Conjugated heat and mass transfer during flow melting of a phase change material slurry in pipes
Conjugated heat and mass transfer during flow melting of a phase change material slurry in pipes
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DOI：
10.1016/j.energy.2016.01.033
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发表时间：
2016-03
期刊：
影响因子：
9
通讯作者：
X. Shi;Pengfei Zhang
中科院分区：
文献类型：
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作者：
X. Shi;Pengfei Zhang
PCS（相变材料浆料）对于热能存储是非常有用的。四丁基溴化铵（TBAB）CHS（Clathrate Hydrate Slurry）是由四丁基溴化铵水合物晶体和四丁基溴化铵水溶液组成的一种很有发展前途的PCS。本文对TBAB型CHS在圆管中的流动熔化特性进行了数值研究。采用欧拉-欧拉多相流模型对TBAB CHS的固液两相特性进行了数值研究。考虑相变现象，对TBAB水合物晶体与水溶液之间的相间热质交换进行了数值模拟。此外，还对TBAB盐（溶质）在TBAB水溶液中的扩散进行了数值研究。计算结果表明，由于潜热的存在，液体温度的上升速度比固体温度的上升速度快。此外，局部换热系数降低，在热充分发展的区域，因为壁面和流体之间的温差增加。当固体颗粒几乎完全熔化时，由于没有相变，流体温度比壁面温度上升得更快，导致局部传热系数增加。
PCS (phase change materials slurries) are very useful for thermal energy storage. TBAB (tetra-n-butyl ammonium bromide) CHS (clathrate hydrate slurry) is a promising PCS, which is composed of TBAB hydrate crystal and TBAB aqueous solution. In the present study, the flow melting characteristics of TBAB CHS through pipes were numerically investigated. The solid–liquid two-phase nature of TBAB CHS was numerically investigated using the Eulerian–Eulerian multiphase model. And the interphase heat and mass exchange between TBAB hydrate crystals and TBAB aqueous solution was numerically modeled by considering the phase change phenomenon. Moreover, the diffusion of TBAB salt (solute) in TBAB aqueous solution was also numerically investigated. The numerical results showed that the liquid temperature increased more quickly than the solid temperature because of the latent heat involved. Moreover, the local heat transfer coefficient decreased in the thermally fully-developed region because of the increasing temperature difference between the wall and fluid. When the solid particles were almost fully melted, the fluid temperature increased more quickly than the wall temperature due to the absence of phase change, resulting in the increase of the local heat transfer coefficient.