Thematische Bibliographien / Oscillating head

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Auswahl der wissenschaftlichen Literatur zum Thema „Oscillating head“

Autor: Grafiati

Veröffentlicht am 28. Juni 2021

Zuletzt aktualisiert am 6. Februar 2022

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Zeitschriftenartikel zum Thema "Oscillating head"

He, Zhang-Ming, Deng-Long Wang, Yan-Chao She, Jian-Wen Ding und Xiao-Hong Yan. „Nonperiodic Oscillation of Bright Solitons in Condensates with a Periodically Oscillating Harmonic Potential 10.5560/ZNA.2012-0085“. Zeitschrift für Naturforschung A 67, Nr. 12 (01.12.2012): 723–28. http://dx.doi.org/10.5560/zna.2012-0085.

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Considering a periodically oscillating harmonic potential, we explored the dynamic properties of bright solitons in a Bose-Einstein condensate by using Darboux transformation. It is found that the soliton movement exhibits a nonperiodic oscillation under a slow oscillating potential, while it is hardly affected under a fast oscillating potential. Furthermore, the head-on and/or ‘chase’ collisions of two solitons have been obtained, which could be controlled by the oscillation frequency of the potential.

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Ortega-Jimenez, Victor Manuel, und Robert Dudley. „Aerial shaking performance of wet Anna's hummingbirds“. Journal of The Royal Society Interface 9, Nr. 70 (09.11.2011): 1093–99. http://dx.doi.org/10.1098/rsif.2011.0608.

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External wetting poses problems of immediate heat loss and long-term pathogen growth for vertebrates. Beyond these risks, the locomotor ability of smaller animals, and particularly of fliers, may be impaired by water adhering to the body. Here, we report on the remarkable ability of hummingbirds to perform rapid shakes in order to expel water from their plumage even while in flight. Kinematic performance of aerial versus non-aerial shakes (i.e. those performed while perching) was compared. Oscillation frequencies of the head, body and tail were lower in aerial shakes. Tangential speeds and accelerations of the trunk and tail were roughly similar in aerial and non-aerial shakes, but values for head motions in air were twice as high when compared with shakes while perching. Azimuthal angular amplitudes for both aerial and non-aerial shakes reached values greater than 180° for the head, greater than 45° for the body trunk and slightly greater than 90° for the tail and wings. Using a feather on an oscillating disc to mimic shaking motions, we found that bending increased average speeds by up to 36 per cent and accelerations of the feather tip up to fourfold relative to a hypothetical rigid feather. Feather flexibility may help to enhance shedding of water and reduce body oscillations during shaking.

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Zhang, Kai, Bo Song und Delan Zhu. „The Development of a Calculation Model for the Instantaneous Pressure Head of Oscillating Water Flow in a Pipeline“. Water 11, Nr. 8 (31.07.2019): 1583. http://dx.doi.org/10.3390/w11081583.

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Sinusoidal oscillating water flow at low pressure can improve the anti-clogging ability of an emitter in drip irrigation or the water distribution of a nozzle in sprinkler irrigation and reduce the cost and energy consumption of the irrigation system. In this study, the characteristics of instantaneous pressure head attenuation of oscillating water flow along a pipeline have been investigated. By using a complex function to solve the continuity equation and the momentum equation of a pipeline with water hammer motion and using the Darcy–Weisbach formula to estimate the head loss, a calculation model for the instantaneous pressure head of oscillating water flow along a pipeline was developed. The measured value of the amplitude of the pressure head and the average instantaneous pressure head in the experiments have been used to verify the corresponding pressure head calculated by the model. The results show that the amplitude of the pressure head and the average instantaneous pressure head decrease linearly along the pipeline. The calculated value of the amplitude of the pressure head and the average instantaneous pressure head are basically close to the corresponding measured pressure head. From the results of all the tests, the maximum relative error of the calculated and measured value of the amplitude of the pressure head along the pipeline was 9.44%. The maximum relative error of the calculated and measured value of the average instantaneous pressure head along the pipeline was 8.37%. Hence, the model can accurately predict the instantaneous pressure head of oscillating water flow along a pipe and provide a theoretical basis for the application of oscillating water flow in irrigation systems and the design of irrigation pipe networks.

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Li, Yan-Hom, und Shao-Chun Chen. „Propulsion Mechanism of Flexible Microbead Swimmers in the Low Reynolds Number Regime“. Micromachines 11, Nr. 12 (15.12.2020): 1107. http://dx.doi.org/10.3390/mi11121107.

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A propulsion mechanism for a flexible microswimmer constructed from superparamagnetic microbeads with different diameters and subjected to an oscillating field was studied experimentally and theoretically herein. Various types of artificial swimmers with different bending patterns were fabricated to determine the flexibility and an effective waveform for a planar beating flagellum. Waveform evolutions for various swimmer configurations were studied to determine the flexible mechanism of the swimmers. A one-armed microswimmer can propel itself only if the friction of its wavelike body is anisotropic. A swimmer with a larger head and a stronger magnetic dipole moment with a flexible tail allows the bending wave to propagate from the head toward the tail to generate forward thrust. The oscillating head and tail do not simultaneously generate positive thrust all the time within a period of oscillation. To increase the propulsion for a bending swimmer, this study proposes a novel configuration for a microbead swimmer that ensures better swimming efficiency. The ratio of the oscillation amplitude of the head to the length of the swimmer (from 0.26 to 0.28) produces a faster swimmer. On the other hand, the swimmer is propelled more effectively if the ratio of the oscillation amplitude of the tail to the length of the swimmer is from 0.29 to 0.33. This study determined the optimal configuration for a flexible microbead swimmer that generates the greatest propulsion in a low Reynolds number environment.

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Samokhin, Alexey. „On Monotonic Pattern in Periodic Boundary Solutions of Cylindrical and Spherical Kortweg–De Vries–Burgers Equations“. Symmetry 13, Nr. 2 (29.01.2021): 220. http://dx.doi.org/10.3390/sym13020220.

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We studied, for the Kortweg–de Vries–Burgers equations on cylindrical and spherical waves, the development of a regular profile starting from an equilibrium under a periodic perturbation at the boundary. The regular profile at the vicinity of perturbation looks like a periodical chain of shock fronts with decreasing amplitudes. Further on, shock fronts become decaying smooth quasi-periodic oscillations. After the oscillations cease, the wave develops as a monotonic convex wave, terminated by a head shock of a constant height and equal velocity. This velocity depends on integral characteristics of a boundary condition and on spatial dimensions. In this paper the explicit asymptotic formulas for the monotonic part, the head shock and a median of the oscillating part are found.

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IOALE', PAOLO, und DANTE GUIDARINI. „Methods for Producing Disturbances in Pigeon Homing Behaviour by Oscillating Magnetic Fields“. Journal of Experimental Biology 116, Nr. 1 (01.05.1985): 109–20. http://dx.doi.org/10.1242/jeb.116.1.109.

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Experiments were performed with homing pigeons treated before release with oscillating magnetic fields produced by small Helmholtz coils placed around the neck and on the head of the pigeon or by larger Helmholtz coils surrounding the cage of the birds. In both types of treatment, which both used a single frequency of about 0.14 Hz, the pigeons' initial orientation was strongly affected when the oscillation of the artificial magnetic field was square-shaped, whereas a triangular or sine-shaped variation had no effect.

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Zhang, Kai, Baoxu Zhang und Delan Zhu. „Development and Sensitivity Analysis of an Empirical Equation for Calculating the Amplitude of Pressure Head Loss of Oscillating Water Flow in Different Types of Pipe“. Water 12, Nr. 9 (28.08.2020): 2421. http://dx.doi.org/10.3390/w12092421.

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Low pressure oscillating water flow can reduce the investment and energy consumption of irrigation. It is also effective in reducing the clogging of an emitter and improving the spraying quality of sprinklers. In order to overcome the problem of the complex process in calculating the amplitude of the pressure head loss of oscillating water flow in different types of pipes, in this study, an empirical equation for the amplitude of the pressure head loss of oscillating water flow in different types of pipe has been developed. Further, validation experiments have been conducted to verify the accuracy of the calculated amplitudes of the pressure head loss by the empirical equation. The results show that average relative error between the measured and the calculated amplitudes of the pressure head loss by the empirical equation is 10.77%. Since the relative errors are small, it is an indication that the amplitudes of the pressure head loss calculated by the empirical equation are accurate. For the empirical equation developed in this study, the sensitivity of the model parameters has been analyzed. The results show that the amplitude of velocity, the internal pipe diameter, and the length of pipe are classified as highly sensitive. The average velocity, the period of oscillating water flow, and the modulus of elasticity of the pipe material are classified as sensitive. The thickness of the pipe wall is classified as medium sensitive. Compared with the calculation models of the existing researches, the empirical equation reduces the number of parameters required to be calculated, by which many complicated calculations are avoided, which greatly improves the computing efficiency. This is conducive to the efficient operation and management of oscillating water flow in irrigation pipe networks and also provides help for the optimal design of irrigation pipe networks.

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Yufeng Li, A. K. Menon und M. Sullivan. „An oscillating tester for head/disk interface durability study“. IEEE Transactions on Magnetics 31, Nr. 6 (1995): 3000–3002. http://dx.doi.org/10.1109/20.490250.

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Bulgakov, V., V. Adamchuk, І. Holovach und Ye Ihnatiev. „Mathematical model of the movement of a towed machine for cleaning beet tops residues from root crop heads“. Agricultural Science and Practice 4, Nr. 1 (15.04.2017): 3–10. http://dx.doi.org/10.15407/agrisp4.01.003.

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The work of a tractor-towed machine for cleaning beet top residues from root crop heads, when used with supporting pneumatic wheels, is accompanied with its oscillations in the vertical plane, which has consider- able impact on the quality of implementing the technological process. Therefore, the determination of opti- mal parameters for the cleaning machine, ensuring more stable movement of its cleaning working tool, in the longitudinal-vertical plane fi rst and foremost, is an important task of the mechanization of sugar beet grow- ing industry. Aim. To enhance the effi ciency of cleaning sugar beet top residues from root crop heads via the elaboration of the mathematical model of the oscillating movement of the towed machine for cleaning beet top residues from root crop heads in the longitudinal-vertical plane. Methods. The methods of building computational mathematical models for the functioning of agricultural machines and equipment, based on theoretical mechanics and advanced mathematics, were used. Results. The elaborated equivalent scheme of the movement of the towed cleaning machine was used to obtain the system of two non-linear differential equations for detailed study of the oscillations of the root crop head cleaner in the longitudinal-vertical plane while its supporting pneumatic wheels are moving along uneven soil surface. The mathematical model for the movement of the cleaner with horizontal cleaning roller, elaborated on the basis of initial dynamics equa- tions in the Lagrangian form of the second kind, allowed determining the connection between constructive and kinematic parameters of the vehicle and its oscillating characteristics. The established dependencies formed the prerequisites for further mathematical digital modelling of the parameters of the towed machine for cleaning of root crop heads with a horizontal cleaning roller. Conclusions. The established computation- al model allows optimizing the values of several parameters, characterizing the oscillations of the machine in the longitudinal-vertical plane.

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Ohorodnyk, N., K. Smolianinov und M. Ratsky. „Cellular and humoral immunity of carp at the action of biologically active additives“. Agricultural Science and Practice 4, Nr. 1 (15.04.2017): 70–73. http://dx.doi.org/10.15407/agrisp4.01.070.

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Dissertationen zum Thema "Oscillating head"

Franc, Tadeáš. „Návrh pendlovací hlavy pro plošné navařování Inconelu 625“. Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-443225.

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This diploma thesis deals with the structural design and production of a oscillating head for surface welding of a protective layer of Inconel® 625 superalloy on membrane walls. The design is preceded by a research for possible variants of the solution. Of the two designs, one was successfully manufactured and assembled, and incentives for future improvements were set. For easy optimization and testing of the device, an oscillating motion program was created in the LinMoT Talk 6.9 software. The production costs for the manufactured equipment were then calculated and the recommended selling price was determined, based on a general calculation formula. The result of the project is a functional device, a proposal for its control and a technical - economic evaluation of the production process.

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Hathaway, Aaron A. Ma Hongbin. „Uneven turns oscillating heat pipes“. Diss., Columbia, Mo. : University of Missouri--Columbia, 2009. http://hdl.handle.net/10355/6532.

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The entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file. Title from PDF of title page (University of Missouri--Columbia, viewed on November 17, 2009). Thesis advisor: Dr. Hongbin Ma. Includes bibliographical references.

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Wilson, Corey A. „Experimental investigation of nanofluid oscillating heat pipes“. Diss., Columbia, Mo. : University of Missouri-Columbia, 2006. http://hdl.handle.net/10355/4553.

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Thesis (M.S.) University of Missouri-Columbia, 2006.
The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on August 29, 2007) Includes bibliographical references.

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Cheng, Peng Ma Hongbin. „Theoretial [sic] analysis of oscillating motion, heat transfer, minimum meniscus radius and charging procedure in an oscillating heat pipe“. Diss., Columbia, Mo. : University of Missouri--Columbia, 2008. http://hdl.handle.net/10355/6634.

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Title from PDF of title page (University of Missouri--Columbia, viewed on Feb 25, 2010). The entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file. Dissertation advisor: Dr. Hongbin Ma. Vita. Includes bibliographical references.

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Pachalla, Seshadri Rajagopal. „Analysis of oscillating flow cooled SMA actuator“. Texas A&M University, 2004. http://hdl.handle.net/1969.1/2669.

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Shape Memory Alloys (SMA) are a group of metallic alloys that have the ability to return to some previously defined shape or size when subjected to an appropriate thermal cycling procedure. In recent years there has been a lot of research on the development of small, light and, yet, powerful actuators for use in areas like robotics, prosthetics, biomimetics, shape control and grippers. Many of the miniaturized conventional actuators do not have sufficient power output to be useful and SMAs can be used advantageously here. The widespread use of SMAs in actuators is limited by their low bandwidth. Use of SMAs in two-way actuators requires that they undergo thermal cycling (heating and cooling). While SMAs can be heated quickly by resistive heating, conventional convection cooling mechanisms are much slower as the exothermic austenitic to martensitic phase transformation is accompanied by the release of significant amount of latent heat. While a number of cooling mechanisms have been studied in SMA actuator literature, most of the cooling mechanisms involve unidirectional forced convection. This may not be the most effective method. Oscillating flow in a channel can sometimes enhance heat transfer over a unidirectional flow. One possible explanation for this heat transfer enhancement is that the oscillatory flow creates a very thin Stokes viscous boundary-layer and hence a large time-dependent transverse temperature gradient at the heated wall. Therefore heat transfer takes place at a large temperature difference, thereby enhancing the heat transfer. In this work, the heat transfer from an SMA actuator under an oscillating channel is investigated and is compared to steady, unidirectional flow heat transfer. Oscillating flow is simulated using a finite volume based method. The resulting velocity field is made use of in solving the heat transfer problem using a finite difference scheme. A parametric study is undertaken to identify the optimal flow conditions required to produce the maximum output for a given geometry of the SMA actuator. The latent heat of transformation of the SMA is accounted for by means of a temperature dependent specific heat.

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Liang, Shibin. „Theoretical and experimental investigation of oscillating heat pipes“. Diss., Columbia, Mo. : University of Missouri-Columbia, 2006. http://hdl.handle.net/10355/4560.

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Thesis (M.S.)--University of Missouri-Columbia, 2006.
The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on April 17, 2009) Includes bibliographical references.

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Jeong, Eun S. „Heat transfer with oscillating pressure in reciprocating machinery“. Thesis, Massachusetts Institute of Technology, 1991. http://hdl.handle.net/1721.1/13259.

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Su, Yan. „Numerical simulations on natural convection from a heated oscillating circular cylinder /“. View Abstract or Full-Text, 2003. http://library.ust.hk/cgi/db/thesis.pl?MECH%202003%20SU.

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Thesis (M. Phil.)--Hong Kong University of Science and Technology, 2003.
Includes bibliographical references (leaves 77-80). Also available in electronic version. Access restricted to campus users.

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Amin, Norsarahaida. „Oscillation-induced mean flows and heat transfer“. Thesis, University of East Anglia, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329339.

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Vincent, Christopher John. „Compact oscillating heat pipe and development of fuzzy copper or wicking structures“. Diss., Columbia, Mo. : University of Missouri-Columbia, 2008. http://hdl.handle.net/10355/5695.

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Thesis (M.S.)--University of Missouri-Columbia, 2008.
The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on July 9, 2009) Includes bibliographical references.

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Bücher zum Thema "Oscillating head"

Ma, Hongbin. Oscillating Heat Pipes. New York, NY: Springer New York, 2015. http://dx.doi.org/10.1007/978-1-4939-2504-9.

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Amin, Norsarahaida. Oscillation-induced mean flows and heat transfer. Norwich: University of East Anglia, 1989.

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1950-, Christensen-Dalsgaard Jørgen, und Frandsen Søren 1944-, Hrsg. Advances in helio- and asteroseismology: Proceedings of the 123th [sic] Symposium of the International Astronomical Union, held in Aarhus, Denmark, July 7-11, 1986. Dordrecht: D. Reidel Pub. Co., 1988.

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European Nonlinear Oscillations Conference (1st 1993 Hamburg, Germany). 1st European Nonlinear Oscillations Conference: Proceedings of the international conference held in Hamburg, August 16-20, 1993. Berlin: Akademie Verlag, 1993.

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Torben, Arentoft, Gonzaléz Hernández Irene, Lindsey, Charles (Charles Allan), 1947-, Hill Frank 1952-, Global Oscillations Network Group. GONG 2008 und SOHO Workshop (21st : 2008 : Boulder, Co.), Hrsg. Solar-stellar dynamos as revealed by helio- and asteroseismology: GONG 2008 / SOHO 21 ; Proceedings of a conference held at the High Altitude Observatory, Boulder, Colorado, USA, 11-15 August 2008. San Francisco, Calif: Astronomical Society of the Pacific, 2009.

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Leonard, B. P. ULTRA-SHARP nonoscillatory convection schemes for high-speed steady multidimensional flow. [Washington, D.C.]: NASA, 1990.

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Shibahashi, H., Anthony Eugene Lynas-Gray und Masao Takata. Progress in solar/stellar physics with helio- and asteroseismology: Proceedings of a Fujihara Seminar held at Hakone, Japan, in 13-17 March 2011. San Francisco: Astronomical Society of the Pacific, 2012.

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IUTAM, Symposium on Recent Developments in Non-Linear Oscillations of Mechanical Systems (1999 Hanoi Vietnam). IUTAM Symposium on Recent Developments in Non-Linear Oscillations of Mechanical Systems: Proceedings of the IUTAM symposium held in Hanoi, Vietnam, March 2-5, 1999. Dordrecht: Kluwer Academic Publishers, 2000.

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Leibacher, John, Jain Kiran, Sushanta C. Tripathy, Frank Hill und Alexei A. Pevtsov. Fifty years of seismology of the sun and stars: Proceedings of a workshop held at The Westin La Paloma, Tucson, Arizona, USA, 6-10 May 2013. San Francisco: Astronomical Society of the Pacific, 2013.

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Bowers, Earl Clayton. Investigation of a heat driven thermoacoustic prime mover above onset of self-oscillation. Monterey, Calif: Naval Postgraduate School, 1991.

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Buchteile zum Thema "Oscillating head"

Fujiwara, T., Shinya Tsukamoto und M. Miyagawa. „Analysis of the Grinding Mechanism with Wheel Head Oscillating Type CNC Crankshaft Pin Grinder“. In Advances in Abrasive Technology VIII, 163–70. Stafa: Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-974-1.163.

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Ma, Hongbin. „Introduction“. In Oscillating Heat Pipes, 1–11. New York, NY: Springer New York, 2015. http://dx.doi.org/10.1007/978-1-4939-2504-9_1.

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Ma, Hongbin. „Fundamentals“. In Oscillating Heat Pipes, 13–86. New York, NY: Springer New York, 2015. http://dx.doi.org/10.1007/978-1-4939-2504-9_2.

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Ma, Hongbin. „Oscillating Flow and Heat Transfer of Single Phase in Capillary Tubes“. In Oscillating Heat Pipes, 87–140. New York, NY: Springer New York, 2015. http://dx.doi.org/10.1007/978-1-4939-2504-9_3.

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Ma, Hongbin. „Oscillating Motion and Heat Transfer Mechanisms of Oscillating Heat Pipes“. In Oscillating Heat Pipes, 141–201. New York, NY: Springer New York, 2015. http://dx.doi.org/10.1007/978-1-4939-2504-9_4.

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Ma, Hongbin. „Factors Affecting Oscillating Motion and Heat Transfer in an OHP“. In Oscillating Heat Pipes, 203–34. New York, NY: Springer New York, 2015. http://dx.doi.org/10.1007/978-1-4939-2504-9_5.

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Ma, Hongbin. „Visualization of Oscillating Heat Pipes“. In Oscillating Heat Pipes, 235–88. New York, NY: Springer New York, 2015. http://dx.doi.org/10.1007/978-1-4939-2504-9_6.

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Ma, Hongbin. „Nanofluid Oscillating Heat Pipe“. In Oscillating Heat Pipes, 289–312. New York, NY: Springer New York, 2015. http://dx.doi.org/10.1007/978-1-4939-2504-9_7.

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Ma, Hongbin. „Experiment and Manufacturing Considerations“. In Oscillating Heat Pipes, 313–32. New York, NY: Springer New York, 2015. http://dx.doi.org/10.1007/978-1-4939-2504-9_8.

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Ma, Hongbin. „Conventional Heat Pipes“. In Oscillating Heat Pipes, 333–93. New York, NY: Springer New York, 2015. http://dx.doi.org/10.1007/978-1-4939-2504-9_9.

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Konferenzberichte zum Thema "Oscillating head"

KOSSE, V. „GRINDING HEAD WITH OSCILLATING DIAMOND SEGMENTS“. In Proceedings of the Third International Conference on Abrasive Technology (ABTEC '99). WORLD SCIENTIFIC, 1999. http://dx.doi.org/10.1142/9789812817822_0014.

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Shao, Junpeng, Mingshan Chi, Yanqin Zhang und Bin Xu. „Kinematic simulation of polishing head oscillating mechanism based on COSMOSMotion“. In Mechanical Engineering and Information Technology (EMEIT). IEEE, 2011. http://dx.doi.org/10.1109/emeit.2011.6023233.

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Chaoyi, Fan, Lu Yanyu und Fu Shan. „The head/eye characteristics in tracking superposed sinusoidal oscillating targets“. In 2014 IEEE International Conference on Robotics and Biomimetics (ROBIO). IEEE, 2014. http://dx.doi.org/10.1109/robio.2014.7090501.

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Yadav, Pawan Kumar, Songgang Qiu und Koji Yanaga. „Development of Test Rigs to Investigate Fluid Flow and Heat Transfer in a Stirling Engine Heater Head“. In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-86378.

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To study the fluid flow and heat transfer in a Stirling Engine Heater Head (HH), two benchtop test rigs were designed and manufactured. One is to evaluate flow loss in oscillating flow conditions and another is to evaluate heat transfer in unidirectional flow conditions. The main test section-heater head, is additively manufactured; the test section also consists of an additively manufactured regenerator and a heat rejecter. For fluid flow test rig, a linear actuator from Parker generates and maintains the oscillating flow by driving a piston in sinusoidal motion. The piston is sealed against the charged fluid using Trelleborg seals. At room temperature, by varying the charge pressure, frequency, and stroke length, multiple test conditions can be achieved. For heat transfer test rig, a Gast’s high-flow, low-pressure compressed air blower is used to deliver the flow. The data acquisition (DAQ) is comprised of National Instruments’ cDAQ and modules to measure the piston’s motion in real time, pressure with Kistler’s pressure transducers, and the temperatures with OMEGA’s thermocouples, located at both the inlet and outlet of the heater head. Presented also are the testing procedures, some expected results, and the Sage outputs that will be used to check against the measured data from the test rigs, including some preliminary results. Based on the preliminary results, pressure and position curves were sinusoidal, which is expected of oscillating motions, meaning the test rig is operating well.

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Divaret, Lise, Fanny Depaix, Pierre Moussou, Olivier Cadot, Olivier Doaré und Nicolas de Buretel de Chassey. „Fluid Damping in an Oscillating Array of Cylinders Submitted to Axial Flow“. In ASME 2014 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/pvp2014-28309.

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Axial flows are known to generate a high level of damping with respect to the lateral oscillations of cylinder arrays. The evaluation of these dissipative forces is crucial for seismic design of fuel assemblies. The present study is focused on the case of an array of 40 cylinders oscillating laterally in an axial flow. An experiment is performed in a water tunnel with an rectangular array of 8 × 5 cylinders. The cylinder diameters are D = 10mm, and their length to diameter ratio is L/D = 56. The cylinders are equally spaced with a gap of 3 mm. The distance from the array of cylinders to the wall of the water tunnel is equal to 14mm in the lateral direction and 24.5mm in the direction of the oscillations. The axial flow velocity varies between 0.5m/s and 4.5m/s. The array of cylinders is rigidly clamped to a rod connected to a motoreductor system which enforces a sine-like displacement. The oscillation frequency ranges from 3Hz to 7Hz and the amplitude from 5.4mm to 16mm. An impedance head and an optical micrometer are used to measure the lateral force and the displacement. The added mass and damping coefficients are estimated from the lateral force signal for different axial flow velocities, oscillation amplitudes and frequencies. Results show that the added mass coefficient is almost constant and equal to the potential value proposed by Chen. The damping coefficient depends on only one non dimensional parameter which is the ratio between the oscillation velocity and the axial flow velocity. Two force regimes are also observed: for very low oscillation velocities to axial flow velocity ratios, the damping force is proportional to the oscillation velocity and quadratic otherwise.

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Silva, Elinaldo Santos, und Sergio N. Bordalo. „Experimental Study of Two-Phase Flow in an Oscillating Vertical Pipe“. In ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/omae2018-78323.

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Two-phase vertical flows are of utmost importance for petroleum production, since underground petroleum reservoirs produce oil and gas simultaneously, which must flow together upward to the sea floor through wells, and from these to the production floating units through suspended pipes (risers). Along the pipelines, the mixture of oil and gas may develop several flow patterns — such as bubble, slug, churn and annular flow. These physical configurations present specific characteristics that demand distinct modeling of the head loss as a function of the flow rate. The correct characterization of the flow patterns, under given operational conditions, is fundamental to the modeling of the dynamics of the flow and to the relation between head loss and flow rate. In the literature, most studies on the establishment of the flow patterns have been carried with water and air, and have been restricted to the case of static pipes, while production risers are in constant movement due to the action of waves, sea currents and the displacement of the floating production unit. In the present work, an experimental study of vertical two-phase flow of water and air is conducted with the oscillatory movement of a long and slender flexible vertical pipe of 8,0 m of length and 25,4 mm of diameter. The head loss is measured for different frequencies of oscillation. Comparisons are made between the static and oscillating pipe, with regard to the flow patterns and head losses. The effect of the frequency of oscillation is detected.

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Tanaka, Seiichi, Koji Miyazaki und Seiji Fujiwara. „Pump Head Improvement of Diffuser/Nozzle Valve-Less Micropump“. In ASME 2013 11th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/icnmm2013-73127.

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Micro-pumps are very important for advanced micro fluidic systems such as Lab-on-a-Chips and micro cooling systems, which have been well investigated during the last decades. We developed a valve-less micro-pump with one diffuser/nozzle shaped channel and a variable volume chamber which produces an oscillating flow. One-way flow of the micro-pump was realized in an asymmetric channel by an oscillating flow. Micro-pumps require at least total pump head of 40 kPa to apply micro fluidic devices. In order to achieve above pump head, improvement of original pump is required. In this study, the effect of channel geometry on the pump head of a valve-less micro-pump with a diffuser/nozzle shaped channel was investigated. The micro-pump channels of various angles of 30, 60, 90 degrees between main channel and connecting channel to the chamber with actuator were prepared. The cross section dimensions of the micro-pump channel were 500 microns × 500 microns. The spread angle of the diffuser shape was 50 degrees. The measured pump heads were rearranged using dimensionless numbers as head coefficient to compare for various pump channels. As a result, larger head coefficient was obtained at the angle of 30 degrees which had higher junction loss from the chamber to the inlet channel. The maximum pump head 10.2 kPa was obtained by improved micro-pump, and the value was 1.5 times higher than original pump. The pump head for various drive conditions and channels were estimated using simplified analysis for unsteady operation of the pump based on Bernoulli’s theorem. The calculated pump characteristics agreed with the measured ones.

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Ahmed, Tamer M., Yousri Welaya und Serag M. Abdulmotaleb. „Numerical Modeling of the Hydrodynamic Performance of Hydrofoils for Auxiliary Propulsion of Ships in Regular Head-Waves“. In ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/omae2017-61333.

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In this paper, a detailed hydrodynamic analysis of the thrust generated by an oscillating hydrofoil is presented. The hydrofoil is mounted at the bow of a platform supply vessel as a means of auxiliary propulsion and, is vertically oscillating due to the ship’s heave and pitch motions in head-waves. Firstly, responses of the ship without hydrofoil are obtained using a 3-dimensional frequency-domain panel method. The responses of the ship with hydrofoil are then obtained by taking into account the extra forces and moments due to the presence of the foil. Secondly, three methods are used to calculate the average generated thrust, namely: a quasi-static method, a simplified frequency-domain method and, a dynamic stall method. All three methods are compared and appraised against numerical/experimental data available in the literature, for a similar hull form.

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Whitehead, John, Paulo Waltrich, Richard Hughes und Karsten Thompson. „A Study of Fluid Flow in Sediments and the Effect of Tidal Pumping“. In ASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/omae2016-54959.

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Offshore drilling and production operations can result in spills or leaks of hydrocarbons into seabed sediments, which can potentially contaminate these sediments with oil. If this oil trapped later migrates to the water surface it has the potential for negative environmental impacts. For proper contingency planning and to avoid larger consequences in the environment, it is essential to understand mechanisms and rates for hydrocarbon migration from oil containing sediments to the water surface as well as how much will remain trapped in the sediments. It is believed that the amount of oil transported out of the sediment can be affected by tidal pumping, a common form of Subterranean Ground Water Discharge (SGD). However, we could find no study investigating the phenomenon of fluid flow in subsea sediments saturated with oil and the effects of tidal pumping. This study presents an experimental investigation of tidal pumping to determine if it is a possible mechanism to describe the appearance of an oil on the ocean surface above a sediment bed containing oil. An experimental apparatus was constructed of clear PVC pipe allowing for oil migration to be monitored as it flowed out of a sand pack containing oil, while tidal pressure oscillations were applied in three different manners. The effect of tidal pumping was simulated via compression of air above the water (which simulated the increasing static head from tidal exchange). Experimental results show that sustained oil release occurred from all tests, and tests with oscillating pressure produced for longer periods of time. Furthermore, the experimental results showed that the oil migration rate was affected by grain size, oil saturation, and oscillation wave type. In the static experiments, a linear relationship between grain size and permeability was observed, as is well-known in fluid flow in porous medium. However, the oil recovery does not show a linear relationship with viscosity, as the oil recovery only changed by 50% for a nearly 400% variation in viscosity. In all oscillating experiments the rate and ultimate recovery was less than the comparable static experiments. This leads to the preliminary conclusion that with an oscillating pressure on top of a sand pack, movement of a non-replenishing source of oil is suppressed by pressure oscillation.

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Honami, Shinji, Takaaki Shizawa, Atsushi Sato und Hideki Ogata. „Flow Behavior With an Oscillating Motion of the Impinging Jet in a Dump Diffuser Combustor“. In ASME 1994 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1994. http://dx.doi.org/10.1115/94-gt-233.

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The paper presents the flow behavior with an oscillating motion of an impinging jet upon a flame dome head and its reattachment to the casing wall, when a distorted flow is provided at the inlet of the dump diffuser combustor. Laser Doppler Velocimeter was used for the measurements of the time-averaged flow within a sudden expansion region. Surface pressure fluctuation survey on the flame dome head and flow visualization by a smoke wire technique with a high-speed video camera were conducted from the view point of the unsteady flow feature of the impinging jet. There exists the high vorticity region at the jet boundary resulting in the production of the turbulence kinetic energy. In particular, higher vorticity is observed in the higher velocity side of the jet. The jet near the dome head has the favorable characteristics about the flow rate distribution into the branched channel. Reynolds shear stress and turbulence energy are remarkably produced near the reattachment region. The jet has an oscillating motion near the dome head with asymmetric vortex formation at the jet boundary.

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Berichte der Organisationen zum Thema "Oscillating head"

Lin, C. X. Heat Transfer Enhancement Through Self-Sustained Oscillating Flow in Microchannels. Fort Belvoir, VA: Defense Technical Information Center, Mai 2006. http://dx.doi.org/10.21236/ada460536.

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