The objective of this work is to analyze the lauric acid PCM melting process in a finned rectangular cavity, keeping both the PCM mass and the total fin area constant, thus changing only the fin aspect ratio. The analysis was conducted through a parametric study of 78 different fin configurations. In order to maintain the thermal capacity, the cavity and fin areas were kept constant while fin dimensions were varied within a preset number of combinations of area fraction and width. The fins tested were combinations of 9 fin aspect ratios (RAf) and 9 finto- cavity area fractions (ϕ). A finite-volume numerical CFD method was used to obtain the results. Governing equations were the conservation of mass, momentum and energy while phase change was governed by an enthalpy-porosity model. The mathematical model was validated against reference experimental results and computational meshes were checked with GCI. For all tested cases, with an increase in the fin length and a consequent reduction in RAf, there was a reduction of the total time of the melting process. The RAf, which had shorter melting times, were defined as optimal aspect ratios (RAopt). Thus, each ϕ tested resulted in its own RAopt. For ϕ = 0.005, 0.01, 0.02, 0.03, 0.04, 0.05, 0.1, 0.2 and 0.3, RAopt = 0.013, 0.026, 0.052, 0.078, 0.104, 0.130, 0.260, 0.592 and 0.889, respectively. Future works could contemplate a greater number of fins, with the same total area of this study, other PCM and other temperature differences, for example.

Design of fin structures for phase change material (PCM) melting process in rectangular cavities

Cesare Biserni;
2021

Abstract

The objective of this work is to analyze the lauric acid PCM melting process in a finned rectangular cavity, keeping both the PCM mass and the total fin area constant, thus changing only the fin aspect ratio. The analysis was conducted through a parametric study of 78 different fin configurations. In order to maintain the thermal capacity, the cavity and fin areas were kept constant while fin dimensions were varied within a preset number of combinations of area fraction and width. The fins tested were combinations of 9 fin aspect ratios (RAf) and 9 finto- cavity area fractions (ϕ). A finite-volume numerical CFD method was used to obtain the results. Governing equations were the conservation of mass, momentum and energy while phase change was governed by an enthalpy-porosity model. The mathematical model was validated against reference experimental results and computational meshes were checked with GCI. For all tested cases, with an increase in the fin length and a consequent reduction in RAf, there was a reduction of the total time of the melting process. The RAf, which had shorter melting times, were defined as optimal aspect ratios (RAopt). Thus, each ϕ tested resulted in its own RAopt. For ϕ = 0.005, 0.01, 0.02, 0.03, 0.04, 0.05, 0.1, 0.2 and 0.3, RAopt = 0.013, 0.026, 0.052, 0.078, 0.104, 0.130, 0.260, 0.592 and 0.889, respectively. Future works could contemplate a greater number of fins, with the same total area of this study, other PCM and other temperature differences, for example.
Rejane De Cesaro Oliveski; Fabio Becker; Luiz Alberto Oliveira Rocha; Cesare Biserni; Gabriel Eduardo Strohm Eberhardt
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/818989
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