Growth rate measurement in free jet experiments

Charpentier, Jean‐Baptiste; Renoult, Marie-Charlotte; Crumeyrolle, Olivier; Mutabazi, Innocent

doi:10.1007/s00348-017-2374-2

Cited by 8 publications

(6 citation statements)

References 23 publications

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“…For nitrogen, the critical temperature and critical pressure are 126 K and 3.4 MPa, respectively. We followed Charpentier's method [24] to obtain the growth rate of the liquid spray. It is well-known that the inviscid jet model was firstly proposed by Rayleigh [25] using linear stability theory.…”

Section: Methodsmentioning

confidence: 99%

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Molecular Dynamics Study on the Mechanism of Nanoscale Jet Instability Reaching Supercritical Conditions

Zhang

et al. 2018

Applied Sciences

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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.

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Section: Methodsmentioning

confidence: 99%

“…Having obtained the gas-liquid interface, we can obtain the spatial growth rate with the method of Charpentier [24]. Figure 9 shows the growth rate from molecular dynamics simulation compared with the theoretical results achieved by Fu et al [21].…”

Section: Spatial Growth Ratementioning

confidence: 97%

Molecular Dynamics Study on the Mechanism of Nanoscale Jet Instability Reaching Supercritical Conditions

Zhang

et al. 2018

Applied Sciences

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“…Charpentier’s method was followed to obtain the growth rate of the liquid spray [25]. As is known, Rayleigh proposed the first model of inviscid jet using a linear stability theory [26].…”

Section: Methodsmentioning

confidence: 99%

Molecular Dynamics Simulation of a Jet in a Binary System at Supercritical Environment

Fang

Zhang

et al. 2018

Molecules

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With the development of large-thrust liquid rocket engines, the behavior of liquid in supercritical conditions arouses increasing public interest. Due to the high pressure and temperature of the combustion chamber, fuel reaches its critical point much more easily, and enters supercritical conditions. Due to the drastic changes in the physical properties of the fluid near the critical point, it is usually difficult to simulate the fluid motion using traditional computational fluid dynamic methods; but molecular dynamics (MD) can simulate fluid motion at the molecular level. In view of the engineering application, the physical properties of a binary system consisting of argon and nitrogen, and the stability of subcritical jets sprayed into supercritical environment, has been studied here using the MD method. First, the molecular dynamic simulation of the equation of state (EOS) of the mixture was put forward. Four conditions, with different mixing ratios of nitrogen, were designed. The results showed that the mixing ratio of nitrogen noticeably affected the results; these results were compared with the Soave-Redich-Kwong (SRK) EOS. Second, a simulation was conducted of subcritical nitrogen jet sprayed into a supercritical argon environment. After analyzing the results, the jet density and temperature distributions were obtained and the disturbance growth rate of the shear layer was analyzed.

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“…The dimensionless free jet wave number k is determined using the same protocol as Charpentier et al (2017). The jet contours are extracted from the segmented images corresponding to the linear regime of the instability (previously identified on d max (t) behavior).…”

Section: Other Measurementsmentioning

confidence: 99%

“…The polymer is dissolved into demineralized water with 5% in mass of isopropyl alcohol. The isopropyl alcohol fraction facilitates the dispersion of the PEO powder in the water (Charpentier et al, 2017). Six different concentrations are prepared from 5 to 20 part per million (ppm) in mass of PEO.…”

Section: Other Measurementsmentioning

confidence: 99%

Measurement of extensional properties during free jet breakup

2020

Self Cite

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This paper reports an experimental method for extracting the extensional properties of viscoelastic liquids during atomization. As a first approach, lowvelocity free jets are considered. Such jets of viscoelastic liquids break with the formation of a beads-on-a-string pattern composed of quasi-spherical beads and quasicylindrical ligaments. The liquid extensional properties, i.e., the relaxation time and the terminal extensional viscosity, are measured by analyzing the ligament thinning. This analysis uses a statistical multi-scale description tool whose principle is explained for an ensemble of thinning cylinders. The tool is applied to free jets of dilute polymer solutions for several polymer concentrations, liquid flow rates and nozzle dimensions. Results show a correlation between the terminal extensional viscosity and the relaxation time in good agreement with the literature. The relaxation time is found to depend on an equivalent nozzle deformation rate. This behavior is due to polymer mechanical degradation in the nozzle. Because of its statistical nature, the method also returns the diameter distribution of the ligaments seen at each position along the jet. Ligament diameter distributions observed in more energetic atomization processes can thus be measured. The extensional properties can also be inferred from a temporal monitoring of these ligaments.

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Growth rate measurement in free jet experiments

Cited by 8 publications

References 23 publications

Molecular Dynamics Study on the Mechanism of Nanoscale Jet Instability Reaching Supercritical Conditions

Molecular Dynamics Study on the Mechanism of Nanoscale Jet Instability Reaching Supercritical Conditions

Molecular Dynamics Simulation of a Jet in a Binary System at Supercritical Environment

Measurement of extensional properties during free jet breakup

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