A study on flow through hydroentangling nozzles and their degradation

Anantharamaiah, Nagendra; Tafreshi, H. Vahedi; Pourdeyhimi, Behnam

doi:10.1016/j.ces.2006.01.038

Cited by 25 publications

(12 citation statements)

References 15 publications

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“…5), this results in a discharge coefficient of 0.80 for the double conical geometry and of 0.62 for the rest of the geometries. These values are in agreement with the experimental results (Anantharamaiah et al, 2006b), which observes a discharge coefficient of 0.9 for cone-up nozzle, and a discharge coefficient of 0.62 for a sharp edge inlet.…”

Section: Discharge Coefficientsupporting

confidence: 82%

“…E.g., the disturbances and the effect of droplets on the quality of the jet during the jet formation was studied (Arleo et al, 2010). The influence of the internal geometry of the orifice on the flow regime and on the discharge coefficient were analysed (Anantharamaiah et al, 2006a and2006b), concluding that the ratio between the length and the diameter of the capillary (L 0 /d 0 ) has a strong influence on the flow regime. Also, a study was made concluding that the internal geometry of the orifice housing affects to the velocity and the coherence of the jet and thus, to the cutting quality.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical Simulation of Water Jet Quality for Different Orifice Geometries

Goikoetxea¹,

Alberdi²,

Suarez³

et al. 2011

DAAAM International Scientific Book 2011

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Section: Discharge Coefficientsupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Water Jet Quality for Different Orifice Geometries

Goikoetxea¹,

Alberdi²,

Suarez³

et al. 2011

DAAAM International Scientific Book 2011

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“…Schweitzer (1937) stated that a jet in a stable hydraulic flip condition is characterized by a constricted structure, which looks glassy and transparent like a laminar flow in spite of its very high Re values. Furthermore, another important feature of the "flipped" jet is the breakup length, which is significantly longer if compared to a non-constricted jet in the same working conditions, as shown by Anantharamaiah et al (2006). These analysis were integrated by Arleo (2010) with an analytical study of the water jet outflow process, which confirmed that sharp-edged orifices supplied by the typical pressure values used in WJ cutting applications work in a stable condition of hydraulic flip.…”

Section: Introductionsupporting

confidence: 48%

CFD aided design and experimental validation of an innovative Air Assisted Pure Water Jet cutting system

Annoni

Arleo

Malmassari

2014

Journal of Materials Processing Technology

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Water jet cutting has always been a promising technology because of its extreme simplicity and flexibility, even if it often suffers a lack of control on its process parameters, especially if compared to technologies such as laser cutting or electro-discharge machining. Recent studies have showed how the presence of water inside the orifice causes disturbances and instabilities which systematically a↵ect the jet structure, both during the jet formation and the cutting process. These disturbances can be neglected in industrial applications, but they can play a relevant role in case of high-precision water jet machining. The aim of the research presented in this paper is to develop an innovative system able to modify the orifice flow field by means of a simple modification of the standard cutting head geometry; the system allows the controlled injection of air inside the primary orifice to prevent the jet instabilities and to adapt the level of jet coherence to the specific machining operation. The fluid dynamics aspects of the outflow process are investigated by means of a 3D numerical simulation with the Ansys Fluent CFD solver, while considerable experimental e↵orts are provided in order to validate the numerical model and finally evaluate the system performances on real case studies.

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“…In the initial stage, water density and kinetic energy are kept constantly, therefore, only this stage can be used for effective cutting, as after this stage, the kinetic energy disperse and the jet no longer has any utility for hydroentangling (Anantharamaiah et al, 2006), and the second stage is used for cleaning and the third stage is for dust control (Xue et al, 1998). Fig.…”

Section: Fundamentals Of the Waterjet Slotting Techniquementioning

confidence: 99%

“…The efficiency with which the web is entangled depends on the peculiar properties of laminar high-speed waterjets used. In order to improve the understanding of the flow field inside the nozzle and its potential influence on the nozzle wear, a series of simulations has been performed using Fluent code (Anantharamaiah et al, 2006). The program is also often used to determine the nozzle geometries in fuel thermal spray system (Baika and Kim, 2008).…”

Section: Effect Of Other Geometrical Parameters Of Nozzle On Cutting mentioning

confidence: 99%