纳米流体中气体水合物生成过程的实验研究

Experimental Study on Formation Process of Gas Hydrate in Nanofluids

提出了制冷剂气体水合物在纳米流体中快速生成的设想,并通过HCFC141b气体水合物在纳米铜流体(由质量分数为0.04%的十二烷基苯磺酸钠-6(SDBS)溶液和名义直径为25 nm的纳米铜粒子组成)中的生成实验验证了此设想.实验结果表明:与去离子水中HCFC141b气体水合物的生成过程相比,纳米铜流体中的SDBS是造成HCFC141b气体水合物诱导时间明显缩短的主要原因,而纳米铜粒子对诱导时间的影响不大;纳米铜流体中SDBS的乳化作用和纳米铜粒子大的比表面积大大促进了HCFC141b在水中的溶解;纳米铜粒子的加入明显加强了HCFC141b气体水合物生成过程中的传热传质,随着纳米铜粒子粒子数的增加,HCFC141b气体水合物生成过程明显缩短.

The presumption that the refrigerant gas hydrate can be formed rapidly in nanofluids was presented. Then the experiments were conducted on the HCFCI41b gas hydrate formation process in the nanofluid comprising sodium dodecylbenzenesulfonate-6 （SDBS） solution with a mass fraction of 0. 04% and nano-copper particles with a nominal diameter of 25 nm. The results indicate that, compared with the formation process of HCFC141b hydrate in deionized water, the addition of SDBS results in much more reduction of induction time of HCFC141b gas hydrate than the addition of nano-copper does in the nanofluids. Moreover, the emulsification of SDBS and great specific surface of nano-copper particles greatly improve the solubility of HCFC141b in wa- ter. In addition, the formation process of HCFC141b gas hydrate shortens with the increasing mass fraction of nano-copper in nanofluid since the addition of nano-copper enhances the heat and mass transfer of formation of HCFC141b gas hydrate.