Rheological study of mixed cyclopentane + CO2 hydrate slurry in a dynamic loop for refrigeration systems
Rheological study of mixed cyclopentane + CO2 hydrate slurry in a dynamic loop for refrigeration systems
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DOI：
10.1016/j.energy.2022.125661
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发表时间：
2022-10
期刊：
影响因子：
9
通讯作者：
N. Chami;Y. Salehy;Dennis Burgner;P. Clain;D. Dalmazzone;A. Delahaye;L. Fournaison
中科院分区：
文献类型：
--
作者：
N. Chami;Y. Salehy;Dennis Burgner;P. Clain;D. Dalmazzone;A. Delahaye;L. Fournaison
CO2水合物作为相变材料用于二次循环制冷是有希望的，因为这些化合物呈现可调节的解离温度，可以高于273.15 K，并且具有高的解离焓。在本工作中，通过使用各种促进剂，环戊烷（CP）在本研究中，水合物的形成压力可能会显着低于CO2水合物。为了将CP + CO2水合物混合物用作制冷剂，需要对混合物的流变性能进行控制。采用毛细管粘度计，基于Rabinowitch和Mooney方程，研究了环戊烷含量为3 ~ 15wt%时，CP和CP + CO2水合物混合浆体的流动特性。比较了与这两种浆料相关的流变参数（粘度、流动行为...）。实验结果表明，CP和混合CP + CO2水合物浆料表现出剪切稀化行为，CP水合物浆料在[100-1000 s-1]下的粘度值在3和12 mPa.s-1之间变化，CP + CO2水合物浆料在[100-1200 s-1]下的粘度值在2和10 mPa. s-1之间变化。CP水合物和CP + CO2水合物浆体的粘度与TBPB水合物浆体的粘度接近，低于CO2水合物浆体的粘度。CP + CO2混合体系的流变性随时间变化。
The use of CO2hydrates as phase change materials is promising for secondary loop refrigeration, as these compounds present adjustable dissociation temperature that can be higher than 273.15 K and have high enthalpy of dissociation. In the present work, by using various promoters, cyclopentane (CP) in this study, the formation pressure of hydrates may be significantly lowered than CO2hydrates. For their application as a secondary refrigerant, the rheological properties of mixed CP + CO2hydrate slurry need to be controlled. The flow properties of CP and mixed CP + CO2hydrate slurries were studied in a dynamic flow loop at different cyclopentane contents ranging from 3 wt% to 15 wt%, using a capillary viscometer based on Rabinowitch and Mooney equation. Rheological parameters (viscosity, flow behavior…) related to these two slurries were compared. The experimental results demonstrate that CP and mixed CP + CO2hydrates slurries exhibit a shear thinning behavior and the viscosity values vary between 3 and 12 mPa.s-1 at [100–1000 s−1] for CP hydrates slurries and between 2 and 10 mPa s−1at [100–1200 s−1] for CP + CO2hydrates slurries. CP hydrate and CP + CO2 hydrate slurry viscosity is close to that of TBPB hydrate and lower than that of CO2hydrate. Moreover, mixed CP + CO2have shown a time-evolution of the rheological behavior.