Relevant bibliographies by topics / Re-entrant Cavity

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Academic literature on the topic 'Re-entrant Cavity'

Author: Grafiati
Published: 6 September 2023

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Journal articles on the topic "Re-entrant Cavity"

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CALLENAERE, MATHIEU, JEAN-PIERRE FRANC, JEAN-MARIE MICHEL, and MICHEL RIONDET. "The cavitation instability induced by the development of a re-entrant jet." Journal of Fluid Mechanics 444 (September 25, 2001): 223–56. http://dx.doi.org/10.1017/s0022112001005420.

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The instability of a partial cavity induced by the development of a re-entrant jet is investigated on the basis of experiments conducted on a diverging step. Detailed visualizations of the cavity behaviour allowed us to identify the domain of the re-entrant jet instability which leads to classical cloud cavitation. The surrounding regimes are also investigated, in particular the special case of thin cavities which do not oscillate in length but surprisingly exhibit a re-entrant jet of periodical behaviour. The velocity of the re-entrant jet is measured from visualizations, in the case of both cloud cavitation and thin cavities. The limits of the domain of the re-entrant jet instability are corroborated by velocity fluctuation measurements. By varying the divergence and the confinement of the channel, it is shown that the extent of the auto-oscillation domain primarily depends upon the average adverse pressure gradient in the channel. This conclusion is corroborated by the determination of the pressure gradient on the basis of LDV measurements which shows a good correlation between the domain of the cloud cavitation instability and the region of high adverse pressure gradient. A simple phenomenological model of the development of the re-entrant jet in an adverse pressure gradient confirms the strong influence of the pressure gradient on the development of the re-entrant jet and particularly on its thickness. An ultrasonic technique is developed to measure the re-entrant jet thickness, which allowed us to compare it with the cavity thickness. By considering an estimate of the characteristic height of the perturbations developing on the interface of the cavity and of the re-entrant jet, it is shown that cloud cavitation requires negligible interaction between both interfaces, i.e. a thick enough cavity. In the case of thin cavities, this interaction becomes predominant; the cavity interface breaks at many points, giving birth to small-scale vapour structures unlike the large-scale clouds which are periodically shed in the case of cloud cavitation. The low-frequency content of the cloud cavitation instability is investigated using spectral analysis of wall pressure signals. It is shown that the characteristic frequency of cloud cavitation corresponds to a Strouhal number of about 0.2 whatever the operating conditions and the cavity length may be, provided the Strouhal number is computed on the basis of the maximum cavity length. For long enough cavities, another peak is observed in the spectra, at lower frequency, which is interpreted as a surge-type instability. The present investigations give insight into the instabilities that a partial cavity may undergo, and particularly the re-entrant jet instability. Two parameters are shown to be of most importance in the analysis of the re-entrant jet instability: the adverse pressure gradient and the cavity thickness compared to the re-entrant jet thickness. The present results allowed us to conduct a qualitative phenomenological analysis of the stability of partial cavities on cavitating hydrofoils. It is conjectured that cloud cavitation should occur for short enough cavities, of the order of half the chordlength, whereas the instability often observed at the limit between partial cavitation and super-cavitation is here interpreted as a cavitation surge-type instability.
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LABERTEAUX, K. R., and S. L. CECCIO. "Partial cavity flows. Part 1. Cavities forming on models without spanwise variation." Journal of Fluid Mechanics 431 (March 25, 2001): 1–41. http://dx.doi.org/10.1017/s0022112000002925.

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Partial cavities that formed on the vertices of wedges and on the leading edge of stationary hydrofoils were examined experimentally. The geometry of these test objects did not vary in the spanwise direction (i.e. two-dimensional). Open partial cavities formed on a series of two-dimensional wedges and on a plano-convex hydrofoil. These cavities terminated near the point of maximum cavity thickness, and small vapour-filled vortices were shed in the turbulent cavity wake. The turbulent flow in the wake of the open cavity was similar to the turbulent shear flow downstream of a rearward-facing step. Re-entrant flow was not observed in the cavity closure of open cavities, although recirculating flow associated with a region of flow separation was detected for some cases. Predictions of a two-dimensional free-streamline model of the cavitating wedge flows were compared to the experimentally observed cavities. The model predicted the profile of the open cavity only to the point of maximum cavity thickness. Examination of the flow field near the closure of the open cavities revealed adverse pressure gradients near the cavity closure. The pressure gradients around the open cavities were sufficient to cause large-scale condensation of the cavity. Unsteady re-entrant partial cavities formed on a two-dimensional NACA0009 hydrofoil. The interface of the unsteady closed cavities smoothly curved to form a re-entrant jet at the cavity terminus, and the re-entrant flow was directed upstream. The re-entrant flow impinged on the cavity interface and led to the periodic production of cloud cavitation. These cavities exhibited a laminar flow reattachment. The flow around the closed cavity was largely irrotational, while vorticity was created when the cloud cavitation collapsed downstream of the cavity. Examination of the flow field near closure of these cavities also revealed adverse pressure gradients near the partial cavity closure, but the rise in pressure did not lead to the premature condensation of the cavity.
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Tiwari, Ashish Kumar, Ramesh Kumar, and P. R. Hannurkar. "Resonant frequency of re-entrant klystron cavity." International Journal of Electronics Letters 4, no. 4 (June 15, 2015): 404–10. http://dx.doi.org/10.1080/21681724.2015.1055593.

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Pelz, P. F., T. Keil, and T. F. Groß. "The transition from sheet to cloud cavitation." Journal of Fluid Mechanics 817 (March 22, 2017): 439–54. http://dx.doi.org/10.1017/jfm.2017.75.

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Recent studies indicate that the transition from sheet to cloud cavitation depends on both cavitation number and Reynolds number. In the present paper this transition is investigated analytically and a physical model is introduced. In order to include the entire process, the model consists of two parts, a model for the growth of the sheet cavity and a viscous film flow model for the so-called re-entrant jet. The models allow the calculation of the length of the sheet cavity for given nucleation rates and initial nuclei radii and the spreading history of the viscous film. By definition, the transition occurs when the re-entrant jet reaches the point of origin of the sheet cavity, implying that the cavity length and the penetration length of the re-entrant jet are equal. Following this criterion, a stability map is derived showing that the transition depends on a critical Reynolds number which is a function of cavitation number and relative surface roughness. A good agreement was found between the model-based calculations and the experimental measurements. In conclusion, the presented research shows the evidence of nucleation and bubble collapse for the growth of the sheet cavity and underlines the role of wall friction for the evolution of the re-entrant jet.
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Deliceoğlu, Ali, Ebutalib Çelik, and Fuat Gürcan. "Singular treatment of viscous flow near the corner by using matched eigenfunctions." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 233, no. 5 (May 15, 2018): 1660–76. http://dx.doi.org/10.1177/0954406218772603.

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In this paper, the local singular behavior of Stokes flow is solved near the salient and re-entrant corners by the matching eigenfunction method. The flow in a rectangular and an L-shaped cavity are considered as a model for the flow generated by the motion of the upper lid. The solutions of the Stokes equation in polar coordinates are matched with a velocity vector components obtained by analytic or numerical solution for the streamfunction developed for any values of the heights of the rectangular and an L-shaped cavity. Streamline patterns near the corner are simulated for a different aspect ratio A. The techniques are tested on a flow problem undergoing Stokes or Navier–Stokes equations in a square cavity. It is seen that the method appears to be cheaper and more accurate than the numerical and analytical methods. It is expected that the study will lead to useful insights into the understanding of the flow topology near a re-entrant corner from a combined analytical-numerical method. Attention is then focused on the topological behavior near the re-entrant corner of the L-shaped cavity. Careful analysis of the streamlines of streamfunction near the re-entrant corner by using wall shear stress allows us to give a possible flow bifurcation of dividing streamline.
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Dang, J., and G. Kuiper. "Re-Entrant Jet Modeling of Partial Cavity Flow on Three-Dimensional Hydrofoils." Journal of Fluids Engineering 121, no. 4 (December 1, 1999): 781–87. http://dx.doi.org/10.1115/1.2823537.

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A potential-based lower-order surface panel method is developed to calculate the flow around a three-dimensional hydrofoil with an attached sheet cavity the leading edge. A Dirichlet type dynamic boundary condition on the cavity surface and a Neumann boundary condition on the wetted surface are enforced. The cavity shape is initially assumed and the kinematic boundary condition on the cavity surface is satisfied by iterating the cavity length and shape. Upon convergence, both the dynamic boundary condition and the kinematic boundary condition on the cavity surface are satisfied, and a re-entrant jet develops at the cavity closure. The flow at the closure of the cavity and the mechanism of the re-entrant jet formation is investigated. Good agreement is found between the calculated results and MIT’s experiments on a 3-D hydrofoil.
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Kalhori, Shirzad, Nils Elander, Jan Svennebrink, and Sharon Stone-Elander. "A Re-Entrant Cavity for Microwave-Enhanced Chemistry." Journal of Microwave Power and Electromagnetic Energy 38, no. 2 (January 2003): 125–35. http://dx.doi.org/10.1080/08327823.2003.11688493.

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Pandit, Himanshu, Donglu Shi, N. Hari Babu, X. Chaud, D. A. Cardwell, P. He, D. Isfort, Robert Tournier, David Mast, and Altan M. Ferendeci. "High Tc superconductor re-entrant cavity filter structures." Physica C: Superconductivity 425, no. 1-2 (September 2005): 44–51. http://dx.doi.org/10.1016/j.physc.2005.05.010.

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Sangster, A. J., E. McErlean, G. Beale, M. Kelly, and P. Smith. "Coupled Re-Entrant Cavity System for Electromagnetic Levitation." Journal of Electromagnetic Waves and Applications 15, no. 6 (January 2001): 815–31. http://dx.doi.org/10.1163/156939301x01048.

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Zang, Jianbo, Hu Zhang, Jiean Shen, and Yaoyao Wang. "Analysis of cavity shedding around the twisted hydrofoil." Thermal Science, no. 00 (2022): 180. http://dx.doi.org/10.2298/tsci220606180z.

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In order to understand the mechanism of cavity shedding and evolution, turbulent cavitating flows of the twisted hydrofoil were numerically investigated using the k-? turbulence model and the ZGB cavitation model. The results of the numerical calculation and the experimental method are basically consistent, which confirms the feasibility of the numerical calculation model. This study has obtained the following conclusions. Firstly, the cavity shedding can be summarized into six stages, and the cavity shape, pressure and velocity field at different stages are displayed, analyzed and compared in detail. Secondly, the shedding of cavity and its evolution are mainly caused by the re-entrant jet and side-entrant jet, in which the former provides the kinetic energy and the latter plays the role of guiding the direction. Thirdly, under the convective shearing action of the re-entrant jet and the main flow, a strong vortex located in the mid-back edge of the hydrofoil is formed, which promotes the transformation of the cavity shape into a U-shaped structure.
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Dissertations / Theses on the topic "Re-entrant Cavity"

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PANDIT, HIMANSHU RAMESH. "HIGH Tc SUPERCONDUCTOR RE-ENTRANT CAVITY FILTER STRUCTURES." University of Cincinnati / OhioLINK, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1060369109.

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Layden, Robert Greathouse. "A numerical analysis of the radar cross section of an arbitrary shaped over-moded re-entrant cavity." Thesis, Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/13749.

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Tsankova, Gergana [Verfasser], Roland [Gutachter] Span, Markus [Gutachter] Richter, and Eric F. [Gutachter] May. "Thermodynamic property measurements using a microwave re-entrant cavity resonator / Gergana Tsankova ; Gutachter: Roland Span, Markus Richter, Eric F. May." Bochum : Ruhr-Universität Bochum, 2017. http://d-nb.info/1142001784/34.

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Sinha, Piyush. "Design and Analysis of a Re-Entrant Microwave Cavity and Its Application for a High-Performance Accelerometer." Thesis, 2021. https://etd.iisc.ac.in/handle/2005/5659.

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Accelerometers with high resolution are required for tracking and navigation in launch vehicles, spacecrafts, missiles and other strategic applications. Pendulous integrating gyroscopic accelerometer and force balanced accelerometers cover the need for high accuracy guidance and navigation system. However, they require high precision fabrication, high piece part count and hence have low reliability. Moreover, these sensors are very expensive. The flexure mass accelerometer utilises a microwave resonator to provide inertial grade output. It also requires a complex fabrication process for the development and assembly of the proof mass. Moreover, its sensing electronics is complex and requires a large number of components. In this thesis, a microwave resonator is investigated, which offers a solution to the requirement of a high precision accelerometer for an inertial navigation system with low complexity, simple fabrication and high reliability. A differential re-entrant cavity sensor has been integrated with low noise cavity stabilized oscillator-based sensing electronics to achieve a high resolution and scale factor accelerometer. The cavities for the proposed accelerometer can be easily fabricated with conventional machining techniques. An improved approach is proposed in the present work to calculate the resonance frequency, its sensitivity, and quality factor of re-entrant cavities, having diverse taper shapes of the re-entrant post. The proposed closed-form expressions for resonance frequency are based on the chain matrix approach for tapered coaxial transmission lines. Analytical expression for various cases are used to evaluate the quality factor of these cavities. The calculated results for the resonance frequency, its sensitivity and quality factor have been verified with electromagnetic simulations and experiments, and the error in the proposed closed-form expression is found to be < 4%. It is demonstrated that the cavity with a post having a taper towards the re-entrant gap-end is more sensitive to gap variations as compared to straight post and previously reported inverted tapered post cavity. A displacement sensor and mechanically tunable resonator, based on a tapered post re-entrant cavity, is fabricated in this present work. The deflection of a thin diaphragm was evaluated numerically from the measured resonance frequencies and the proposed expressions derived in this work. This design of the sensor is found to be immune to manufacturing tolerance in the re-entrant gap. This thesis further discusses the design, fabrication and measurement results of an inertial grade microwave straight post re-entrant cavity-based accelerometer. A straight post cavity is chosen so as to reduce the piece part count and hence improve reliability of the sensor A scale factor model for the re-entrant cavity-based sensor is developed. It is then used for a parametric study of cavity’s resonance frequency, sensitivity and Q-factor. The design parameters of the sensor are optimized to achieve 5 times better scale factor as compared to previously reported work. The radio frequency (RF) readout for this high sensitivity accelerometer is designed using a low noise cavity-stabilized oscillator (CSO), which is frequency locked to the cavity. The CSO has an inherently low close-in phase noise and is simple in implementation. This method of locking the oscillator to the cavity does not require an active carrier suppression technique or an isolator, as reported in previous work. A mathematical model of phase noise of the CSO is developed to design this for an accelerometer resolution of 1 µg. The proposed accelerometer is evaluated after integrating the differential re-entrant cavity-based sensors with its CSO based sensing electronics. The measured phase noise of CSO is 47dB better, at 100 Hz offset, than the free running voltage controlled oscillator (VCO) used. The fabricated accelerometer achieved a scale factor of 2.5 MHz/g and a bias stability of 1ng with a measurement range of ±1 g. The achieved accelerometer performance is without any external control on the operating temperature and environmental condition. This is one of the best bias stability and scale factors reported to date in a similar genre of accelerometer fabricated using conventional machining. The proposed design can be used for low-cost, compact inertial grade accelerometers. This research focused on a high-performance applications of reentrant cavities. Results from this research indicate similar cavities and sensing circuits can be designed for diverse applications.
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Books on the topic "Re-entrant Cavity"

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Belshaw, John Calvert. Design and construction of a cryogenic re-entrant cavity filter. Bradford, 1987.

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Book chapters on the topic "Re-entrant Cavity"

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"FIG. 15 Three possible gas reservoirs: On the left (a), a crevice (extended perpen-dicular to the plane of the page) or conical pit. On the right (b), a small-mouthed re-entrant cavity. In each case, the opening radius is a. FIG. 16 A thin sheet of liquid advancing from right to left encounters a crevice. If θ<2β, then the crevice." In Surface and Interfacial Tension, 534. CRC Press, 2004. http://dx.doi.org/10.1201/9780203021262-157.

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Conference papers on the topic "Re-entrant Cavity"

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Marques-Villarroya, David, Felipe Penaranda-Foix, Beatriz Garcia-Banos, Jose Manuel Catala-Civera, and Jose Daniel Gutierrez-Cano. "Analysis of an overmoded re-entrant cavity." In 2017 47th European Microwave Conference (EuMC). IEEE, 2017. http://dx.doi.org/10.23919/eumc.2017.8230884.

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Kelly, M. B. "Design of cylindrical re-entrant cavity resonators." In IEE Colloquium on Effective Microwave CAD. IEE, 1997. http://dx.doi.org/10.1049/ic:19971270.

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Hemawan, K. W., T. A. Grotjohn, and J. Asmussen. "Plasma-Assisted Combustion in a Coaxial Re-Entrant Microwave Cavity." In 2007 IEEE Pulsed Power Plasma Science Conference. IEEE, 2007. http://dx.doi.org/10.1109/ppps.2007.4345623.

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Ikeda, A., H. Konishi, and M. Sakai. "A New Design Method of Re-Entrant Cavity Bandpass Filters." In 13th European Microwave Conference, 1983. IEEE, 2006. http://dx.doi.org/10.1109/euma.1983.333187.

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Castellani, I. "Cavity length and re-entrant jet in 2-D sheet cavitation." In ADVANCES IN FLUID MECHANICS 2006. Southampton, UK: WIT Press, 2006. http://dx.doi.org/10.2495/afm06034.

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Penaranda-Foix, Felipe L., Jose M. Catala-Civera, Antoni J. Canos-Marin, and Beatriz Garcia-Banos. "Circuital analysis of a coaxial re-entrant cavity for performing dielectric measurement." In 2009 IEEE MTT-S International Microwave Symposium Digest (MTT). IEEE, 2009. http://dx.doi.org/10.1109/mwsym.2009.5165945.

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Mohammed, Ali Musa, Yi Wang, and Milan Salek. "Dielectric Measurement of Substrate Materials Using 3D Printed Re-Entrant Cavity Resonator." In 2021 51st European Microwave Conference (EuMC). IEEE, 2022. http://dx.doi.org/10.23919/eumc50147.2022.9784354.

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Rao, Xing, Kadek Hemawan, Campbell Carter, Timothy Grotjohn, Jes Asmussen, and Tonghun Lee. "Plasma Enhanced Combustion using Microwave Energy Coupling in a Re-entrant Cavity Applicator." In 48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2010. http://dx.doi.org/10.2514/6.2010-651.

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Murugkar, Anita, Rajiv Panigrahi, and K. J. Vinoy. "A novel approach for high Q microwave re-entrant cavity resonator at S-band." In 2016 Asia-Pacific Microwave Conference (APMC). IEEE, 2016. http://dx.doi.org/10.1109/apmc.2016.7931410.

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Nakano, A., K. Kato, K. Tsuchiya, K. Nakazawa, T. Yabuhara, T. Uzuka, and H. Takahashi. "Experimental heating properties of re-entrant type resonant cavity applicator for deep tumor hyperthermia." In Conference Proceedings. Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE, 2006. http://dx.doi.org/10.1109/iembs.2006.260764.

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