摘要
在充分考虑油包水体系水合物生成特点的基础上,基于传热学、多相流、水合物动力学相关理论,建立了描述含水合物油包水体系流动规律的理论模型,并给出了模型的定解条件和求解方法。数值计算表明:产液量、含水率、液滴粒径均会影响水合物的生成,进而影响体系流动;当水合物的生成速率受体系提供的游离气量控制时,其值基本不变;进入水合物生成域,液滴转化为水合物颗粒并发生聚并,其量纲为一的聚并粒径在整个生成域保持恒定,且产液量越少、含水率越低、液滴粒径越小,量纲为一的聚并粒径越大;进入水合物分解区,水合物颗粒簇解体后又重新聚并,量纲为一的聚并粒径较生成域的小;水合物生成会导致体系的黏度增加,黏度增幅随水合物颗粒体积分数和量纲为一的聚并粒径的增大而增大。
According to the hydrate formation characteristics in water/oil emulsion system,the theoretical model describing the flow behavior of water/oil emulsion by considering hydrate transition is developed by the theory of heat transfer,multiphase flow and hydrate dynamics.The definite condition and iterative steps are imposed to solve the problem.Numerical simulation shows that liquid output,water cut and droplet size can affect the formation of hydrate and subsequently affect the flow behavior of system.The hydrate formation rate will be constant when it is controlled by the free gas volume of the system.In hydrate formation domain,droplets transform into hydrate particles and then agglomerate,the non-dimensional diameter of hydrate agglomeration keeps constant in the whole hydrate formation region and it will be greater when the liquid output becomes less,the water cut becomes lower and the droplet size becomes smaller.In hydrate decomposition domain,hydrate particle clusters breakup and hydrate particles agglomerate again,while the particle agglomerate sizes become smaller.The formation of hydrate will lead to the increase of system viscosity and the viscosity amplification increase with the increasing of hydrate particle volume fraction and non-dimensional agglomeration diameter.
出处
《应用力学学报》
CAS
CSCD
北大核心
2013年第4期574-580,649,共7页
Chinese Journal of Applied Mechanics
基金
国家自然基金(51004113)
中央高校基本科研业务费专项资金(09CX0416A)
关键词
油包水乳状液
水合物动力学
液滴粒径
颗粒聚并
量纲为一的聚并粒径
water/oil emulsion
hydrate dynamics
droplets size
particles agglomerate
non-dimensional agglomeration diameter.
