Gotowe bibliografie tematyczne / Spinneret Designs

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Gotowa bibliografia na temat „Spinneret Designs”

Autor: Grafiati

Data publikacji: 6 września 2023

Data aktualizacji: 7 września 2023

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Artykuły w czasopismach na temat "Spinneret Designs"

Gursoy, Akin, Kamran Iranshahi, Kongchang Wei, Alexis Tello, Efe Armagan, Luciano F. Boesel, Fabien Sorin, René M. Rossi, Thijs Defraeye i Claudio Toncelli. "Facile Fabrication of Microfluidic Chips for 3D Hydrodynamic Focusing and Wet Spinning of Polymeric Fibers". Polymers 12, nr 3 (10.03.2020): 633. http://dx.doi.org/10.3390/polym12030633.

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Microfluidic wet spinning has gained increasing interest in recent years as an alternative to conventional wet spinning by offering higher control in fiber morphology and a gateway for the development of multi-material fibers. Conventionally, microfluidic chips used to create such fibers are fabricated by soft lithography, a method that requires both time and investment in necessary cleanroom facilities. Recently, additive manufacturing techniques were investigated for rapid and cost-efficient prototyping. However, these microfluidic devices are not yet matching the resolutions and tolerances offered by soft lithography. Herein, we report a facile and rapid method using selected arrays of hypodermic needles as templates within a silicone elastomer matrix. The produced microfluidic spinnerets display co-axially aligned circular channels. By simulation and flow experiments, we prove that these devices can maintain laminar flow conditions and achieve precise 3D hydrodynamic focusing. The devices were tested with a commercial polyurethane formulation to demonstrate that fibers with desired morphologies can be produced by varying the degree of hydrodynamic focusing. Thanks to the adaptability of this concept to different microfluidic spinneret designs—as well as to its transparency, ease of fabrication, and cost-efficient procedure—this device sets the ground for transferring microfluidic wet spinning towards industrial textile settings.

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Wang, Xin, Yuan Zhao, Hao Wang i Guang Ming Cai. "Electric Field and Spinning Performance in Needleless Electrospinning". Advanced Materials Research 1048 (październik 2014): 26–30. http://dx.doi.org/10.4028/www.scientific.net/amr.1048.26.

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Different spinnerets can be used to generate needleless electrospinning with the potential to scale up the production of nanofibers. However, the electrospinning performance, normally refers to the quality of the as-spun fiber and the production rate, is dramatically different from different spinnerets. This study focuses on the electric field of different spinnerets under the same experimental parameters so as to understand the key factors that affect the electrospinning performance of upward needleless electrospinning. Modeling analysis suggested that the electric field could be further concentrated by optimizing the geometry of spinneret. Experimental investigation on needleless electrospinning from different spinnerets proved that the electrospinning performance was improved greatly with the optimization of the electric field of spinneret. Understanding of the relationship between electric field and spinning performance would benefit the design and development of needleless electrospinning.

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Gao, Wei Jie, Xiao E. Wang, Kun Wang, Jie Fan i Yong Liu. "Preparation of Continuous Electrospun Nanofiber Yarn with an Auxiliary Rotating Circular Plate". Applied Mechanics and Materials 423-426 (wrzesień 2013): 109–12. http://dx.doi.org/10.4028/www.scientific.net/amm.423-426.109.

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Nanofiber yarn, since it might be used in weaving and knitting, has been of great interest recently due to the potential application in many fields. A modified method to produce continuous nanofiber yarn using two oppositely spinnerets system with an auxiliary rotating circular plate is suggested in this work. The influence of process parameters, such as applied voltage, spinneret-plate distance and the angle between the two spinnerets, on the morphologies and properties of nanofiber yarn were investigated in detail. The optimum process parameters obtained include that the applied voltage was 15kv, the spinneret-plate distance was 7cm and the angle between the two spinnerets was 130o. The mechanical properties of these yarns have been evaluated, including twist and tensile strength. This work can provide a novel and general approach to design and produce nanofiber yarns for textiles, biomedical and industrial applications.

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Widjojo, Natalia, Tai-Shung Chung, Davis Yohanes Arifin, Martin Weber i Volker Warzelhan. "Elimination of die swell and instability in hollow fiber spinning process of hyperbranched polyethersulfone (HPES) via novel spinneret designs and precise spinning conditions". Chemical Engineering Journal 163, nr 1-2 (wrzesień 2010): 143–53. http://dx.doi.org/10.1016/j.cej.2010.07.048.

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Potter, Gregory, Raul Barbosa, Alexa Villarreal, Alexandra Salinas, Hector Guzman, Heriberto De Leon, Javier A. Ortega i Karen Lozano. "Design and Validation of a Portable Handheld Device to Produce Fine Fibers Using Centrifugal Forces". Instruments 4, nr 3 (14.09.2020): 27. http://dx.doi.org/10.3390/instruments4030027.

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In the present research project, a novel portable battery-powered handheld device able to produce micron and submicron fibers using centrifugal forces is proposed. The design includes spinnerets with a clamshell configuration with multiple chambers or reservoirs (2, 4, and 8) and different exit orifice diameters (400, 500, 600, and 800 µm). The rotational speed is controlled via an Arduino microcontroller. To validate the design, a series of experiments were conducted and the effect of the orifice diameter, number of chambers, and velocity on the resulting fibers’ diameter and yield was studied. For the experiments, a polymeric solution of Polyvinyl Alcohol (PVA) was prepared. The fiber yield was gravimetrically quantified, and the fiber morphology and diameter were analyzed by means of scanning electron microscopy (SEM). The experimental results showed that spinnerets with an orifice diameter of 500 microns yielded the greatest amount of fibers (0.0777 g). In addition, the number of chambers also affected the amount of fibers produced, and it was determined that the fiber diameter size is dependent on the spinneret speed. Fibers 80 nm in diameter were observed at 6500 rpm.

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Han, Koohee, Gašper Kokot, Shibananda Das, Roland G. Winkler, Gerhard Gompper i Alexey Snezhko. "Reconfigurable structure and tunable transport in synchronized active spinner materials". Science Advances 6, nr 12 (marzec 2020): eaaz8535. http://dx.doi.org/10.1126/sciadv.aaz8535.

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Ensembles of actuated colloids are excellent model systems to explore emergent out-of-equilibrium structures, complex collective dynamics, and design rules for the next generation materials. Here, we demonstrate that ferromagnetic microparticles suspended at an air-water interface and energized by an external rotating magnetic field spontaneously form dynamic ensembles of synchronized spinners in a certain range of the excitation field parameters. Each spinner generates strong hydrodynamic flows, and collective interactions of the multiple spinners promote a formation of dynamic lattices. On the basis of experiments and simulations, we reveal structural transitions from liquid to nearly crystalline states in this novel active spinner material and demonstrate that dynamic spinner lattices are reconfigurable, capable of self-healing behavior and that the transport of embedded inert cargo particles can be remotely tuned by the parameters of the external excitation field. Our findings provide insights into the behavior of active spinner materials with reconfigurable structural order and tunable functionalities.

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Taylor, R. A., i R. S. Brown. "A Design for Spinning Tension Control". Journal of Engineering for Industry 107, nr 2 (1.05.1985): 220–27. http://dx.doi.org/10.1115/1.3185987.

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A new cap-spinning design is described. A unique feature enables the cap to be operated at different speeds from the bobbin to increase or decrease yarn tension as needed. The new spinner will operate as a modification on a conventional ring spinning frame. However, it eliminates the need for rings and travelers. Due to the spinners independent tension control, it can be operated at extremely high speeds without increasing the ends down rate. Yarn grade and tension comparisons with a ring spinning are reported.

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II, Terry F. Pettijohn, i Victoria Riley-Lomedico. "Using Fidget Spinners and Stress Balls Do Not Impact College Introductory Psychology Test Scores". Advances in Research 24, nr 6 (29.08.2023): 9–13. http://dx.doi.org/10.9734/air/2023/v24i6978.

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Aim: To determine if the use of fidget spinners and stress balls impact college test scores in Introductory Psychology courses. Study Design: A between-participants experimental design was used. Students were randomly assigned into conditions. Place and Duration of Study: The study was conducted at Coastal Carolina University, Conway, South Carolina, USA. Fall semester. Methodology: 170 college students enrolled in Introductory Psychology courses participated in the study. Participants were randomly assigned to use a fidget spinner, a stress ball, or sit quietly for 3 minutes before a unit test in their Introductory Psychology course. Results: Quantitative data was analyzed using SPSS. There were no statistically significant differences in test scores between the three groups (P=.28). The fidget spinner group (M=75.82, SD=13.12), the stress ball group (M=76.41, SD=13.89), and the control group (M=79.33, SD=11.17) scored similarly to each other on the unit test. Conclusion: Using fidget spinners or stress balls do not impact Introductory Psychology test scores.

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Wang, Dong, Yang Zhou i Chong Chang Yang. "Study and Design on the Automatic Drying Machine of Spinneret". Advanced Materials Research 945-949 (czerwiec 2014): 1318–21. http://dx.doi.org/10.4028/www.scientific.net/amr.945-949.1318.

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This paper introduced spinneret cleaning technology. Aiming at the probles of noisy, low-efficiency, high-intensity, artificial drying in actual spinneret drying process of the factory, the process of spinneret automatic drying is studied and an automatic spinneret drying machine is designed. An experiment is conducted on the prototype of the machine, which shows that the work efficiency has increased dramatically and the noise has decreased obviously.

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Afzal, Ali, Jean-Yves Drean, Omar Harzallah, Nabyl Khenoussi, Sheraz Ahmad i Niaz-Ahmad Akhtar. "Development of multifunctional different cross-sectional shaped coaxial composite filaments for SMART textile applications". Textile Research Journal 87, nr 16 (2.09.2016): 1991–2004. http://dx.doi.org/10.1177/0040517516663144.

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The aim of this study is to design a spinneret that can be used efficiently for the manufacturing of coaxial composite filaments. Poly(ethylene terephthalate) was used as resin matrix with 99.9% pure copper filament as the core. The characterization of the polymer was done to determine polymer thermal and rheological properties. Multi-shaped coaxial composite filaments were obtained after successful laboratory-scale melt extrusion machine modification and spinneret development. The cross-sectional surface and shape were analyzed with a scanning electron microscope. Coaxial filaments having the cross-section including elliptical, triangular, rectangular and circular shapes were developed. The characterization of spinneret design and coaxial composite filaments were also reported. The effect of spinneret design parameters on the cross-sectional shape of the filament were analyzed.

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Rozprawy doktorskie na temat "Spinneret Designs"

Sucosky, Philippe. "Flow Characterization and Modeling of Cartilage Development in a Spinner-Flask Bioreactor". Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/6875.

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Bioreactors are devices used for the growth of tissues in a laboratory environment. They exist in many different forms, each designed to enable the production of high-quality tissues. The dynamic environment within bioreactors is known to significantly affect the growth and development of the tissue. Chondrocytes, the building blocks of articular cartilage, for example, are stimulated by mechanical stresses such as shear, as compared with those in tissues grown under static incubation conditions. On the other hand, high shear can damage cells. Consequently the shear-stress level has to be controlled in order to optimize the design and the operating conditions of bioreactors. Spinner flasks have been used for the production of articular cartilage in vitro. Assuming the existence of a relation between the cellular glycosaminoglycan (GAG) synthesis and the local shear stresses on the construct surfaces, this research focuses on the development of a model for cartilage growth in such devices. The flow produced in a model spinner flask is characterized experimentally using particle-image velocimetry (PIV). A computational fluid dynamic (CFD) model validated with respect to the laboratory measurements is constructed in order to predict the local shear stresses on the construct surfaces. Tissue growth experiments conducted in the prototype bioreactor permit construct histologies and GAG contents to be analyzed and then correlated with the shear-stress predictions. The integration of this relation into the CFD model enables the prediction of GAG synthesis through convective effects. Coupling this convective model to an existing diffusive model produces a complete cartilage-growth model for use in aiding the optimization of existing bioreactors, and in the design of new ones.

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Jeník, Jan. "Optimalizace konstrukce zvedače dutinky spřádacího stroje". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-230327.

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The first part of this thesis describes the current technologies of mechanical spin-ning. This is a ring, rotor and air-jet spinning. The product of spinning machines is yarn, the basic material for production textile. The next section describes in detail the current state of the node manipulator lifter tube on spinning machine TORNADO J20, by concern RIETER. It describes the structure, kinematics, duty cycle and requirements for the manipulator. The following optimization options which are described more options for solutions of individual functions of the manipulator, on the end is selected by multi-criteria analysis. The best solution that is elaborate in the next section. The author has created 3-D model optimized lifter tube. Positioning mechanism maintains the current kinematics, it is very similar. But gripper was designed as a passive, thus reduce the load positioning mechanism. Optimization was performed primarily to reduce overall production costs and to reduce weight manipulator. The conclusion is a comparison of current and new solutions. There are also eco-nomic recovery to.

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Meka, Sai Rama Krishna. "Engineering Bioactive Polymer/Ceramic Composite Nanofibrous Scaffolds for Bone Tissue Regeneration". Thesis, 2018. http://etd.iisc.ac.in/handle/2005/4143.

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Tissue repair and regeneration is a natural healing process seen in human body in response to injuries and infections. The regenerative capacity of most tissues decelerates with age and its associated pathological conditions. In particular, bone pathology leads to serious challenges for an individual’s physical activity and survival. Large bone defects in most cases become irreversible. Surgical and therapeutic interventions are commonclinical practises to promote the natural healing process. In particular, substitutes such as auto-grafts and allografts, and permanent implants are the conventional approaches. Common risks associated with aforementioned strategies involve multiple surgeries, immune rejection, graft failure due to non-integration and subsequent side effects. The growing demand for improved and lasting solutions to bone pathologies necessitates engineering of bone-like tissue substitutes. Bone tissue engineering aims to design bone-like three dimensional (3D) scaffolds that closely mimic the native architecture of bone tissues and accelerate bone regeneration and integration with the host tissue. Among many types of scaffolds that are available, nanofibrous scaffolds are particularly promising as they closely mimic the fibrous architecture of the extracellular matrix of native bone tissue. Furthermore, composite nanofibrous scaffolds prepared from blending synthetic biodegradable polymers and ceramic nanoparticles are being widely investigated as an alternative to the use of labile and expensive growth factors. This motivated us to prepare composite nanofibrous scaffolds that offer low cost and effective therapeutic benefits for bone tissue engineering. Chapter 1outlines the detailed literature review on the basic principles involved in preparing nanofibrous scaffolds through electrospinning technique and their importance in bone tissue engineering. Furthermore, recent advances in the technique to generate more complex 3D scaffolds with variety of nanofibrous architecture and material compositions for efficient tissue generation are described. In this chapter, we discuss the progress in improving the equipment design to overcome the limitations associated with electrospinning as a technique to prepare scaffolds that can be used clinically as bone graft substitutes. Chapter 2 focusses on finding the mechanism through which the nanofibrous scaffold architecture induces osteogenic differentiation of hMSCs. The role of cytoskeletal organization of hMSCs grown on two-dimensional flat films (2D Films) and 3D nanofibrous scaffolds (3D NFs) was studied. The 3D NFs were observed to induce osteogenic differentiation and mineralization even in the absence of soluble osteoinductive growth factors when compared to 2D Films. It was observed that both actin filaments and microtubules on 3D NFsregulate cell and nuclear shape,which influences the heterochromatin arrangement thereby inducing the differentiated phenotype through enhanced expression of osteogenic markers and subsequent mineralization. Chapters 3, 4 and 5 focus on the preparation and osteogenic potential of bioactive polymer/ceramic composite nanofibrous scaffolds. Chapter 3 describes the fabrication of strontium carbonate nanoparticle encapsulated PCL scaffolds. The composite scaffolds released significant amount of strontium ions that induced higher proliferation rate, osteogenic differentiation and enhanced mineralization of hMSCs when compared to neat PCL scaffolds. Chapter 4 explains a facile sol-gel method to fabricate silicated nanofibers by electrospinning in situ silica gelated PCL solution. This novel in situ sol-gelation method overcomes the limitation associated with silica particle agglomeration in polymer solution during the mixing process that limits the electrospinning process. Citric and acetic acids were used as acid catalysts in the sol-gelation process, where citric acid was found to promote rapid synthesis of near uniform silica nanoparticles when compared to acetic acid. The presence of citric acid in the silicated scaffolds increased the surface water wettability that triggered significant amount of silicon ion release. The released ions stimulated angiogenic activity of human vascular endothelial cells (HUVECs) and osteogenic differentiation of hMSCs in vitro. Chapter 5 describes the preparation of composite nanofibrous PCL scaffolds encapsulatingin situ synthesised multi-ceramic particlesusing electrospinning. This method allows for rapid and simultaneous synthesis of particles, having silica and calcium composition (calcium oxide or calcium hydrogen phosphate) that mimics the conventional bioactive glass composition, within the polymer solution. The degradation of polymer during fabrication at high pH was prevented by using morpholine as an alternative to pH catalysts. Further, the composite scaffolds released both calcium and silicon ions with or without phosphate ions. These multicomponent composite scaffolds enhanced angiogenic activity of HUVECs as well ashMSC osteogenesis. In conclusion, the presentthesiswork focusses on providing insight into the role of nanofibrous scaffolds in stimulating osteogenic activity and for further improving the osteogenic activity by engineering low cost and yet potent multi-biofunctional nanofibrous scaffolds for bone tissue regeneration.
Department of Science and Technology, Institute GARP fund, Ministry of Human Resource and Development, Government of India

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Książki na temat "Spinneret Designs"

Mohney, Russ. Lurecraft: How to make plugs, spinners, spoons and jigs to catch more fish. East Petersburg, PA: Fox Chapel Publishing, 2013.

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The Spinners Book of Yarn Designs. Storey Publishing, 2012.

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Anderson, Sarah, i Judith MacKenzie. Spinner's Book of Yarn Designs: Techniques for Creating 80 Yarns. Storey Publishing, LLC, 2013.

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99 Yarns And Counting More Designs From The Green Mountain Spinnery. Countryman Press, 2009.

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Brinkmann, Nathalie. A4 Notizbuch Liniert Mit Softcover Design : Halloween Spinnenetz: 120 Linierte DIN A4 Seiten. Independently Published, 2020.

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Meyer, Zera. Yarn Spinning Handbook: A Hand Spinning Guide for Spinners to Learn How to Spin the Wheel or Spindle with Wool Fiber to Create Yarn Designs Plus Tools, and Supplies Included. C.U Publishing LLC, 2022.

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Części książek na temat "Spinneret Designs"

Peng, Na. "Spinneret design". W Hollow Fiber Membranes, 207–23. Elsevier, 2021. http://dx.doi.org/10.1016/b978-0-12-821876-1.00020-2.

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HELSLEY, CHARLES E. "Design of Spinner Magnetometers". W Methods in Palaeomagnetism, 115–18. Elsevier, 2013. http://dx.doi.org/10.1016/b978-1-4832-2894-5.50029-x.

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Yilie Limeneh, Derseh, i Kelem Tiessasie Yilma. "Chapter Review on Computer Simulation of Melt Spinning: A System of Systems Perspective". W Systems of Systems - Engineering, Modeling, Simulation and Analysis [Working Title]. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.93610.

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This chapter discusses an approach for process simulation in the design of melt spinning process for finding optimal design parameters concerning spinneret, quench air unit and other technical parameters for maximum throughput and quality. The property of as-spun fiber is a function of structural parameters at a given condition and orientation of the structural parameter and it is highly governed by stress level at freeze line. Thus, to define structural property and associated relationship, it requires to identify the process to control the variables (or factors) that affect the structural parameter as well as final fiber property. In addition, this chapter also provides a System-of-Systems (SOS) perspective on melt spinning process and its computer modeling along with mathematical equations for estimating spinline stress with a change in process variables. The spinline stress will be used as an input for a computer simulation to have process optimization by changing the necessary variables until it optimized.

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HELSLEY, CHARLES E. "Design of a Transistorized Portable Air-Turbine Spinner Magnetometer". W Methods in Palaeomagnetism, 142–48. Elsevier, 2013. http://dx.doi.org/10.1016/b978-1-4832-2894-5.50033-1.

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Han, Chang Dae. "Flow of Polymeric Liquid in Complex Geometry". W Rheology and Processing of Polymeric Materials: Volume 2: Polymer Processing. Oxford University Press, 2006. http://dx.doi.org/10.1093/oso/9780195187830.003.0006.

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The flow geometry encountered in many polymer processing operations of industrial importance is often far more complex than that in cylindrical or slit dies. As will be shown in the following chapters, the industry manufactures polymeric products using very complex flow geometries. For instance, the fiber industry produces “shaped fibers,” which have cross sections that are noncircular. What is most intriguing in the production of shaped fibers is that a desired fiber shape is often produced by spinneret holes whose cross-sectional shape is quite different from that of the final fiber produced. Hence, an important question may be raised as to how one can determine, from a sound theoretical basis, the cross-sectional shape of spinneret holes that will produce a fiber with a desired cross-sectional shape. In extrusion and injection molding, a polymeric liquid invariably passes through a large cross section before entering into a small cross section, and such a flow is referred to as “entrance flow.” The entrance flow of polymeric liquids, due to their viscoelastic nature, is quite different from that of Newtonian liquids. Similarly, the flow behavior of viscoelastic polymeric liquids near the exit of a die, commonly referred to as “exit flow,” is quite different from that of Newtonian liquids. A better understanding of the unique characteristics of both entrance and exit flows of viscoelastic polymeric fluids is essential for successful design of extrusion dies and molds, as well as to solve difficult technical problems related to a particular processing operation. Before presenting specific polymer processing operations in following chapters, in this chapter we consider the flow of polymeric liquids through complex geometry: (1) fully developed flow through a rectangular channel with uniform channel depth; (2) fully developed flow through a rectangular channel with a moving channel wall; (3) flow through a rectangular channel with varying channel depth; (4) flow in the entrance region of a rectangular die having constant cross section; (5) flow through a tapered die; (6) flow in the exit region of a cylindrical or slit die; (7) flow through a slit die having side holes; and (8) flow through a coat-hanger die.

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Swift, Ellen, Jo Stoner i April Pudsey. "Production and Experience". W A Social Archaeology of Roman and Late Antique Egypt, 228–62. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780198867340.003.0008.

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The chapter assesses the tools used for spinning fibre that survive in the Petrie Museum collection and how these artefacts shaped the daily experiences of their users. It first discusses spinning whorls, with data on the materials, diameters, and weights of these artefacts. The chapter identifies a correlation between different decorative designs and different weights, which would have helped spinners to select the most appropriate tool. There is also discussion of the apotropaic functions of whorl decoration. The chapter goes on to discuss pendants in the shape of weaving combs, which appear to be a distinct artefact type from Roman and late antique Egypt. This leads onto discussion of the cultural and religious function of spinning, through its association with the Virgin Mary and her cult in Egypt. A newly identified finger distaff in the Petrie Museum is presented in terms of its social and functional value, with reference to examples found elsewhere in the empire. Analysis of wear on the object suggests that it was a functional tool, rather than symbolic possession. The chapter also assesses the daily reality of spinning compared to that represented by cultural traditions, the role of women in spinning, and the complicated relationship between professional and domestic labour.

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"Shark Nursery Grounds of the Gulf of Mexico and the East Coast Waters of the United States". W Shark Nursery Grounds of the Gulf of Mexico and the East Coast Waters of the United States, redaktorzy CRAIG W. AUBREY i FRANKLIN F. SNELSON. American Fisheries Society, 2007. http://dx.doi.org/10.47886/9781888569810.ch12.

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<em>Abstract.</em>—A hook-and-line survey designed to sample young spinner sharks <em>Carcharhinus brevipinna </em>in the shallow inshore waters of Cape Canaveral and Cocoa Beach on the east coast of Florida shows that the area served as a nursery for the species in 1997 and 1998. Neonates, born offshore in deeper water in May and June, moved into the study area shortly afterward and stayed throughout the warm summer months, departing in September or October. During this time, they grew from 57.5 to 67.5 cm in fork length (FL) and from 1.2 to 2.6 kg in weight. Young of the year were consistently larger in 1997 than in 1998. The sexes were recruited in equal numbers. Tag return data show that young of the year moved little during their first summer. Juveniles present in the study area for a limited period during the summer averaged 82 cm FL, and most were 1 year old. Their estimated growth was 23–24 cm FL in the first year.

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Streszczenia konferencji na temat "Spinneret Designs"

Agrawal, Gaurav, Ajit Kumar, Rajvardhan Singh, Alekh Gupta, Puneet Kanwar Singh Kundi i Parijat Mukerji. "Innovative Spinner Design Aids in Flow Characterization and Production Optimization of a Multistage Frac Well". W SPE Middle East Oil & Gas Show and Conference. SPE, 2021. http://dx.doi.org/10.2118/204894-ms.

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Abstract An operator working in Indian western land reservoirs, planned to develop a low-permeability, high potential reservoir with hydraulic fracturing. In the pilot project, production behavior of the initial wells was below expectation. As a diagnostic procedure few of the wells were attempted with memory coiled tubing-assisted production logging to record production log data and identify the root cause behind poor performance. Apart from the horizontal trajectory, major challenges associated with this approach included the low flow rate (150-200bbl) and expectation of frac fluid inside the wellbore due to inadequate cleaning. As a result, all the attempts for effective diagnosis were inconclusive. Moreover, absence of critical input such as individual stage frac evaluation demanded attention in order to optimize completion quality (CQ) and conclude effective fracturing and completion strategy prior to full field development planning. Addressing the challenges and with an aim to provide the critical inputs required for reservoir characterization and production optimization, a multi-spinner production logging tool with new innovative spinner design and multi-electrical and optical sensors were proposed on cased-hole tractor in order to resolve the complex flow profiles associated with the low flow rates and horizontal well trajectory. The newly configured spinners with innovative spinner design material lowered the spinner threshold from 2ft/min to 1ft/min for multipass logging in lab tests. It also optimized the magnetic field distribution to ensure less accretion of debris on the spinner (causing spinners to clog) without compromising measurement accuracy. With well production being 200 bbl at the time of logging, the multi-spinner survey with innovative spinner design clearly resolved the dynamic changes across the borehole during multi bean data acquisition. Overcoming the major interpretation challenge of isolating the dynamic changes in the wellbore due to borehole trajectory and due to fracturing stage, individual stage frac flow contributions were evaluated. Stage frac productivity correlated very well with the frac operation parameters, reservoir quality and completion quality. Apart from individual contributions, key findings such as activation of few frac stages at high drawdown pressures, increasing gas contribution from toe to heel and resolving presence of leftover frac fluid in the well, exceeded the expectations set by the client in terms of the objectives vs. results. This success clearly demonstrated that knowledge of downhole dynamics for horizontal trajectory is vital. This is not limited only to address the individual well requirement, but an integrated approach would help to optimize future wells through better understanding of reservoir productivity vs frac operation and completion quality (CQ).

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Jiang, Jiaxin, Xiang Wang, Wenwang Li, Juan Liu, Yifang Liu i Gaofeng Zheng. "Design of Airflow Assisted Spinneret for Electrohydrodynamic Direct-Writing". W 2018 IEEE 13th Annual International Conference on Nano/Micro Engineered and Molecular Systems (NEMS). IEEE, 2018. http://dx.doi.org/10.1109/nems.2018.8556888.

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Tseng, Shi Chang, C. T. Shi, Chia-Lung Kuo i Yu-chiao Cheng. "New pattern on fabrication of fiber spinnerets by LIGA technology". W Design, Test, and Microfabrication of MEMS/MOEMS, redaktorzy Bernard Courtois, Selden B. Crary, Wolfgang Ehrfeld, Hiroyuki Fujita, Jean Michel Karam i Karen W. Markus. SPIE, 1999. http://dx.doi.org/10.1117/12.341241.

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Fatimah, Iim, Diky Anggoro i Lutfi F. Ningsih. "Design of control system of needle spinneret and collector control for nanofiber morphology in electrospinning". W 2ND INTERNATIONAL CONFERENCE ON ADVANCED INFORMATION SCIENTIFIC DEVELOPMENT (ICAISD) 2021: Innovating Scientific Learning for Deep Communication. AIP Publishing, 2023. http://dx.doi.org/10.1063/5.0115237.

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Xu, Weiheng, Dharneedar Ravichandran, Sayli Jambhulkar, Yuxiang Zhu i Kenan Song. "Fabrication of Multilayered Polymer Composite Fibers for Enhanced Functionalities". W ASME 2021 16th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/msec2021-64039.

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Abstract Carbon nanoparticles-based polymer composites have wide applications across different fields for their unique functional properties, durability, and chemical stability. When combining nanoparticle morphologies with micro- or macro-scale morphologies, the hierarchal structure often would greatly enhance the composites’ functionalities. Here in this work, a thermoplastic polyurethane (TPU) and graphene nanoplatelets (GnPs) based multilayered fiber is fabricated through the combination of dry-jet-wet spinning, based on an in-house designed spinneret which accommodates three layers spinning solution, and hot isostatic pressing (HIP), at 220 °C. The multilayered spinneret enables the spinnability of a high GnPs loaded spinning dope, highly elastic, with great mechanical strength, elongation, and flexibility. The HIP process resulted in superior electrical properties as well as a newly emerged fourth hollow layer. Together, such a scalable fabrication method promotes a piezoresistive sensor that is sensitive to uniaxial strain and radial air pressure. The hollow fiber is characterized based on surface morphologies, layer formation, percolation threshold, piezoresistive gauge factor, mechanical stability and reversibility, and air-pressure sensitivity and reversibility. Such facile fabrication methods and unique structures have combined the mechanically robust outer shell with a highly conductive middle sensing layer for a new sensor with great potentials in wearable, robotics, biomedical, and other areas.

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"Optimizing a Plasma Burner by Implementing Additive Manufacturing in the Spinner Design". W International Conference on Advances in Science, Engineering, Technology and Natural Resources. International Academy of Engineers, 2016. http://dx.doi.org/10.15242/iae.iae1116441.

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Ng, Colin, i Amrinder Nain. "Cellular Dynamics on Aligned Fibrous PLGA Scaffolds". W ASME 2011 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2011. http://dx.doi.org/10.1115/sbc2011-54014.

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Understanding cellular dynamics is fundamental to increasing the healing and regenerative capacity of biomedical scaffolds. The ability to investigate environmental cues and cell-cell interactions in vitro with successful translation to in vivo therapies will enhance many tissue engineering technologies. Understanding the dynamics of a cell in response to external mechanical stimuli can help achieve directed cellular migration by varying cellular environment geometries. Customized scaffolds can then be designed to achieve desired cellular migration rates, cell-cell interaction pathways, increased proliferation and directed cellular differentiation platforms to achieve tissue engineering specific goals. In this study, a unique fiber manufacturing platform known as STEP (Spinneret-based Tunable Engineered Parameters) is used to create and manipulate geometrical cues for cellular migration. The cell’s reaction to these geometric cues provides valuable insight into cellular behavior, which can be used to determine the optimal engineered microenvironment. We envision that studying cellular behavior on STEP enabled customized scaffolds will aid in the design and fabrication of accurate mechanistic environments for different cell types which can then be coupled with chemical cues to achieve desired results.

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Kooistra-Manning, Emily A., Lane G. Huston, Jack L. Skinner i Jessica M. Andriolo. "Fiber Creation and Deposition on Arbitrary Surfaces With Gas-Modified Electrospinning". W ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-11456.

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Abstract Electrospinning (ES) is a manufacturing technique used for the fabrication of polymer-based nano to microscale fibers with a high surface-area-to-volume ratio. Traditional ES involves a large floor or tabletop apparatus and must include a collection substrate that is electrically charged relative to the spinneret. Here, we report a miniaturized electrospinner designed for efficiency and portability, which eliminates dependency on an electrically connected deposition surface through addition of gas flow. Using the portable system, polyethylene oxide (200k MW) fiber mats were deposited. During ES, air flow rate, separation distance, and applied voltage were varied, and resultant fiber mats were analyzed and compared for quality and dimension. Finite element analysis was used to predict fiber deposition coverage in conjunction with experimental parameters.

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Jia, Jun, Donggang Yao i Youjiang Wang. "Manufacturing Ultra Fine Filaments by Cold Air Attenuation". W ASME 2010 International Manufacturing Science and Engineering Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/msec2010-34330.

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Ultra fine fibers, with a linear density below 1 denier, are high value products for textile, industrial and biomedical applications. Traditionally ultrafine fibers are produced by extrusion followed by mechanical drawing. In this study a customized fiber extrusion line was designed and set up with the inclusion of a jet nozzle in the spinneret pack. With only cold air attenuation, we were able to obtain drawing ratios exceeding 2500 and produce subdenier continuous filaments. We have conducted parametric studies to investigate the fiber attenuation mechanism and determine the optimal process window for making continuous microfibers. Different characterization methods were carried out to examine the resulting fiber properties, including microstructures, thermal properties, mechanical properties, orientation and crystallinity. Theoretical analysis of cold air drawing is discussed in this paper.

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Shendokar, Sachin, Ajit Kelkar, Ram Mohan i Ron Bolick. "Parametric Investigations on the Effect of Electrospinning Process Variables on the Macroscopic Properties of Hybrid Composites". W ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-12188.

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Electrospinning is regarded as an efficient process to form sub-micron and nano level fibers consistently in a simple laboratory scale setup. The process has excellent potential for scalability and for the structural applications of integrated electrospun fibers in polymer hybrid composites. In our on going work, the mechanical characterization of these hybrid composites with integrated electrospun fibers revealed significant variations based on the sintering temperature and the morphology of the formed electrospun fibers. The morphology (in particular, the fiber diameter) depends on the process parameters of the electrospinning process. This paper investigates the influence of two electrospinning parameters namely: Distance between spinneret and collector plate and voltage. Four voltage levels were selected varying from 15KV to 18 KV in the increments of 1KV. The spinneret to the collector plate distance was varied from 70 mm to 100 mm in 10 mm increments. Thus, a total 16 combinations of these parameters were studied keeping other parameters constant. The objective is to find the optimal voltage and distance combinations that produce smallest electrospun nano fiber diameters consistently. From each voltage-distance combination, the diameter of the deposited fibers was sampled at 50 different points using the morphological image data obtained with a scanning electron microscope (SEM). The analysis of experimental data indicated four favorable voltage-distance combinations that give smallest diameter size of electrospun nano fibers consistently. These four set of parameters were, 15KV and 70 mm; 15KV and 100 mm; 18 KV and 70 mm; and 18KV and 100 mm. The least diameter of fiber was observed and measured for a voltage distance combination of 18KV and 70 mm. The least diameter observed for these parameters can be attributed to the higher applied voltage resulting into higher bending instability causing the reduction in diameter of fibers. Another reason for reduction in fiber diameter is, when the distance between spinneret and collector is increased there is more space for elongation of fibers. With more increase in length of fiber, there is higher reduction in diameter of electrospun fibers. To correlate these process variations of electrospinning to the morphological properties of electrospun fibers, design of experiments study was carried out. It has been attempted here to investigate if there is any correlationship between the morphological property of electrospun fibers and properties of two phase composite. These investigations will provide an insight on the relationship between the process parameters — morphology — and the associated characterized macroscopic properties of the formed composites. Results from the stochastic modeling for variations in the fiber diameter due to the variations in the voltage and the distance correlate well to the ARMA (6,5) stochastic model. Greens functions for the model were derived and showed the stability of the electrospinning process.

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