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Academic literature on the topic 'Reentrant cavities'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Reentrant cavities"

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Huang, Binghuan, Haiwang Li, and Tiantong Xu. "Experimental Investigation of the Flow and Heat Transfer Characteristics in Microchannel Heat Exchangers with Reentrant Cavities." Micromachines 11, no. 4 (April 12, 2020): 403. http://dx.doi.org/10.3390/mi11040403.

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The application of microchannel heat exchangers is of great significance in industrial fields due to their advantages of miniaturized scale, large surface-area-to-volume ratio, and high heat transfer rate. In this study, microchannel heat exchangers with and without fan-shaped reentrant cavities were designed and manufactured, and experiments were conducted to investigate the flow and heat-transfer characteristics. The impact rising from the radius of reentrant cavities, as well as the Reynolds number on the heat transfer and the pressure drop, is also analyzed. The results indicate that, compared with straight microchannels, microchannels with reentrant cavities could enhance the heat transfer and, more importantly, reduce the pressure drop at the same time. For the ranges of parameters studied, increasing the radius of reentrant cavities could augment the effect of pressure-drop reduction, while the corresponding variation of heat transfer is complicated. It is considered that adding reentrant cavities in microchannel heat exchangers is an ideal approach to improve performance.
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Barroso, J. J., P. J. Castro, O. D. Aguiar, and L. A. Carneiro. "Reentrant cavities as electromechanical transducers." Review of Scientific Instruments 75, no. 4 (April 2004): 1000–1005. http://dx.doi.org/10.1063/1.1688438.

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Pan, Minqiang, Hongqing Wang, Yujian Zhong, Tianyu Fang, and Xineng Zhong. "Numerical simulation of the fluid flow and heat transfer characteristics of microchannel heat exchangers with different reentrant cavities." International Journal of Numerical Methods for Heat & Fluid Flow 29, no. 11 (November 4, 2019): 4334–48. http://dx.doi.org/10.1108/hff-03-2019-0252.

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Purpose With the increasing heat dissipation of electronic devices, the cooling demand of electronic products is increasing gradually. A water-cooled microchannel heat exchanger is an effective cooling technology for electronic equipment. The structure of a microchannel has great impact on the heat transfer performance of a microchannel heat exchanger. The purpose of this paper is to analyze and compare the fluid flow and heat transfer characteristic of a microchannel heat exchanger with different reentrant cavities. Design/methodology/approach The three-dimensional steady, laminar developing flow and conjugate heat transfer governing equations of a plate microchannel heat exchanger are solved using the finite volume method. Findings At the flow rate range studied in this paper, the microchannel heat exchangers with reentrant cavities present better heat transfer performance and smaller pressure drop. A microchannel heat exchanger with trapezoidal-shaped cavities has best heat transfer performance, and a microchannel heat exchanger with fan-shaped cavities has the smallest pressure drop. Research limitations/implications The fluid is incompressible and the inlet temperature is constant. Practical implications It is an effective way to enhance heat transfer and reduce pressure drop by adding cavities in microchannels and the data will be helpful as guidelines in the selection of reentrant cavities. Originality/value This paper provides the pressure drop and heat transfer performance analysis of microchannel heat exchangers with various reentrant cavities, which can provide reference for heat transfer augmentation of an existing microchannel heat exchanger in a thermal design.
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Meidlinger, M., T. L. Grimm, and W. Hartung. "Design of half-reentrant SRF cavities." Physica C: Superconductivity 441, no. 1-2 (July 2006): 155–58. http://dx.doi.org/10.1016/j.physc.2006.03.055.

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Seo, Dongjin, Alex M. Schrader, Szu-Ying Chen, Yair Kaufman, Thomas R. Cristiani, Steven H. Page, Peter H. Koenig, Yonas Gizaw, Dong Woog Lee, and Jacob N. Israelachvili. "Rates of cavity filling by liquids." Proceedings of the National Academy of Sciences 115, no. 32 (July 19, 2018): 8070–75. http://dx.doi.org/10.1073/pnas.1804437115.

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Understanding the fundamental wetting behavior of liquids on surfaces with pores or cavities provides insights into the wetting phenomena associated with rough or patterned surfaces, such as skin and fabrics, as well as the development of everyday products such as ointments and paints, and industrial applications such as enhanced oil recovery and pitting during chemical mechanical polishing. We have studied, both experimentally and theoretically, the dynamics of the transitions from the unfilled/partially filled (Cassie–Baxter) wetting state to the fully filled (Wenzel) wetting state on intrinsically hydrophilic surfaces (intrinsic water contact angle <90°, where the Wenzel state is always the thermodynamically favorable state, while a temporary metastable Cassie–Baxter state can also exist) to determine the variables that control the rates of such transitions. We prepared silicon wafers with cylindrical cavities of different geometries and immersed them in bulk water. With bright-field and confocal fluorescence microscopy, we observed the details of, and the rates associated with, water penetration into the cavities from the bulk. We find that unconnected, reentrant cavities (i.e., cavities that open up below the surface) have the slowest cavity-filling rates, while connected or non-reentrant cavities undergo very rapid transitions. Using these unconnected, reentrant cavities, we identified the variables that affect cavity-filling rates: (i) the intrinsic contact angle, (ii) the concentration of dissolved air in the bulk water phase (i.e., aeration), (iii) the liquid volatility that determines the rate of capillary condensation inside the cavities, and (iv) the presence of surfactants.
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Bansiwal, Ashok, Sushil Raina, K. J. Vinoy, and Subrata Kumar Datta. "Effect of Beam tunnels on Resonant Frequency of Cylindrical Reentrant Cavity." Defence Science Journal 71, no. 03 (May 17, 2021): 332–36. http://dx.doi.org/10.14429/dsj.71.16814.

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Analytical formulations for the resonant frequency of a reentrant cavity for klystron are available in the literature only for such cavities having a single beam-tunnel. An improved analytical formulation has been proposed in this paper for the calculation of cavity gap-capacitance of reentrant cavities having single and multiple beam-tunnels and its effects on the resonant frequency are studied. The results obtained through analysis have been validated against those obtained from the 3D electromagnetic field simulations and measurements. The proposed analytical formulation provides good estimation of resonant frequency of cavity with single and multiple beam-tunnels.
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Barroso, Joaquim J., Pedro J. Castro, Joaquim P. Leite Neto, and Odylio D. Aguiar. "Analysis and Simulation of Reentrant Cylindrical Cavities." International Journal of Infrared and Millimeter Waves 26, no. 8 (July 25, 2005): 1071–83. http://dx.doi.org/10.1007/s10762-005-7268-3.

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McAllister, Ben T., Yifan Shen, Graeme Flower, Stephen R. Parker, and Michael E. Tobar. "Higher order reentrant post modes in cylindrical cavities." Journal of Applied Physics 122, no. 14 (October 14, 2017): 144501. http://dx.doi.org/10.1063/1.4991751.

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Kuppusamy, Navin Raja, N. N. N. Ghazali, Saidur Rahman, M. A. Omar Awang, and Hussein A. Mohammed. "Heat Transfer Enhancement in a Microchannel Heat Sink with Trapezoidal Cavities on the Side Walls." Applied Mechanics and Materials 819 (January 2016): 127–31. http://dx.doi.org/10.4028/www.scientific.net/amm.819.127.

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The present study focuses on the numerical study of thermal and flow characteristics in a microchannel heat sink with alternating trapezoidal cavities in sidewall (MTCS). The effects of flow rate and heat flux on friction factor and Nusselt are presented. The results showed considerable improvement heat transfer performance micro channel heat sink with alternating trapezoidal cavities in sidewall with an acceptable pressure drop. The heat transfer rate has improved in the cavity area due the greater fluid mixing in fluid vortices and thermal boundary layer disruption. The slipping over the reentrant cavities and pressure gain reduces pressure drop appears as the reason behind of only minor pressure drop due to the cavities.
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Koşar, Ali, Chih-Jung Kuo, and Yoav Peles. "Boiling heat transfer in rectangular microchannels with reentrant cavities." International Journal of Heat and Mass Transfer 48, no. 23-24 (November 2005): 4867–86. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2005.06.003.

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Dissertations / Theses on the topic "Reentrant cavities"

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Courtois, Jérémie. "Développements de systèmes multipassages pour application à la spectroscopie d'absorption : Cavity Ring Down Spectroscopy multimode et cellules à passages multiples." Phd thesis, Université Paris Sud - Paris XI, 2009. http://tel.archives-ouvertes.fr/tel-00458101.

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La spectroscopie d'absorption par mesure du temps de vie des photons piégés dans une cavité optique haute-finesse, ou Cavity Ring Down Spectroscopy (CRDS), compte parmi les outils de diagnostic optique les plus sensibles. L'excitation « mode matchée » d'un laser continu rapidement et continûment balayé (~4 THz.s-1 durant ~2 ms), i.e. la cw-CRDS monomode rapide, garantit à la technique ses meilleures performances en termes de limites de détectivité avec, en contrepartie, des points de mesures séparés de l'Intervalle Spectral Libre du résonateur (ISL=c/2L) : le dosage d'environnements basse pression requiert de longues cavités. Cette étude originale propose de mettre à profit la structure transverse du résonateur afin de rendre possible la miniaturisation du dispositif de cw-CRDS rapide. L'excitation multimode d'une cavité fractionnellement dégénérée (dite de taille « magique »), ici présentée, permet de bénéficier d'un gain d'échantillonnage spectral qui vaut l'ordre réentrant N employé. Nous développons deux schémas d'injection multimode : l'injection multimode axiale et l'injection multimode réentrante, dite dans ce dernier cas hors de l'axe optique, de telles cavités et nous en étudions les principales différences. Une étude détaillée du champ intracavité existant aux N résonances constitutives de l'ISL est proposée afin de rendre compte des limites de détectivités associées à ces deux schémas d'injection multimode sensiblement distincts. Une seconde partie de ce travail de thèse est dédiée à caractériser de façon approfondie l'observation des profils spatiaux intracavités formés en injection hors axe lorsque la cavité souffre d'un faible astigmatisme (ΔR/R~2 %) : on parle de profil de Lissajous. Cette étude rend compte des mécanismes fondamentaux, telle la coïncidence particulière de modes particuliers par dispersion modale, qui aboutissent en un intervalle millimétrique de dégénérescence. Celui-ci est le siège d'une succession de profils transverses de Lissajous symétriques les uns des autres de part et d'autre d'une taille particulière de cavité : nous en précisons les causes. Le résiduel astigmatisme ainsi mis en évidence et mesuré permet, en outre, d'expliquer la disparition des oscillations Doppler normalement présentent en début de décroissance ring down dans ce type d'injection dynamique. De façon connexe, nous développons plusieurs types de cellules multipassages non-résonantes comme alternative à la CRDS pour le dosage d'environnements hostiles.
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Conference papers on the topic "Reentrant cavities"

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Barroso, Joaquim J., and Joaquim P. Leite Neto. "Electrodynamic properties of reentrant klystron cavities." In 2007 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference. IEEE, 2007. http://dx.doi.org/10.1109/imoc.2007.4404266.

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Kuo, Chih-Jung, and Yoav Peles. "Suppression of Flow Boiling Instabilities in Microchannels Using Artificial Reentrant Cavities." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-43021.

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Flow boiling instability in parallel microchannel and the ability of artificial reentrant cavities to suppress their occurrence was experimental studied. Experiments were conducted using two types of 226 μm hydraulic diameter parallel microchannel devices: microchannel with reentrant cavities and plain-wall microchannel. Onset of nucleate boiling (ONB), critical heat flux (CHF) condition, onset of flow oscillation (OFO), and local temperature were also obtained and compared. It was found that reentrant cavities on channel walls can assist mitigating the rapid bubble growth instability and postpone the parallel channel and compressible volume instability, which resulted in the delay of CHF.
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Barroso, Joaquim J., and Joaquim P. Leite Neto. "Reentrant Klystron Cavities with Circular and Conical Inserts." In 2007 IEEE International Vacuum Electronics Conference. IEEE, 2007. http://dx.doi.org/10.1109/ivelec.2007.4283246.

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Kuo, Chih-Jung, and Yoav Peles. "Local Heat Transfer Coefficient of Flow Boiling in Microchannels With Artificial Reentrant Cavities." In ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference collocated with the ASME 2007 InterPACK Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ht2007-32159.

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Flow boiling in parallel microchannels with structured reentrant cavities was experimental studied. Flow patterns, boiling inceptions and heat transfer coefficients were obtained and studied for G = 83 kg/m2-s to G = 303 kg/m2-s and heat fluxes up to 643 W/cm2. The heat transfer coefficient-mass velocity and quality relations had been analyzed to identify boiling mechanism. Comparisons of the performance of the enhanced and plain-wall microchannels had also been made. The microchannels with reentrant cavities were shown to promote nucleation of bubbles and to support significantly better reproducibility and uniformity of bubble generation.
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Popielarski, J. T., T. L. Grimm, W. Hartung, and R. C. York. "Design of half-reentrant SRF cavities for heavy ion linacs." In 2007 IEEE Particle Accelerator Conference (PAC). IEEE, 2007. http://dx.doi.org/10.1109/pac.2007.4441239.

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Kumar, M. Santosh, Chaitali Koley, A. K. Bandyopadhyay, Debashish Pal, and Santigopal Maity. "Design and simulation of Radial Reentrant Cavities For Ka band Vacuum Microwave Devices." In TENCON 2019 - 2019 IEEE Region 10 Conference (TENCON). IEEE, 2019. http://dx.doi.org/10.1109/tencon.2019.8929502.

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Zhou, Siyi, and Bahgat G. Sammakia. "Modeling of Two-Phase Micro-Channel Flow for Thermal Management of Electronic Systems." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-37219.

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Traditional thermal solutions are reaching their practical limits on heat removal requirement for processers with high circuit power density over the coming years. The implementation of forced convective boiling in microchannels is a promising alternative, as attainable heat transfer rate is very favorable. In this study, the instabilities of two-phase boiling flow in a single microchannel are computationally explored by utilizing commercial software. Based on previous studies, numerical results get really qualitative agreement. For the steady state, the bubble growth, from isolated bubbles to elongated bubbly flow near the outlet region, can be exactly observed in the current simulation. As for transient analysis, boiling regimes are investigated in terms of two specified mass velocities. The time-dependent fluctuations in wall temperature are given to indicate the transition of different flow patterns and the effect of varied mass flux. In addition, boiling mechanisms are found to be strongly dependant on wall surface conditions. A comparison of the computed flow boiling in a microchannel with reentrant cavities on side walls to experimental results is performed. The cavities are shown to help to facilitate boiling nucleation, enhance the critical heat flux, and reduce the superheat for the boiling onset. Finally, the size effect of nucleation sites is analyzed and addressed, the cavity diameter and depth being carefully considered. Based on the compatible view, the optimal configuration of reentrant cavities is located.
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RIBEIRO, K. L., O. D. AGUIAR, S. FURTADO, C. FRAJUCA, P. J. CASTRO, J. J. BARROSO, and M. REMY. "SUPERCONDUCTOR REENTRANT CAVITIES FOR THE PARAMETRIC TRANSDUCERS OF THE BRAZILIAN MARIO SCHENBERG GRAVITATIONAL WAVE DETECTOR." In Proceedings of the MG10 Meeting held at Brazilian Center for Research in Physics (CBPF). World Scientific Publishing Company, 2006. http://dx.doi.org/10.1142/9789812704030_0253.

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Kuo, Chih-Jung, Ali Kosar, Michael K. Jensen, and Yoav Peles. "Boiling in Enhanced Surface Microchannels." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-82846.

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An experimental investigation is presented on flow boiling of de-ionized water in 227-μm hydraulic diameter microchannels with reentrant type cavities. Key features of nucleate boiling are discussed. Active nucleation site density, bubble frequency and departure diameter, and flow patterns over mass velocities ranging from 41 kg/m2-s to 302 kg/m2-s and heat fluxes ranging from 28 to 445 W/cm2 are studied. Similarities and differences with results obtained on large-scale systems and unenhanced microchannels are discussed.
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Paoloni, C., M. Mineo, H. Yin, L. Zhang, W. He, C. W. Robertson, K. Ronald, A. D. R. Phelps, and A. W. Cross. "Scaled design and test of a coupler for micro-reentrant square-cavities for millimeter wave klystrons." In 2013 14th International Vacuum Electronics Conference (IVEC). IEEE, 2013. http://dx.doi.org/10.1109/ivec.2013.6571015.

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