Gotowe bibliografie tematyczne / Θ' plates

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Gotowa bibliografia na temat „Θ' plates”

Autor: Grafiati

Data publikacji: 6 września 2023

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Artykuły w czasopismach na temat "Θ' plates"

Ouinas, Djamel, i Belkacem Achour. "Buckling analysis of laminated composite plates [(θ/−θ)] containing an elliptical notch". Composites Part B: Engineering 55 (grudzień 2013): 575–79. http://dx.doi.org/10.1016/j.compositesb.2013.07.011.

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Hamani, N., D. Ouinas, N. Taghezout, M. Sahnoun i J. Viña. "Effect of Fiber Orientation on the Critical Buckling Load of Symmetric Composite Laminated Plates". Advanced Materials Research 629 (grudzień 2012): 95–99. http://dx.doi.org/10.4028/www.scientific.net/amr.629.95.

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In this study, a buckling analysis is performed on rectangular composite plates with single and double circular notch using the finite element method. Laminated plates of carbon/bismaleimde (IM7/5250-4) are ordered symmetrically as follows [(θ/-θ)2]S. The buckling strength of symmetric laminated plates subjected to uniaxial compression is highlighted as a function of the fibers orientations. The results show that whatever the notch radius, the buckling load is almost stable. Increasing the degree of anisotropy significantly improves critical buckling load.

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Wang, Q. W., W. Q. Tao, Z. Lin i T. T. Chow. "An Experimental Investigation of Natural Convection in a Cubic Inclined Enclosure With Multiple Isolated Plates". Journal of Heat Transfer 122, nr 1 (17.09.1999): 176–79. http://dx.doi.org/10.1115/1.521452.

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Natural convection in a cubic inclined enclosure with three isolated plates was investigated experimentally. The influences of the plates’ spacing, the inclination angles of the enclosure, and the Rayleigh number on the heat transfer of the plate group were obtained. It was found that under a fixed Rayleigh number, there is a plate spacing at which the heat transfer rate of the three plates is approximately the same for the horizontal plate group. Under the range of Rayleigh numbers considered, the heat transfer rate of the plate group is less than that of the natural convection of the plate group in infinite space. The heat transfer rate of the plates increases with the plate inclined angle tilting from θ=90 deg to θ=0 deg, with the most steep increase occurring in the range of θ=90 deg to 45 deg. A global correlation of the heat transfer results for all the inclination between 0 deg and 60 deg can be obtained as Nul,m=0.5360Ralcos θ0.25 with a spread of ±8.9 percent. [S0022-1481(00)00501-6]

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Hamani, N., Djamel Ouinas, N. Benderdouche i Mohamed Sahnoun. "Buckling Analyses of the Antisymetrical Composite Laminate Plate with a Crack from Circular Notch". Advanced Materials Research 365 (październik 2011): 56–61. http://dx.doi.org/10.4028/www.scientific.net/amr.365.56.

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In this study, an analysis of buckling was carried out on composite rectangular plates with and without circular notch by using the finite element method. The graphite/epoxy laminated plates were arranged antisymmetrically in the following ordered way [(θ/-θ)2]s. The buckling strength of the asymmetrical laminated plates subjected to uniaxial load is determined as a function of fiber orientation. The results show that whatever the notch radius, the buckling load is almost stable. The cumulated effect due to the presence of the longitudinal and transverse cracks as well as a circular notch reduces the buckling load considerably, which increases the risk of the fracture.

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Ono, Yuzo, i Nobuo Nishida. "Holographic zone plates for f · θ and collimating lenses". Applied Optics 25, nr 5 (1.03.1986): 794. http://dx.doi.org/10.1364/ao.25.000794.

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Fang, Xueqian, Chao Hu i Wenhu Huang. "Dynamic Stress Concentration of a Circular Cutout Buried in Semi-Infinite Plates Subjected to Flexural Waves". Journal of Applied Mechanics 74, nr 2 (4.02.2006): 382–87. http://dx.doi.org/10.1115/1.2198545.

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In this paper, based on the theory of elastic thin plates, applying the image method and the wave function expansion method, multiple scattering of elastic waves and dynamic stress concentration in semi-infinite plates with a circular cutout are investigated, and the general solutions of this problem are obtained. As an example, the numerical results of dynamic stress concentration factors are graphically presented and discussed. Numerical results show that the analytical results of scattered waves and dynamic stress in semi-infinite plates are different from those in infinite plates when the distance ratio b∕a is comparatively small. In the region of low frequency and long wavelength, the maximum dynamic stress concentration factors occur on the illuminated side of scattered body with θ=π, but not on the side of cutout with θ=π∕2. As the incidence frequency increases (the wavelength becomes short), the dynamic stress on the illuminated side of cutout becomes little, and the dynamic stress on the shadow side becomes great.

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Ould Hamouda, Sara, Nabil Kazi Tani i Tawfik Tamine. "Numerical buckling analysis of cracked Bi-material thin plates". Advances in Mechanical Engineering 12, nr 7 (lipiec 2020): 168781402094464. http://dx.doi.org/10.1177/1687814020944646.

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The aim of this present study is to analyze numerically the buckling behavior of cracked thin bi-material structures subjected to compression and tensile stresses and this, by considering the evolution of crack lengths and its orientations at the interface. This research work allows to quantify numerically the buckling phenomenon which can affects the thin plates for both cases, with and without interface crack especially, when the plate is subjected to tensile loading. The main important results of numerical simulations show that for the case of compression loading, the presence of interfacial crack increases significantly the strength of the thin plate against buckling phenomena. In the other hand, thin crack plates buckling is more pronounced when the crack tip is close to the interface (θ = 90°, θ = 75°). Finally, unlike to the case of homogeneous thin plates, the incorporation of bi-material aspect in thin plates design offers more strength against buckling either for compression or tensile loading.

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WU, W. X., C. SHU, C. M. WANG i Y. XIANG. "FREE VIBRATION AND BUCKLING ANALYSIS OF HIGHLY SKEWED PLATES BY LEAST SQUARES-BASED FINITE DIFFERENCE METHOD". International Journal of Structural Stability and Dynamics 10, nr 02 (czerwiec 2010): 225–52. http://dx.doi.org/10.1142/s021945541000349x.

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It is well-known that stress singularities occur at the obtuse corners of skew plates, especially when the skew angles are large. Owing to the stress singularities, accurate bending results, vibration frequencies and buckling loads of highly skewed plates are difficult to obtain accurately. In this paper, the mesh-free least squares-based finite difference (LSFD) method is proposed for solving the free vibration and buckling problems of highly skewed plates. As such vibration and buckling results are scarce in the open literature, the method was verified by comparing the LSFD solutions with existing ones having a skew angle θ ≤ 70°, or by carrying out convergence studies. The vibration and buckling results for plates with very large skew angle (θ = 80°) are presented for the first time. The close agreement observed in the comparison studies and the good convergence behavior of the LSFD solutions provide the confidence that these vibration and buckling results predicted by the LSFD method are of good accuracy.

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Oshima, Nagayasu, Y. Iwai, T. M. Kojima, Tokihiro Ikeda, Y. Kanazawa, M. Hoshino, Ryoichi Suzuki i Y. Yamazaki. "Guiding of a Slow Positron Beam with a Glass Capillary". Materials Science Forum 607 (listopad 2008): 263–65. http://dx.doi.org/10.4028/www.scientific.net/msf.607.263.

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Slow positron beam was injected into a non-tapered glass capillary which was tilted angle of θ from the beam axis by a movable stage. Beam profiles of the positrons transported through the capillary were observed with a phosphor screen combined with micro channel plates as a function of θ. Some fraction of positrons was deflected with the tilting angle of the capillary.

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Kostopoulos, V., i D. Th Korontzis. "Damping Characteristics of Vibrated Composite Plates". Advanced Composites Letters 9, nr 6 (listopad 2000): 096369350000900. http://dx.doi.org/10.1177/096369350000900604.

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The free vibration response of [±Θ] ns orthogonal, simply supported (all around) composite laminated plates was studied, assuming linear viscoelastic behaviour of the constitutive lamina material. The problem was solved numerically and the results were verified in the special case of [0]2 n laminate against the analytical solution, which is also provided. Stability and convergence problems were discussed analytically. Eigenfrequency values and modal damping characteristics were calculated for the first nine mode shapes. Furthermore, keeping constant the plate thickness, the effect of the lamina thickness on the vibration characteristics of the plate was examined.

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Części książek na temat "Θ' plates"

Renard, Nicolas, Sébastien Deck i Pierre Sagaut. "Spectral Assessment of the Turbulent Convection Velocity in a Spatially Developing Flat Plate Turbulent Boundary Layer at Reynolds Number $$Re_\theta = 13\,000$$ R e θ = 13 000". W Progress in Wall Turbulence 2, 379–89. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-20388-1_33.

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Chemin, Jean-Yves, Benoit Desjardins, Isabelle Gallagher i Emmanuel Grenier. "Other Layers". W Mathematical Geophysics. Oxford University Press, 2006. http://dx.doi.org/10.1093/oso/9780198571339.003.0019.

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Note that Ω=Ω×[0, 1] is a particular case where the boundary layers are purely horizontal or purely vertical. In the general case of an open domain Ω, the boundaries have various orientations. As long as the tangential plane ∂Ω is not vertical, the boundary layers are of Ekman type, with a size of order where ν is the normal of the tangential plane. When ν.r→0, namely when the tangential plane becomes vertical, Ekman layers become larger and larger, and degenerate for ν.r=0 in another type of boundary layer, called equatorial degeneracy of the Ekman layer. We will now detail this phenomenon in the particular case of a rotating sphere. Mathematically, almost everything is widely open! Let Ω=B(0,R) be a ball. Let θ be the latitude in spherical coordinates. The equatorial degeneracy of the Ekman layer is difficult to study. We will just give the conclusions of the analytical studies of. The Ekman layer is a good approximation of the boundary layer as long as |θ|≫E1/5. For |θ|≪E1/5 the Ekman layer degenerates into a layer of size E2/5. • for |θ|≫(εν)1/5, Ekman layer of size • for |θ| of order (εν)1/5, degeneracy of the Ekman layer into a layer of size (εν)1/5 in depth and (εν)2/5 in latitude. Let us now concentrate on the motion between two concentric rotating spheres, the speed of rotation of the spheres being the same. In this case, Ω=B(0,R) − B(0, r) where 0<r<R. Keeping in mind meteorology, the interesting case arises when R − r ≪ R: the two spheres have almost equal radius. Let us study the fluid at some latitude θ. If θ ≠0, locally, the space between the two spheres can be considered as flat and treated as a domain between two nearby plates. The conclusions of the previous paragraphs can be applied. Two Ekman layers are created, one near the inner sphere and the other one near the outer sphere.

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Krishnan, Kannan M. "X-Ray Diffraction". W Principles of Materials Characterization and Metrology, 408–80. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780198830252.003.0007.

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X-rays diffraction is fundamental to understanding the structure and crystallography of biological, geological, or technological materials. X-rays scatter predominantly by the electrons in solids, and have an elastic (coherent, Thompson) and an inelastic (incoherent, Compton) component. The atomic scattering factor is largest (= Z) for forward scattering, and decreases with increasing scattering angle and decreasing wavelength. The amplitude of the diffracted wave is the structure factor, F _hkl, and its square gives the intensity. In practice, intensities are modified by temperature (Debye-Waller), absorption, Lorentz-polarization, and the multiplicity of the lattice planes involved in diffraction. Diffraction patterns reflect the symmetry (point group) of the crystal; however, they are centrosymmetric (Friedel law) even if the crystal is not. Systematic absences of reflections in diffraction result from glide planes and screw axes. In polycrystalline materials, the diffracted beam is affected by the lattice strain or grain size (Scherrer equation). Diffraction conditions (Bragg Law) for a given lattice spacing can be satisfied by varying θ or λ — for study of single crystals θ is fixed and λ is varied (Laue), or λ is fixed and θ varied to study powders (Debye-Scherrer), polycrystalline materials (diffractometry), and thin films (reflectivity). X-ray diffraction is widely applied.

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Li, Xuemin, Donglin Li i Juncheng Guo. "Study on the Detection of Defects in Steel Plate Welds with θ Eddy Current Probe". W Advances in Transdisciplinary Engineering. IOS Press, 2022. http://dx.doi.org/10.3233/atde220456.

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The evaluation of weld defects plays an important role in ensuring the safety of equipment, but due to the unevenness of the weld itself, the use of conventional eddy current probes to detect weld defects can be affected by the lifting effect, so this paper introduces a new type of θ eddy current probe for the evaluation of steel plate weld defects. Firstly, using COMSOL simulation software, a model of the probe and the steel plate weld is constructed, and the effect of changes in excitation coil height and thickness as well as detection coil height and thickness on the detection sensitivity of the probe is fully investigated, and the optimum probe size is calculated by combining the results of simulation and optimisation analysis. Finally, the experimental platform is built and the test results show that the new θ eddy current probe has a good suppression effect on the lifting effect caused by the different width and depth of the weld seam and the lifting effect caused by the unevenness of the surface of the weld seam.

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Warrick, Arthur W. "One-Dimensional Absorption". W Soil Water Dynamics. Oxford University Press, 2003. http://dx.doi.org/10.1093/oso/9780195126051.003.0009.

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In this chapter we address one-dimensional absorption. Absorption denotes movement of water (or other liquid) into a soil under the influence of capillarity without the effects of gravity. Although important for horizontal flow conditions, there is more interest in the results and principles relevant to the early stage of infiltration and in general relationships descriptive of the physical principles for all unsaturated systems. At the outset, two simplified systems will be considered. Included is the classical problem of linear diffusion into a semi-infinite domain. Then the Boltzmann similarity transform will be applied, confirming results from the simplified solutions and leading to methods for finding soil-water diffusivity and Philip’s quasi-analytical solution. Finally, simultaneous water flow will be considered as a two-phase process. Figure 4-1 shows water introduced into a horizontal column of soil at a matric potential hwet. The value of hwet is maintained as zero or negative by the “mariotte” device to the left. The initial condition is that the matric potential is hdry with hdry < hwet ≤ 0. A porous plate at x = 0 allows water to come into the system but prevents air from flowing from the soil back into the water supply. The right-hand end allows air to freely escape the system as the water displaces the air. Vertical movement in the soil column is ignored. We make key simplifying assumptions that the conductivity is a constant K = Kwet in the wet part of the column and K = 0 for the dry part. Furthermore, we assume a sharp division between the wet and dry part at xf. On the supply side of the column (0 < x < xf), the water content is a constant (θ = θwet) and, to the dry side, the initial value is maintained (θ = θdry). These are equivalent to the “Green–Ampt” assumptions used in chapter 5, when gravity will be included as a driving force.

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Khushaim, Muna. "Precipitation in AA2195 by Atom Probe Tomography and Transmission Electron Microscopy". W Encyclopedia of Aluminum and Its Alloys. Boca Raton: CRC Press, 2019. http://dx.doi.org/10.1201/9781351045636-140000220.

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The transportation industries are constantly striving to achieve minimum weight to cut fuel consumption and improve overall performance. Different innovative design strategies have been placed and directed toward weight saving combined with good mechanical behavior. Among different materials, aluminum-based alloys play a key role in modern engineering and are widely used in construction components because of their lightweight and superior mechanical properties. Introduction of different nanostructure features can improve the service and the physical properties of such alloys. In this study, alloy AA2195 has been selected and characterized by means of transmission electron microscopy and atom probe tomography. Quantitative chemical analyses reveal that applying the rolling deformation on the specimen causes the uniform distribution of different platelet precipitates such as T1(Al2CuLi) and θ′(Al2Cu), which increases the hardening behavior of such alloys. Applying a plastic deformation on such alloys has been highlighted as an important engineering tool for the manipulation with second-phase precipitates in the microstructure. In this study, the findings of the characterization analysis were translated to construct a robust microstructure with an excellent hardness behavior (hardness value of 209 HV) by applying a low-energy consumption, cost-effective method.

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"FIG. 15 System energy change with (a) the apparent contact angle θ and (b) non-dimensional meniscus radius when axisymmetric meniscus forms under a horizontal plate. The system is stable between states A and B." W Surface and Interfacial Tension, 406–7. CRC Press, 2004. http://dx.doi.org/10.1201/9780203021262-120.

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Streszczenia konferencji na temat "Θ' plates"

Yin, Jixiang, Guojun Li i Zhenping Feng. "Effects of Corrugation Angle on Flow and Heat Transfer in Cross Corrugation Channels With Sinusoidal Waves". W ASME Turbo Expo 2005: Power for Land, Sea, and Air. ASMEDC, 2005. http://dx.doi.org/10.1115/gt2005-68282.

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Fluid field and heat transfer in a cross-corrugated (CC) geometry with sinusoidal wavy plates have been investigated with laminar flow assumption. The 7 × 7 multiple channels configuration with six different corrugation intersection angles θ are studied. For air mass flow rates in the range of 50 ≤ Re ≤ 2000 and P/Hi = 2.2, average Nu and Fanning friction factor f are analyzed. Numerical results show that Fanning friction factors increase with corrugation intersection angle θ. But the Re of transition to turbulence decreases when θ > 90°. Moreover, the absence of a sharp transition is demonstrated for θ ≤ 90°. The distribution of local Nu becomes slightly flatter along the width when θ increases. The maximal Nu locates near the main flow trailing position and at the entrances of the neighborhood outflows, the minimum Nu locates at the contact points of top plate and bottom plate. Average Nu shows different variety with various ranges of corrugation intersection angle θ and Re, the maximum average Nu is obtained with 120° plate. Predictive correlations of f and Nu with Re have been carried out base on the numerical results. The sinusoidal wavy plates have a Nu which is about 6.5 times higher than that of a parallel-plate channel. And the concomitant f is about 54 times higher than that of the sinusoidal wavy plates. At last, the comprehensive assessment of the surfaces performance shows that the 30° plate surface has the optimal performance, while the one with 150° angle has the worst performance.

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Sulaiman, Altaf H., Jim Y. C. Yang i Shaik Jeelani. "Stress and Stability Analyses of Thick Fiber Reinforced Laminated Composite Plates Using Finite Element Method". W ASME 1993 International Computers in Engineering Conference and Exposition. American Society of Mechanical Engineers, 1993. http://dx.doi.org/10.1115/cie1993-0059.

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Abstract The Finite Element work consists of Stress Concentration at the edge of circular cutout of a fiber reinforced laminated plate and Stability analysis of the same model. Location and magnitude of the maximum circumferential stress have been investigated with a finite element analysis program, ABAQUS. Variations of fiber orientation and ratio of in-plane biaxial loading have been considered to study the behavior of angle ply laminated plates. Postbucking response for angle ply laminated plate [θ/−θ]2s for both thin and thick section is studied. Different hole sizes, loading ratios, geometric imperfection in the z-direction and fiber orientations have been used in this analysis. The influence of these parameters on the postbuckling response is presented in this paper.

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Arslan, Nurettin, Aydın Turgut i Erol Sancaktar. "Elasto-Plastic Finite Element Stress Analysis of Thermoplastic-Matrix Symmetric Cross-Ply Plates With Square Hole". W ASME 2000 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/imece2000-2456.

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Abstract In this study, elasto-plastic stress analysis of symmetric cross-ply reinforced thermoplastic (PVC) matrix composite laminated plates with square hole is presented. A two-dimensional computer program is developed for elasto-plastic stress analysis of laminated plates by FEM. The thermoplastic matrix is reinforced using long stainless steel fibers. The composite plates are manufactured by using molds under the action of 2 MPa pressure, and heating up to 200 °C. The laminated plate with square hole consists of four reinforced layers bonded symmetrically in ([θ/-θ]2) cross-ply configuration. A first–order shear deformation theory, and nine node Lagrangian finite element method are used in analysis. The applied in-plane load, and the layer orientation angle are varied to obtain the corresponding variation of residual stresses, and the expansions of plastic regions for various cases.

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Zhuang, Songlin, Yue Zhang i Yanping Huang. "New method for measuring phase factor". W OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1988. http://dx.doi.org/10.1364/oam.1988.fo2.

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We propose a new optical method for determining the optical phase term from the intensity distribution. The basic idea of the new method is as follows: Consider a simple Fourier optical setup or 4f system. An object f(x) = |f(x)| exp [jθ(x)] is put in the object plane, and the detector is inserted in the image plane. Obviously the intensity distribution I(x′) determined here does not include any phase information. However, if we use a spatial filter to modulate the spectrum distribution of the object function, the new intensity I(x′) will be related not only to the amplitude term |f (x)| but also to the phase term θ(x). The relationship between I(x′) and θ(x) is also changed by using differential filters. Therefore, the phase factor θ (x) can be obtained from a series of intensity measurements. It can be shown that the phase term of the object function can be uniquely determined by using two different modulated plates.

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Rezaei, Amir Abbas, Masoud Ziabasharhagh, Tooraj Yousefi i Mehran Ahmadi. "Experimental Study of Free Convection Heat Transfer From a Fin Attached Cylinder Confined Between Tilt and Low Conductive Plates". W ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2010. http://dx.doi.org/10.1115/esda2010-24070.

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Steady state and two-dimensional natural convection heat transfer flow around a horizontal and isothermal cylinder with a longitudinal fin attached to it that is located between two tilt and very low conductive plates is studied experimentally by using a Mach-Zehnder interferometer. Effects of the plates slope angel (θ) on heat transfer from the tube is investigated for Rayleigh number ranging from 1000 to 15500. Experiments are done for a fin attached cylinder placed between two low conductive plates. Two different diameter tubes with diameters of D=10 and 20mm are utilized for broad Rayleigh number range. Results specify that, heat transfer experience differs for special Rayleigh numbers. For Rayleigh numbers ranging less than 5500, rate of heat transfer amount from the cylinder surface is less than that of a lone cylinder and it’s the result of no slip boundary condition on the fin surface. For this range of Rayleigh number by the use of plates, heat transfer from the cylinder surface decreases slightly and plates leaning does not alter heat transfer speed from the cylinder surface. For Rayleigh number ranging from 5500 to 15500, heat transfer rate from the cylinder surface is lower than the heat transfer rate from the surface of an individual cylinder. Though, by adding placing the low conductive plates as plates to experimental model, heat transfer system differs and chimney effect between fin and the plates increases the heat transfer from the cylinder surface. By increasing the plates slope angel from 0° to 20°, the chimney effect between plates and fin weakens and heat transfer rate from the tube surface is going to the amount of heat transfer rate from a fin attached cylinder which is not placed between plates.

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Scano, D. "Analysis of composite beams, plates, and shells using Jacobi polynomials and NDK models". W Aerospace Science and Engineering. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902677-22.

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Abstract. In this work, hierarchical Jacobi-based expansions are explored for the static analysis of multilayered beams, plates, and shells as structural theories as well as shape functions. Jacobi polynomials, denoted as P_p^((γ,θ) ), belong to the family of classical orthogonal polynomials and depend on two scalars parameters 𝛾 and 𝜃, with p being the polynomial order. Regarding the structural theories, layer wise and equivalent single-layer approaches can be used. It is demonstrated that the parameters 𝛾 and 𝜃 of the Jacobi polynomials are not influential for the calculations. These polynomials are employed in the framework of the Carrera Unified Formulation (CUF), which allows to generate of finite element stiffness matrices straightforwardly. Furthermore, Node-dependent Kinematics is used in the CUF framework to build global-local models to save computational costs and obtain reliable results simultaneously.

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Ominsky, Michael S., Philippe K. Zysset i Steven A. Goldstein. "Elastic Properties of 3D Cells for Trabecular Bone: Digital vs. Structural Finite Element Models". W ASME 1997 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/imece1997-0201.

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Abstract Characterizing morphological and elastic properties of trabecular bone is a critical step towards understanding bone fragility. Idealized 3D cells for trabecular bone based on a tetrakaidecahedral geometry have been previously described to study morphology and its relationship to mechanical properties [1,2]. Two types of cells have been proposed: an open cell consisting of rectangular beams and a closed cell with hexagonal plates [Fig. 1]. The morphology of the cell is quantified by measures of structural density (SD) and mean intercept length (MIL). Structural density is mainly controlled by the aspect ratio t/l (thickness/length) of the beams or plates. Mean intercept length is controlled by the angle θ, which changes the cell’s anisotropy.

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Fernandes, Antonio Carlos, Sina Mirzaei Sefat, Fabio Moreira Coelho i Mario Ribeiro. "Towards the Understanding of Manifold Fluttering During Pendulous Installation: Flow Induced Rotation of Flat Plates in Uniform Flow". W ASME 2010 29th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/omae2010-20950.

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The pendulous installation method of a manifold has a first phase that can be considered as a free fall in water. Of course, this is not free due to the fluid action. The consequence is that the manifold may oscillate rotationally which characterizes a fluttering behavior. However, the manifold is a complex body with non-uniform shape, several modules, porosity etc. Hence, in order to improve the understanding of the fluttering, this work presents advances in the observation of flow induced rotation on a flat plate in uniform flow. This has been started experimentally and subsequently numerical models yielded a confirmation of quasi-steady observations. The experimental results were obtained at the Laborato´rio de Ondas e Correntes (LOC) [Laboratory of Waves and Current] in COPPE/Federal University of Rio de Janeiro. The drag and lift forces coefficients and the center of pressure have been obtained for angles of attack θ = 0°–90° and for different Reynolds numbers.

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Bianco, Nicola, Oronzio Manca, Sergio Nardini i Vincenzo Naso. "Radiation Effects on Natural Convection in Air in a Divergent Channel With Uniformly Heated Plates". W ASME 2003 Heat Transfer Summer Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/ht2003-47135.

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Nowadays trends in natural convection heat transfer are oriented toward either the seeking of new configurations to enhance the heat transfer parameters or the optimization of standard configurations. An experimental investigation on air natural convection in divergent channels with uniform heat flux at both the principal walls is presented in this paper to analyze the effect of radiative heat transfer. Results in terms of wall temperature profiles as a function of the walls diverging angle, the interwall spacing, the heat flux are given for two value of the wall emissivity. Flow visualization is carried out in order to show the peculiar pattern of the flow between the plates in several configurations. Nusselt numbers are then evaluated and correlated to the Rayleigh number. The investigated Rayleigh number ranges from 7.0 × 102 to 4.5 × 108. The maximum wall temperature decreases at increasing divergence angles. This effect is more evident when the minimum channel spacing decrease. A significant decrease in the maximum wall temperature occurs passing from ε = 0.10 to ε = 0.90, except in the inlet region. Flow visualization shows a separation of the fluid flow for bmin = 40 mm and θ = 10°. Correlations between Nusselt and Rayleigh numbers show that data are better correlated when the maximum channel spacing is chosen as the characteristic length.

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Dong, Wei, Shengbao Zhang, Zhiqiang Guo i Xiao Yu. "Experimental Investigation on the Flow and Heat Transfer of an Air-Air Primary Surface Heat Exchanger". W ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/gt2018-75991.

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The primary surface heat exchanger (PSHE) is a kind of small size, light weight, high integration heat exchanger. The characteristics of the complex internal structure, complex flow pattern and the flow interaction have a great influence on the heat transfer of the air-air primary surface heat exchanger. Five cross-corrugated air-air primary surface heat exchangers with different core configurations are designed and fabricated applying additive manufacturing technology. The cross angle θ of upper and lower corrugated plates is 0°, 15°, 30°, 45°, respectively. An experimental investigation on the flow and heat transfer performance is carried out. The comparison of test results of overall heat transfer coefficient and the pressure drop for different primary heat exchangers is presented. The test results show that the pressure drop is significantly increased with the cross angle increasing, and the heat transfer performance does not show the linear increasing with the cross angle increasing.

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