Cavitation in a Two-Dimensional Nozzle and Liquid Jet Atomization (1st Report, Ultra-High Speed Visualization)

明良, 宋; 明男, 冨山; 茂雄, 細川; 慎司, 濁川; 洋一郎, 松本

doi:10.1299/kikaib.72.513

Cited by 4 publications

(7 citation statements)

References 5 publications

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“…Atomization of a liquid jet near the exit was enhanced only in the super cavitation regime. These results qualitatively agreed with those in the case with no seeding particles (6) . The dimensionless cavitation length L cav * , which is defined as the ratio of the mean streamwise length of cavitation zone L cav to the nozzle length L N , is shown in implies the particles slightly enhance cavitation.…”

Section: Experimental Setup and Conditionssupporting

confidence: 90%

“…In the previous paper (6) , we reported that cavitation bubbles appear near the nozzle inlet (about 0.5 mm downstream of the inlet) at the location apart from the side wall, and move along the outer edge of SBL in the case of incipient cavitation (6) . Measures U and u near the inlet (y = 0.5 mm) are shown in Fig.…”

Section: Inception Of Cavitationmentioning

confidence: 87%

“…The details of the experimental setup are described in Ref. (6). Liquid velocity in the nozzle was measured using an LDV system, which consisted of an Ar-ion laser, an LDV optics (DANTEC, 60 × 83) and a signal processor (DANTEC, 58 N10).…”

Section: Experimental Setup and Conditionsmentioning

confidence: 99%

“…Several studies (4) - (6) have been carried out using two-dimensional (2D) nozzles to visualize cavitation in nozzles. Since the deformation of liquid element (atomization) is not directly caused by cavitation bubbles but by the change of liquid velocity in space and time, the knowledge on liquid velocity distribution in nozzles is of use to understand the mechanism of atomization enhancement.…”

Section: Introductionmentioning

confidence: 99%

“…Oda and Yasuda (10) carried out Particle Tracking Velocimetry (PTV) measurement in a 2D nozzle when cavitation occurred near the nozzle inlet. However the distributions of liquid velocity and its fluctuation in a nozzle at various regimes (6) such as incipient cavitation, developing cavitation (in which cavitation appears only near the nozzle inlet) and super cavitation (in which cavitation develops from the nozzle inlet to the exit and liquid jet atomization is enhanced) have not been measured yet. In the present study, liquid velocity in a 2D nozzle was, therefore, measured using LDV in these various cavitation regimes.…”

Section: Introductionmentioning

confidence: 99%

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Cavitation in a Two-Dimensional Nozzle and Liquid Jet Atomization (LDV Measurement of Liquid Velocity in a Nozzle)

Sou

Tomiyama

Hosokawa

et al. 2006

JSME Int. J., Ser. B

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Cavitation in nozzles of liquid injectors is known to affect the atomization of a discharged liquid jet. To understand how cavitating flow in a nozzle enhances the liquid jet atomization, liquid velocity distribution of cavitating flow in a two-dimensional transparent nozzle was measured using a Laser Doppler Velocimetry (LDV) system. As a result, the following conclusions were obtained: (1) The inception of cavitation occurs near the outer edge of separated boundary layer (SBL), where the time-averaged local velocity takes the highest value and the time-averaged pressure is almost equal to the vapor saturation pressure. (2) When the cavitation number σ is greater than 0.78 (in no cavitation and developing cavitation regimes), the reattachment of SBL occurs in the middle of the nozzle. A large velocity fluctuation, which appears just downstream of SBL, decreases near the nozzle exit. Hence the wavy jet is formed in these regimes. (3) For σ ≤ 0.65 (in super cavitation regime), the lateral flow directing from the core region toward the side walls just upstream of the nozzle exit is a major cause of the increase in the spray angle and drastic enhancement of liquid jet atomization. The strong turbulence just upstream of the exit must play an important role in the formation of ligaments on liquid jet interface.

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Section: Experimental Setup and Conditionssupporting

confidence: 90%

Section: Inception Of Cavitationmentioning

confidence: 87%

Section: Experimental Setup and Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Cavitation in a Two-Dimensional Nozzle and Liquid Jet Atomization (LDV Measurement of Liquid Velocity in a Nozzle)

Sou

Tomiyama

Hosokawa

et al. 2006

JSME Int. J., Ser. B

Self Cite

View full text Add to dashboard Cite

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Application of Interface-Tracking Method Based on Phase-Field Model to Numerical Analysis of Isothermal and Thermal Two-Phase Flows

Tsuji

2007

Volume 2: Fora, Parts a and B

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For interface-tracking simulation of two-phase flows in various micro-fluidics devices, the applicability of two versions of Navier-Stokes phase-field method (NS-PFM) was examined, combining NS equations for a continuous fluid with a diffuse-interface model based on the van der Waals-Cahn-Hilliard free-energy theory. Through the numerical simulations, the following major findings were obtained: (1) The first version of NS-PFM gives good predictions of interfacial shapes and motions in an incompressible, isothermal two-phase fluid with high density ratio on solid surface with heterogeneous wettability. (2) The second version successfully captures liquid-vapor motions with heat and mass transfer across interfaces in phase change of a non-ideal fluid around the critical point.

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Numerical Simulation of Isothermal and Thermal Two-Phase Flows Using Phase-Field Modeling

Tsuji

Tomiyama

2007

Int. J. Mod. Phys. C

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For interface-tracking simulation of two-phase flows in various micro-fluidics devices, we examined the applicability of two versions of computational fluid dynamics method, NS-PFM, combining Navier-Stokes equations with phase-field modeling for interface based on the van der Waals-Cahn-Hilliard free-energy theory. Through the numerical simulations, the following major findings were obtained: (1) The first version of NS-PFM gives good predictions of interfacial shapes and motions in an incompressible, isothermal two-phase fluid with high density ratio on solid surface with heterogeneous wettability. (2) The second version successfully captures liquid-vapor motions with heat and mass transfer across interfaces in phase change of a non-ideal fluid around the critical point.

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Cavitation in a Two-Dimensional Nozzle and Liquid Jet Atomization (1st Report, Ultra-High Speed Visualization)

Cited by 4 publications

References 5 publications

Cavitation in a Two-Dimensional Nozzle and Liquid Jet Atomization (LDV Measurement of Liquid Velocity in a Nozzle)

Cavitation in a Two-Dimensional Nozzle and Liquid Jet Atomization (LDV Measurement of Liquid Velocity in a Nozzle)

Application of Interface-Tracking Method Based on Phase-Field Model to Numerical Analysis of Isothermal and Thermal Two-Phase Flows

Numerical Simulation of Isothermal and Thermal Two-Phase Flows Using Phase-Field Modeling

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