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首页> 外文期刊>Journal of Energy Storage >An experimental and numerical study on effect of longitudinal finned tube eccentric configuration on melting behaviour of lauric acid in a horizontal tube-in-shell storage unit
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An experimental and numerical study on effect of longitudinal finned tube eccentric configuration on melting behaviour of lauric acid in a horizontal tube-in-shell storage unit

机译：纵向翅片管偏心配置对水平管壳储存单元熔化行为对纵向壳储存单元熔化行为的实验研究和数值研究

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摘要

Melting characteristics of lauric acid in a horizontal shell and finned tube-type storage unit has been studied numerically and experimentally. The low thermal conducive nature of phase change materials (PCMs) have preeminently constricted the advantage of such storage systems for various applications hence an attempt has been made to provide the finned tube in the storage container to enhance the heat transfer rate between the heat transfer fluid (HTF) and PCM for three different eccentric position (e = 12 mm, 18 mm and 24 mm) of a finned HTF tube from the centre of outer tube in concentric configuration (e = 0 mm). The present work aims on the use of minimum fin length by covering 36% of the annular length of a concentric arrangement for enhancing the melting rate of a phase change material (PCM) particularly to increase the natural convection effects besides sustaining the conduction effects. The melting rate of PCM in an annular is analysed with different angles of 60 degrees, 120 degrees and 180 degrees between fins in the bottom annulus of the storage unit at different eccentric positions of the inner tube. The results obtained through numerical calculations are found in agreement with experimental results. The enhancement in the melting rate of PCM has been examined and it has been found that the melting rate is 21% higher at the maximum eccentric annulus as compared to the concentric configuration due to enhanced domination area for natural convection effects which also increases the uniformity in temperature distribution in PCM. The eccentric behaviour for the enhancement of melting performance has been effectively achieved in the fin configuration having an angle of 60 degrees between the fins in the bottom annulus. It has been observed that the increase in Stefan number enhances the melting rate of PCM irrespective of the eccentric position of the inner tube and the heat storage rate in an eccentric annulus is 18.7% higher in comparison to the concentric annulus.
机译：在数值和实验上研究了水平壳体和翅片管式储存单元中月桂酸的熔化特性。相变材料（PCM）的低热有限性（PCM）已经克服了这种存储系统的优点，因此已经尝试提供储存容器中的翅片管以增强传热流体之间的传热速率（HTF）和PCM用于三个不同的偏心位置（E = 12mm，18mm，24mm）的翅片管中的翅片式HTF管，以同心配置（E = 0 mm）。本作者旨在通过覆盖最小翅片长度，通过覆盖同心布置的环形长度的36％，以提高相变材料（PCM）的熔化速率，特别是在维持导电效应之外增加自然对流效果。在存储单元的底部环的底部环绕在内管的不同偏心位置的翅片之间的不同角度，在环形中的熔化速率以不同的60度，120度和180度分析。通过数值计算获得的结果与实验结果一致地发现。已经研究了PCM熔化速率的增强，并且已经发现，与同心配置相比，由于具有增强的自然对流效应的统治性区域，熔融率在最大偏心环上升高21％，这也增加了均匀性PCM中的温度分布。在底部环中的翅片之间的角度为60度的翅片结构中有效地实现了用于增强熔化性能的偏心行为。已经观察到，斯特凡数的增加增强了PCM的熔化速率，而不管内管的偏心位置，与同心环相比，偏心环处的偏心环中的蓄热速率为18.7％。

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