Journal articles: 'Centrifugal nozzle'

1

Yan, Su Qian, and Xiao Fen Zhang. "The Numerical Simulation of Flow Field of Target Type Impinging Stream Nozzle Based on Fluent." Advanced Materials Research 490-495 (March 2012): 1501–5. http://dx.doi.org/10.4028/www.scientific.net/amr.490-495.1501.

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In this paper, the numerical simulation of internal and external flow field of target type impinging stream nozzle by using Fluent software is observed, the effect on nozzle atomization was obtained by simulating the size of nozzle structure（the diameter d of nozzle and distance δ between the target and plate）and pressure P (that is to say the flow velocity). The results show that: the larger the structure size and the pressure of nozzle，the better the effect of nozzle atomization.That it has superiority than the general centrifugal nozzles and can save water quantity.

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Valipouri, Afsaneh, Seyed Abdolkarim Hosseini, and Ahmadreza Pishevar. "Ultrafine Solid State Polymerized PA66 Nanofibers Fabrication via Air-Sealed Centrifuge Electrospinning (ASCES)." Advanced Materials Research 856 (December 2013): 290–93. http://dx.doi.org/10.4028/www.scientific.net/amr.856.290.

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This study presents a method for the fabrication of ultrafine polymeric nanofibers utilizing centrifugal and electrostatic forces simultaneously. To reduce the diameter and variability of nanofibers produced from solid state polymerized PA66 (SSP PA66), a unique electro-centrifuge spinning device was designed using rotating nozzle and collector, whereas the fabrication process (spinning head) was skillfully sealed from ambient airflow. An electric field is applied between the nozzle containing the polymer solution and cylindrical collector. Due to centrifugal force, polymer solution is ejected from the nozzle tip and extended by centrifugal force as well as electrical force. The diameters of nanofibers were controlled by adjusting the selected affecting parameters such as solution concentration, rotational speed of spinning head, syringe content as well as applied voltage. With this new technique, nanofibers were electrospun from SSP PA66 solutions. Field emission scanning electron microscope (FESEM) results demonstrated that ASCES has the unique ability to produce high quality ultrafine nanofibers from SSP PA66 polymer. Well control of parameters was tended to produce the thinnest fibers with mean diameter of 63 nm.

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Kropotova, Nadezhda, Alexander Arakcheev, Leonid Tanklevskiy, and Anton Tanklevskiy. "Low pressure water-mist nozzle with a swirl worm screw inserts." MATEC Web of Conferences 245 (2018): 11001. http://dx.doi.org/10.1051/matecconf/201824511001.

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The article contains the main results of the creation of a nozzle of improved design research work. To improve application efficiency of low-pressure nozzle of water mist in automatic fire-extinguishing system (AFS), the construction of centrifugal nozzles with swirl worm screw inserts was changed. The construction features of this sprayer, methods of its testing and obtained results these tests characteristics are presented.

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Duan, Yaoshuai, Zhiming Zhang, Binbin Lu, Boya Chen, and Zilong Lai. "The movement and forces of spinning solution in the nozzle during high-speed centrifugal spinning." Journal of Engineered Fibers and Fabrics 14 (January 2019): 155892501982820. http://dx.doi.org/10.1177/1558925019828207.

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High-speed centrifugal spinning is a novel method to fabricate nanofiber. It has the potential to fabricate nanofiber on a large scale because its production efficiency is much greater than traditional methods. Nozzle is an important part of high-speed centrifugal spinning equipment because its length, shape, and diameter all will affect the morphology and quality of nanofiber. It is useful to study the movement and forces of spinning solution in the nozzle. In this article, the principle and equipment structure of high-speed centrifugal spinning are briefly introduced at first. Then the movement and forces of spinning solution are analyzed by establishing parametric model at nozzle. It can be found that the spinning solution is ejected from nozzle when the rotating speed reaches a critical value. The critical rotating speed is inversely proportional to the radius of nozzle and directly proportional to the viscosity of spinning solution. There are several nozzle structures proposed and compared for nozzle optimization. Finally, the effects of nozzle parameters, concentration of spinning solution, and rotational speed on the morphology of nanofiber are verified by high-speed centrifugal spinning experiments. It lays the foundation for optimizing spinning equipment.

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Yan, Su Qian, and Sheng Tang. "Linear Regression Calculation and Energy Saving Analysis about Thermotechnical Parameters of Target Type Impinging Stream Nozzles." Advanced Materials Research 490-495 (March 2012): 2966–70. http://dx.doi.org/10.4028/www.scientific.net/amr.490-495.2966.

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To study the thermal property and the feasibility about the target type impinging stream nozzles, the thermotechnical parameters have been measured in Xi'an No.3 Textile mill. The equation between quantity of water and pressure, aperture, spacing has been established by regression analysis method. In the same way, the equation and the characteristic curve about efficiency and spacing, air mass velocity has been built. Comparing with the centrifugal nozzle, water distribution system about each nozzle has been calculated. Hydrographic net resistance of each kind of system has been calculated and the economical analysis has been done. It may provide a reference basis for choosing nozzle and designing the water spray chamber.

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6

Cao, Na, Liang Cao, Chang Cai Han, Qing Xu, Lan Lei, Ji Ye Du, Jun Xue, and Zhan Hong Zhang. "A Study of the Spray Characterization from a Centrifugal Nozzle by Pulsed Laser Holography." Applied Mechanics and Materials 152-154 (January 2012): 846–51. http://dx.doi.org/10.4028/www.scientific.net/amm.152-154.846.

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Centrifugal nozzle is an important part of an areoengine in which fuel atomization has strong influence on engine performance. For investigating the fuel spray characteristics, a promising method named off-axis particle holographic measuring system is used here. Characteristics of the nonevaporating spray ejected from a new type of centrifugal nozzle which would be used in the near future are obtained under various injection conditions. By automatic analysis of the holographic reconstructed droplets images, a hollow-cone shape spray with most droplets concentrated in the surface of the cone is observed, and the spray cone angle, droplet sizes and their spatial locations in concerned region are obtained quantitativly. In the near region of the nozzle exit, droplets show greater SMD value, while at a certain distance from the nozzle, the droplets SMD differences become unconspicuous which shows a better atomization. These informations are helpful to understand characteristics of the centrifugal nozzle and offer a database for validating the spray simulation code.

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7

Shuiqing, Zhou, Deng Hongying, Ma Yi, and Zhang Shengchang. "Investigation on the Performance of Forward Bending Fan." International Journal of Turbo & Jet-Engines 36, no. 2 (May 27, 2019): 207–17. http://dx.doi.org/10.1515/tjj-2016-0070.

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Abstract The forward bending centrifugal fan features long vanes and narrow passages, and the internal flow is apt to be affected by wall boundary layer of the blade surfaces. An aerodynamic investigation on the forward bending centrifugal fan is presented in this paper. The performances of the unsteady flow field in the centrifugal fan is predicted by solving the incompressible Reynolds-averaged Navier-Stokes (RANS) equations based on the Shear Stress Transport (SST) – Scale Adaptive Simulation (SAS) turbulence model. And three-dimensional (3-D) flow phenomenon of non-uniform fluid flow is discussed through observing the flow separation and vortex distribution in the impeller region. The installation location of inlet nozzle is finally adjusted based on the calculated results, and the centrifugal fan with eccentric inlet nozzle is proposed. From the results, the eccentric inlet nozzle with L=3 mm, θ=120° could improve the internal flow of the forward bending centrifugal fan and enhance its aerodynamic performance.

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Weitz, R. T., L. Harnau, S. Rauschenbach, M. Burghard, and K. Kern. "Polymer Nanofibers via Nozzle-Free Centrifugal Spinning." Nano Letters 8, no. 4 (April 2008): 1187–91. http://dx.doi.org/10.1021/nl080124q.

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Xalilov, Muxtor, and Rustam Yusupov. "Sprayer for chemical treatment of vineyards and orchards." E3S Web of Conferences 264 (2021): 04041. http://dx.doi.org/10.1051/e3sconf/202126404041.

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The authors have developed an improved sprayer for two-way chemical treatment of vineyards and orchards. The research aims to justify the design scheme and parameters of the sprayer. The proposed sprayer is equipped with a centrifugal fan, which directs air flow from the inlet window to two opposite sides. The distributor is designed as a truncated cone with an inlet nozzle on its small base and outlet nozzles equally spaced on its large base and connected to sprayers by flexible hoses of equal length. It is established that the diameter of the centrifugal fan wheel 630 mm, number of fan wheel rotations 1500 r/min, diameters of large and small distributor base as a truncated cone 90 mm and 18 mm respectively, the diameter of each nozzle set on its large base 3 mm, cone height 100 mm, number of atomizers 20 pieces and working liquid pressure in the system 0.40-0.45 MPa is provided a uniform distribution of working liquid.

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Ferrari, Nicola, Cecilia Ada Maestri, Paolo Bettotti, Mario Grassi, Michela Abrami, and Marina Scarpa. "Effect of Process Conditions and Colloidal Properties of Cellulose Nanocrystals Suspensions on the Production of Hydrogel Beads." Molecules 26, no. 9 (April 27, 2021): 2552. http://dx.doi.org/10.3390/molecules26092552.

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The influence of the physical, rheological, and process parameters on the cellulose nanocrystal (CNC) drops before and after external gelation in a CaCl2 solution was investigated. The dominant role of the CNC’s colloidal suspension properties, such as the viscous force, inertial, and surface tension forces in the fluid dynamics was quantitatively evaluated in the formation of drops and jellified beads. The similarity and difference between the behavior of carbohydrate polymers and rod-like crystallites such as CNC were enlightened. Pump-driven and centrifugally-driven external gelation approaches were followed to obtain CNC hydrogel beads with tunable size and regular shape. A superior morphological control—that is, a more regular shape and smaller dimension of the beads—were obtained by centrifugal force-driven gelation. These results suggest that even by using a simple set-up and a low-speed centrifuge device, the extrusion of a colloidal solution through a small nozzle under a centrifugal field is an efficient approach for the production of CNC hydrogel beads with good reproducibility, control over the bead morphology and size monodispersion.

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11

Valdberg, A. Y., K. P. Makeeva, and N. E. Nikolaikina. "The study of the disperse composition of the liquid torch spray of centrifugal-jet nozzle." Izvestiya MGTU MAMI 6, no. 2-4 (December 20, 2012): 7–11. http://dx.doi.org/10.17816/2074-0530-68213.

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This paper presents the results of a research on dispersion of water spray of centrifugal spray nozzle. The values of average droplet size are defined and compared with the known one calculated before. There were made graphics of drops dispersed distribution and graphics where the experimental and calculated values for the arithmetic mean and median mass diameter. The obtained data allow to recommend the calculated dependencies for the assessment of medium-sized drops in the spray of centrifugal-jet spray nozzle.

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12

Merchiers, Jorgo, Willem Meurs, Wim Deferme, Roos Peeters, Mieke Buntinx, and Naveen K. Reddy. "Influence of Polymer Concentration and Nozzle Material on Centrifugal Fiber Spinning." Polymers 12, no. 3 (March 5, 2020): 575. http://dx.doi.org/10.3390/polym12030575.

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Centrifugal fiber spinning has recently emerged as a highly promising alternative technique for the production of nonwoven, ultrafine fiber mats. Due to its high production rate, it could provide a more technologically relevant fiber spinning technique than electrospinning. In this contribution, we examine the influence of polymer concentration and nozzle material on the centrifugal spinning process and the fiber morphology. We find that increasing the polymer concentration transforms the process from a beaded-fiber regime to a continuous-fiber regime. Furthermore, we find that not only fiber diameter is strongly concentration-dependent, but also the nozzle material plays a significant role, especially in the continuous-fiber regime. This was evaluated by the use of a polytetrafluoroethylene (PTFE) and an aluminum nozzle. We discuss the influence of polymer concentration on fiber morphology and show that the choice of nozzle material has a significant influence on the fiber diameter.

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13

Xu, Huaizhong, Huanhuan Chen, Xianglong Li, Chen Liu, and Bin Yang. "A comparative study of jet formation in nozzle- and nozzle-less centrifugal spinning systems." Journal of Polymer Science Part B: Polymer Physics 52, no. 23 (September 30, 2014): 1547–59. http://dx.doi.org/10.1002/polb.23596.

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14

Li, Zhen, Shunqi Mei, Yajie Dong, Fenghua She, and Lingxue Kong. "High Efficiency Fabrication of Chitosan Composite Nanofibers with Uniform Morphology via Centrifugal Spinning." Polymers 11, no. 10 (September 24, 2019): 1550. http://dx.doi.org/10.3390/polym11101550.

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While electrospinning has been widely employed to spin nanofibers, its low production rate has limited its potential for industrial applications. Comparing with electrospinning, centrifugal spinning technology is a prospective method to fabricate nanofibers with high productivity. In the current study, key parameters of the centrifugal spinning system, including concentration, rotational speed, nozzle diameter and nozzle length, were studied to control fiber diameter. An empirical model was established to determine the final diameters of nanofibers via controlling various parameters of the centrifugal spinning process. The empirical model was validated via fabrication of carboxylated chitosan (CCS) and polyethylene oxide (PEO) composite nanofibers. DSC and TGA illustrated that the thermal properties of CCS/PEO nanofibers were stable, while FTIR-ATR indicated that the chemical structures of CCS and PEO were unchanged during composite fabrication. The empirical model could provide an insight into the fabrication of nanofibers with desired uniform diameters as potential biomedical materials. This study demonstrated that centrifugal spinning could be an alternative method for the fabrication of uniform nanofibers with high yield.

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15

Arkhipov, V. A., A. P. Berezikov, A. S. Zhukov, I. R. Akhmadeev, and S. S. Bondarchuk. "Laser diagnostics of the centrifugal nozzle spray cone structure." Russian Aeronautics (Iz VUZ) 52, no. 1 (March 2009): 120–24. http://dx.doi.org/10.3103/s1068799809010218.

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16

Bahree, R., A. M. Sharan, and J. S. Rao. "The Design of Rotor Blades Taking Into Account the Combined Effects of Vibratory and Thermal Loads." Journal of Engineering for Gas Turbines and Power 111, no. 4 (October 1, 1989): 610–18. http://dx.doi.org/10.1115/1.3240297.

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The present work involves the design of rotor blades based on the thermal as well as centrifugal and nozzle excitation forces in the transient state. The finite element analysis has been used to calculate these stresses. The nozzle excitation forces have been modeled as a series of impulses occurring at instants of time known from the solution of kinematic equations.

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17

Bardet, P. M., P. F. Peterson, and Ö. Savaş. "Annular swirling liquid layer with a hollow core." Journal of Fluid Mechanics 841 (March 1, 2018): 784–824. http://dx.doi.org/10.1017/jfm.2018.76.

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A thick turbulent annular liquid layer that swirls inside a fixed pipe is studied by means of surface observations and stereoscopic particle image velocimetry in an index-matched nozzle facility. This flow combines the complexities of swirling and free-surface turbulence. The free surface of the layer changes the boundary condition compared to filled swirling pipes and introduces the equivalent of a hollow core. The liquid layer shares similarities with turbulent open-channel flows, with the high centrifugal force across the layer having a similar effect to that of gravity in channel flows. At the surface, the restoring forces are surface tension and centrifugal acceleration. The particular nozzle under study has been envisioned for inertial confinement fusion, but the flow has relevance to systems such as compact separators or liquid rocket fuel injectors. Data are acquired at five downstream locations from the nozzle exit for four Reynolds numbers for subcritical flows. Injection flow rate and fluid kinematic viscosity are controlled independently, which allows adjusting independently the Reynolds and Taylor–Reynolds numbers. This also enables control of the centrifugal force at the free surface to test the effects of turbulence intensity on the free surface in regimes where air entrainment and droplet ejection occur. The swirl number is fixed by the design of the nozzle. From velocimetry data, mean velocity and turbulence statistics are extracted. For all the conditions tested, three flow regimes are identified: developing, developed, and transitional. The developed regime appears self-similar on the mean; the swirl creates a favourable pressure gradient that sustains the axial flow and confines the boundary layer near the wall. Large coherent vortex structures are identified in the layer. A simple model is proposed to describe the layer thickness and the velocity distribution in it. In the transitional regime, helical varicose waves generated by centrifugal instability are observed on the surface. Additionally, wall effects are visible in the bulk of the flow, and the main flow features are large overturning motions.

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18

Khamforoush, M., and T. Asgari. "A Modified Electro-Centrifugal Spinning Method to Enhance the Production Rate of Highly Aligned Nanofiber." Nano 10, no. 02 (February 2015): 1550016. http://dx.doi.org/10.1142/s1793292015500162.

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In this paper, for the aim of increasing the production rate of highly aligned nanofibers, electrocentrifuge spinning (ECS) technique was modified by equipping it with two nozzles as the spinneret. This new setup obviously doubles the production rate of nanofibers relative to the conventional ECS. To investigate the effect of this modification on the degree of nanofibers alignment (DeNA), the values of DeNA were measured for 30 distinctive experiments and the results were compared with that of ECS setup with a single nozzle. The originality of this work has lain in the fact that for these 30 experiments, which were designed by Design Expert Software (DES), the DeNA of the new ECS was the same as the conventional setup. Additionally, a spinneret with four nozzles was employed to evaluate the influence of number of nozzles on the DeNA. Lastly, the optimum values of voltage, polymer concentration, spinneret rotational speed and collector diameter were determined in order to maximize the DeNA of the modified ECS setup.

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19

Chen, Huanhuan, XiangLong Li, Nan Li, and Bin Yang. "Electrostatic-assisted centrifugal spinning for continuous collection of submicron fibers." Textile Research Journal 87, no. 19 (October 23, 2016): 2349–57. http://dx.doi.org/10.1177/0040517516671121.

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Non-uniformity of the fiber diameter and difficulty in continuous web collection have limited the development and further application of centrifugal spinning (CS). Here, we present a feasible method for fibers' continuous collection and morphology optimization by utilizing vertical electrostatic-assisted centrifugal spinning (E-CS). The effects of spinning parameters, such as applied voltage, nozzle size, and rotational speed on fiber morphology have been evaluated systematically. We find that vertical voltage is strongly correlated with the formation of bead defects, and nozzle size is the most important parameter on fiber size, and the fiber diameter generally decreased with increasing rotation speed. Through the mechanism analysis and jet trajectory observation, we think that the Rayleigh–Taylor instability is the key factor in determining fiber formation in CS. When a vertical electrostatic force is applied to CS, the above instability phenomenon can be effectively controlled resulting more uniform fibers with thinner diameters and fewer beads.

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Xu, Chen-Yang, Li-Li Wu, and Ting Chen. "Air velocity distribution of the circumferentially arranged nozzle group." Thermal Science 22, no. 4 (2018): 1589–93. http://dx.doi.org/10.2298/tsci1804589x.

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The air-flow field of the circumferentially arranged nozzle group is modeled and simulated. The air velocity distribution is measured using a hot wire anemometer. The results show that the simulated velocities coincide with the measured ones, confirming the effectiveness of the model. Larger rotating speeds can yield larger air velocities, indicating that introducing auxiliary air is favorable to the polymer drawing in the centrifugal spinning.

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Mishta, P. V., E. A. Mishta, and D. S. Blinov. "The motion of a solid spherical particle in a two-layer film of non-Newtonian fluid flowing through the inner surface of the centrifugal cone nozzle." Izvestiya MGTU MAMI 6, no. 2-4 (December 20, 2012): 33–39. http://dx.doi.org/10.17816/2074-0530-68241.

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The paper considers the motion of a solid spherical particle in a two-layer film of non-Newtonian fluid flowing through the inner surface of the centrifugal cone nozzle during the process of the application of film-forming coatings on granular materials.

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22

Oliveira, Vinicius Mendes Rodrigues de, João Alberto Fischer Filho, José Renato Zanini, and Luis César Dias Drumond. "Pressure compensation by a floppy disk in a sprinkler with rotation by centrifugal action." Semina: Ciências Agrárias 37, no. 5 (October 26, 2016): 2947. http://dx.doi.org/10.5433/1679-0359.2016v37n5p2947.

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Water wastage is a great concern worldwide. Water is effectively utilized by using equipment and systems that have more uniform water distribution. The objective of this study was to evaluate the performance of the FR Super 10 sprinkler with a pressure compensator under different pressures, spacing, and installation heights. The tests were performed in the laboratory, and pressure was controlled with two gauges calibrated with a mercury column. The distribution uniformity was measured using the Christiansen uniformity coefficient (CUC) and distribution uniformity coefficient (CUD). Four spray nozzles were utilized for the Super 10 sprinkler, at two heights (0.6 and 1.2 m), six pressures (25, 30, 35, 40, 45, and 50 m H2O), and six spacings (9 × 9, 9 × 10, 10 × 10, 9 × 12, 10 × 12, and 12 × 12 m). The blue, yellow, and red nozzles presented self-compensating features and the green nozzle was not fully self-compensating. The manufacturing coefficients of variations were lower in the nozzles with smaller apertures (blue and yellow) compared to those with larger apertures. Increasing the sprinkler height provided better water distribution uniformity and a better radial distribution profile, lowering the application rate near the sprinkler. Since this sprinkler compensates for pressure changes, pressure did not influence the sprinkler range.

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23

Lyamasov, A. A., B. M. Orahelashvili, and A. M. Gribkov. "Numerical Simulation of Double Surface Liquid Ejector with Flow Swirl for Centrifugal Pump." E3S Web of Conferences 320 (2021): 04003. http://dx.doi.org/10.1051/e3sconf/202132004003.

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Many systems with liquid ejectors and centrifugal pump are known. Often, jet pumps are used to provide a self-priming mode, as well as an acceptable pressure level for cavitation-free operation. The main disadvantage of such systems is the relatively low efficiency associated with the peculiarities of energy transfer in ejector. To increase efficiency double surface jet pump with driving and suction flow swirl (with circumferential component of velocity) is proposed. The active flow swirling is ensured by using of multi-nozzle tangential nozzle inlet and passive flow part by a special blade system. Combination of these factors makes it possible to improve the efficiency of energy conversion process. In comparison with the known design increases pump efficiency by 10 % – 15 %. Flow swirl also permits to reduce horizontal overall size by increasing the diffuser angle and reducing the mixing chamber length. These positive effects can be achieved by using methods and recommendations given in this paper. The paper also includes ANSYS CFX numerical simulation study results of double surface jet pump and analysis of the impact of nozzle position, length of the mixing chamber and other geometry parameters on pump performance. The results allow optimize the constructive solutions.

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Dix, J., A. J. Saddington, K. Knowles, and M. A. Richardson. "Infra-red signature reduction study on a small-scale jet engine." Aeronautical Journal 109, no. 1092 (February 2005): 83–88. http://dx.doi.org/10.1017/s0001924000000580.

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Abstract This paper presents infra-red signature data for a small-scale, low pressure ratio turbojet engine typical of that used in unmanned air vehicle applications. The aim of the study was to test a number of different convergent nozzle designs concentrating on those with trailing edge modifications. The engine used in the tests has a single stage centrifugal compressor and radial inflow turbine and is designed to produce approximately 150N of thrust at 103,500rpm using liquid propane fuel. The test rig consisted of a calibrated thrust stand whilst the engine was controlled through an electronic engine control unit and laptop PC. The jet plume was visualised using an infra-red spectroradiometer which yielded qualitative data across the infra-red spectrum. Simultaneous measurements were also made of the engine thrust. A Pitot probe was used to take pressure readings across different sections of the exhaust flow. Analysis of the infrared signature of the engine exhaust plume and any thrust penalty yielded a performance comparison for each of the nozzles tested. Correlation of engine thrust with engine rpm showed that, within the accuracy of the measurements, there was no significant thrust penalty associated with the notched nozzles. Infra-red imagery of the plain and 60° notched nozzles indicated that the latter reduced the length of the hottest part of the exhaust plume by approximately 33%. The spectroradiometer data shows a significant reduction in spectral radiance for the CO2 wavelength of approximately 4·3µm when the notched nozzles are used. The 60° notched nozzle appeared to perform best in reducing the spectral radiance at this wavelength. Centreline total pressure measurements in the exhaust plume correlated well with the infra-red imagery in that a potential core length reduction of up to 30% could be achieved using the 60° notched nozzle. Total pressure contours recorded 20mm (0·43D) downstream of the nozzle exit plane suggest that the notched nozzles are promoting increased mixing through radial spreading of the jet possibly associated with increased streamwise vorticity (although the latter could not be confirmed). There were also signs that the jet plumes being investigated were swirling.

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Sokovnin, O. M., I. V. Flegentov, and V. A. Polovnikov. "Flow of an anomalous viscous fluid in a centrifugal jet nozzle." Journal of Engineering Physics 57, no. 6 (December 1989): 1415–20. http://dx.doi.org/10.1007/bf00871382.

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Zhang, Zhi-Ming, Yao-Shuai Duan, Qiao Xu, and Biao Zhang. "A review on nanofiber fabrication with the effect of high-speed centrifugal force field." Journal of Engineered Fibers and Fabrics 14 (January 2019): 155892501986751. http://dx.doi.org/10.1177/1558925019867517.

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Among the traditional methods for nanofiber fabrication, their inherent defects limit their application in industry. This work presents a simple and novel spinning technology to fabricate nanofiber, which uses a high-speed rotary spinneret called high-speed centrifugal spinning. Unlike electrospinning, the electric field is not required, and it could fabricate nanofiber in bulk from melt or solution materials. This work introduces the mechanism principle and development of high-speed centrifugal spinning. Besides, the high-speed centrifugal spinning is compared with the traditional spinning methods. The jet movement and nanofiber formation process under the action of centrifugal force are explained in detail. The effects of equipment parameters and spinning solution parameters on final nanofiber morphology are presented. These parameters are controllable, they include rotational speed of spinneret, length and diameter of nozzle, spinning solution concentration, spinning solution viscosity and surface tension, and collection distance.

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Karakoc, T. Hikmet, and Onder Turan. "Exergetic Destruction Effects of Operating Conditions on the Turbojet Engine Components." Applied Mechanics and Materials 110-116 (October 2011): 2390–94. http://dx.doi.org/10.4028/www.scientific.net/amm.110-116.2390.

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The minimization of exergy destruction brings the design as closely as permissible to the theoretical limit. This study presents exergy destruction analysis of a turbojet engine for different flight Mach number and altitudes. Turbojet engine being considered consists of an inlet, a centrifugal compressor, reverse flow combustion chamber, axial-flow turbine and exhaust nozzle. The flight Mach number and altitude are examined on the exergetic destructions of compressor, combustion chamber, turbine and exhaust nozzle. The results of component-based destruction analysis are given as three dimensional exergetic-destruction response surface plots related to altitude and flight Mach number.

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YAMASE, Hideyuki, Tomoki NAKAJIMA, Hoshio TSUJITA, Akira IWAKAMI, and Taichi KIMURA. "126 Control of Surge in Centrifugal Compressor by Using a Nozzle Injection System : Influence of Nozzle Opening Width." Proceedings of Conference of Tohoku Branch 2016.51 (2016): 49–50. http://dx.doi.org/10.1299/jsmeth.2016.51.49.

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29

Satish, Shirolkar, and Rodge Priya. "A mini review on centrifugal spinning technique for production of nanofibers and its applications in drug delivery." Journal of medical pharmaceutical and allied sciences 11, no. 1 (January 30, 2022): 4349–52. http://dx.doi.org/10.55522/jmpas.v11i1.2176.

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Nanofibers possess distinctive physicochemical and biological properties and have been utilized in a wide range of research and commercial applications. Electrospinning is a widely used technology for generating nanofibers, but due to its low production rate, it lacks scalability. Centrifugal spinning is a low-cost process for producing nanofibers that is simple, quick, and scalable. It has emerged as a potential technology for fabricating nanofibers with a variety of applications due to its extremely high production rate and multifaceted features. The centrifugal spinning process involves injecting the polymer solution or melt in a rotating spinneret. When the spinning head reaches a critical speed, the centrifugal force overcomes the surface tension of the spinning liquid, and a liquid jet ejects from the nozzle tip. The jet is then stretched further, resulting in solidified nanofibers on the collector. The technique is capable of producing 3D nanofiber scaffolds from various polymers for biomedical applications. This paper describes in details the centrifugal spinning process, its classification, principle and applications of the centrifugal spun nano/micro fibers in drug delivery and wound dressing. Keywords: Nanofibers, Centrifugal spinning, Solubility enhancement, drug delivery.

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Hirano, Toshiyuki, Takanori Uchida, and Hoshio Tsujita. "Control of Surge in Centrifugal Compressor by Using a Nozzle Injection System: Universality in Optimal Position of Injection Nozzle." International Journal of Rotating Machinery 2012 (2012): 1–8. http://dx.doi.org/10.1155/2012/259293.

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The passive control method for surge and rotating stall in centrifugal compressors by using a nozzle injection system was proposed to extend the stable operating range to the low flow rate. A part of the flow at the scroll outlet of a compressor was recirculated to an injection nozzle installed on the inner wall of the suction pipe of the compressor through the bypass pipe and injected to the impeller inlet. Two types of compressors were tested at the rotational speeds of 50,000 rpm and 60,000 rpm with the parameter of the circumferential position of the injection nozzle. The present experimental results revealed that the optimum circumferential position, which most effectively reduced the flow rate for the surge inception, existed at the opposite side of the tongue of the scroll against the rotational axis and did not depend on the compressor system and the rotational speeds.

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31

Morinushi, Ken. "The Influence of Geometric Parameters on F. C. Centrifugal Fan Noise." Journal of Vibration and Acoustics 109, no. 3 (July 1, 1987): 227–34. http://dx.doi.org/10.1115/1.3269425.

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In this report, through experiments the influence of five major geometric parameters on noise and aerodynamic performance of forward curved (F.C.) centrifugal fans was studied. The parameters considered are: (1) width-inner diameter ratio of impeller, (2) axial clearance between the fan inlet nozzle and the impeller shroud plate, (3) blade-setting angle, (4) blade pitch-chord ratio, and (5) spiral extension index of the scroll. Noise characteristics were evaluated by means of the specific noise level (A-weighted) at every operating point except the surging region. The optimal values for the parameters to realize low noise are discussed. Design diagrams for low noise F.C. centrifugal fans are shown.

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32

Skoch, Gary J. "Experimental Investigation of Diffuser Hub Injection to Improve Centrifugal Compressor Stability." Journal of Turbomachinery 127, no. 1 (January 1, 2005): 107–17. http://dx.doi.org/10.1115/1.1812779.

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Results from a series of experiments to investigate whether centrifugal compressor stability could be improved by injecting air through the diffuser hub surface are reported. The research was conducted in a 4:1 pressure ratio centrifugal compressor configured with a vane-island diffuser. Injector nozzles were located just upstream of the leading edge of the diffuser vanes. Nozzle orientations were set to produce injected streams angled at −8, 0, and +8 degrees relative to the vane mean camber line. Several injection flow rates were tested using both an external air supply and recirculation from the diffuser exit. Compressor flow range did not improve at any injection flow rate that was tested, and generally diminished as injection rate increased. Compressor flow range did improve slightly at zero injection due to the flow resistance created by injector openings on the hub surface. Resistance and flow range both increased as the injector orientation was turned toward radial. Leading edge loading and semivaneless space diffusion showed trends that are similar to those reported earlier from shroud surface experiments that did improve compressor range. Opposite trends are seen for hub injection cases where compressor flow range decreased. The hub injection data further explain the range improvement provided by shroud-side injection and suggest that stability factors cited in the discussion of shroud surface techniques are valid. The results also suggest that a different application of hub-side techniques may produce a range improvement in centrifugal compressors.

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33

MORISHITA, Etsuo. "Analogy between Laval Nozzle and One-Dimensional Compressible Flow under Centrifugal Force." TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES 53, no. 182 (2011): 323–24. http://dx.doi.org/10.2322/tjsass.53.323.

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34

Hayashi, Hiromichi, and Seichi Takeda. "SPRAY DRYING CHARACTERISTICS BY A CENTRIFUGAL PRESSURE NOZZLE WITH LARGE ORIFICE DIAMETER." Drying Technology 4, no. 3 (August 1986): 331–42. http://dx.doi.org/10.1080/07373938608916333.

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35

ATARASHI, Ryosuke, Hoshio TSUJITA, Takahiro BAMBA, and Atsushi YONEMURA. "Control of Surge in Centrifugal Compressor by Using a Nozzle Injection System." Proceedings of Conference of Tohoku Branch 2019.54 (2019): 113. http://dx.doi.org/10.1299/jsmeth.2019.54.113.

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36

Wu, Jin Xiang, En Yu Wang, Lian Sheng Liu, and Xiang Gou. "Investigation of Shapes and Extinction Limits of Premixed Flames in Large Centrifugal Acceleration Field." Advanced Materials Research 455-456 (January 2012): 327–33. http://dx.doi.org/10.4028/www.scientific.net/amr.455-456.327.

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This paper presents the influence of the body-force in large centrifugal acceleration field on the shapes and extinction limits of the premixed flame of liquefied petroleum gas (LPG) and air. Experiments of combustion in various centrifugal acceleration fields were performed. The results indicate that the magnitude of the resultant body-force, composed mainly of centrifugal force and Coriolis force, is not the only cause of the extinction of flames, but the direction between the resultant body-force and jet direction of the premixed gases plays more important role. Coriolis force, which is always perpendicular to jet direction of the gases, results in the flame turning to sides of the nozzle, even extinction. The buoyancy effect is the mainly element to make the flame shape change: shorten, lengthen or deflect, and improve or weaken combustion. It is favorable for stability of the flame as the included angle of rotating tangent direction to gas flow jet direction is positive.

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37

Huber, S. R., and A. Bauder. "Reanalysis of the Nuclear Quadrupole Coupling in the Rotational Spectrum of N-Methylpyrrole." Zeitschrift für Naturforschung A 49, no. 11 (November 1, 1994): 1063–66. http://dx.doi.org/10.1515/zna-1994-1112.

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Abstract The rotational spectrum of N-methylpyrrole has been measured with pulsed nozzle Fourier transform microwave spectrometers between 6 and 38 GHz. The quadrupole hyperfine structure due to 14N has been reanalyzed in the A (m = 0) state o f the methyl internal rotation. Improved rotational constants, centrifugal distortion constants, and quadrupole coupling constants have been simultaneously determined from the measured transition frequencies in an iterative least-squares fit.

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38

Wang, Yi, and De Ping Zhu. "A New Spray Desuperheater Structure Design." Advanced Materials Research 718-720 (July 2013): 1630–33. http://dx.doi.org/10.4028/www.scientific.net/amr.718-720.1630.

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A new spray desuperheater is designed, whose characteristic is using the combination technology of centrifugal nozzle and two-level venturi pipes. According to the application of the technology, the paper reveals the technical principle and structure design. The spray desuperheater has excellent spray atomization effect, and it can regulate the steam temperature in a wide range. So it can ensure the efficient heat exchanger and safe operation for boiler.

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39

Liffman, Kurt. "An Analytic Flow Solution for YSO Jets." Publications of the Astronomical Society of Australia 15, no. 2 (1998): 259–64. http://dx.doi.org/10.1071/as98259.

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AbstractWe present an analytic solution for a jet flow from a young stellar object (YSO). This solution allows us to compute the speed, density, and magnetic field strength of the flow, but it is only true if YSO jet flows are powered by toroidal magnetic fields. We illustrate how the balance between centrifugal force and magnetic pressure provides the converging/diverging nozzle shape required to accelerate the flow.

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40

Liu, Jia-Jia, Ting Chen, and Li-Li Wu. "Exploring the Polymer Drawing of the Air Centrifugal Spinning." Recent Patents on Nanotechnology 13, no. 3 (January 28, 2020): 189–95. http://dx.doi.org/10.2174/1872210513666191015143652.

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Background and Objective: The air-flow field of the air centrifugal spinning is simulated and measured. The simulated air velocities coincide well with the measured ones, confirming the correctness of the air-flow field model. Methods: The polymer drawing in the air-flow field of the air centrifugal spinning is modeled and simulated. Effects of the rotation speed and initial air velocity on the diameter and radius vector of the threadline are investigated. Results: The air velocity is found to decrease with the increase of the distance away from the nozzle exit. Simulation results show that both larger rotation speed and higher initial air velocity can reduce the threadline diameter. Conclusion: The radius vector of the threadline increases rapidly with the increase of the initial air velocity, which is helpful to reduce the threadline diameter.

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NAKAJIMA, Tomoki, Ryosuke ATARASHI, Hoshio TSUJITA, Akira IWAKAMI, TAKAHIRO Bamba, and Taichi KIMURA. "102 Control of Surge in Centrifugal Compressor by Using a Nozzle Injection System." Proceedings of Conference of Tohoku Branch 2018.53 (2018): 3–4. http://dx.doi.org/10.1299/jsmeth.2018.53.3.

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42

Azimi-Boulali, Javid, Masoud Madadelahi, Marc J. Madou, and Sergio O. Martinez-Chapa. "Droplet and Particle Generation on Centrifugal Microfluidic Platforms: A Review." Micromachines 11, no. 6 (June 22, 2020): 603. http://dx.doi.org/10.3390/mi11060603.

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The use of multiphase flows in microfluidics to carry dispersed phase material (droplets, particles, bubbles, or fibers) has many applications. In this review paper, we focus on such flows on centrifugal microfluidic platforms and present different methods of dispersed phase material generation. These methods are classified into three specific categories, i.e., step emulsification, crossflow, and dispenser nozzle. Previous works on these topics are discussed and related parameters and specifications, including the size, material, production rate, and rotational speed are explicitly mentioned. In addition, the associated theories and important dimensionless numbers are presented. Finally, we discuss the commercialization of these devices and show a comparison to unveil the pros and cons of the different methods so that researchers can select the centrifugal droplet/particle generation method which better suits their needs.

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43

Lin, Shun Hong, Jian Ping Ding, Dai Chuan Chen, and Ming Xu. "Analysis of Dynamic Characteristics of Key Parts of Centrifugal Atomizer in Waste to Energy." Applied Mechanics and Materials 201-202 (October 2012): 175–80. http://dx.doi.org/10.4028/www.scientific.net/amm.201-202.175.

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Uneven distribution of mass and temperature usually have important effects on the dynamic characteristics of rotary mechanism. Based on thermal-structural coupling theory, dynamic response analyses of the flexible rotor of centrifugal atomizer can be done by FEM. Considering eccentric quantity is caused by nozzle clogging and axial non-uniform distribution of temperature, the dynamic characteristics of the is studied; the response of mass unbalance and thermal bending or coupled the both is researched and compared. It is shown from the calculation that all of the three conditions have affected the dynamic characteristics of rotor system and the design can basically meet the stable operation requirement of the atomizer. The results can be applied to improve the design of the centrifugal atomizer. Developing more detail analysis to optimize the design in the future research.

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44

Lei, Zhang, Wang Rui, Yuan Wei, and Wang Songling. "Simulation of air jets for controlling stall in a centrifugal fan." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 229, no. 11 (September 18, 2014): 2045–55. http://dx.doi.org/10.1177/0954406214553019.

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The main goal of the present work is to analyze the three-dimensional unsteady flow field of a centrifugal fan by solving Navier–Stokes equations, coupled with the throttle condition. The results show that rotating stall occurs in the original fan when the flow rate is 4.30 m3/s, and the stall inception first appears at three impeller passages near the volute tongue and front disc. An active control method is proposed to inhibit the stall inception, which involves blowing air at the inlets of the three impeller passages. This blowing control method cannot inhibit the stall inception when the blowing speed is lower than 50 m/s. The stability margin of the centrifugal fan is extended when the blowing speed is increased from 50 to 110 m/s, while no further effect is obvious with a further increase in the blowing speed. At a blowing speed of 110 m/s, rotating stall occurs again when the fan flow reaches 3.46 m3/s. After the application of the nozzle blowing, the safety margin of the centrifugal fan is extended by 13%, and an obvious stability enhancement effect is achieved. From an engineering standpoint, this new active control method for rotating stall offers a valuable means to ensure the safe operation of a centrifugal fan.

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45

Cao Na, 曹娜, 徐青 Xu Qing, 韩长才 Han Changcai, 马继明 Ma Jiming, 宋岩 Song Yan, and 宋文艳 Song Wenyan. "Study of a Centrifugal Nozzle Spray Characterization in Space Based on Off-Axis Holography." Chinese Journal of Lasers 47, no. 11 (2020): 1109001. http://dx.doi.org/10.3788/cjl202047.1109001.

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46

Lai, Zilong, Jiawei Wang, Kang Liu, Wenhui Li, Zhiming Zhang, and Boya Chen. "Research on rotary nozzle structure and flow field of the spinneret for centrifugal spinning." Journal of Applied Polymer Science 138, no. 33 (April 8, 2021): 50832. http://dx.doi.org/10.1002/app.50832.

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47

Azarov, Artem V., Natalia S. Zhukova, I. V. Stefanenko, and M. A. Nikolenko. "Aerosol Systems of Supply Ventilation, as Means of Air Quality Improvement of Working Zones." Applied Mechanics and Materials 875 (January 2018): 128–31. http://dx.doi.org/10.4028/www.scientific.net/amm.875.128.

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Article is devoted to a research of aerosol systems of supply ventilation. Expediency of creation and use of water and aerosol systems for decrease in concentration of fine-dispersion dust in working zones, and as a result, decrease in negative impact on operators of various productions is proved. The design of a centrifugal mechanical one-slot-hole nozzle is proposed. Problems of dust content in air of a working zone and impact of particles of PM10 and PM2,5 on an organism of workers are considered.

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48

Rekstin, A., K. Soldatova, Y. Galerkin, and E. Popova. "Verification of a simplified mathematical model of centrifugal compressor stages." E3S Web of Conferences 124 (2019): 01007. http://dx.doi.org/10.1051/e3sconf/201912401007.

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To calculate the efficiency of a centrifugal compressor, it is sufficient to know the design parameters and similarity criteria: flow rate coefficient, loading factor, relative hub ratio, Mach number. The effect of the inlet nozzle and the diffuser type is also taken into account. The original simplified model was successfully used for calculation of compressors’ candidates in computer programs of the Universal Modelling Method. Recently, the model has undergone significant revision and been remade. The modernized model is used in the program for primary design of centrifugal compressors. The authors verified the new model, comparing the calculated efficiency with the measured efficiency of several dozens of model stages 21CV family and low flow rate model stages. In total, calculations were carried out for more than thirty model stages. The range of design parameters of analysed model stages is quite wide: flow rate coefficient 0.00564 – 0.0676; loading factor 0.384 – 0.742; hub ratio 0.258 – 0.466.

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CHAKRABARTI, K., M. M. MAJUMDAR, and SANDIP K. CHAKRABARTI. "ACCRETION ONTO COMPACT OBJECTS VIEWED AS A FLOW IN CONVERGING-DIVERGING DUCTS." International Journal of Modern Physics D 17, no. 05 (May 2008): 799–814. http://dx.doi.org/10.1142/s0218271808012504.

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Black hole accretion is necessarily transonic and the number of physical sonic points depends on the angular momentum of the flow. We study the properties of such a flow by recasting this idea into an engineering problem in which a flow has a subsonic to supersonic transition when it passes through a de Laval nozzle, i.e. a converging and diverging duct in a flat geometry in the presence of sufficient end pressure difference. Particularly interesting is the case of the centrifugal pressure supported standing shock formation inside an accretion flow, because the flow passes through at least two saddle type sonic points, one before and one after the shock. In this case, the duct itself has two minima and a maximum. We study the properties of such a duct as a function of the inflow parameters and classify all possible types of the flow through this composite nozzle.

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Turan, Onder, and T. Hikmet Karakoc. "Exergetic and Energetic Response Surfaces for Small Turbojet Engine." Applied Mechanics and Materials 110-116 (October 2011): 1054–58. http://dx.doi.org/10.4028/www.scientific.net/amm.110-116.1054.

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Exergy analysis permits meaningful efficiencies to be evaluated for a system or process, and the sources, causes and locations of thermodynamic losses to be determined. This study presents exergetic modeling of a small turbojet engine via exergetic response surfaces. Turbojet engine consists of an inlet, a centrifugal compressor, reverse flow combustion chamber, axial-flow turbine and exhaust nozzle. The flight Mach number and altitude are examined on the exergetic efficiencies of total engine performance. The results of analysis are given as three dimensional exergetic response surface plots related to these operating parameters.

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Journal articles on the topic 'Centrifugal nozzle'

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