以委内瑞拉超重油和新疆风城超重油为研究对象,进行了超声辅助降粘的研究。在实验中,制备了两类四种实验样品:分别掺入20%和30%柴油的两种委内瑞拉超重油样品、在O/W降粘体系下制备的委内瑞拉超重油样品和风城超重油样品。使用频率为18 ...以委内瑞拉超重油和新疆风城超重油为研究对象,进行了超声辅助降粘的研究。在实验中,制备了两类四种实验样品:分别掺入20%和30%柴油的两种委内瑞拉超重油样品、在O/W降粘体系下制备的委内瑞拉超重油样品和风城超重油样品。使用频率为18 k Hz的超声变幅杆和24 k Hz的超声清洗槽对上述四种实验样品进行超声处理,结果表明:1)对掺入20%和30%柴油的委内瑞拉超重油,经过超声处理的超重油样品在20℃时粘度分别增高了25%和15%以上;2)在O/W降粘体系超重油降粘中,风城超重油样品经过超声作用后,在20℃粘度降低了25%以上,而降粘剂的使用量可减少20%,超声辅助降粘效果明显;3)在O/W降粘体系超重油降粘中,委内瑞拉超重油样品经过超声处理后,在14℃时,超声处理过的样品的粘度降低不高于25%,在高于这一温度的情况下则未观察到明显的粘度降低。文中对上述实验结果产生的原因进行了定性的分析。展开更多
We have been using the method of tube-arrest as a means of producing transient single cavitation bubble. In the present paper we seek to comprehend the mechanism of production and inquire into the structure of the ab ...We have been using the method of tube-arrest as a means of producing transient single cavitation bubble. In the present paper we seek to comprehend the mechanism of production and inquire into the structure of the ab initio pressure field in the arrested liquid column. The generated pressure wave is shown by combining the theoretical analysis with the experimental observation to be a slightly varied version of water hammer. With relatively clean liquid, the magnitude of the tension peak generating the TSB is likely to reach of several millions Pa. It is also shown that the so generated cavitation bubble originating from the gas-containing bulk liquid is in ‘violent’ motion.展开更多
文摘以委内瑞拉超重油和新疆风城超重油为研究对象,进行了超声辅助降粘的研究。在实验中,制备了两类四种实验样品:分别掺入20%和30%柴油的两种委内瑞拉超重油样品、在O/W降粘体系下制备的委内瑞拉超重油样品和风城超重油样品。使用频率为18 k Hz的超声变幅杆和24 k Hz的超声清洗槽对上述四种实验样品进行超声处理,结果表明:1)对掺入20%和30%柴油的委内瑞拉超重油,经过超声处理的超重油样品在20℃时粘度分别增高了25%和15%以上;2)在O/W降粘体系超重油降粘中,风城超重油样品经过超声作用后,在20℃粘度降低了25%以上,而降粘剂的使用量可减少20%,超声辅助降粘效果明显;3)在O/W降粘体系超重油降粘中,委内瑞拉超重油样品经过超声处理后,在14℃时,超声处理过的样品的粘度降低不高于25%,在高于这一温度的情况下则未观察到明显的粘度降低。文中对上述实验结果产生的原因进行了定性的分析。
基金supported by the National Natural Science Foundation of China (Grant No 10434070)
文摘We have been using the method of tube-arrest as a means of producing transient single cavitation bubble. In the present paper we seek to comprehend the mechanism of production and inquire into the structure of the ab initio pressure field in the arrested liquid column. The generated pressure wave is shown by combining the theoretical analysis with the experimental observation to be a slightly varied version of water hammer. With relatively clean liquid, the magnitude of the tension peak generating the TSB is likely to reach of several millions Pa. It is also shown that the so generated cavitation bubble originating from the gas-containing bulk liquid is in ‘violent’ motion.
