Heat transfer performance and melting dynamic of a phase change material subjected to thermocapillary effects

Madruga Sanchez, Santiago and Mendoza, Carolina (2017). Heat transfer performance and melting dynamic of a phase change material subjected to thermocapillary effects. "International Journal of Heat and Mass Transfer", v. 109 ; pp. 501-510. ISSN 0017-9310. https://doi.org/10.1016/j.ijheatmasstransfer.2017.02.025.

Description

Title: Heat transfer performance and melting dynamic of a phase change material subjected to thermocapillary effects
Author/s:
  • Madruga Sanchez, Santiago
  • Mendoza, Carolina
Item Type: Article
Título de Revista/Publicación: International Journal of Heat and Mass Transfer
Date: June 2017
ISSN: 0017-9310
Volume: 109
Subjects:
Freetext Keywords: Marangoni; Phase Change Material; Microgravity; Energy storage; Melting
Faculty: E.T.S. de Ingeniería Aeronáutica y del Espacio (UPM)
Department: Matemática Aplicada a la Ingeniería Aeroespacial
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

We carry out extensive numerical simulations on the melting of the Phase Change Material n-octadecane subjected to thermocapillary driving at a free surface on geometries with the form of circular sections of radius in order of centimeters. Simulations employ Stefan numbers Ste=0.22 and Ste=0.67. We compare the heat transfer performance with melting induced only by conduction and find a reduction of melting times by thermocapillarity up to a factor five for semicircular geometries. As a consequence, we propose the use of this mechanism in applications of thermoregulation in microgravity that require fast charge and discharge cycles. We show how a longer free surface enhances the effect of thermocapillarity on the heat transfer performance due to a greater contact area of solid PCM with regions of melted PCM dominated by thermocapillary flows. The length of the free surface has more impact on the heat transfer performance than the contact area between PCM and heat source in the geometries studied in this work. Besides, we observe as well how greater thermal gradients for higher Stefan number augment the importance of thermocapillary effects on the heat transfer performance.

Funding Projects

TypeCodeAcronymLeaderTitle
Government of SpainTRA2013-45808-RUnspecifiedUnspecifiedUnspecified
Government of SpainESP2013-45432-PUnspecifiedUnspecifiedUnspecified
Government of SpainESP2015-70458-PUnspecifiedUnspecifiedUnspecified
Government of SpainMTM2014-56392-RUnspecifiedUnspecifiedUnspecified

More information

Item ID: 50098
DC Identifier: http://oa.upm.es/50098/
OAI Identifier: oai:oa.upm.es:50098
DOI: 10.1016/j.ijheatmasstransfer.2017.02.025
Official URL: https://www.sciencedirect.com/science/article/pii/S0017931016327624
Deposited by: Memoria Investigacion
Deposited on: 02 Aug 2018 10:08
Last Modified: 02 Aug 2018 10:08
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