Experimental study on the flow and heat transfer characteristics of a tetra-n-butyl ammonium bromide hydrate slurry (second report: Heat transfer characteristics)
Experimental study on the flow and heat transfer characteristics of a tetra-n-butyl ammonium bromide hydrate slurry (second report: Heat transfer characteristics)
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DOI：
10.1016/j.ijrefrig.2011.06.003
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发表时间：
2011-12
期刊：
影响因子：
--
通讯作者：
H. Kumano;T. Hirata;Tomoya Kudoh
中科院分区：
文献类型：
--
作者：
H. Kumano;T. Hirata;Tomoya Kudoh
研究了以雷诺数、管径和固相分数为实验参数的四正丁基溴化铵水合物浆料的传热特性。对于层流，努塞尔数的比值随固体分数的增加而增加。在表观雷诺数、固体分数和水合物颗粒平均直径与试管直径之比的基础上，可以用Graetz数推导出努塞尔数的近似。对于湍流条件，在低固体分数条件下，努塞尔数的比值为1。在高固相分数区，努塞尔数比值随固相分数的增加而增加。此外，将水合物浆体视为假塑性流体而得到的表观雷诺数可用于确定湍流作用下水合物浆体换热特性变化的条件。
The heat transfer characteristics of a tetra-n-butyl ammonium bromide hydrate slurry were investigated where the Reynolds number, tube diameters and solid fraction were varied as experimental parameters. For laminar flow, it was found that the ratio of Nusselt numbers increased with solid fraction. An approximation of Nusselt number could be derived using the Graetz number on the basis of the apparent Reynolds number, the solid fraction and the ratio of the average diameter of the hydrate particles to the test tube diameter. For turbulent flow conditions, the ratio of Nusselt numbers had a value of one for each condition at low solid fractions. The ratio of Nusselt numbers increased with solid fraction in the high solid fraction region. Moreover, the apparent Reynolds number, which can be derived by treating the hydrate slurry as a pseudoplastic fluid, can be used to determine the condition under which hydrate slurry heat transfer characteristics vary under turbulent flow.