Performance Characteristics of Effervescent Atomizer in Different Flow Regimes

Ramamurthi, K.; Sarkar, U. K.; Raghunandan, B. N.

doi:10.1615/atomizspr.v19.i1.30

Cited by 38 publications

(16 citation statements)

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“…The atomizing gas consequently undergoes sudden pressure relaxation and rapid expansion at the atomizer exit, thereby shattering the liquid into ligaments and drops (Ramamurthi et al, 2009). The gas-liquid two-phase interaction reportedly has an important function in aiding liquid atomization.…”

Section: Introductionmentioning

confidence: 99%

Time–frequency analysis of acoustic and unsteadiness evaluation in effervescent sprays

Sun

Ning²,

Lv³

et al. 2015

Chemical Engineering Science

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Section: Introductionmentioning

confidence: 99%

Time–frequency analysis of acoustic and unsteadiness evaluation in effervescent sprays

Sun

Ning²,

Lv³

et al. 2015

Chemical Engineering Science

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“…G features a significant change at ∆pmix ≥ 0.1 MPa in comparison with its change at lower ∆pmix. According to the known relation CD  G/(∆pmix) 0.5 [39], at ∆pmix < 0.1 MPa, the effect of the pressure increase is predominant and overcomes the effect of the G increase, so CD decreases; it is vice versa for ∆pmix > 0.1 MPa (see Figures 5b and 6). Additionally, as aforementioned, Figure 5b shows that the increase in GLR suppresses the effect of ∆pmix/pamb on CD because of a decrease in the liquid amount.…”

Section: The Effect Of the Inlet-overpressure Ratio On C Dmentioning

confidence: 95%

The Effect of Geometrical, Operational, Mixing Methods, and Rheological Parameters on Discharge Coefficients of Internal-Mixing Twin-Fluid Atomizers

et al. 2020

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Accurate prediction of the discharge coefficient (CD) for internal-mixing twin-fluid (IMTF) atomizers is challenging, the effect of control factors remains inadequately understood, and comparative data on the CD of IMTF atomizers are unavailable. This work presents an experimental study on CD for different IMTF atomizers with a wide range of factors, including the gas-to-liquid ratio (GLR), the inlet-overpressure ratio (∆pmix/pamb), the orifice length-to-diameter ratio (Lo/do), and the liquid viscosity (µL). Five atomizers with different internal-mixing principles were probed on a cold test rig, including the frequently studied outside-in-gas (OIG) and inside-out-gas (IOG) effervescent types, the recently-introduced outside-in-liquid (OIL) and air-core-liquid-ring (ACLR) atomizers, and our new design named the swirling-air-core-liquid-ring (SACLR) atomizer. The results demonstrate that CD is governed mainly by GLR, and reduces if GLR, Lo/do, or µL is increased. An increase in ∆pmix/pamb causes a CD reduction up to ∆pmix/pamb = 0.98, and CD increases for a higher ∆pmix/pamb. Surprisingly, differences in CD amid examined atomizers were found negligible, although the flow visualization inside the orifice showed a significantly different flow character for each one of the atomizers. Finally, a general CD correlation fitting with an R2 ≥0.99 for all the tested nozzles was proposed. The results amend the present knowledge, allow design optimization, and provide flow rate prediction for a variety of IMTF atomizers.

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“…The results indicated that the aerated-liquid spray is strongly related to the internal two-phase flow. Ramamurthi et al 6 carried out experiments to investigate the spray under various flow regimes. Characteristics of the two-phase internal flow and spray performance over a wide range of gas-liquid mass ratios (GLRs), pressures and discharge orifice diameters were presented.…”

Section: Introductionmentioning

confidence: 99%

“…The results showed that the bubble in the nozzle exit region would be stretched by the pressure drop and deformed into smaller bubbles. Ramamurthi et al 6 carried out a two-dimensional simulation to study the features of internal flow and spray. The results showed that the initial spherical bubble would be elongated in the nozzle exit region.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical simulation of gas–liquid flow behavior in the nozzle exit region of an effervescent atomizer

Sun

Ning

Qiao

et al. 2019

International Journal of Spray and Combustion Dynamics

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The pressure drop and particular geometric structure of the nozzle exit region of an effervescent atomizer cause complex changes in the flow pattern, which could affect the spray performance. In this study, the gas-liquid twophase flow behavior in the nozzle exit region of the effervescent atomizer was investigated numerically. The results show that the flow behaviors in the nozzle exit region have disparate characteristics with different upstream flow regimes. For upstream churn flow, the liquid film morphology is closely related to fluctuation in the gas-liquid velocity, and the flow parameters (fluids' velocities and gas void fraction) at the exit section vary regularly with time. For upstream bubbly flow, the instantaneous gas void fraction is determined by the bubble distribution inside the mixing chamber. The bubble will form a tadpole-like shape as a result of the complex flow field and the surface tension. The flow parameters at the exit section are in an oscillatory decay, and the fluctuation amplitude is larger than for churn flow. For upstream slug flow, the gas void fraction varies significantly with time. The discrete characteristic of the gas-liquid flow parameters at exit section is very obvious.

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Performance Characteristics of Effervescent Atomizer in Different Flow Regimes

Cited by 38 publications

References 0 publications

Time–frequency analysis of acoustic and unsteadiness evaluation in effervescent sprays

Time–frequency analysis of acoustic and unsteadiness evaluation in effervescent sprays

The Effect of Geometrical, Operational, Mixing Methods, and Rheological Parameters on Discharge Coefficients of Internal-Mixing Twin-Fluid Atomizers

Numerical simulation of gas–liquid flow behavior in the nozzle exit region of an effervescent atomizer

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