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Relevant bibliographies by topics / Swirl tube

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Academic literature on the topic 'Swirl tube'

Author: Grafiati

Published: 4 June 2021

Last updated: 16 February 2022

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Journal articles on the topic "Swirl tube"

1

Huang, Wei Jun, and Qin Zhang. "Swirl-Based Non-Contact Method of Cell Orientation Control." Key Engineering Materials 609-610 (April 2014): 660–65. http://dx.doi.org/10.4028/www.scientific.net/kem.609-610.660.

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Orientation adjustment is an important issue in the micromanipulation of cells. A non-contact method based on a swirl for cell orientation control was introduced in this paper. The swirl is produced by a pair of opposite micro-fluids squirting from two parallel tubes. Cell orientation adjustment is realized by cells rotation due to swirl viscous drag, which drives cells to desired configurations. The appropriate distances between the end face of the two tubes and the distance between the axes of them are 1-3 times tube diameter for the cells rotating in the swirl central zone. Especially when the distances are kept double the cell diameter, cells rotate steadily round the swirl central point. By pulsating jetting, fluctuant micro-fluid are generated which make cell rotating a certain angle. Adjusting the pulse duration, pressure and jetting velocity, the cell rotation angle can be controlled which make orientation control more precisely. The method is valid for cells of different shapes and sizes. The effectiveness of the proposed non-contact method for cell configuration control was verified by experiments.

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Brundrett, E. "Prediction of Airflow With Swirl in Perforated Polyethylene Tubes." Journal of Fluids Engineering 112, no. 4 (December 1, 1990): 447–54. http://dx.doi.org/10.1115/1.2909424.

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The influence upon flow of fan induced inlet swirl is examined for two commonly used sizes of uniformly perforated polyethylene ventilation tubes (polytubes). Swirl is present at the inlet of most polytubes that are directly connected to a supply fan whether or not an antiswirl device is used. Four experimentally obtained inlet swirl angles are examined using swirl modified pressure recovery coefficients, pipe friction factors, and orifice discharge equations. A computational procedure divides the polytube into five equal length segments to obtain a rapid yet acceptably accurate procedure. An iterative microcomputer spreadsheet solves the resulting set of simultaneous equations, providing pressure and flow discharge profiles along the tube that are in very good agreement with the experimental data and with the data of others. An extension of the analysis for uniformly spaced orifices indicates that supply swirl angles greater than 25 deg and large length to diameter ratios should be avoided.

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Sparrow, E. M., N. T. Littlejohn, J. M. Gorman, and J. P. Abraham. "Mass Transfer and Particle Separation by Swirl-Chamber and Swirl-Tube Devices." Numerical Heat Transfer, Part A: Applications 64, no. 8 (October 15, 2013): 611–20. http://dx.doi.org/10.1080/10407782.2013.790276.

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Shi, Hongbo, and Petr Nikrityuk. "The Influence of Inflow Swirl on Cavitating and Mixing Processes in a Venturi Tube." Fluids 5, no. 4 (September 30, 2020): 170. http://dx.doi.org/10.3390/fluids5040170.

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A study of the mixing flows (Schmidt number = 103) in a cavitating Venturi tube that feature linear and swirling flows is presented in this paper. The Large Eddy Simulation (LES) turbulence model, the Schnerr–Sauer cavitation model, and the mixture multiphase model, as implemented in the commercial CFD ANSYS FLUENT 16.2, were employed. The main emphasis is spending on the influence of different inlet swirling ratios on the generation of cavitation and mixing behaviors in a Venturi tube. Four different inflow regimes were investigated for the Reynolds number Re = 19,044, 19,250, 19,622, 21,276: zero swirl, 15% swirl, 25% swirl and 50% swirl velocity relative to the transverse inflow velocity, respectively. The computed velocity and pressure profiles were shown in good agreement with the experiment data from the literature. The predicted results indicate that the imposed swirl flow moves the cavitation bubbles away from throat surfaces toward the throat axis. The rapid mixing between two volumetric components is promoted in the divergent section when the intense swirl is introduced. Additionally, the increase in the swirl ratio from 0.15 to 0.5 leads to a linear increase in the static pressure drop and a nonlinear increase in the vapor production. The reduction in the fluid viscosity ratio from μ2μ1=10 to μ2μ1=1 generates a high cavitation intensity in the throat of the Venturi tube. However, the changes in the pressure drop and vapor volume fraction are significantly small of pure water flow.

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Peng, Weiming, Alex C. Hoffmann, and Huub Dries. "Separation characteristics of swirl-tube dust separators." AIChE Journal 50, no. 1 (January 2004): 87–96. http://dx.doi.org/10.1002/aic.10008.

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Ismail, Nurhasanah, Wirachman Wisnoe, and Muhammad Fairuz Remeli. "Experimental Investigation of Orifice Diameter, Swirl Generator and Conical Valve Shape to the Cooling Performance of Ranque-Hilsch Vortex Tube." Applied Mechanics and Materials 510 (February 2014): 174–78. http://dx.doi.org/10.4028/www.scientific.net/amm.510.174.

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This paper is about experimental investigation of the orifice diameter, swirl generator and conical valve shape influence the cooling performance of Ranque-Hilsch vortex tube. From the experiment, its shows that conical valve shape has smallest effect on cooling performance (0.124) of the Ranque-Hilsch vortex tube. It also revealed that swirl generator gave the greatest (0.336) effects to the cooling performance of Ranque-Hilsch vortex tube and have the highest range of difference cooling performance (0.027 to 0.229) compare to conical valve shape (0.073 to 0.087) and orifice diameter (0.009 to 0.012).

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Gao, Guang Cai, Jian Jun Wang, and You Hai Jin. "Numerical Study of the Gas Flow in the Swirl Tube." Advanced Materials Research 550-553 (July 2012): 3194–200. http://dx.doi.org/10.4028/www.scientific.net/amr.550-553.3194.

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The gas flow field in the swirl tube was studied by experimental measurement and numerical simulation. The results show that the simulation results based on the Reynolds stress turbulent model is in good agreement with the measured results probed by the five orifice Pitot-tube. Meantime, it is analyzed that there is short cut stream at the end of the exit tube, and at the dust discharge jaws, the particles are prone to be re-entrained from the hopper. All results above provide a base for further research on the optimization of the structure and the improvement of the separation performance of the swirl tube.

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Kim, Seung-Jun, Yong Cho, and Jin-Hyuk Kim. "Effect of Air Injection on the Internal Flow Characteristics in the Draft Tube of a Francis Turbine Model." Processes 9, no. 7 (July 7, 2021): 1182. http://dx.doi.org/10.3390/pr9071182.

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Under low flow-rate conditions, a Francis turbine exhibits precession of a vortex rope with pressure fluctuations in the draft tube. These undesirable flow phenomena can lead to deterioration of the turbine performance as manifested by torque and power output fluctuations. In order to suppress the rope with precession and a swirl component in the tube, the use of anti-swirl fins was investigated in a previous study. However, vortex rope generation still occurred near the cone of the tube. In this study, unsteady-state Reynolds-averaged Navier–Stokes analyses were conducted with a scale-adaptive simulation shear stress transport turbulence model. This model was used to observe the effects of the injection in the draft tube on the unsteady internal flow and pressure phenomena considering both active and passive suppression methods. The air injection affected the generation and suppression of the vortex rope and swirl component depending on the flow rate of the air. In addition, an injection level of 0.5%Q led to a reduction in the maximum unsteady pressure characteristics.

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Wei, Hang Xin, and Hong Wang. "Structure Design of Swirl Flow Tool in the Natural Gas Well." Applied Mechanics and Materials 741 (March 2015): 563–66. http://dx.doi.org/10.4028/www.scientific.net/amm.741.563.

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In order to solve the problem of gas recovery by liquid drainage, the swirl flow tool was designed. Firstly, the whole structure of the swirl flow tool was introduced. The swirl flow tool includes three units, i.e. the screw basement, restrictor and setting mechanism. The characteristic of the tool is that there does not exist a gap between the outer diameter of the swirl flow tool and the inner diameter of the oil tube. Then, its work principle, setting process and deblocking process were discussed. The application results for the swirl flow tool in the oilfield show that the casing pressure is decreased by 7.0%-17.6% and the average gas production per day is increased by 7.4%-11.9%.

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Ewart Brundrett and Peter T. Vermes. "Evaluation of Tube Diameter and Fan Induced Swirl in Polyethylene Ventilation Tubes." Transactions of the ASAE 30, no. 4 (1987): 1131–36. http://dx.doi.org/10.13031/2013.30532.

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Dissertations / Theses on the topic "Swirl tube"

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Novotny, Pavel [Verfasser]. "Stability of Swirl Tube Flow / Pavel Novotny." München : Verlag Dr. Hut, 2019. http://d-nb.info/1200755308/34.

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Novotny, Pavel [Verfasser], and Bernhard [Akademischer Betreuer] Weigand. "Stability of swirl tube flow / Pavel Novotny ; Betreuer: Bernhard Weigand." Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2019. http://d-nb.info/1201646375/34.

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Shukla, Shashank. "An investigation of effects of flow conditioning on straight tube Coriolis meter." Thesis, [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-2807.

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Ramalingam, Ammaiyappan Arul Kumaran. "Design and Development of a High Swirl Burner with Gaseous Fuel Injection through Porous Tubes." University of Cincinnati / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1511795499271833.

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Kilian, Ondřej. "Vestavby v savce vírové turbiny." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229741.

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Diploma thesis deals with design and exploration of installation in the draft tube of the swirl turbine. Use of the draft tube is defined in the first part, with illustration of energetical gain and efficiency of draft tube. Further the suitable shape of draft tube is studied by CFD computing. Design, research and evaluation of installation in the draft tube are solved in the main part.

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Martins, Jason Alves. "Separador solido-liquido para operação em fundo de poços de petroleo." [s.n.], 2006. http://repositorio.unicamp.br/jspui/handle/REPOSIP/264088.

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Orientador: Eugenio Spano Rosa
Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica
Made available in DSpace on 2018-08-07T21:12:52Z (GMT). No. of bitstreams: 1 Martins_JasonAlves_M.pdf: 1693632 bytes, checksum: 9c8933692155bfbbb91d774a1f849391 (MD5) Previous issue date: 2006
Resumo: O presente trabalho investiga os mecanismos de separação sólido-líquido em separadores tubo-ciclônicos. O trabalho é desenvolvido a partir de testes experimentais e simulação numérica. A etapa experimental investiga a influência do aumento de viscosidade sobre a eficiência do separador. Através de uma análise dimensional, os dados experimentais são reduzidos em grupos adimensionais. Obtem-se uma correlação entre a eficiência de separação e os grupos adimensionais. Ela revela como a eficiência depende dos parâmetros geométricos e operacionais do separador. A correlação obtida possibilita dimensionar estes separadores para cenários com elevada viscosidade. As simulações numéricas são realizadas utilizando um método de volumes finitos. O processo de separação é estudado através do adimensional Stokes. São introduzidos os conceitos de superfície de captura e tempo de residência de partículas. Define -se um importante parâmetro do escoamento, o comprimento de decaimento. Propõe-se um modelo unidimensional para o separador. Realiza-se com base neste modelo uma análise comparativa entre dois separadores. Os resultados são coerentes com dados experimentais e indicam quais características geométricas melhoram a eficiência do separador
Abstract: This work investigates the solid-liquid separation mechanisms in swirl tubes through experimental and numerical analysis. In the experimental phase, it is analyzed the impact of the viscosity increase on the separation efficiency of swirl tubes. The experimental data are reduced using dimensional analysis. A functional relationship between the separation efficiency and the dimensionless groups is obtained, allowing to calculate the separation efficiency dependency on the liquid viscosity, flow rate, particle size, and other geometrical parameters of the separator. This relationship helps to design these desander devices to scenarios with high viscosity. Numerical simulations are carried out in a structured grid using a finite volume method. Separation process is studied through the Stokes number. The concepts of capture surface and residence time of particles are introduced and an important flow field parameter, the length of decay is defined. A one-dimensional model is proposed for the swirl tube. A comparative analysis between two separators is done based on the one-dimensional model. The results are in agreement with experimental data and indicate which geometrical features help to improve the separator efficiency
Mestrado
Termica e Fluidos
Mestre em Engenharia Mecânica

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Vosáhlo, David. "Návrh vírových turbin pro MVE Vrchlabí." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230792.

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The aim of this master’s thesis is the optimal design of swirl turbines for small water power plant. It is described a different possibilities of turbine‘s install for locality Vrchlabí. It presents a design of turbines and draft tubes. For the installation of turbines is computed theoretical production of annual electric energy. Furthermore it describes a design of supply channel and intake structure.

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Šuráň, David. "Vliv nastavitelných vestaveb v savce turbiny na charakteristiku a tlakové pulzace." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-444634.

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This master’s thesis deals with the draft tube and its optimization for various operating conditions. The research investigates the theoretical description and function of the draft tube and explains known methods of suppressing pressure pulsation so far. In the computational part, the author proposes a new method and designs optimal geometry of adjustable installations (ribs) for the draft tube. Finally, the comparison with the default geometry without ribs is performed.

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Šebela, Radek. "Návrh vírové turbiny pro konkrétní lokalitu ČEZ,a.s." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231293.

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This thesis deals with the design of water turbine enabling optimal utilization of hydro-energetic potential of given location (barrage on Úpa river) chosen by ČEZ a.s. company. Moreover, the option of multi-unit layout is discussed. Because of the low-head profile of given location, the technology of swirl turbine in siphon configuration was chosen. Technology of swirl turbine presents new modification of Kaplan turbine with no need of guide vane. Swirl turbine is characterized by its high discharge and high speed. The main part of this thesis is focused on hydraulic design of the turbine.

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Hazucha, Jan. "Vliv otevření difuzoru na dynamické vlastnosti spirální vírové struktury." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-401535.

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This master’s thesis deals with CFD simulation of spiral vortex structure in the diffuser of swirl generator. The objective of the thesis is to evaluate influence of change in diffuser opening angle on frequency and amplitude of pressure pulsation. All results are compared in charts which shows courses of frequencies and amplitudes along the diffuser. Two different turbulence models and several types of mesh were tested

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Books on the topic "Swirl tube"

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Hoffmann, Alex C., and Louis E. Stein. Gas Cyclones and Swirl Tubes. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-662-07377-3.

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E, Stein Louis, ed. Gas cyclones and swirl tubes: Principles, design and operation. Berlin: Springer, 2002.

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Hoffmann, Alex C. Gas cyclones and swirl tubes: Principles, design, and operation. 2nd ed. Berlin: Springer, 2008.

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Louis E. Stein,Alex Hoffmann. Gas Cyclones and Swirl Tubes. Springer, 2008.

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Gas Cyclones and Swirl Tubes. Springer, 2010.

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Gas Cyclones and Swirl Tubes. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-74696-6.

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Hoffmann, Alex C., and Louis E. Stein. Gas Cyclones and Swirl Tubes. Springer, 2002.

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Hoffmann, Alex C., and Louis E. Stein. Gas Cyclones and Swirl Tubes: Principles, Design, and Operation. Springer, 2014.

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Hoffmann, Alex C. Gas cyclones and swirl tubes : principles, design and operation. Berlin : Springer, 2002, 2002.

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Book chapters on the topic "Swirl tube"

1

Hoffmann, Alex C., and Louis E. Stein. "Introduction." In Gas Cyclones and Swirl Tubes, 1–14. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-662-07377-3_1.

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Hoffmann, Alex C., and Louis E. Stein. "Measurement Techniques." In Gas Cyclones and Swirl Tubes, 175–92. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-662-07377-3_10.

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Hoffmann, Alex C., and Louis E. Stein. "Underflow Configurations and Considerations." In Gas Cyclones and Swirl Tubes, 193–213. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-662-07377-3_11.

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Hoffmann, Alex C., and Louis E. Stein. "Some Special Topics." In Gas Cyclones and Swirl Tubes, 215–38. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-662-07377-3_12.

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Hoffmann, Alex C., and Louis E. Stein. "Demisting Cyclones." In Gas Cyclones and Swirl Tubes, 239–62. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-662-07377-3_13.

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Hoffmann, Alex C., and Louis E. Stein. "Foam-Breaking Cyclones." In Gas Cyclones and Swirl Tubes, 263–75. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-662-07377-3_14.

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Hoffmann, Alex C., and Louis E. Stein. "Design Aspects." In Gas Cyclones and Swirl Tubes, 277–97. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-662-07377-3_15.

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Hoffmann, Alex C., and Louis E. Stein. "Multicyclone Arrangements." In Gas Cyclones and Swirl Tubes, 299–312. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-662-07377-3_16.

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Hoffmann, Alex C., and Louis E. Stein. "Basic Ideas." In Gas Cyclones and Swirl Tubes, 15–35. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-662-07377-3_2.

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Hoffmann, Alex C., and Louis E. Stein. "How Cyclones Work." In Gas Cyclones and Swirl Tubes, 37–48. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-662-07377-3_3.

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Conference papers on the topic "Swirl tube"

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Anderson, Morris. "Shielded Swirl Versus Piccolo Tube Inlet Thermal Anti-Icing System." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-90992.

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Abstract This study presents a CFD comparison of a piccolo tube inlet anti-icing system with benchmark flight test data and a shielded swirl design. Aircraft engine inlets must prevent ice accretion that could cause damage or inhibit safe operation. A common way to meet this requirement is to heat the inlet with hot air distributed with a piccolo tube or a swirl anti-icing system. Piccolo tube systems generally use less engine bleed air but are more complex and heavier than swirl systems. The CFD model for this study includes all the inlet key characteristics such as piccolo tube holes, material properties, and thickness. The model is evaluated in a two-step process. Water collection rates for flight in icing conditions are calculated. These results are then mapped onto a conjugate heat transfer film runback model. The CFD results include surface temperatures and the amount of liquid film runback that flows off the heated surface. Benchmark test data is presented illustrating good inlet surface temperature agreement with the piccolo tube CFD model for flight in both dry air and icing conditions. This CFD modeling approach is also applied to a unique shielded swirl anti-icing system. The results of this study confirm that a shielded swirl anti-icing system can be designed to provide the same level of anti-icing protection that is achieved with a piccolo tube configuration without overheating the inlet or requiring more engine bleed flow.

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Bouhairie, Salem. "Analysis of Swirl Flow by Tube Inserts for CFD Study." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-52820.

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The petroleum and petrochemical industries continually seek mechanical methods to improve heat transfer in shell-and-tube heat exchangers. Tube bundle inserts are popular mechanical devices that help improve performance. The increase in the tubeside heat transfer coefficient by the insert allows for a decrease in required shellside flow length, assuming single tube pass. The flow length reduction allows for designing higher velocities and subsequent shellside shear rates, to help reduce crude oil fouling potential. This work presents some of HTRI’s ongoing experimental measurements and preliminary Computational Fluid Dynamics (CFD) simulations. CFD visualization of swirl flow dynamics and heat transfer inside the augmented tube provides insight on complex flow physics, which is misunderstood. Heat Transfer Research, Inc. (HTRI) collected experimental data for in-tube single-phase flow using twisted tape inserts in the Tubeside Single-Phase Unit (TSPU) situated in the Research and Technology Center (RTC). Our data will be used to calibrate ANSYS FLUENT CFD simulations of a tube with a twisted tape swirl insert. We first performed plain tube simulations and compared the heat transfer results with open literature measurements, for validation. We will modify the CFD tube model to have a swirl flow insert, and compare numerical results against open literature experimental data of diabatic single-phase swirl flow. In future, we will compute heat transfer (heating and cooling) and pressure drop for tube insert configurations at laminar and turbulent Reynolds numbers from 3000 to 500000. The range of tubeside Reynolds numbers required the use of the laminar, transition, and Realizable k-epsilon turbulence models with scalable wall functions. This study describes some of the mechanisms behind turbulent swirl flow augmentation inside a tube, as well as the limitations of conventional in-tube heat transfer correlations applied to swirl flow inserts.

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Anderson, Kyle, Ben Reinhardt, Walead Sultani, Hannah O' Hern, Xiang Zhang, and Bahman Abbasi. "A New Approach to Evaluate and Optimize Swirl Tube Demister Efficiency." In ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-23623.

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Abstract The focus of this report is on a new technique to quantify the air-water separation efficiency of a swirl tube demister that has application in numerous water purification systems. This experimental study adds to the existing literature by quantifying the effect of design parameters on both the previously studied water collection efficiency, as well as the air bypass efficiency, defined as the ratio of the air mass flowrate exiting at the desired air outlet, over the inlet air mass flowrate. This parameter is important for the water purification field because air acts as a carrier of contaminants, necessitating that it does not leak into the purified water collection chamber. Results from this study showed there was a clear trend when comparing the air bypass efficiency to the inlet air to water ratio. As the inlet air to water ratio increased, the air bypass efficiency decreased. This trend was consistent among four different experimental apparatuses indicating that either the geometry of the swirl tube had very little effect of the air bypass efficiency, or that the ranges tested for dimensions thought to affect the swirl tube performance were not varied enough.

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Chen, Changkun, Christophe Nicolet, Koichi Yonezawa, Mohamed Farhat, Francois Avellan, and Yoshinobu Tsujimoto. "One-Dimensional Analysis of Full Load Draft Tube Surge." In ASME/JSME 2007 5th Joint Fluids Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/fedsm2007-37304.

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One-dimensional stability analysis of a hydraulic system composed of a penstock, a runner and a draft tube was carried out to determine the cause of the full load draft tube surge. It is assumed that the cavity volume at the runner exit is a function of the pressure at the vortex core evaluated from the instantaneous local pressure at the runner exit and an additional pressure decrease due to the centrifugal force on the swirling flow. It was found that the diffuser effect of the draft tube has a destabilizing effect over all flow rates while the swirl effects stabilize/destabilize the system at larger/smaller flow rates than the swirl free flow rate. Explanations of the destabilizing mechanism are given for the diffuser and swirl flow effects.

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Chang, Tae-Hyun, Sang-Cheol Kil, Deog Hee Doh, and Sang youn Kim. "Experiments on Swirling Flow in a Vertical Circular Tube." In ASME-JSME-KSME 2011 Joint Fluids Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajk2011-31010.

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Swirling flows are related to spiral motion in the tangential direction in addition to the axial and radial direction using several swirl generators. These kinds of flows are used for combustion chambers to improve the flame stability, heat exchanger enhancing heat transfer coefficients, agricultural spraying machines and some vertical pipes to move slurries or conveying of materials. But, few papers have dealt with three dimensional velocities profiles in a vertical pipe. In this paper, 3 dimension PIV technique has employed to measure velocities profiles in water along a vertical circular pipe for Re = 3000 ∼ 13,000. The swirl generator to be used is tangential inlet condition to produce the flow. The velocities and flow noise have been measured with swirl in the water and air along the test tube.

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Eiamsa-ard, Smith, Panida Seemawute, and Khwanchit Wongcharee. "Heat Transfer Enhancement in a Tube Fitted With Twisted Tape Swirl Generator." In 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-22500.

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Flow friction, heat transfer and thermal performance characteristics in a tube fitted with peripherally-cut twisted tape (PT) have been experimentally investigated. The twist ratio (y/W) of twisted tape was varied from 3 to 5 while the depth of peripheral cut ratio (d/W) and the width of peripheral cut ratio (w/W) were both kept constant at 0.22. The experiments were conducted for the Reynolds number ranging from 5100 to 19,700, using water as a working fluid. The plain tube and the tube equipped with the typical twisted tape (TT) with three different twist ratios (y/W = 3, 4 and 5) were also tested for comparison. The obtained results reveal that the use of PT enhances Nusselt number up to 211% and 138% compared to those of the plain tube and the tube with TT, respectively. It is also found that heat transfer rate increases with decreasing twist ratio. Additionally, the performance evaluation to assess the real benefits in using the PT as heat transfer enhancer has also been determined.

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Khalatov, Artem A., Igor I. Borisov, Sergey D. Severin, Vyacheslav V. Romanov, Vladimir Y. Spitsyn, and Yuriy Y. Dashevskyy. "Heat Transfer, Hydrodynamics and Pressure Drop in the Model of a Blade Leading Edge Cyclone Cooling." In ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/gt2011-45150.

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The heat transfer, hydrodynamics and pressure drop have been studied experimentally at the air swirling flow in the round tube with 90° exit bend, simulating the blade cyclone cooling. The flow was supplied into the test section from the closed circular plenum through one or two tangential slots (swirl generators) made on the round tube surface. The flow angle to the first swirl generator was 60° (β = 0° is the “classic” tangential inlet). The following three configurations, reflecting the actual blade design, were studied, namely: (i) the tube with one swirl generator and open exit, (ii) the tube with one swirl generator and 90° exit bend, (iii) the tube with two swirl generators and 90° exit bend. The Reynolds number, based on the average axial velocity and tube internal diameter was ranged from 40000 to 105000. The surface streamline swirl flow angle, static and total pressure excess, heat transfer and pressure losses in the round tube, swirl generator area and exit bend were measured. In terms of the heat transfer rate the best results has demonstrated the configuration with one swirl generator and 90° exit bend.

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Koyama, Masamichi, Hiroshi Fujiwara, Laurent Zimmer, and Shigeru Tachibana. "Effects of Swirl Combination and Mixing Tube Geometry on Combustion Instabilities in a Premixed Combustor." In ASME Turbo Expo 2006: Power for Land, Sea, and Air. ASMEDC, 2006. http://dx.doi.org/10.1115/gt2006-90891.

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In this paper, flow fields inside a premixed combustor have been investigated by CFD analysis and PIV measurement in a preheating, non-reacting condition. Four types of premixer are examined. The design of the premixer is determined by the combination of swirlers and mixing tubes. There are two variations of triple-concentric swirlers and three variations of mixing tubes. Comparisons are made among mean velocity distributions derived from CFD and PIV. PDF analysis is performed on the data from PIV to discuss the possibility of the occurrence of flashback. Combustion rig tests have been carried out also on similar condition to see combustion instabilities depending on the choice of premixers and operating conditions. Flame is directly observed from crystal windows placed on the side and downstream of the combustion chamber. A glass rod is installed on the wall of the mixing tube so as to see light emissions inside the tube, i.e. evidence of flashback. Pressure fluctuations at the combustor liner are measured in one position. The spectra of pressure fluctuations are computed to look at the possibility of combustion oscillations. Discussions are made on the relation between the global flame structure and pressure modes. Finally, proper premixer configurations to prevent combustion instabilities are proposed.

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Sofuoglu, Mehmet Alper, Murat Erbas, Ibrahim Uslan, and Atilla Biyikoglu. "Development of a Swirl Nozzle for Powder Technology." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-66777.

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In this study, a gas atomization nozzle for metal powder production has been designed and modeled numerically. The design has been performed in two stages. At the first stage of the design, the size and geometry of the nozzle have been developed to obtain circulated flow through the nozzle as a pre-design. At the second stage, a parametrical analysis has been done using a CFD code. The geometry of the nozzle has been changed and the effect of geometric parameters was determined to find out the more efficient nozzle design parameters. Gas behavior at the nozzle exit and effect of the gas on the melt delivery tube tip has been investigated. Appropriate values for the investigated parameters have been determined to get maximum pressure in vacuum condition at the tip of the melt. The pressure observed at the melt delivery tube was compared with the experimental melt tip pressure data. These results suggest that the CFD solutions can be used in the design of the nozzle. Thus, the lower cost and shorter time would be possible to develop highly efficient nozzle geometry.

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Yadav, R. J., Sandeep Kore, and V. N. Riabhole. "Analytical Prediction of Heat Transfer in Tape Generated Swirl Flow." In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-71243.

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Heat transfer and pressure drop characteristics in a circular tube with twisted tapes have been investigated experimentally and numerically using different working fluids by many researchers for wide range of Reynolds number. The swirl was generated by tape inserts of various twist ratios. The various twist ratios are considered Many researchers formed generalized correlations to predict friction factors and convective heat transfer coefficients with twisted tapes in a tube for a wide range of Reynolds numbers and Prandtl numbers. Satisfactory agreement was obtained between the present correlations and the data of others validate the proposed correlations. The experimental or numerical predictions were compared with earlier correlations revealing good agreement between them. From the literature review it is observed that most studies are mainly focused on the heat transfer enhancement using twisted tape by experimental or numerical solution. An investigation with analytical approach is rarely reported. Therefore, the main aim of the present work is to form a correlation from theoretical approach for Nusselt number for circular tube with twisted tape. Application of dimensional analysis to heat transfer in tape generated swirl flow is carried out.

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