sperm cryopreservation [en línea]. Preprint del documento publicado en Theriology, enero 2012 (http://dx.doi.org/10.1016/j.theriogenology.2011.10.044). Disponible en: https://repositorio.uca.edu.ar/handle/123456789/5456
Resumen : Abstract: Slush nitrogen (SN2) is a mixture of solid nitrogen and liquid nitrogen coexisting under an average temperature of -207ºC. In order to investigate whether plunging a French plastic straw (commonly used for spermatozoa cryopreservation) in SN2 may substantially increase cooling rates with respect to liquid nitrogen (LN2), a numerical simulation of the heat conduction equation with convective boundary condition was used to predict the 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 does not arise from their temperature difference (-207ºC vs. -196ºC) but 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 the low heat transfer coefficients in liquid nitrogen when the straw is placed in the solidliquid mixture or slush. In addition, it was demonstrated that predicted cooling rates of French straws in SN2 tends to level-off for high h values, suggesting heat transfer is dictated by the heat conduction within the liquid filled plastic straw
URI : https://repositorio.uca.edu.ar/handle/123456789/5456
Disciplina: INGENIERIA EN ALIMENTOS
Derechos: Acceso Abierto
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