Numerical study of an air-jet spinning nozzle with a slotting-tube

Guo, Hui; Chen, Zhiyong; Yu, Chongwen

doi:10.1088/1742-6596/96/1/012110

Cited by 12 publications

(20 citation statements)

References 9 publications

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“…The extensive use of the model has highlighted both its robustness and low computational expense Haque et al [18]. Standard k-ε turbulent models were also widely used for the numerical analyses of the nozzle in which pressurized air is fed Patnaik et al [6]; Guo & Yu [19]; Guo & Yu [9]; Rengasamy et al [8]. Although k-ε turbulent model produces the reasonable results, the model does not perform very well for the flows at the boundary layer separation, sudden changes in swirling and rotating flows and flows over the curved surfaces Guo et al [9][10][11].…”

Section: Solution Algorithm: Turbulence Modelsmentioning

confidence: 99%

“…Standard k-ε turbulent models were also widely used for the numerical analyses of the nozzle in which pressurized air is fed Patnaik et al [6]; Guo & Yu [19]; Guo & Yu [9]; Rengasamy et al [8]. Although k-ε turbulent model produces the reasonable results, the model does not perform very well for the flows at the boundary layer separation, sudden changes in swirling and rotating flows and flows over the curved surfaces Guo et al [9][10][11]. Wilcox [20] suggested another model (k-ω) based on the [20]activated in the near-wall region and the standard k-ε model activated in the outer wake region and in free shear layers Dhinsa et al [17]; Bartosiewicz et al [21]; Haque et al [18].…”

Section: Solution Algorithm: Turbulence Modelsmentioning

confidence: 99%

“…In numerical analyses, Zeng & Yu [4] used PHOENICS while Patnaik et al [5,6]; Rengasamy et al [7,8] realized the simulations by fluent package programs and they all used standard k-ε turbulent model as a solution algorithm. On the other hand, Guo et al [9][10][11] worked on the simulation of the nozzle used in air-jet spinning system. Standard k-ε turbulent model is widely preferred for the turbulent model in the engineering application and hence all these numerical analyses were realized by standard or modified k-ε model.…”

Section: Introductionmentioning

confidence: 99%

“…In Murata vortex spinning, which is considered as a modification of air-jet spinning, the flow field inside the nozzle was also simulated by realized k-ε model Zou et al [12]; Pei & Yu [13,14]. Nevertheless, k-ε model does not perform very well for the flows with boundary layer separation, sudden changes in swirling and rotating flows and flows over the curved surfaces Guo et al [9][10][11]. However, Shear Stress Transport (SST) model accounts for the transport of the turbulent shear stress and gives highly accurate predictions of the onset and the amount of the flow separation under adverse pressure gradients [15].…”

Section: Introductionmentioning

confidence: 99%

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Experimental and Computational Analysis of Nozzle Structural Parameters of Jetring Spinning System

Usal¹,

Yılmaz²

2017

JTEFT

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The main aim of the work is to analyse the airflow character and fluid variables of the air nozzle of Jetring spinning system computationally. In numerical simulation, ANSYS 12.1 package program and Fluid Flow (CFX) analysis method was used. Our numerical analysis differs from the literature regarding to three contributing causes. One of them is the type of the solution algorithm. Standard and also modified k-ε turbulent models were widely used for the numerical analyses of the nozzle in which pressurized air is fed. In our study, Shear Stress Turbulent (SST) model is preferred regarding to the solution duration and also solution stability. The second contributing cause is the boundary condition and solution validation. Mass flow values of the air in the nozzle were measured by electronic mass flow meter and the values were compared with the calculated values obtained by the numerical analysis. The last cause is the yarn component of the Jetring system. Contrary to assumption of the insignificant effect of the yarn on to the airflow in the literature, the yarn was modeled and the area from where the yarn is passing was included to the numerical analysis. Consequently, we determined the calculated and measured values are almost compatible. It was observed different types of airflow in mainly three different parts of the nozzle with different air velocities and pressure values.

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Section: Solution Algorithm: Turbulence Modelsmentioning

confidence: 99%

Section: Solution Algorithm: Turbulence Modelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental and Computational Analysis of Nozzle Structural Parameters of Jetring Spinning System

Usal¹,

Yılmaz²

2017

JTEFT

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“…Little work has been reported regarding the flow field in this geometry. Our earlier reports [28,29] studied the fluid behavior inside this geometry and discussed the function of the slotted-tube and the effect of injector pressure using a numerical method. Spinning test studies have shown that yarn properties are strongly dependent on the groove parameters of the slotted-tube [30].…”

Section: Introductionmentioning

confidence: 99%

3D tangentially injected swirling recirculating flow in a nozzle with a slotted‐tube—Effects of groove parameters

Guo

Chen

2010

Numerical Methods in Fluids

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SUMMARYA numerical prediction for 3D swirling recirculating flow in an air-jet spinning nozzle with a slotted-tube is carried out with the realizable k-ε turbulence model. The effects of the groove parameters on the flow and yarn properties are investigated. The simulation results show that some factors, such as reverse flow upstream of the injector, vortex breakdown downstream of the injector, corner recirculation zone (CRZ) behind the step and vortex ring in the groove caused by the groove geometric variation, are significantly related to fluid flow, and consequently to yarn properties. With increasing groove height, the length of the CRZ increases, while the initial vortex ring in the groove decreases and a same direction rotating vortex forms in the bottom of the groove. Similarly, as the groove width increases, the extent of both vortex breakdown in downstream of the injectors and the vortex ring in the groove increases slightly, whereas the CRZ lengths in stream-wise direction decrease. Some factors, such as the negative tangential velocities, the size of the vortex rings in the grooves and the CRZ, are constant for nozzles with different groove lengths.

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Numerical simulation of tangentially injected turbulent swirling flow in a divergent tube

Guo¹,

Chen²

2008

Numerical Methods in Fluids

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SUMMARYThis paper studies the properties of turbulent swirling decaying flow induced by tangential inlets in a divergent pipe using the realizable k-turbulence model and discusses the effects of the injector pressure and injection position. The results of transient solutions show that both the recirculation zone near the wall in upstream of the injectors and the vortex breakdown in downstream of the injectors increase in size during the whole period. A nearly axisymmetric conical breakdown is formed and its internal structure consists of two asymmetric spiral-like vortices rotating in opposite directions. The stagnation point shifts slowly toward the pipe outlet over time. The maxima of the three velocity components, which are located near the wall, decrease gradually with streamwise direction. It can also be inferred that Mach number approaches 1.0 near the injector outlets. The velocities increase with the increasing injector pressure. However, its increasing trend is not significant. With the increase of the injection position, vortex breakdown moves in downstream direction and the pitch along the streamwise direction increases.

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Numerical study of an air-jet spinning nozzle with a slotting-tube

Cited by 12 publications

References 9 publications

Experimental and Computational Analysis of Nozzle Structural Parameters of Jetring Spinning System

Experimental and Computational Analysis of Nozzle Structural Parameters of Jetring Spinning System

3D tangentially injected swirling recirculating flow in a nozzle with a slotted‐tube—Effects of groove parameters

Numerical simulation of tangentially injected turbulent swirling flow in a divergent tube

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