滴状向射流模式转变的试验研究
O358; 液体通过内径细小的喷嘴或孔口排到周围介质中,当出口压力或流量增大时,液体在毛细管末端出流的模式将从周期滴状(PD)向混乱状态(DF)再向射流状态(J)进行转变.通过改变注射泵的流量,运用高速数码相机分别记录了去离子水和无水乙醇毛细管雾化的3种典型雾化状态(滴状、混乱、射流),获得雾化状态转变时的临界韦伯数,结果表明:在周期滴落过程中,随着孔口内径增加,液滴的形态会由球形逐渐变为梨形;随着流量的增加,两种流体均从滴状模式经过混乱状态,逐渐到达射流模式;与去离子水相比不同的是,无水乙醇的过渡状态存在范围较小,只存在于内径为0.33～0.60 mm,并且极易从周期滴状模式直接过渡到射流模...
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| Published in | 江苏大学学报（自然科学版） Vol. 45; no. 5; pp. 544 - 550 |
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| Main Authors | , , , , , |
| Format | Journal Article |
| Language | Chinese |
| Published |
江苏大学能源与动力工程学院,江苏镇江 212013%莱宝(天津)国际贸易有限公司,天津 300000
01.09.2024
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| Subjects | |
| Online Access | Get full text |
| ISSN | 1671-7775 |
| DOI | 10.3969/j.issn.1671-7775.2024.05.007 |
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| Abstract | O358; 液体通过内径细小的喷嘴或孔口排到周围介质中,当出口压力或流量增大时,液体在毛细管末端出流的模式将从周期滴状(PD)向混乱状态(DF)再向射流状态(J)进行转变.通过改变注射泵的流量,运用高速数码相机分别记录了去离子水和无水乙醇毛细管雾化的3种典型雾化状态(滴状、混乱、射流),获得雾化状态转变时的临界韦伯数,结果表明:在周期滴落过程中,随着孔口内径增加,液滴的形态会由球形逐渐变为梨形;随着流量的增加,两种流体均从滴状模式经过混乱状态,逐渐到达射流模式;与去离子水相比不同的是,无水乙醇的过渡状态存在范围较小,只存在于内径为0.33～0.60 mm,并且极易从周期滴状模式直接过渡到射流模式;去离子水和无水乙醇雾化模式转变的差异是两种流体的表面张力不同所致,其滴状到射流模式转变对应的临界韦伯数能够实现雾化模式转换过程的预测. |
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| AbstractList | O358; 液体通过内径细小的喷嘴或孔口排到周围介质中,当出口压力或流量增大时,液体在毛细管末端出流的模式将从周期滴状(PD)向混乱状态(DF)再向射流状态(J)进行转变.通过改变注射泵的流量,运用高速数码相机分别记录了去离子水和无水乙醇毛细管雾化的3种典型雾化状态(滴状、混乱、射流),获得雾化状态转变时的临界韦伯数,结果表明:在周期滴落过程中,随着孔口内径增加,液滴的形态会由球形逐渐变为梨形;随着流量的增加,两种流体均从滴状模式经过混乱状态,逐渐到达射流模式;与去离子水相比不同的是,无水乙醇的过渡状态存在范围较小,只存在于内径为0.33～0.60 mm,并且极易从周期滴状模式直接过渡到射流模式;去离子水和无水乙醇雾化模式转变的差异是两种流体的表面张力不同所致,其滴状到射流模式转变对应的临界韦伯数能够实现雾化模式转换过程的预测. |
| Abstract_FL | The liquid is discharged into the surrounding atmospheric environment through the nozzle or orifice with small inner diameter.When the outlet pressure or flow is increased,the flow mode of the liquid at the end of the capillary can change from periodic dripping(PD)to dripping faucet(DF)with latter jetting(J).Through changing the flow rate,three typical atomization modes of PD,DF and J for deionized water and ethanol were recorded by high-speed digital camera,and the critical Weber number of the transition of atomization mode was obtained.The results show that in the process of PD,the shape of droplets is gradually changed from spherical to pear-shape with the increasing of outer diameter of the orifice.As the flowrate is increased,two liquids are gradually reached the jetting regime from the dripping mode through the dripping faucet.Compared with deionized water,the transition of ethanol exists in small range and only in the inner diameter of 0.33-0.60 mm,and it is very easy to transition directly from periodic dripping to jetting regime.The difference of atomization mode transition between deionized water and absolute ethanol is caused by the different surface tension.The critical Weber number corresponding to the transition from dripping to jetting mode can realize the prediction of the atomization mode transition process. |
| Author | 李彬 孔茜 王贞涛 李睿 薛佳怡 杨诗琪 |
| AuthorAffiliation | 江苏大学能源与动力工程学院,江苏镇江 212013%莱宝(天津)国际贸易有限公司,天津 300000 |
| AuthorAffiliation_xml | – name: 江苏大学能源与动力工程学院,江苏镇江 212013%莱宝(天津)国际贸易有限公司,天津 300000 |
| Author_FL | LI Bin KONG Qian YANG Shiqi WANG Zhentao XUE Jiayi LI Rui |
| Author_FL_xml | – sequence: 1 fullname: WANG Zhentao – sequence: 2 fullname: XUE Jiayi – sequence: 3 fullname: KONG Qian – sequence: 4 fullname: LI Rui – sequence: 5 fullname: YANG Shiqi – sequence: 6 fullname: LI Bin |
| Author_xml | – sequence: 1 fullname: 王贞涛 – sequence: 2 fullname: 薛佳怡 – sequence: 3 fullname: 孔茜 – sequence: 4 fullname: 李睿 – sequence: 5 fullname: 杨诗琪 – sequence: 6 fullname: 李彬 |
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| DocumentTitle_FL | Transition experiment from dripping to jetting mode |
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| Keywords | dripping jetting 韦伯数 liquid Weber number 射流 液体 转变过程 transition 滴状 |
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| Title | 滴状向射流模式转变的试验研究 |
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