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进气方向对文丘里微气泡发生器气泡直径的影响 被引量:3

Effect of Bubble Intake Direction on Bubble Diameters Generated by a Venturi Microbubble Generator
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摘要 文丘里微气泡发生装置常采用自吸式进气的方式,在工程应用中可能存在微气泡通量不足的问题。采用压缩空气进气,并通过照相法重点考察了错流、逆流和并流3种进气方向对文丘里管微气泡发生器生成气泡直径的影响。结果表明:喉管处液速超过4.72 m/s时所产生的湍流剪切场才能将进入的气泡破碎成~200μm级别的微气泡;添加3-戊醇能够稳定生成的微气泡,抑制生成的气泡在从文丘里管到测试槽表面逸出过程中的聚并和破碎过程,从而使测试槽中不同位置处气泡直径能保持生成时的微气泡的直径;3种进气方向中,错流进气因气泡进入后更贴近壁面流动,所生成气泡直径最大;而并流进气气泡脱离时间更短,使得生成气泡尺寸最小。在相同条件下,并流进气生成的微气泡比表面积最大,约是错流进气的3倍,最有利于气液传质。 The self-suction method was often adopted to feed bubbles to the Venturi microbubble generator, which could lead to insufficient flux ofmicrobubbles in engineering applications.In this paper, the compressed air was used to replace the self-suction method, the effect of three bubble intake directions (cross-current, co-current and contra-current) on the bubble diameters generated by a Venturi microbubble generator was investigated by photographic method.The results show that the critical liquid flow rate at the throat is about 4.72 m/s to generate an intensive turbulent shear field to break bubbles into microbubbles (-200 μm) ;3-amyl alcohol can stable the microbubbles by restraining the processes of coalescence and breakup as the bubbles generated in the Venturi tube flowed to test tank.Thus,bubble diameters at different positions of the test tank can keep the same.In the case of cross-current, bubbles were closer to the wall where the turbulent shear was weaker, which led to greater bubble diameters.The bubble detachment time of the co-current was shorter than that of the contra-current under the same conditions, which led to minimum bubble sizes.The specific surface area is the greatest in the case of co-current and about 3 times of cross-current, which is very advantageous to gas-liquid mass transfer.
出处 《黄金科学技术》 CSCD 2017年第5期127-134,共8页 Gold Science and Technology
基金 国家重点研发计划项目"多相氧化组合反应器与耦合分离新技术"(编号:2016YFB0301701) 国家重大科研仪器设备研制专项"新型生物冶金测试反应器及气液固三相流测量仪器研制"(编号:21427814) 国家自然科学基金项目"微生物硫化浮选低品位氧化型镍矿界面作用研究"(编号:21306225) 国家自然科学基金重大研究计划"微气泡(群)生成的介尺度机理及工业微气泡发生器科学基础"(编号:91534117) 中国科学院前沿科学重点研究项目"多晶型药物结晶过程调控和反应结晶器放大"(编号:QYZDJ-SSWJSC030)联合资助
关键词 微气泡 文丘里 照相法 进气方向 气泡直径 比表面积 microbubble Venturi tube photographic method bubble intake direction bubble diameter specific surface area
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