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Добірка наукової літератури з теми "Material of the baffle"

Автор: Grafiati

Опубліковано: 30 травня 2022

Оновлено: 31 травня 2022

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Статті в журналах з теми "Material of the baffle"

Chen, Cong, Dongji Xuan, Mingge Wu, Shengnan Liu, and Yunde Shen. "Performance and Parameter Sensitivity Analysis of the PEMFC Flow Channel with Porous Baffles." Applied Sciences 11, no. 24 (December 15, 2021): 11942. http://dx.doi.org/10.3390/app112411942.

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In this paper, a method to improve the performance of PEMFCs using porous material as a flow channel baffle is proposed. The results show that PEMFCs with four porous baffles flow channels have better performance at high current density compared with the traditional flow channel. The structural parameters of the flow channel explored in this study include porosity, the thickness of the baffle and the number of baffles, and their influence on the performance of PEMFCs. Sensitivity analysis results show that the performance of the PEMFCs with the porous baffle channel is the most sensitive to baffle thickness, and the thickness and baffle could be appropriately adjusted. The number of plates and porosity of the baffle are adjusted to improve the performance of the PEMFCs.

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Jeng, Tzer-Ming, and Sheng-Chung Tzeng. "Study of Flow and Heat Transfer Characteristics in Asymmetrically Heated Sintered Porous Heat Sinks With Periodical Baffles." Journal of Electronic Packaging 128, no. 3 (August 18, 2005): 226–35. http://dx.doi.org/10.1115/1.2229220.

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This work numerically examined the mechanism of heat transfer in a sintered porous heat sink with baffles. A channel filled with the sintered porous heat sink was asymmetrically heated and metallic baffles were periodically mounted on the heated surface. The fluid medium was air. The results indicate that no recirculation occurred between baffles. The metallic baffle obtained heat from the heated surface by conduction directly from the heated surface and indirectly through the porous media. It dissipated heat to the fluid that passed over the zone above the baffle. The Nusselt numbers in the cases with baffles exceeded those in cases without a baffle. The enhancement in the average Nusselt numbers of sintered porous heat sinks with baffles increased as the Reynolds number (Re) declined; the baffle height (h∕H) increased; the baffle length (w∕H) increased, or the baffle pitch (XL) decreased. However, at Re=500, the average Nusselt number in the case with h∕H=0.3 was higher than those with h∕H=0.7, 0.5, and 0.1. Additionally, the minimum enhancement appeared at around Re=3000 for various h∕H, w∕H, and XL. For the cases with h∕H⩽0.3 and various w∕H as well as XL, at Re>3000, sintered porous heat sinks with baffles insignificantly improved heat transfer.

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Zhu, Aimeng, Mi-An Xue, Xiaoli Yuan, Feng Zhang, and Wei Zhang. "Effect of Double-Side Curved Baffle on Reducing Sloshing in Tanks under Surge and Pitch Excitations." Shock and Vibration 2021 (February 19, 2021): 1–17. http://dx.doi.org/10.1155/2021/6647604.

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Sloshing is associated with the structural safety of liquid storage vessel. Installing the baffles inside the containers would be beneficial for the mitigating the damage due to the severe sloshing. In this study, an innovative type of double-side curved baffle was proposed to evaluate its effect on reducing sloshing in a rectangular tank under surge and pitch excitation. For comparison with conventional baffles, effects of the vertical baffle and the T-type baffle on mitigating sloshing were also studied experimentally and numerically by analyzing the free surface wave elevation as well as the hydrodynamic pressure on the tank wall. The effective stress at the double-side curved baffle along the height direction of the baffle is much smaller than that at the T-type baffle although they have the same mitigation effect on sloshing wave heights. The sloshing-induced effective stress on the double-side curved baffles was analyzed by varying their radian. Findings show that the effective stress on the baffle tends to decrease with the increase in the radian. The velocity field was presented to observe effect of the baffles on sloshing with the aid of ADINA and laboratory experiments conducted on a hexapod motion platform.

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Yasuo, A., and M. P. Paidoussis. "Flow-Induced Instability of Heat-Exchanger Tubes due to Axial Flow in a Diffuser-Shaped, Loose Intermediate Support." Journal of Pressure Vessel Technology 111, no. 4 (November 1, 1989): 428–34. http://dx.doi.org/10.1115/1.3265700.

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In some heat exchangers and steam generators, the flow is predominantly axial, and the external fluid flows between baffled compartments through enlarged holes in the baffles around the heat exchanger tubes. Thus, the tube is subjected to relatively high flow velocities over small portions of its length, in the baffle locations. In this paper, the dynamics of such an idealized system is investigated, involving a cylindrical beam with pinned ends in axial flow, going through a baffle plate of finite thickness at some intermediate point, with small radial clearance. The fluid forces along the tube are formulated in a manner reminiscent of the transfer-matrix technique, since the character of these forces changes drastically along the tube. The fluid forces are determined approximately by means of potential flow theory, and viscous effects are taken into account only in a global sense. It was found that if the flow passage through the baffle plate is diffuser-shaped, negative fluid-dynamic damping is generated therein, destabilizing the system and leading to flutter at relatively low flow velocities. The instability depends critically on the shape of the hole through the baffle and on the clearance; thus a convergent-type flow passage does not lead to instability. The negative fluid-dynamic damping is linearly proportional to the flow velocity through the baffle.

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Abu-Hijleh, Bassam A/K. "Mixed Convection From a Cylinder With Low Conductivity Baffles in Cross-Flow." Journal of Heat Transfer 124, no. 6 (December 1, 2002): 1064–71. http://dx.doi.org/10.1115/1.1518494.

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The problem of laminar mixed convection from an isothermal cylinder with low conductivity baffles in cross flow was solved numerically. The average Nusselt number was calculated at different combinations of number of baffles, baffle height, Reynolds number, and buoyancy parameter. The reduction in the Nusselt number is as much as 75 percent. When using a small number of baffles at low values of buoyancy parameter, an odd number of baffles reduced the Nusselt number more than an even number of baffles, especially at high values of Reynolds number. This is not the case at high values of buoyancy parameter. There is an optimal baffle height, Reynolds number dependent, for maximum heat transfer reduction beyond which an increase in baffle height does not result in further decrease in heat transfer.

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Menni, Younes, Ahmed Azzi, and A. Chamkha. "Modeling and analysis of solar air channels with attachments of different shapes." International Journal of Numerical Methods for Heat & Fluid Flow 29, no. 5 (May 7, 2019): 1815–45. http://dx.doi.org/10.1108/hff-08-2018-0435.

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Purpose This paper aims to report the results of numerical analysis of turbulent fluid flow and forced-convection heat transfer in solar air channels with baffle-type attachments of various shapes. The effect of reconfiguring baffle geometry on the local and average heat transfer coefficients and pressure drop measurements in the whole domain investigated at constant surface temperature condition along the top and bottom channels’ walls is studied by comparing 15 forms of the baffle, which are simple (flat rectangular), triangular, trapezoidal, cascaded rectangular-triangular, diamond, arc, corrugated, +, S, V, double V (or W), Z, T, G and epsilon (or e)-shaped, with the Reynolds number changing from 12,000 to 32,000. Design/methodology/approach The baffled channel flow model is controlled by the Reynolds-averaged Navier–Stokes equations, besides the k-epsilon (or k-e) turbulence model and the energy equation. The finite volume method, by means of commercial computational fluid dynamics software FLUENT is used in this research work. Findings Over the range investigated, the Z-shaped baffle gives a higher thermal enhancement factor than with simple, triangular, trapezoidal, cascaded rectangular-triangular, diamond, arc, corrugated, +, S, V, W, T, G and e-shaped baffles by about 3.569-20.809; 3.696-20.127; 3.916-20.498; 1.834-12.154; 1.758-12.107; 7.272-23.333; 6.509-22.965; 8.917-26.463; 8.257-23.759; 5.513-18.960; 8.331-27.016; 7.520-26.592; 6.452-24.324; and 0.637-17.139 per cent, respectively. Thus, the baffle of Z-geometry is considered as the best modern model of obstacles to significantly improve the dynamic and thermal performance of the turbulent airflow within the solar channel. Originality/value This analysis reports an interesting strategy to enhance thermal transfer in solar air channels by use of attachments with various shapes

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Habib, M. A., A. M. Mobarak, M. A. Sallak, E. A. Abdel Hadi, and R. I. Affify. "Experimental Investigation of Heat Transfer and Flow Over Baffles of Different Heights." Journal of Heat Transfer 116, no. 2 (May 1, 1994): 363–68. http://dx.doi.org/10.1115/1.2911408.

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The phenomenon of flow separation in ducts with segmented baffles has many engineering applications, for example, shell-and-tube heat exchangers with segmented baffles, labyrinth shaft seals, laser curtain seals, air-cooled solar collectors, and internally cooled turbine blades. In the present work, an experimental investigation has been done to study the characteristics of the turbulent flow and heat transfer inside the periodic cell formed between segmented baffles staggered in a rectangular duct. In particular, flow field, pressure loss, and local and average heat transfer coefficients were obtained. The experimental runs were carried out for different values of Reynolds numbers and baffle heights (window cuts) at uniform wall heat flux condition along the top and bottom walls. The results indicate that the pressure loss increases as the baffle height does, for a given flow rate. Also, the local and average heat transfer parameters increase with increasing Reynolds number and baffle height. However, the associated increase in the pressure loss was found to be much higher than the increase in the heat transfer coefficient.

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Eisinger, F. L., and R. E. Sullivan. "Suppression of Acoustic Waves in Steam Generator and Heat Exchanger Tube Banks." Journal of Pressure Vessel Technology 125, no. 2 (May 1, 2003): 221–27. http://dx.doi.org/10.1115/1.1565079.

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Tube banks located in flow channels and exposed to crossflow have a low resistance to acoustic resonance and vibration in general. Such resistance can be increased substantially by placing acoustic baffles inside the tube banks. The locations and the number of baffles play an important role in the degree of their effectiveness of suppressing acoustic waves. One or two baffles placed within a tube bank will raise the threshold to acoustic vibration significantly. Optimum baffle locations suppressing acoustic resonance and vibration or reducing noise levels at resonance can be determined. A general procedure based on acoustic particle velocity mode shape functions is presented for the evaluation of the acoustic baffle effects.

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Ren, Lv, Yinjie Zou, Jinbo Tang, Xin Jin, Dengsong Li, and Mingming Liu. "Numerical Modeling of Coupled Surge-Heave Sloshing in a Rectangular Tank with Baffles." Shock and Vibration 2021 (May 31, 2021): 1–11. http://dx.doi.org/10.1155/2021/5545635.

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Liquid sloshing under coupled surge and heave excitations in a rectangular tank has been numerically investigated by applying a Navier–Stokes solver. Fieriest coupled sloshing was further considered, and the internal baffle was expected to suppress the violent sloshing wave. After getting fully validated against available results from the literatures, the numerical model was applied to research coupled sloshing, and both vertical baffle and horizontal baffle have been considered. Due to the strong vortexes created by the sharper corners of the baffles and the reduction of the effective water bulk climbing through the tank walls, the sloshing was dramatically reduced. The increase of the baffle distance away from the tank bottom led to a decrease in the sloshing wave. It was noted that the baffle near the free surface caused the maximal dissipation. The frequency response of the sloshing wave was accordingly illustrated.

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Fernandes, Erica Jacqueline, and Sachidananda Hassan Krishanmurthy. "Design and analysis of shell and tube heat exchanger." International Journal for Simulation and Multidisciplinary Design Optimization 13 (2022): 15. http://dx.doi.org/10.1051/smdo/2022005.

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The demand for consumption of energy in industries has made designers to build efficient heat transfer exchangers. One of the most used heat exchangers which supports this is the shell and tube heat exchangers which are built for effective heat transfer. These heat exchangers are widely utilized in the HVAC industries especially in chiller plants due to their large surface for heat transfer. So, design of these chillers is influenced by the selection of material. This research paper discusses the design and analysis of shell and tube heat exchangers by considering different material and their ability to transfer heat from the surface. So, baffles play an important role to analyze the performance of the heat exchangers and it is possible to improve their heat transfer capabilities. So, in this research paper baffle spacing and its effect on heat transfer has been analyzed using CFD analysis and compared these results with the theoretical analysis. The Design and modelling of the heat exchanger have been modelled using PTC Creo parametric and using ANSYS Fluent CFD analysis have been carried out considering copper, aluminum, and steel as the materials. From this analysis it can be stated that copper has performed well as compared to aluminum and steel by using minimum baffle spacing.

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Дисертації з теми "Material of the baffle"

Hunt, Cassandra R. "Baffle material characterization for Advanced LIGO." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/44820.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Physics, 2008.
Includes bibliographical references (p. 43-45).
The transition to Advanced LIGO introduces new sensitivity requirements for the LIGO interferometers. When light scatters away from the main laser beam, then scatters off the beam tube and returns to the main beam, noise is introduced into the phase of the laser. The Auxiliary Optics Support subsystem uses baffles and beam dumps to control this scatter, but the baffle material and shape contribute some scatter as well. Careful selection of baffle material for Advanced LIGO is necessary in order to minimize baffle backscatter. Characterization of potential materials will also inform the geometry and placement of baffles. To this end, I developed a scatterometer experiment designed to measure the Bidirectional Reflectance Distribution Function (BRDF) of a material. The arrangement was used to measure the BRDF for black welder's glass, the prime candidate material for baffles in Advanced LIGO. I found that black glass has a BRDF on the order of 10-, putting it within sensitivity requirements.
by Cassandra R. Hunt.
S.B.

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Belyaeva, A. I., A. A. Galuza, I. V. Kolenov, V. G. Konovalov, Alla Aleksandrovna Savchenko, and O. A. Skoryk. "Effect of sputtering on the samples of iter-grade tungsten preliminarilly irradiated by tungsten ions: optical investigations." Thesis, Національний науковий центр "Харківський фізико-технічний інститут", 2014. http://repository.kpi.kharkov.ua/handle/KhPI-Press/48176.

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Morberg, Hampus. "Conceptual Speaker Study." Thesis, Tekniska Högskolan, Högskolan i Jönköping, JTH, Maskinteknik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-25081.

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This thesis project is a stand-alone project with the goal to develop an optimized material suited for speaker cabinets, with the focus on acoustic abilities, production possibilities and environmental impact. And to further on design a high performance to price speaker, using the developed material properties and todays technology. The thesis is focused heavily on testing material, starting with research and thereafter creating and testing samples, to continue with find a material combination that would work for a product fit for the market. The final product should fulfill the demands of typical furniture handling, meaning it should be able to be moved around and withstand moderate abuse from daily events. The project results in a functional prototype for evaluation of material and the overall design. The project is based on design methods and design thinking.

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Ko, Kang-Hoon. "Heat transfer enhancement in a channel with porous baffles." Texas A&M University, 2004. http://hdl.handle.net/1969.1/1519.

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An experimental and numerical investigation of heat transfer enhancement in a three dimensional channel using wall mounted porous baffles was conducted. The module average heat transfer coefficients were measured in a uniformly heated rectangular channel with staggered positioned porous baffles. A numerical procedure was implemented, in conjunction with a commercially available Navier-Stokes solver, to model the turbulent flow in porous media. The Brinkman-Forchheimer-Extended Darcy model was used for modeling fluid flow through the porous baffles. Conventional, oneequation, and two-equation models were used for heat transfer modeling. The accuracy and characteristics of each model were investigated and discussed. The results were compared with experimental data. Baffles were mounted alternatively on the top and bottom walls. Heat transfer coefficients and pressure loss for periodically fully developed flow and heat transfer were obtained for different pore densities (10, 20, and 40 pores per inch (PPI)) with two different baffle heights ( / h h B D = 1/3 and 2/3), and two baffle thicknesses ( / t h B D = 1/3 and 1/12). The Reynolds number (Re) was varied from 20,000 to 50,000. To compare the effect of foam metal baffles, the data for conventional solid-type baffles was obtained for ( / t h B D =1/3). The maximum uncertainties associated with the module Nusselt number and friction factor were 5.8% and 4.3%, respectively. The experimental procedure was validated by comparing the data for the straight channel without baffles ( / h h B D = 0) with those in the literature. The use of porous baffles resulted in heat transfer enhancement as high as 300% compared to heat transfer in straight channels without baffles. However, the heat transfer enhancement per unit increase in pumping power was less than one for the range of parameters studied in this work. Correlation equations were developed for the heat transfer enhancement ratio and the heat transfer enhancement per unit increase in pumping power in terms of Reynolds number. The conventional theoretical model, the dispersion conductivity model, and the modified two-phase model using the local thermal non-equilibrium theory were considered. The results from each model were compared against the experimental data, and compared to each other to investigate the efficiency of each model. Also, the characteristics of each model were discussed.

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Marshall, Laurie D. "Transducer-baffle interaction." Thesis, Georgia Institute of Technology, 1995. http://hdl.handle.net/1853/15821.

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Bektas, Murat [Verfasser]. "BaFe(1-x)-0.01Al0.01TaxO3-δ: A material for temperature independent resistive and thermoelectric oxygen sensors / Murat Bektas." Düren : Shaker, 2020. http://d-nb.info/1215461763/34.

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Gullason, Lynda. "Engendering interaction : Inuit-European contact in Frobisher Bay, Baffin Island." Thesis, McGill University, 1998. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=35893.

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This thesis seeks to identify the mosaic, rather than the monolithic, nature of culture contact by integrating historical and archaeological sources relating to the concept of gender roles, as they influence response within a contact situation. Specifically, I examine how the Inuit gender system structured artifact patterning in Inuit-European contact situations through the investigation of three Inuit sites in Frobisher Bay, Baffin Island. These date from the 16th, 19th and early 20th centuries and represent a variety of seasonal occupations and dwelling forms.
The ethnographic data suggest that Inuit gender relations were egalitarian and complementary. On this basis I hypothesize that European goods and materials were used equally by men and women. Within each gendered set of tasks, European goods and materials were differently used, according to empirically functional criteria such as the nature of the tasks.
Opportunities for and responses to European contact differed depending on the types of tasks in which Inuit women and men engaged and the social roles they played. Seasonality of occupation bears upon the archaeological visibility of gender activities.
Sixteenth-century Elizabethan contact did not alter Nugumiut gender roles, tasks, authority or status but served primarily as a source of raw material, namely wood and iron. Based on the analysis of slotted tools I suggest a refinement to take account of the overlap in blade thickness that occurs for metal and slate, and which depends on the function of the tool. I conclude that there was much more metal use by Thule Inuit than previously believed. However, during Elizabethan contact and shortly afterwards there was actually less metal use by the Nugumiut than in the prehistoric era.
Little archaeological evidence was recovered for 19th-century commercial whaling contact, (suggesting geographic marginality to European influence), or for 19th century Inuit occupation in the area. This is partly because of immigration to Cumberland Sound and because of subsequent structural remodelling of the dwellings by later occupants.
By the early 20th century, the archaeological record showed not only equal use of European material across gender but a near-ubiquitous distribution across most activity classes, even though commercial trapping never replaced traditional subsistence pursuits but only supplemented them.

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Milligan, David J. "The baffle aperture region of an ion thruster." Thesis, University of Southampton, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.342779.

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Fu, Yanqing. "Dynamic Emission Baffle Inspired by Horseshoe Bat Noseleaves." Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/64906.

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The evolution of bats is characterized by a combination of two key innovations - powered flight and biosonar - that are unique among mammals. Bats still outperform engineered systems in both capabilities by a large margin. Bat biosonar stands out for its ability to encode and extract sensory information using various mechanisms such as adaptive beam width control, dynamic sound emission and reception, as well as cognitive processes. Due to the highly integrated and sophisticated design of their active sonar system, bats can survive in complex and dense environments using just a few simple smart acoustic elements. On the sound emission side, significant features that distinguish bats from the current man-made sonar system are the time-variant shapes of the noseleaves. Noseleaves are baffles that surround the nostrils in bats with nasal pulse emission such as horseshoe bats and can undergo non-rigid deformations large enough to affect their acoustic properties significantly. Behavioral studies have shown that these movements are not random byproducts, but are due to specific muscular action. To understand the underlying physical and engineering principles of the dynamic sensing in horseshoe bats, two experimental prototypes ,i.e. intact noseleaf and simplified noseleaf, have been used. We have integrated techniques of data acquisition, instrument control, additive manufacturing, signal processing, airborne acoustics, 3D modeling and image processing to facilitate this research. 3D models of horseshoe bat noseleaves were obtained by tomographic imaging, reconstructed, and modified in the digital domain to meet the needs of additive manufacturing prototype. Nostrils and anterior leaf were abstracted as an elliptical outlet and a concave baffle in the other prototype. As a reference, a circular outlet and a straight baffle designed. A data acquisition and instrument control system has been developed and integrated with transducers to characterize the dynamic emission system acoustically as well as actuators for recreating the dynamics of the horseshoe bat noseleaf. A conical horn and tube waveguide was designed to couple the loudspeaker to the outlet of bat noseleaf and simplified baffles. A pan-tilt was used to characterize the acoustic properties of the deforming prototypes over direction. By using those techniques, the dynamic effect of the noseleaf was reproduced and characterized. It was suggested that the lancet rotation induced both beam-gain and beamwidth changes. Narrow outlet produced an isotropic beampattern and concave baffle had a significant time-variant and frequency-variant effect with just a small displacement. All those results cast light on the possible functions of the biological morphology and provided new thoughts on the engineering device's design.
Ph. D.

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Santos, Nicolau Braga. "Heat transfer in channels with solid and porous baffles." Instituto Tecnológico de Aeronáutica, 2006. http://www.bd.bibl.ita.br/tde_busca/arquivo.php?codArquivo=303.

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This work focuses on the study of flow and heat transfer in a parallel plate channel with solid and porous baffles, in both laminar and turbulent regimes by using numerical simulations. The main concern is to validate results by using a unique set of equations (for porous, solid and clear domain) for channels with solid baffles, after that change solid to porous baffles and study the effects on flow and heat transfer. Porous medium is treated as rigid, homogeneous and isotropic. The macroscopic transport equations are written for an elementary representative volume, yielding a set of equation valid for the entire computational domain. These equations are discretized using the control volume method, and the resulting system of algebraic equations is solved by the SIP algorithm utilizing the SIMPLE method for the pressure-velocity coupling. Initially, the laminar flow regime is analyzed, followed by turbulent flow simulations, utilizing both Low and High Reynolds turbulence models. Three different baffles heights were chosen for laminar and turbulent flow, aiming for further comparisons to literature data. Derivations are carried out under the recently established double-decomposition concept. Results show good qualitative agreement with literature data, for both laminar and turbulent cases, and good quantitative agreement with literature data, for laminar and some turbulent results.

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Книги з теми "Material of the baffle"

Thorn, Willard F. IBSS low light level television baffle design. Hanscom AFB, Mass: Air Force Research Laboratory, Space Vehicles Directorate, 1998.

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Eye twisters: Boggle, baffle and blow your mind! London: Carlton Kids, 2013.

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Eye twisters: Boggle, baffle and blow your mind! Markham, ON: Scholasitc, Inc., 2014.

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Randle, McKay, ed. The baffle book strikes again: Fifteen devilishly difficult detective puzzles. Boston: David R. Godine, Publisher, 2008.

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Ketukangan: Kesadaran material = Craftsmanship : material conciousness. Jakarta, Indonesia: PT Imaji Media Pustaka, 2014.

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The everything magic book: Everything you need to amaze, baffle, and entertain your friends. Holbrook, Mass: Adams Media Corp., 2000.

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Quirós, J. Ma Muñoz. Material reservado. Madrid: Visor, 2000.

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Authority, Severn-Trent Water. [Publicity material]. Birmingham: the Authority, 1987.

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Josep Maria Benet i Jornet. Material d'enderroc. Barcelona: Edicions 62, 2010.

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Tanenbaum, Robert. Material witness. New York: Signet, 1993.

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Частини книг з теми "Material of the baffle"

Banyay, Gregory A., Matthew H. Kelley, Joshua K. McKinley, Matthew J. Palamara, Scott E. Sidener, and Clarence L. Worrell. "Predictive Modeling of Baffle-Former Bolt Failures in Pressurized Water Reactors." In The Minerals, Metals & Materials Series, 357–72. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-68454-3_29.

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Banyay, Gregory A., Matthew H. Kelley, Joshua K. McKinley, Matthew J. Palamara, Scott E. Sidener, and Clarence L. Worrell. "Predictive Modeling of Baffle-Former Bolt Failures in Pressurized Water Reactors." In The Minerals, Metals & Materials Series, 1573–88. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-030-04639-2_105.

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Breslavsky, Dmytro, Alyona Senko, Oksana Tatarinova, Victor Voevodin, and Alexander Kalchenko. "Stress–Strain State of Nuclear Reactor Core Baffle Under the Action of Thermal and Irradiation Fields." In Advanced Structured Materials, 279–93. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-75890-5_16.

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Gooch, Jan W. "Baffle." In Encyclopedic Dictionary of Polymers, 62. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_985.

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Michalička, Jan, Zhijie Jiao, and Gary Was. "Radiation-Induced Precipitates in a Self-ion Irradiated Cold-Worked 316 Austenitic Stainless Steel Used for PWR Baffle-Bolts." In The Minerals, Metals & Materials Series, 565–80. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-030-04639-2_36.

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Hager, Willi H. "Baffle Blocks." In Energy Dissipators and Hydraulic Jump, 129–44. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-015-8048-9_8.

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Davidsaver, Sarah, Stephen Fyfitch, Brian Friend, and James Hyres. "Wear of Zircaloy-4 Grid Straps Due to Fretting and Periodic Impacting with RV Internals Baffle Plates." In 15th International Conference on Environmental Degradation of Materials in Nuclear Power Systems-Water Reactors, 703–15. Hoboken, New Jersey, Canada: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118456835.ch74.

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Davidsaver, Sarah, Stephen Fyfitch, Brian Friend, and James Hyres. "Wear of Zircaloy-4 Grid Straps Due to Fretting and Periodic Impacting with RV Internals Baffle Plates." In Proceedings of the 15th International Conference on Environmental Degradation of Materials in Nuclear Power Systems — Water Reactors, 703–18. Cham: Springer International Publishing, 2011. http://dx.doi.org/10.1007/978-3-319-48760-1_45.

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Yonezawa, T., T. Iwamura, K. Fujimoto, and K. Ajiki. "Optimized Chemical Composition and Heat Treatment Conditions of 316 CW and High-Chromium Austenitic Stainless Steels for PWR Baffle Former Bolts." In Ninth International Symposium on Environmental Degradation of Materials in Nuclear Power Systems-Water Reactors, 1015–26. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118787618.ch106.

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Тези доповідей конференцій з теми "Material of the baffle"

Seals, Roland D. "Advanced broadband baffle materials." In Orlando '91, Orlando, FL, edited by Max J. Riedl, Robert R. Hale, and Thomas B. Parsonage. SPIE, 1991. http://dx.doi.org/10.1117/12.46525.

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Otto, David J., and John L. Hanley. "From Art to Science: A New Acoustic Baffle Material." In SAE Noise and Vibration Conference and Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1995. http://dx.doi.org/10.4271/951245.

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Pe´niguel, Christophe, Isabelle Rupp, Nathalie Ligneau, Michel Tommy-Martin, Laurent Beloeil, and Emmanuel Lemaire. "Thermal Analysis of a PWR Core Internal Baffle Structure." In ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/pvp2006-icpvt-11-93299.

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Анотація:

The internal core baffle structure of a PWR consists in baffles and formers attached to the barrel. Each baffle being independent, the connection between the core baffle sheets, the formers and the core barrel is done thanks to a large number of bolts (about 1500). After inspection, some baffle bolts have been found cracked. This behaviour is attributed to Irradiation Assisted Stress Corrosion Cracking (IASCC). In order to compute accurately the temperature distribution affecting these bolts, EDF has set up a research program. Due to symmetry reasons, only a 45° sector has been accounted for. The three-dimensionnal neutron flux and the gamma induced internal heating are calculated with a Monte-Carlo particle transport code named Tripoli-4. The by-pass flow inside the cavities is computed with the CFD code Code_Saturne with a finite volume technique. Finally, the temperature distribution inside the structure (including all bolts which leads to a considerable solid mesh size — about 236 millions tetraedra) is computed by the thermal code Syrthes using a finite element approach, taking into account both the heating due to the gamma heating deposit and the cooling by the by-pass flow. Calculations show that the solid thermal field obtained exhibit strong temperature gradients and high temperature levels but in very limited zones located inside the material. As expected mainly very limited regions located inside the material and near the corner close to the reactor center are exposed to high temperature levels. On the other hand, calculations clearly confirm that external bolts thightening the core barrel and the formers see temperature much lower than those thightening the baffles.

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WoIlam, John S., and Brian W. Murray. "Space-Durable Beryllium Baffle Materials." In SPIE 1989 Technical Symposium on Aerospace Sensing, edited by Robert R. Hale. SPIE, 1989. http://dx.doi.org/10.1117/12.960950.

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Lompado, A., B. W. Murray, J. S. Wollam, and J. F. Meroth. "Characterization Of Optical Baffle Materials." In 33rd Annual Techincal Symposium, edited by John C. Stover. SPIE, 1990. http://dx.doi.org/10.1117/12.962851.

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Seals, Roland D., Charles M. Egert, and David D. Allred. "Advanced infrared optically black baffle materials." In San Diego, '91, San Diego, CA, edited by Solomon Musikant. SPIE, 1991. http://dx.doi.org/10.1117/12.22638.

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Murray, Brian W., Dennis R. Floyd, and Eric Ulph, Sr. "Light-absorbing, lightweight beryllium baffle materials." In Orlando '91, Orlando, FL, edited by Max J. Riedl, Robert R. Hale, and Thomas B. Parsonage. SPIE, 1991. http://dx.doi.org/10.1117/12.46526.

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Gupta, Anupam K., Yanqing Fu, Dane Webster, and Rolf Müller. "Bat Noseleaves as an Inspiration for Smart Emission Baffle Structures." In ASME 2013 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/smasis2013-3120.

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Baffle shapes are commonly used in engineered devices to interface sound sources with the free field. Examples are acoustic horns seen in megaphones and horn-loaded loudspeakers. Typical for these devices are simple, static shapes that serve primarily an impedance-matching function. Diffracting baffles linked to a sound source are also common in the biosonar system of bats. In particular in bat groups that emit their ultrasonic pulses nasally, the nostrils are always surrounded by some baffle shape. This is the case across several large and diverse bat families such as horseshoe bats (Rhinolophidae), Old World leaf-nosed bats (Hipposideridae), and New World leaf-nosed bats (Phyllostomidae). However, biosonar baffles differ from their technical counterparts in two important ways: They typically have a much greater geometrical complexity and they are capable of non-rigid shape changes over time. Although simple horn shapes can be found in the noseleaves of many bat species, they are rarely as plain and regular as in megaphones and other technical applications of acoustical horns. Instead, the baffles are broken up into several parts that are frequently augmented with intricate local shape features such as ridges, furrows, and spikes. Furthermore, we have observed that in species belonging to the horseshoe bats and the related Old World leaf-nosed bats these local shape features are often not static, but can undergo displacements as well as non-rigid deformations. At least some of these dynamic effects are not passive byproducts of e.g., sound production or exhalation, but due to specific muscular actuation that can be controlled by the animals. To study these intricate, dynamic baffles as inspirations for smart structures, we have recreated the degrees of freedoms that Old World leaf-nosed bats have in deforming their noseleaves in a digital model using computer animation techniques. In its current form, our model has 6 degrees of freedom that can be used to test interactions between different motions using actuation patterns that occur in life as well as patterns that have not been observed, but could aid understanding. Because of the high-dimensional parameter space spanned by the different degrees of freedom, a high-performance computing platform has been used to characterize the acoustic behavior across a larger number of deformed no seleaf shapes. A physical test bed is currently under construction for implementing baffle motions that have been found to result in interesting changes of the acoustic device characteristics and could hence be of use to engineering applications.

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Egert, Charles M., and J. A. Basford. "Vacuum outgassing from diffuse-absorptive baffle materials." In San Diego, '91, San Diego, CA, edited by Solomon Musikant. SPIE, 1991. http://dx.doi.org/10.1117/12.22639.

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Putra, Juno Dwi, Arif Rahman, Deendarlianto, Nining Betawati Prihantini, and Nasruddin. "The effect of modification photobioreactor bubble columns by using horizontal baffle on bubble velocity for microalgae." In INTERNATIONAL CONFERENCE ON TRENDS IN MATERIAL SCIENCE AND INVENTIVE MATERIALS: ICTMIM 2020. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0021325.

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Звіти організацій з теми "Material of the baffle"

Huppi, E. Ray, and Roy A. Austin. Advanced Retroreflective Telescope Baffle. Fort Belvoir, VA: Defense Technical Information Center, May 1993. http://dx.doi.org/10.21236/ada336096.

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Thorn, Willard F. IBSS Low Light Level Television Baffle Design. Fort Belvoir, VA: Defense Technical Information Center, December 1998. http://dx.doi.org/10.21236/ada382464.

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Dredge, L. A. Surficial materials, central Baffin Island, Nunavut. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2002. http://dx.doi.org/10.4095/213197.

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Leonard, Keith J., Mikhail A. Sokolov, and Maxim N. Gussev. Post-Service Examination of PWR Baffle Bolts, Part I. Examination and Test Plan. Office of Scientific and Technical Information (OSTI), April 2015. http://dx.doi.org/10.2172/1210147.

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Chen, Xiang (Frank), Tianyi Chen, Chad M. Parish, Tim Graening, Mikhail A. Sokolov, and Keith J. Leonard. Post-Irradiation Examination of High Fluence Baffle-Former Bolts Retrieved from a Westinghouse Two-Loop Downflow Type PWR. Office of Scientific and Technical Information (OSTI), July 2019. http://dx.doi.org/10.2172/1557483.

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Minchin, Carol. Material Origins. Portland State University Library, January 2000. http://dx.doi.org/10.15760/etd.7040.

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Chen, Xiang, and Mikhail Sokolov. Fracture Toughness and Fatigue Crack Growth Rate Testing of Baffle-Former Bolts Harvested from a Westinghouse Two-Loop Downflow Type PWR. Office of Scientific and Technical Information (OSTI), September 2021. http://dx.doi.org/10.2172/1829200.

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Bradley, Paul A. Material for Point Design (final summary of DIME material). Office of Scientific and Technical Information (OSTI), February 2014. http://dx.doi.org/10.2172/1121302.

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Geist, William H. Nuclear Material Measurement Contribution to the Material Balance Evaluation. Office of Scientific and Technical Information (OSTI), September 2017. http://dx.doi.org/10.2172/1394939.

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Zhang, Duan Z. Dual Domain Material Point Method for Extreme Material Deformation. Office of Scientific and Technical Information (OSTI), October 2013. http://dx.doi.org/10.2172/1095842.

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