RHEOLOGICAL STUDY ON TETRA-N-BUTYL AMMONIUM SALT SEMI-CLATHRATE HYDRATE SLURRIES
RHEOLOGICAL STUDY ON TETRA-N-BUTYL AMMONIUM SALT SEMI-CLATHRATE HYDRATE SLURRIES
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DOI：
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发表时间：
2011
影响因子：
2.9
通讯作者：
S. Hashimoto;K. Kawamura;Hiroyuki Ito;Masahiro Nobeoka;K. Ohgaki;Y. Inoue
中科院分区：
文献类型：
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作者：
S. Hashimoto;K. Kawamura;Hiroyuki Ito;Masahiro Nobeoka;K. Ohgaki;Y. Inoue
最近，具有潜热的相变材料（以下简称PCM）的浆料作为高密度热传输系统而受到广泛关注。迄今为止，有报道称，含有四正丁基铵盐溶液及其半笼形水合物：四正丁基溴化铵（TBAB）和氟化铵（TBAF）作为潜热传输介质的浆料的热性能良好。在本研究中，使用具有平行板装置的应力控制型流变仪测量了不同浓度溶液下的TBAB或TBAF溶液及其水合物浆料的粘度特性。溶液和水合物浆料的表观粘度都随着温度的降低而增加，这可能是由于溶液中固体（水合物颗粒）分数的增加引起的。水合物浆液表现出类似假塑性流体的行为。尽管 TBAB 和 TBAF 水合物之间的晶胞结构不同，但这些水合物浆料的粘度特性可以仅使用固体部分来处理。此外，极少量的表面活性剂会大大降低水合物浆料的表观粘度，这可能是由表面活性剂吸附的水合物颗粒的电排斥引起的。
Recently, slurries with phase change materials (hereafter, PCM) having latent heat have been received much attention as a high-density heat transportation system. So far, it has been reported that the thermal ability of slurries containing tetra-n-butyl ammonium salt solutions and their semi-clathrate hydrate: tetra-n-butyl ammonium bromide (TBAB) and fluoride (TBAF) as latent heat transport media is favorable. In the present study, the viscosity characteristics of TBAB or TBAF solutions and their hydrate-slurries were measured at various concentrations of solutions by use of a stress-control-type rheometer with parallel-plate device. The apparent viscosity of both solution and hydrate slurries increases as the temperature decreases, which may be caused by the increase of solid (hydrate particle) fraction in solution. The hydrate slurries exhibit the behavior like pseudo-plastic fluid. The viscosity characteristics of these hydrate slurries can be treated by use of only solid fraction despite different unit-cell structure between TBAB and TBAF hydrates. In addition, a very small amount of surfactant drastically reduces the apparent viscosity of hydrate slurries, which may be caused by the electric repulsion of surfactant-adsorbed hydrate particles.