A transient thickness distribution measured with a high temporal resolution is elemental for exploring the flow characteristics and mechanism of a liquid film formed by an impinging jet.Therefore,this paper develops a...A transient thickness distribution measured with a high temporal resolution is elemental for exploring the flow characteristics and mechanism of a liquid film formed by an impinging jet.Therefore,this paper develops a high-speed Light-Emitting Diode-Induced Fluorescence(LEDIF)system based on the brightness measured directly above the liquid film.An Ultraviolet(UV)LED lamp is used to provide sufficient and continuous excitation light.Then,a system performance analysis proves that the system can continuously measure the global film thickness at a high acquisition frequency of 5000 Hz when the dye concentration is 200 mg/L.The influence of the irregularity of the excitation intensity,including the spatial non-uniformity,temporal instability,and long-term instability,on the measurement uncertainty is analyzed in detail.The analysis indicates that the system has an acceptable uncertainty of 10%.Compared with theoretical results,experimental results verify that the LEDIF system can accurately measure the global thickness of a liquid film formed by a water jet obliquely impinging onto a plate.An experimental investigation of the radial section of the raised zone demonstrates that the radial section changes from a sewing needle to an oval when the azimuth angle increases from 10°to 90°.Meanwhile,the dynamic contact angle exponentially decreases from 41.4°to 30.1°.A dynamic analysis of surface waves shows that the measured wave velocity decreases from 12 m/s to 1 m/s and the dominant frequency decreases from 1000 Hz to 10 Hz along the flow direction.展开更多
1 Introduction and main contributions Multi-view based HIN embedding method embeds the multiple views of heterogeneous information networks(HIN)to the low-dimensional space.It can preserve rich structural and semantic...1 Introduction and main contributions Multi-view based HIN embedding method embeds the multiple views of heterogeneous information networks(HIN)to the low-dimensional space.It can preserve rich structural and semantic information by using HIN data of multiple views[1,2].In real networks,relations are partially observed due to privacy issues or other reasons,resulting in the incompleteness of single view[3,4].Existing methods usually ignore this problem,which lead to data sparse and it is difficult to extract the hidden semantic relationship of HIN.展开更多
基金supported by the Provincial or Ministerial Level Project,China。
文摘A transient thickness distribution measured with a high temporal resolution is elemental for exploring the flow characteristics and mechanism of a liquid film formed by an impinging jet.Therefore,this paper develops a high-speed Light-Emitting Diode-Induced Fluorescence(LEDIF)system based on the brightness measured directly above the liquid film.An Ultraviolet(UV)LED lamp is used to provide sufficient and continuous excitation light.Then,a system performance analysis proves that the system can continuously measure the global film thickness at a high acquisition frequency of 5000 Hz when the dye concentration is 200 mg/L.The influence of the irregularity of the excitation intensity,including the spatial non-uniformity,temporal instability,and long-term instability,on the measurement uncertainty is analyzed in detail.The analysis indicates that the system has an acceptable uncertainty of 10%.Compared with theoretical results,experimental results verify that the LEDIF system can accurately measure the global thickness of a liquid film formed by a water jet obliquely impinging onto a plate.An experimental investigation of the radial section of the raised zone demonstrates that the radial section changes from a sewing needle to an oval when the azimuth angle increases from 10°to 90°.Meanwhile,the dynamic contact angle exponentially decreases from 41.4°to 30.1°.A dynamic analysis of surface waves shows that the measured wave velocity decreases from 12 m/s to 1 m/s and the dominant frequency decreases from 1000 Hz to 10 Hz along the flow direction.
基金This research was supported by the Fundamental Research Funds for the Central Universities of China(NS2019056).
文摘1 Introduction and main contributions Multi-view based HIN embedding method embeds the multiple views of heterogeneous information networks(HIN)to the low-dimensional space.It can preserve rich structural and semantic information by using HIN data of multiple views[1,2].In real networks,relations are partially observed due to privacy issues or other reasons,resulting in the incompleteness of single view[3,4].Existing methods usually ignore this problem,which lead to data sparse and it is difficult to extract the hidden semantic relationship of HIN.
