| dc.creator | Santos, María Victoria | |
| dc.creator | Sansinena, Marina | |
| dc.creator | Zaritzky, Noemí Elisabet | |
| dc.creator | Chirife, Jorge | |
| dc.date | 2017 | |
| dc.date | 2020-09-01T18:20:33Z | |
| dc.date.accessioned | 2023-07-14T21:48:56Z | |
| dc.date.available | 2023-07-14T21:48:56Z | |
| dc.identifier | http://sedici.unlp.edu.ar/handle/10915/103587 | |
| dc.identifier | issn:1742-0644 | |
| dc.identifier.uri | https://repositorioslatinoamericanos.uchile.cl/handle/2250/7444512 | |
| dc.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. | |
| dc.description | Centro de Investigación y Desarrollo en Criotecnología de Alimentos | |
| dc.format | application/pdf | |
| dc.format | 119-124 | |
| dc.language | en | |
| dc.rights | http://creativecommons.org/licenses/by-nc-sa/4.0/ | |
| dc.rights | Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) | |
| dc.subject | Química | |
| dc.subject | Heat transfer coefficient | |
| dc.subject | Dry ice-ethanol cooling bath | |
| dc.subject | Unsteady state heat conduction | |
| dc.title | Experimental determination of surface heat transfer coefficient in a dry ice-ethanol cooling bath using a numerical approach | |
| dc.type | Articulo | |
| dc.type | Articulo | |
