Numerical study on the effect of nozzle pressure and yarn delivery speed on the fiber motion in the nozzle of Murata vortex spinning

Pei, Zeguang; Yu, Chongwen

doi:10.1016/j.jfluidstructs.2010.08.007

Cited by 39 publications

(19 citation statements)

References 25 publications

(16 reference statements)

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“…A stenotic region was included in order to simulate an airway with SGS. The model was created and solved using ADINA (ADINA R&D, Inc., Watertown, MA), a commercial finite element software package which specializes in solving systems that involve fluid-structure interactions and which has been employed in previous studies of biological fluid-structure interactions, including those of the vocal folds and airway (e.g., Bertram, 2009; Pickup and Thomson, 2011; Pei and Yu, 2011; Wang et al, 2012). …”

Section: Methodsmentioning

confidence: 99%

Influence of subglottic stenosis on the flow-induced vibration of a computational vocal fold model

Smith

Thomson

2013

Journal of Fluids and Structures

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The effect of subglottic stenosis on vocal fold vibration is investigated. An idealized stenosis is defined, parameterized, and incorporated into a two-dimensional, fully-coupled finite element model of the vocal folds and laryngeal airway. Flow-induced responses of the vocal fold model to varying severities of stenosis are compared. The model vibration was not appreciably affected by stenosis severities of up to 60% occlusion. Model vibration was altered by stenosis severities of 90% or greater, evidenced by decreased superior model displacement, glottal width amplitude, and flow rate amplitude. Predictions of vibration frequency and maximum flow declination rate were also altered by high stenosis severities. The observed changes became more pronounced with increasing stenosis severity and inlet pressure, and the trends correlated well with flow resistance calculations. Flow visualization was used to characterize subglottal flow patterns in the space between the stenosis and the vocal folds. Underlying mechanisms for the observed changes, possible implications for human voice production, and suggestions for future work are discussed.

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Section: Methodsmentioning

confidence: 99%

Influence of subglottic stenosis on the flow-induced vibration of a computational vocal fold model

Smith

Thomson

2013

Journal of Fluids and Structures

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“…Then, its trailing end splays out and whirls within the nozzle chamber for several turns to helically wrap and make the spun yarn. It was also reported that the effect of nozzle pressure on MVS yarn tenacity is not obvious, while increased yarn delivery speed leads to a decrease in yarn tenacity [9].…”

Section: Introductionmentioning

confidence: 99%

An Investigation of the Effect of Delivery Speed and Nozzle Air Pressure on Viscose

Yali¹,

Akdoğanözü²,

Kalayci³

et al. 2020

Tekstil ve Mühendis

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In this study, 100% viscose yarns were spun at different delivery speed and nozzle air pressure values (within a range of 300-450 m/min and 0.46-0.58 MPa, respectively) by using Murata Vortex spinning system (MVS). Then, the effect of these parameters on physical properties of yarns (such as irregularity, hairiness, tensile strength, breaking elongation, yarn density and diameter) was analysed comparing with the results given in literature for various fiber types. The results show that yarn delivery speed and nozzle air pressure have no effect on yarn irregularity, while they affect hairiness, breaking elongation, diameter and density of yarns. On the other hand, an increase in nozzle air pressure has a slight effect on yarn tenacity while yarn delivery speed seems to have no effect in this work.

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“…Pei and Yu [14] studied the motional characteristics of the exible bers in the air ow inside the Murata vortex spinning (MVS) nozzle. A two-dimensional uid structure interaction (FSI) model combined with the ber wall contact is introduced to simulate a single ber moving in the air ow inside the MVS nozzle.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Motion of Long Flexible Fibers with Different Linear Densities in Jet Flow

Lin

Jin

et al. 2018

Journal of Nanotechnology

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Air-jet loom is a textile machine designed to drive the long fiber using a combination flow of high-pressure air from a main nozzle and a series of assistant nozzles. To make the suggestion of how to make the fiber fly with high efficiency and stability in the jet flow, in which vortices also have great influence on fiber movement, the large eddy simulation method was employed to obtain the transient flow field of turbulent jet, and a bead-rod chain fiber model was used to predict long flexible fiber motion. The fluctuation and velocity of fibers with different linear densities in jet flow were studied numerically. The results show that the fluctuation amplitude of a fiber with a linear density of 0.5 × 10−5 kg·m−1 is two times larger than that of a fiber with a linear density of 2.0 × 10−5 kg·m−1. The distance of the first assistant nozzle from the main nozzle should be less than 120 mm to avoid collision between the fiber and the loom. The efficient length of the main nozzle to carry the fiber flying steadily forward is about 100–110 mm. For fibers with a linear density of 0.5 × 10−5 kg·m−1, it is suggested that the distance of the first assistant nozzle from the main nozzle is about 110 mm. With the increase of fiber linear density, the distance could be appropriately increased to 140 mm. The simulation results provide an optimization option for the air-jet loom to improve the energy efficiency by reasonably arranging the first assistant nozzle.

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Numerical study on the effect of nozzle pressure and yarn delivery speed on the fiber motion in the nozzle of Murata vortex spinning

Cited by 39 publications

References 25 publications

Influence of subglottic stenosis on the flow-induced vibration of a computational vocal fold model

Influence of subglottic stenosis on the flow-induced vibration of a computational vocal fold model

An Investigation of the Effect of Delivery Speed and Nozzle Air Pressure on Viscose

Simulation of Motion of Long Flexible Fibers with Different Linear Densities in Jet Flow

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