Foam generation, characterization and breakup in pipes
Foam generation, characterization and breakup in pipes
复制标题
DOI：
10.1016/j.jngse.2018.06.005
复制
发表时间：
2018-08
影响因子：
--
通讯作者：
M. Karaaslan;Ramin Dabirian;R. Mohan;O. Shoham
中科院分区：
文献类型：
--
作者：
M. Karaaslan;Ramin Dabirian;R. Mohan;O. Shoham
实验利用0.025 米直径泡沫表征钻机（FCR）撬。实验中使用了水泡沫，同时使用Drill foam F-450和SI-403表面活性剂来产生泡沫。采用不同的泡沫产生装置进行泡沫产生和表征实验，以确定产生最稳定泡沫的最佳配置。泡沫质量和进口气体体积分数（IGVF）的比较表明，在90% IGVF （vsg= 0.09 m/s）时，由于在此条件下出现均匀流动，这些变量彼此接近。结果表明，2个125 μm网孔和3个 mm微球的泡沫生成结构产生的泡沫最稳定。在管道中观察到三种不同的流动模式，即分层、分散和段塞流，表现出不同的泡沫质量。泡沫在管道中的流动实验表明，气体剪切对泡沫破裂的影响取决于管道内现有的流动模式。对于分层波浪流，增加表面气速可以提高或降低泡沫破碎效率，这取决于气速。另一方面，在段塞流中，通常增加表面气速会导致泡沫破碎效率略有下降。
Experiments were conducted utilizing a 0.025 m diameter Foam Characterization Rig (FCR) skid. Aqueous foam was used in the experimental program, utilizing both Drill Foam F-450 and SI-403 surfactants to generate the foam. Foam generation and characterization experiments were conducted with different foam generation devices, with the aim of identifying the optimal configuration, which generates the most stable foam. A comparison between the foam quality and inlet gas volume fraction (IGVF) demonstrates that these variables are close to each other at 90% IGVF (vsg= 0.09 m/s) owing to the occurrence of homogenous flow for this condition. The data also confirm that the foam generation configuration with two 125 μm mesh size and 3 mm beads generates the most stable foam.Three different flow patterns were observed in the pipe, namely, stratified, dispersed and slug flow, exhibiting different foam quality. Foam flow in pipes experiments revealed that the gas shear effect on foam break-up depends on the existing flow pattern in the pipe. For stratified wavy flow, increasing the superficial gas velocity can lead to either increasing or decreasing foam breakup efficiency, which depends on the gas velocity. On the other hand, in slug flow, generally increasing the superficial gas velocity results in slightly decrease in the foam breakup efficiency.