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Experimental comparative analysis of close-contact and constrained melting of n-eicosane in a finned rectangular cavity
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.ORCID iD: 0000-0002-8059-1546
KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
2023 (English)In: Applied Thermal Engineering, ISSN 1359-4311, E-ISSN 1873-5606, Vol. 219, article id 119677Article in journal (Refereed) Published
Abstract [en]

The present study demonstrates and visualizes the two modes of constrained melting and close-contact melting in a rectangular cavity enhanced with fins. Three configurations of fin with different lengths and numbers are tested in different horizontal, inclined, and vertical orientations. N-eicosane is used as the phase change material, and the experiments are performed with water as the heat transfer fluid at the inlet conditions of 50 degrees C, 55 degrees C, and 60 degrees C. In general, the close-contact melting time is shorter by 42-50%, compared to the convection dominated constrained melting in the unenhanced cavity without fins. By using fins to enhance the process, the melting time is reduced by 49% and 35% in the constrained and the close-contact modes, respectively, compared to the unfinned cavity in each mode. The thermal performance is observed to be superior in the horizontal and the inclined orientations. In these orientations, the buoyancy-driven structures are not blocked by fins in the con-strained mode. In the close-contact mode, the solid specimens attain more consistent contact with the base of the cavity and with the extended heat transfer area at the inclined and horizontal conditions. In the vertical orientation, the asymmetrical melting by the fins results in a rotational movement of the solid PCM and close -contact perturbations. The variations in the number of fins are found to have minor effects on the overall close-contact-induced melting. On the other hand, increasing the length of the fins is a more promising measure, providing consistent and prolonged contact.

Place, publisher, year, edition, pages
Elsevier BV , 2023. Vol. 219, article id 119677
Keywords [en]
Melting, Rectangular, Constrained, Close-contact, Fin
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-322876DOI: 10.1016/j.applthermaleng.2022.119677ISI: 000893113400002Scopus ID: 2-s2.0-85142471619OAI: oai:DiVA.org:kth-322876DiVA, id: diva2:1724610
Note

QC 20230109

Available from: 2023-01-09 Created: 2023-01-09 Last updated: 2023-01-09Bibliographically approved

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Abdi, AmirRastan, Hamidreza

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