Air‐flow field of the melt‐blowing slot die via numerical simulation and multiobjective genetic algorithms

Sun, Yize; Liu, B. W.; Wang, X. H.; Zeng, Yongchun

doi:10.1002/app.34760

Cited by 24 publications

(34 citation statements)

References 13 publications

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“…It is shown that mean velocity decreases rapidly with increasing distance from the die until reaching the point of z = 50 mm. A maximum mean velocity of 183 m s -1 is obtained at the point of z = 6 mm, which is about 30 m s -1 higher than the maximum velocity measured by previous researchers [13][14][15][16]. Although air velocity in the region of 0 mm \ z \ 6 mm is not shown in this work, it is no doubt that fiber undergoes strong attenuation effect by the high-speed air velocity in this region.…”

Section: Fluctuation Of Temperaturecontrasting

confidence: 69%

“…Compared to the previous works [13][14][15][16]28], innovations of researching turbulent air flow field in this work were: (1) an advanced two-dimensional velocity probe instead of one-dimensional velocity probe was applied in hotwire anemometer for measuring the fluctuation of air velocity, (2) the fluctuation of air temperature was originally measured, which has not been reported until now, (3) the coupling effect between air velocity and temperature was also analyzed by processing the data of measurements. Figure 1 a Schematic of the process of slot-die melt blowing [21], b the structure of single-orifice slot die and, c the real single-orifice slot die used in this work.…”

Section: Introductionmentioning

confidence: 88%

“…b Schematic of devices for measuring the air flow field in slotdie melt blowing. The anemometer probe was set below the die, c the structure of one-dimensional velocity probe used by previous researchers [14][15][16]28], d the structure of two-dimensional probe used in the present work. It noted that the measurement of air flow field was taken in the absence of fiber.…”

Section: Melt-blowing Setups and Conditionsmentioning

confidence: 99%

“…Compared to one-dimensional velocity probe used in previous researchers [14][15][16]28], a two-dimensional velocity probe was attempted for the velocity measurement in this work; Figs. 2c and 2d illustrate the structures of one-dimensional and two-dimensional velocity probe.…”

Section: Measurementsmentioning

confidence: 99%

“…However, for the limitation of Pitot tube, air velocities they measured were far below the industrial level, about velocity of sound [12]. Later, more advanced equipments with higher accuracy, such as hot-wire anemometer and laser Doppler velocimeter were applied to measuring the air flow fields [13][14][15][16], the maximum velocity they measured increased to be about 150 m s -1 . It noted that the air flow fields all they have measured were described by average values, namely, the turbulent characteristic of air flow field was not provided.…”

Section: Introductionmentioning

confidence: 99%

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Turbulent air flow field in slot-die melt blowing for manufacturing microfibrous nonwoven materials

et al. 2018

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Melt blowing is an industrial approach for producing microfibrous nonwoven materials utilizing high-speed air to attenuate polymer melt. The melt-blowing air flow field which is widely believed to be turbulence determines the process of fiber formation. In this study, the turbulent air flow field in slot-die melt blowing was experimental measured by hot-wire anemometer. The fluctuations of air velocity and temperature, the mean velocity and mean temperature were measured and analyzed; moreover, the relationship between turbulent air flow field and fiber formation in melt blowing was discussed and predicted. In the last part of this paper, the coupling effect of air temperature and velocity was studied tentatively, results showed that air temperature not only had an enhanced effect on velocity, but contributed to the fluctuation of velocity. This work shows that the fluctuating characteristics of air velocity and temperature have dominant effect on fiber motion and the evenness of fiber diameter.

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Section: Fluctuation Of Temperaturecontrasting

confidence: 69%

Section: Introductionmentioning

confidence: 88%

Section: Melt-blowing Setups and Conditionsmentioning

confidence: 99%

Section: Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Turbulent air flow field in slot-die melt blowing for manufacturing microfibrous nonwoven materials

et al. 2018

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Probability of jet roping in solution blowing of multiple jets

Balakrishnan

Pourdeyhimi

Yarin

2023

J of Applied Polymer Sci

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This study describes the development and implementation of a lab‐scale four‐needle nosepiece for solution blowing, which enabled the investigation of the roping probability of four polymer jets at different inter‐needle distances and air velocities. The roping probabilities of the four jets were compared to the corresponding roping probabilities of two jets previously established by the present group. The comparison revealed that at the relatively low air velocities (pressures), the four‐jet configuration reduces roping relative to the two‐jet case, which stems from the reduction of the end effect. However, at relatively high air velocities (pressures), turbulent pulsations in the surrounding air become more dominant than the end effect. Accordingly, the four‐jet case reveals a higher probability of roping at higher air velocities (pressures). The findings shed light on the behavior of multiple solution‐blown jets and the impact of the end effect on roping. The severity of roping in the case of four jets at diminishing inter‐needle distances and increasing air velocity was analyzed using recordings of polymer jets in flight by a high‐speed camera and scanning electron microscopy of the corresponding laydown structure.

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Study on airflow field and fiber motion with new melt blowing die

Wan-jin

Xie

Shi

et al. 2019

Polymer Engineering & Sci

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In this study, a new melt-blowing die was studied with the computational fluid dynamic approach. A bead-viscoelastic element fiber model was established to model threedimensional paths of the fiber motion with the standard linear solid (SLS) constitutive equation in different airflow fields. The effects of this newly designed die on the velocity field, temperature field, and turbulence fluctuation field at the centerline were studied and compared with the traditional melt blowing die. The fiber motion was simulated and compared with the airflow field of different dies. The simulations results demonstrated that the new die was able to reduce the velocity fluctuations of the air flow near the outlet of the polymer capillary and generate the higher centerline air velocity and temperature. The fiber attenuation and motion were related to the centerline air velocity, temperature, and turbulent fluctuation in the melt blowing process.

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Air‐flow field of the melt‐blowing slot die via numerical simulation and multiobjective genetic algorithms

Cited by 24 publications

References 13 publications

Turbulent air flow field in slot-die melt blowing for manufacturing microfibrous nonwoven materials

Turbulent air flow field in slot-die melt blowing for manufacturing microfibrous nonwoven materials

Probability of jet roping in solution blowing of multiple jets

Study on airflow field and fiber motion with new melt blowing die

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