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Journal articles on the topic 'Reentrant cavities'

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

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1

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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2

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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3

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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4

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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5

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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6

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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7

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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8

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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9

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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10

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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11

Deng, Daxiang, Junyuan Feng, Qingsong Huang, Yong Tang, and Yunsong Lian. "Pool boiling heat transfer of porous structures with reentrant cavities." International Journal of Heat and Mass Transfer 99 (August 2016): 556–68. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2016.04.015.

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12

Domingues, Eddy M., Sankara Arunachalam, and Himanshu Mishra. "Doubly Reentrant Cavities Prevent Catastrophic Wetting Transitions on Intrinsically Wetting Surfaces." ACS Applied Materials & Interfaces 9, no. 25 (June 19, 2017): 21532–38. http://dx.doi.org/10.1021/acsami.7b03526.

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13

Awad, M. M. "Comments on “boiling heat transfer in rectangular microchannels with reentrant cavities”." International Journal of Heat and Mass Transfer 62 (July 2013): 541–42. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2013.03.022.

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14

Xia, Guodong, Lei Chai, Haiyan Wang, Mingzheng Zhou, and Zhenzhen Cui. "Optimum thermal design of microchannel heat sink with triangular reentrant cavities." Applied Thermal Engineering 31, no. 6-7 (May 2011): 1208–19. http://dx.doi.org/10.1016/j.applthermaleng.2010.12.022.

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15

Koşar, Ali, Chih-Jung Kuo, and Yoav Peles. "Reduced Pressure Boiling Heat Transfer in Rectangular Microchannels With Interconnected Reentrant Cavities." Journal of Heat Transfer 127, no. 10 (May 5, 2005): 1106–14. http://dx.doi.org/10.1115/1.2035107.

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Boiling flow of deionized water through 227μm hydraulic diameter microchannels with 7.5μm wide interconnected reentrant cavities at 47 kPa exit pressure has been investigated. Average two-phase heat transfer coefficients have been obtained over effective heat fluxes ranging from 28 to 445W∕cm2 and mass fluxes from 41 to 302kg∕m2s. A map is developed that divides the data into two regions where the heat transfer mechanisms are nucleation or convective boiling dominant. The map is compared to similar atmospheric exit pressure data developed in a previous study. A boiling mechanism transition criterion based on the Reynolds number and the Kandlikar k1 number is proposed.
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16

Le, Q., J. P. Franc, and J. M. Michel. "Partial Cavities: Global Behavior and Mean Pressure Distribution." Journal of Fluids Engineering 115, no. 2 (June 1, 1993): 243–48. http://dx.doi.org/10.1115/1.2910131.

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The results of an experimental work concerning the behavior of flows with partial cavities are presented. The tests were carried out using a plano-convex foil placed in the free surface channel of the I.M.G. Hydrodynamic Tunnel. The experimental conditions concerning ambient pressure, water velocity, and body size were such that various and realistic kinds of flows could be realized. The main flow regimes are described and correlated to the values of foil incidence and cavitation parameter. Attention is paid to the shedding of large vapor pockets into the cavity wake and its possible periodic character. Aside from classical consideration to the cavity length and shedding frequency in the periodic regime, results concerning the wall pressure distribution in the rear part of the cavity are given. They lead to distinguish thin, stable, and closed cavities from the thick ones in which the reentrant jet plays a dominant role for the shedding of vortical structures and the flow unsteadiness.
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17

Dietl, Jochen, and Peter Stephan. "Numerical simulation and modeling of liquid film evaporation inside axisymmetric reentrant cavities." MATEC Web of Conferences 18 (2014): 01005. http://dx.doi.org/10.1051/matecconf/20141801005.

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18

Sun, Yalong, Gong Chen, Shiwei Zhang, Yong Tang, Jian Zeng, and Wei Yuan. "Pool boiling performance and bubble dynamics on microgrooved surfaces with reentrant cavities." Applied Thermal Engineering 125 (October 2017): 432–42. http://dx.doi.org/10.1016/j.applthermaleng.2017.07.044.

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19

Sun, YaLong, FuYe Liang, Yong Tang, Heng Tang, XiaoQian Xi, Shu Yang, and Ting Fu. "Effect of stagger angle on capillary performance of microgroove structures with reentrant cavities." Science China Technological Sciences 64, no. 7 (June 16, 2021): 1436–46. http://dx.doi.org/10.1007/s11431-020-1783-x.

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20

Alvarez, Jose Oliverio, Felipe L. Penaranda-Foix, Jose M. Catala-Civera, and Jose D. Gutierrez-Cano. "Permittivity Spectrum of Low-Loss Liquid and Powder Geomaterials Using Multipoint Reentrant Cavities." IEEE Transactions on Geoscience and Remote Sensing 58, no. 5 (May 2020): 3097–112. http://dx.doi.org/10.1109/tgrs.2019.2948052.

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21

Chai, Lei, Guodong Xia, Liang Wang, and Mingzheng Zhou. "Gas–liquid two-phase flow patterns in microchannels with reentrant cavities in sidewall." Experimental Thermal and Fluid Science 53 (February 2014): 86–92. http://dx.doi.org/10.1016/j.expthermflusci.2013.11.005.

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22

Kim, Wookyoung, and Sung Jin Kim. "Effect of reentrant cavities on the thermal performance of a pulsating heat pipe." Applied Thermal Engineering 133 (March 2018): 61–69. http://dx.doi.org/10.1016/j.applthermaleng.2018.01.027.

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23

Muzhaimey, Syarif Syahrul Syazwan, Nik Nazri Nik Ghazali, Mohd Zamri Zainon, Irfan Anjum Badruddin, Mohamed Hussien, Sarfaraz Kamangar, and N. Ameer Ahammad. "Numerical Investigation of Heat Transfer Enhancement in a Microchannel with Conical-Shaped Reentrant Cavity." Mathematics 10, no. 22 (November 18, 2022): 4330. http://dx.doi.org/10.3390/math10224330.

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The current study is focused on improving the thermal performance of the microchannel heat sink (MCHS) using the passive reentrant cavity approach. The MCHS physical model’s single channel was used in a three-dimensional numerical simulation. The basic geometrical layout of the MCHS’s computational domain was drawn from previously published research and verified using numerical and analytical correlations that were already in existence. The innovative conical-shaped microchannel heat sink’s (CMCHS) properties for heat transmission and fluid flow were examined numerically under steady-state conditions with laminar flow and a constant heat flux. At various flow velocities and configurations, the impacts of the geometrical parameters on pressure drops and heat transfer were examined. The outcome demonstrates a tremendously positive thermal performance with a significantly greater pressure drop than the traditional straight channel. In the microchannels with the conical-shaped reentrant cavities and minimal pressure loss, convection heat transfer is significantly improved. The findings of the present investigation demonstrate that the conical-shaped MCHS is practical and has a good chance of being used in real-world settings.
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24

JIA, Yuting. "Entropy Generation Analysis of Flow and Heat Transfer in Microchannel with Droplet Reentrant Cavities." Journal of Mechanical Engineering 53, no. 04 (2017): 141. http://dx.doi.org/10.3901/jme.2017.04.141.

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25

Hou, Tingbo, and Yuanlong Chen. "Pressure drop and heat transfer performance of microchannel heat exchanger with different reentrant cavities." Chemical Engineering and Processing - Process Intensification 153 (July 2020): 107931. http://dx.doi.org/10.1016/j.cep.2020.107931.

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26

Chen, Gong, Mingze Jia, Shiwei Zhang, Yong Tang, and Zhenping Wan. "Pool boiling enhancement of novel interconnected microchannels with reentrant cavities for high-power electronics cooling." International Journal of Heat and Mass Transfer 156 (August 2020): 119836. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2020.119836.

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27

Belomestnykh, S. "Comment on “Higher order reentrant post modes in cylindrical cavities” [J. Appl. Phys.122, 144501 (2017)]." Journal of Applied Physics 123, no. 22 (June 14, 2018): 226101. http://dx.doi.org/10.1063/1.5021605.

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28

Piasecka, Magdalena. "An application of enhanced heating surface with mini-reentrant cavities for flow boiling research in minichannels." Heat and Mass Transfer 49, no. 2 (October 26, 2012): 261–75. http://dx.doi.org/10.1007/s00231-012-1082-y.

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29

McAllister, Ben T., and Michael E. Tobar. "Response to “Comment on ‘Higher order reentrant post modes in cylindrical cavities’” [J. Appl. Phys. 123, 226101 (2018)]." Journal of Applied Physics 123, no. 22 (June 14, 2018): 226102. http://dx.doi.org/10.1063/1.5024564.

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30

Xia, GuoDong, YuLing Zhai, and ZhenZhen Cui. "Characteristics of entropy generation and heat transfer in a microchannel with fan-shaped reentrant cavities and internal ribs." Science China Technological Sciences 56, no. 7 (May 20, 2013): 1629–35. http://dx.doi.org/10.1007/s11431-013-5244-z.

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31

Xia, Guodong, Yuling Zhai, and Zhenzhen Cui. "Numerical investigation of thermal enhancement in a micro heat sink with fan-shaped reentrant cavities and internal ribs." Applied Thermal Engineering 58, no. 1-2 (September 2013): 52–60. http://dx.doi.org/10.1016/j.applthermaleng.2013.04.005.

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32

Xia, Guodong, Lei Chai, Mingzheng Zhou, and Haiyan Wang. "Effects of structural parameters on fluid flow and heat transfer in a microchannel with aligned fan-shaped reentrant cavities." International Journal of Thermal Sciences 50, no. 3 (March 2011): 411–19. http://dx.doi.org/10.1016/j.ijthermalsci.2010.08.009.

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33

Liu, Xianfei, Hui Zhang, Caixia Zhu, Fang Wang, and Zhiqiang Li. "Effects of structural parameters on fluid flow and heat transfer in a serpentine microchannel with fan-shaped reentrant cavities." Applied Thermal Engineering 151 (March 2019): 406–16. http://dx.doi.org/10.1016/j.applthermaleng.2019.02.033.

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34

Arunachalam, Sankara, Zain Ahmad, Ratul Das, and Himanshu Mishra. "Counterintuitive Wetting Transitions in Doubly Reentrant Cavities as a Function of Surface Make‐Up, Hydrostatic Pressure, and Cavity Aspect Ratio." Advanced Materials Interfaces 7, no. 22 (October 7, 2020): 2001268. http://dx.doi.org/10.1002/admi.202001268.

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35

Bala Subrahmanyam, K., Pritam Das, and Aparesh Datta. "Numerical investigation on fluid flow and convective heat transfer in a microchannel heat sink with fan-shaped cavities and ribs." Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering 235, no. 4 (January 12, 2021): 785–99. http://dx.doi.org/10.1177/0954408920987433.

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In the present study, a detailed numerical simulations of liquid flow in microchannel heat sink with four different geometry of ribs: rectangular (RR), backward triangular (BTR), forward triangular (FTR) and diamond (DR) arranged symmetrically inside reentrant fan shaped cavities (FC) on side walls has been conducted and compared with smooth channel (SC) to acquire fluid flow and heat transfer characteristics between Reynolds numbers of 136−588. The local pressure, temperature and heat transfer coefficients were determined to understand the convective heat transfer regimes and to analyze local flow behavior. The three-dimensional conjugate heat transfer model, investigation is done extensively to identify the influence of geometrical parameters towards augmenting thermal performance with parametric optimization. Evolved governing equations are solved by using SIMPLEC algorithm. Attempt has been made to improve heat extraction ability with reasonable pressure drop by replacing the existing simple design of microsink. It is observed that Nusselt number and friction factor are in good agreement with previous experimental data. Based on detailed parametric study, it was found that FC-RR is good in achieving maximum Nusselt number, but due to higher pressure drop penalty giving lower performance. Out of four proposed, FC-DR is conferring upstanding balance between heat transfer, pressure drop and giving the best thermal performance of 1.97 at Re = 391.47.
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36

Chai, Lei, Guodong Xia, Mingzheng Zhou, and Jian Li. "Numerical simulation of fluid flow and heat transfer in a microchannel heat sink with offset fan-shaped reentrant cavities in sidewall." International Communications in Heat and Mass Transfer 38, no. 5 (May 2011): 577–84. http://dx.doi.org/10.1016/j.icheatmasstransfer.2010.12.037.

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37

Zhai, Y. L., G. D. Xia, X. F. Liu, and Y. F. Li. "Heat transfer in the microchannels with fan-shaped reentrant cavities and different ribs based on field synergy principle and entropy generation analysis." International Journal of Heat and Mass Transfer 68 (January 2014): 224–33. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2013.08.086.

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38

Srinivasan, S., S. Brandenburg, J. M. Schippers, and P. A. Duperrex. "Development of a fourfold dielectric-filled reentrant cavity as a beam position monitor (BPM) in a proton therapy facility." Journal of Instrumentation 17, no. 09 (September 1, 2022): P09013. http://dx.doi.org/10.1088/1748-0221/17/09/p09013.

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Abstract At the Paul Scherrer Institute (PSI), the superconducting cyclotron “COMET” delivers a 250 MeV proton beam for radiation therapy in pulses of 1ns at the cyclotron-RF frequency of 72.85 MHz. Accurate measurement of the beam position at proton beam currents of 0.1–10 nA in the beam transport line downstream of the degrader is of crucial importance for the treatment safety and quality, beam alignment and feedback systems. This is essential for efficient operation and beam delivery. These measurements are usually performed with intercepting monitors such as ionization chambers (ICs). In this paper, we present a novel non-intercepting position sensitive cavity resonator. The resonant monitor, tuned to the second harmonic of the cyclotron's RF, is based on the detection of the transverse magnetic dipole mode of the EM field generated by the beam. This mode is only excited for off-center beam positions and is measured with the help of four floating cavities within a common grounded cylinder. This paper discusses the BPM fundamental characteristics, design optimization and the underlying parametric investigations involving the contribution of the different modes and crosstalk. We estimate the expected signals from the prototype BPM for position offsets from simulations and compare them with test-bench measurements and beam measurements with the prototype and the improvised BPM design. We conclude by summarizing the achieved position sensitivity, precision, and measurement bandwidth.
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39

Pan, Minqiang, Yujian Zhong, and Yufeng Xu. "Numerical investigation of fluid flow and heat transfer in a plate microchannel heat exchanger with isosceles trapezoid-shaped reentrant cavities in the sidewall." Chemical Engineering and Processing - Process Intensification 131 (September 2018): 178–89. http://dx.doi.org/10.1016/j.cep.2018.07.018.

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40

Kubo, H., Hiroshi Takamatsu, and Hiroshi Honda. "BOILING HEAT TRANSFER FROM A SILICON CHIP IMMERSED IN DEGASSED AND GAS-DISSOLVED FC-72: EFFECTED BY SIZE AND NUMBER DENSITY OF MICRO-REENTRANT CAVITIES." Journal of Enhanced Heat Transfer 24, no. 1-6 (2017): 269–78. http://dx.doi.org/10.1615/jenhheattransf.v24.i1-6.190.

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41

Kubo, H., Hiroshi Takamatsu, and Hiroshi Honda. "Effects of Size and Number Density of Micro-reentrant Cavities on Boiling Heat Transfer from a Silicon Chip Immersed in Degassed and Gas-dissolved FC-72." Journal of Enhanced Heat Transfer 6, no. 2-4 (1999): 151–60. http://dx.doi.org/10.1615/jenhheattransf.v6.i2-4.80.

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42

Arunachalam, Sankara, Zain Ahmad, Ratul Das, and Himanshu Mishra. "Wetting Transitions: Counterintuitive Wetting Transitions in Doubly Reentrant Cavities as a Function of Surface Make‐Up, Hydrostatic Pressure, and Cavity Aspect Ratio (Adv. Mater. Interfaces 22/2020)." Advanced Materials Interfaces 7, no. 22 (November 2020): 2070121. http://dx.doi.org/10.1002/admi.202070121.

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43

Hou, Tingbo, and Yuanlong Chen. "Pressure Drop and Heat Transfer Performance of Microchannel Heat Exchanger With Circular Reentrant Cavities and Ribs." Journal of Heat Transfer 142, no. 4 (February 20, 2020). http://dx.doi.org/10.1115/1.4045759.

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Abstract The rib arrangement has an important influence on the pressure drop and heat transfer performance of a microchannel heat exchanger (MHE) with circular reentrant cavities and ribs. In this study, four kinds of MHEs with circular reentrant cavity and ribs were designed, namely, circular reentrant cavities (circular), circular reentrant cavities and single-sided ribs (circular—single), circular reentrant cavities and odd-symmetric ribs (circular—odd), and circular reentrant cavities and double symmetric ribs (circular—double). The effect of the rib arrangement on the pressure drop and heat transfer performance of MHEs was numerically investigated by ansysfluent 15.0. The experimental platform was then designed and built for the subsequent experimental verification. The results showed that the pressure drop between the inlet and outlet of the MHE with circular reentrant cavities and ribs increased as the inlet flow increased. At the same inlet flowrate, the pressure drop between the inlet and outlet of the MHEs was largest for the circular reentrant cavities and double symmetric ribs, followed by the circular reentrant cavities and odd-symmetric ribs, circular reentrant cavities and single-sided ribs, and the circular reentrant cavities. The presence of the rib structure increased the inlet and outlet pressure drop of the MHE. The MHE with circular reentrant cavities and double symmetric ribs had the largest inlet and outlet pressure drop, followed by that with circular reentrant cavities and odd-symmetric ribs, that with circular reentrant cavities and single-sided ribs, and that with circular reentrant cavities, indicating that the latter exhibited the best pressure drop performance. At the same inlet flowrate, the MHE with circular reentrant cavities had the highest hot water outlet temperature and the MHE with circular reentrant cavities and double symmetric ribs had the lowest temperature, whereas the results were the opposite for the cold-water outlet temperature. This indicates that the heat transfer performance was best for the MHE with circular reentrant cavities and double symmetric ribs, followed by that with circular reentrant cavities and odd-symmetric ribs and that with circular reentrant cavities and single-sided ribs.
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44

Kuo, C. J., and Y. Peles. "Flow Boiling Instabilities in Microchannels and Means for Mitigation by Reentrant Cavities." Journal of Heat Transfer 130, no. 7 (May 16, 2008). http://dx.doi.org/10.1115/1.2908431.

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The ability of reentrant cavities to suppress flow boiling oscillations and instabilities in microchannels was experimentally studied. Suppression mechanisms were proposed and discussed with respect to various instability modes previously identified in microchannels. It was found that structured surfaces formed inside channel walls can assist mitigating the rapid bubble growth instability, which dominates many systems utilizing flow boiling in microchannels. This, in turn, delayed the parallel channel instability and the critical heat flux (CHF) condition. Experiments were conducted using three types of 200×253μm2 parallel microchannel devices: with reentrant cavity surface, with interconnected reentrant cavity surface, and with plain surface. The onset of nucleate boiling, CHF condition, and local temperature measurements were obtained and compared in order to study and identify flow boiling instability.
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45

Kuo, C. J., and Y. Peles. "Flow Boiling of Coolant (HFE-7000) Inside Structured and Plain Wall Microchannels." Journal of Heat Transfer 131, no. 12 (October 15, 2009). http://dx.doi.org/10.1115/1.3220674.

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Flow boiling was experimentally studied using coolant HFE-7000 for two types of parallel microchannels: a plain-wall microchannel and a microchannel with structured reentrant cavities on the side walls. Flow morphologies, boiling inceptions, heat transfer coefficients, and critical heat fluxes were obtained and studied for mass fluxes ranging from G=164 kg/m2 s to G=3025 kg/m2 s and mass qualities (energy definition) ranging from x=−0.25 to x=1. Comparisons of the performance of the enhanced and plain-wall microchannels were carried out. It was found that reentrant cavities were effective in reducing the superheat at the onset of nucleate boiling and increasing the heat transfer coefficient. However, they did not seem to increase the critical heat flux.
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46

Arunachalam, Sankara, Eddy M. Domingues, Ratul Das, Jamilya Nauruzbayeva, Ulrich Buttner, Ahad Syed, and Himanshu Mishra. "Rendering SiO2/Si Surfaces Omniphobic by Carving Gas-Entrapping Microtextures Comprising Reentrant and Doubly Reentrant Cavities or Pillars." Journal of Visualized Experiments, no. 156 (February 11, 2020). http://dx.doi.org/10.3791/60403.

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47

Feng, Tianqi, Chengyong Yu, En Li, and Yu Shi. "The application of the BOR-FEM in a re-entrant cavity for fast and accurate dielectric parameter measurements." Chinese Physics B, July 8, 2022. http://dx.doi.org/10.1088/1674-1056/ac7f91.

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Abstract In dielectrometry application, traditional analytical and numerical algorithms are hardly employed in complex resonant cavities. For a special kind of structure (rotating resonant cavity), the BOR-FEM is well employed to calculate the resonant parameters and dielectric parameters. In this paper, several typical resonant structures are selected for analysis and verification. Compared with the resonance parameter values in the literature and the simulation results of commercial software, the error of the BOR-FEM calculation is less than 0.9% and the solution time of a single time is less than 1s. The reentrant coaxial resonant cavities loaded with dielectric materials were analyzed using this method and compared with the simulation results, which showed a high accuracy. Finally, in this paper, the machined cavity with the established BOR-FEM method is successfully applied to the accurate measurement of the complex dielectric constant of dielectric materials. The test specimens were machined from PTFE, fused silica and Al2O3, and the test results showed good agreement with the literature reference values.
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48

Li, Xiaojun, Yaoyao Liu, Zuchao Zhu, Peifeng Lin, and Linmin Li. "Boundary Vorticity Analysis and Shedding Dynamics of Transient Cavitation Flow Around a Twisted Hydrofoil." Journal of Fluids Engineering 143, no. 7 (April 9, 2021). http://dx.doi.org/10.1115/1.4050135.

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Abstract The objective of this paper is to investigate the dynamic characteristics of transient cavitating flow over a twisted NACA0009 hydrofoil. The large eddy simulation (LES) approach is selected for the computation of fluid flow and the Zwart model is used for the mass transfer due to cavitation. Moreover, the skin-friction coefficient and boundary-vorticity flux (BVF) are used to study the flow separation. Numerical results show that the attached shear layer separates from the boundary layer and then squeezes to form the separation line under the obstruction of the reentrant jet. The analysis based on the terms of vorticity transport equation demonstrates that vortex stretching and vortex dilatation terms dominate the evolution of the multiscale vortex. Moreover, the secondary shedding induced by the side-entrant jet enhances the instability of partial cavities and the underlying mechanism is comprehensively revealed. Furthermore, the feature of the pressure fluctuation indicates that high pressure generated by the cavity collapse at the tail simultaneously propagates to the leading edge and downstream of the hydrofoil. This enhances the intensity of the reentrant jet and side-entrant jet, promoting occurrences of flow separation near the suction surface and cavity shedding to a certain extent.
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49

Oliveira, Rogério Moraes, Odylio Denys Aguiar, Michel Felipe Lima de Araujo, Matheus M. N. F. Silva, Carina B. Mello, Elvis Ferreira, Vincenzo Liccardo, Graziela da Silva Savonov, Koumei Baba, and Renata Lopes Gonçalves de Souza. "The Surface Treatment of Niobium Superconducting Reentrant Cavities by Means of High Temperature Nitrogen Plasma Based Ion Implantation." Materials Research 22, no. 6 (2019). http://dx.doi.org/10.1590/1980-5373-mr-2019-0277.

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50

Zhou, Lingjiu, and Zhengwei Wang. "Numerical Simulation of Cavitation Around a Hydrofoil and Evaluation of a RNG κ-ε Model." Journal of Fluids Engineering 130, no. 1 (December 19, 2007). http://dx.doi.org/10.1115/1.2816009.

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Cavitating flow around a hydrofoil was simulated using a transport equation-based model with consideration of the influence of noncondensable gases. The cavity length and the pressure distributions on the suction side can be well predicted for stable cavities using the standard renormalization-group (RNG) κ-ε turbulence model with proper noncondensable gas mass fraction. The unstable cavity shedding at lower cavitation numbers was not well predicted by the standard RNG κ-ε turbulence model. A modified RNG κ-ε turbulence model was evaluated by comparing the calculated spatial-temporal pressure distributions on the suction wall with experimental data. The results showed that the predicted cavity growth and shedding cycle and its frequency agree well with the experimental data. However, the pressure increase caused by interaction of the reentrant flow and the cavity interface is overestimated, which caused the time-averaged pressure on the front part of the hydrofoil to be overestimated. The time-averaged pressure on the rear of the hydrofoil was low because the small cavity shedding on the rear part of the cavity was not predicted.
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