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<p>The present study examines phase change material (PCM) melting in finned enclosures under normal (1&#xa0;g) and hypergravity conditions (5&#xa0;g and 10&#xa0;g), with particular attention to fin number and placement while maintaining constant fin area. This analysis is relevant to thermal management in aerospace and rotating systems, where fin design may influence melting behavior and heat-transfer performance. A comparative analysis of single-, double-, and triple-fin configurations is carried out for latent heat thermal energy storage (LHTES) systems under hypergravity. The results indicate that fin configuration influences melting dynamics. A single longer fin placed in the lower region shows the best performance among the cases considered, associated with enhanced buoyancy-driven convection, whereas multiple shorter fins or upper fin placement may suppress fluid motion and reduce heat-transfer effectiveness. Under hypergravity, melting is accelerated, with melting time reduced by up to 47.8% and 48.2% at 5&#xa0;g and 10&#xa0;g, respectively, compared to the case without fins. This behavior is associated with an increase in Rayleigh number and flow intensity, reflected by a 3–5 times increase in maximum velocity magnitude. Although total stored energy decreases slightly (0.38–1.32%) due to reduced PCM volume, mean power increases significantly (up to 90.8%). However, a reduction in energy storage density (about 7.5%) indicates a trade-off between storage capacity and heat-transfer performance. The findings provide insight into LHTES behavior under the conditions considered, with possible relevance to aerospace applications.</p>

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Impact of Multiple Fins on the Melting Characteristics of PCM in a Closed Enclosure Under Hypergravity Conditions

  • 期刊论文

  • 发表日期：

    2026年6月30日

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  • Dixit Arya,
  • Nisha Netam,
  • Anuj Kumar Shukla

摘要

The present study examines phase change material (PCM) melting in finned enclosures under normal (1 g) and hypergravity conditions (5 g and 10 g), with particular attention to fin number and placement while maintaining constant fin area. This analysis is relevant to thermal management in aerospace and rotating systems, where fin design may influence melting behavior and heat-transfer performance. A comparative analysis of single-, double-, and triple-fin configurations is carried out for latent heat thermal energy storage (LHTES) systems under hypergravity. The results indicate that fin configuration influences melting dynamics. A single longer fin placed in the lower region shows the best performance among the cases considered, associated with enhanced buoyancy-driven convection, whereas multiple shorter fins or upper fin placement may suppress fluid motion and reduce heat-transfer effectiveness. Under hypergravity, melting is accelerated, with melting time reduced by up to 47.8% and 48.2% at 5 g and 10 g, respectively, compared to the case without fins. This behavior is associated with an increase in Rayleigh number and flow intensity, reflected by a 3–5 times increase in maximum velocity magnitude. Although total stored energy decreases slightly (0.38–1.32%) due to reduced PCM volume, mean power increases significantly (up to 90.8%). However, a reduction in energy storage density (about 7.5%) indicates a trade-off between storage capacity and heat-transfer performance. The findings provide insight into LHTES behavior under the conditions considered, with possible relevance to aerospace applications.