Molecular Dynamics Study on the Mechanism of Nanoscale Jet Instability Reaching Supercritical Conditions
This paper investigates the characteristics of a nitrogen jet (the thermodynamic conditions ranging from subcritical to supercritical) ejected into a supercritical nitrogen environment using the molecular dynamics (MD) simulation method. The thermodynamic properties of nitrogen obtained by molecular...
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MDPI AG
2018-09-01
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| Series: | Applied Sciences |
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| Online Access: | http://www.mdpi.com/2076-3417/8/10/1714 |
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| author | Qingfei Fu Yunxiao Zhang Chaojie Mo Lijun Yang |
| author_facet | Qingfei Fu Yunxiao Zhang Chaojie Mo Lijun Yang |
| author_sort | Qingfei Fu |
| collection | DOAJ |
| description | This paper investigates the characteristics of a nitrogen jet (the thermodynamic conditions ranging from subcritical to supercritical) ejected into a supercritical nitrogen environment using the molecular dynamics (MD) simulation method. The thermodynamic properties of nitrogen obtained by molecular dynamics show good agreement with the Soave-Redlich-Kwong (SRK) equation of state (EOS). The agreement provides validation for this nitrogen molecular model. The molecular dynamics simulation of homogeneous nitrogen spray is carried out in different thermodynamic conditions from subcritical to supercritical, and a spatio-temporal evolution of the nitrogen spray is obtained. The interface of the nitrogen spray is determined at the point where the concentration of ejected fluid component reaches 50%, since the supercritical jet has no obvious vapor-liquid interface. A stability analysis of the transcritical jets shows that the disturbance growth rate of the shear layer coincides very well with the classical theoretical result at subcritical region. In the supercritical region, however, the growth rate obtained by molecular dynamics deviates from the theoretical result. |
| first_indexed | 2024-12-22T06:17:37Z |
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| id | doaj.art-9aa0cca5e98d49f98355013f46f85e40 |
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| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-12-22T06:17:37Z |
| publishDate | 2018-09-01 |
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| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-9aa0cca5e98d49f98355013f46f85e402022-12-21T18:36:02ZengMDPI AGApplied Sciences2076-34172018-09-01810171410.3390/app8101714app8101714Molecular Dynamics Study on the Mechanism of Nanoscale Jet Instability Reaching Supercritical ConditionsQingfei Fu0Yunxiao Zhang1Chaojie Mo2Lijun Yang3School of Astronautics, Beihang University, Beijing 100191, ChinaSchool of Astronautics, Beihang University, Beijing 100191, ChinaSchool of Astronautics, Beihang University, Beijing 100191, ChinaSchool of Astronautics, Beihang University, Beijing 100191, ChinaThis paper investigates the characteristics of a nitrogen jet (the thermodynamic conditions ranging from subcritical to supercritical) ejected into a supercritical nitrogen environment using the molecular dynamics (MD) simulation method. The thermodynamic properties of nitrogen obtained by molecular dynamics show good agreement with the Soave-Redlich-Kwong (SRK) equation of state (EOS). The agreement provides validation for this nitrogen molecular model. The molecular dynamics simulation of homogeneous nitrogen spray is carried out in different thermodynamic conditions from subcritical to supercritical, and a spatio-temporal evolution of the nitrogen spray is obtained. The interface of the nitrogen spray is determined at the point where the concentration of ejected fluid component reaches 50%, since the supercritical jet has no obvious vapor-liquid interface. A stability analysis of the transcritical jets shows that the disturbance growth rate of the shear layer coincides very well with the classical theoretical result at subcritical region. In the supercritical region, however, the growth rate obtained by molecular dynamics deviates from the theoretical result.http://www.mdpi.com/2076-3417/8/10/1714supercriticalmolecular dynamicsflow instabilitiesliquid jet |
| spellingShingle | Qingfei Fu Yunxiao Zhang Chaojie Mo Lijun Yang Molecular Dynamics Study on the Mechanism of Nanoscale Jet Instability Reaching Supercritical Conditions Applied Sciences supercritical molecular dynamics flow instabilities liquid jet |
| title | Molecular Dynamics Study on the Mechanism of Nanoscale Jet Instability Reaching Supercritical Conditions |
| title_full | Molecular Dynamics Study on the Mechanism of Nanoscale Jet Instability Reaching Supercritical Conditions |
| title_fullStr | Molecular Dynamics Study on the Mechanism of Nanoscale Jet Instability Reaching Supercritical Conditions |
| title_full_unstemmed | Molecular Dynamics Study on the Mechanism of Nanoscale Jet Instability Reaching Supercritical Conditions |
| title_short | Molecular Dynamics Study on the Mechanism of Nanoscale Jet Instability Reaching Supercritical Conditions |
| title_sort | molecular dynamics study on the mechanism of nanoscale jet instability reaching supercritical conditions |
| topic | supercritical molecular dynamics flow instabilities liquid jet |
| url | http://www.mdpi.com/2076-3417/8/10/1714 |
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