Experimental Study of CD Variation With Aspect Ratio

This paper presents a combined experimental and numerical study of free vibration of industry-driven woven fiber glass/epoxy (G/E) composite plates with delamination. Using the first-order shear deformation theory, an eight-noded two-dimensional quadratic isoparametric element was developed, which has five degrees of freedom per node. In the experimental study, the influence of various parameters such as the delamination size, boundary conditions, fiber orientations, number of layers, and aspect ratio on the natural frequencies of delaminated composite plates are investigated. Comparison of the numerical results with experimental ones shows good agreement. Fundamental natural frequencies are found to decrease with the increase in the delamination size and fiber orientation and increases with the increase in the number of layers and aspect ratio of delaminated composite plates. The natural frequency of the delaminated composite plate varies significantly for different boundary conditions.

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Yacht Keels - An Experimental Study

10.5957/csys-1975-008 ◽

1975 ◽

Author(s):

Pierre DeSaix

Keyword(s):

Experimental Study ◽

Aspect Ratio ◽

Center Of Gravity ◽

Full Scale ◽

Optimum Size ◽

Hull Form ◽

Size And Shape ◽

Aspect Ratios ◽

Current Design ◽

Lateral Area

Model tests are presented for a series of nine keels; three aspect ratios, three sweep angles; all at constant lateral area, taper ratio and thickness ratio. The series is shown to bracket current design trends. These keels are all tested on the same canoe body, over a range of heel angles, lee-ways, and speeds. The results are presented in terms of full-scale sailing performance with due allowance for a reasonable ballast ratio and resulting vertical center of gravity for each keel. Optimum sweep angles for each aspect ratio are found. A second series of three keels, geometrically similar but varying in lateral area, is provided. Predictions of windward performance demonstrate the effect of keel size. An optimum size is found for three wind strengths. The results are for one hull form only. However, a method is suggested for estimating the effect of keel size and shape for any proposed design.

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A Theoretical and Experimental Study on the Planform of Superventilated Wings

Journal of Ship Research ◽

10.5957/jsr.1974.18.3.169 ◽

1974 ◽

Vol 18 (03) ◽

pp. 169-184

Author(s):

L. F. Tsen ◽

M. Guilbaud

Keyword(s):

Experimental Study ◽

Aspect Ratio ◽

Numerical Method ◽

Lower Surface ◽

Cavitation Number ◽

Water Tunnel ◽

Surface Theory ◽

Lifting Surface ◽

Measured Force

This study explores the influence of the aspect ratio, the taper ratio, and the sweepback on the flow over trapezoidal superventilated wings with a flat wetted lower surface. The flow is first calculated by a numerical method in the scope of the linearized supercavitating lifting-surface theory. The calculated wings are then made and tested in a water tunnel at zero cavitation number. The measured force and moment coefficients are compared with the prediction.

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An Experimental Study of Convective Heat Transfer in Radially Rotating Rectangular Ducts

Journal of Heat Transfer ◽

10.1115/1.2910608 ◽

1991 ◽

Vol 113 (3) ◽

pp. 604-611 ◽

Cited By ~ 49

Author(s):

C. Y. Soong ◽

S. T. Lin ◽

G. J. Hwang

Keyword(s):

Heat Transfer ◽

Experimental Study ◽

Reynolds Number ◽

Aspect Ratio ◽

Convective Heat Transfer ◽

Convective Heat ◽

Rotational Speed ◽

Main Flow ◽

Buoyancy Flow ◽

Aspect Ratios

The paper presents an experimental study of convective heat transfer in radially rotating isothermal rectangular ducts with various height and width aspect ratios. The convective heat transfer is affected by secondary flows resulting from Coriolis force and the buoyancy flow, which is in turn due to the centrifugal force in the duct. The growth and strength of the secondary flow depend on the rotational Reynolds number; the effect of the buoyancy flow is characterized by the rotational Rayleigh number. The aspect ratio of the duct may affect the secondary flow and the buoyancy flow, and therefore is also a critical parameter in the heat transfer mechanism. In the present work the effects of the main flow, the rotational speed, and the aspect ratio γ on heat transfer are subjects of major interest. Ducts of aspect ratios γ=5, 2, 1, 0.5, and 0.2 at rotational speed up to 3000 rpm are studied. The main flow Reynolds number ranges from 700 to 20,000 to cover the laminar, transitional, and turbulent flow regimes in the duct flow. Test data and discussion are presented.

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The otter board as a low-aspect-ratio wing at high angles of attack; an experimental study

Fisheries Research ◽

10.1016/0165-7836(86)90037-8 ◽

1986 ◽

Vol 4 (2) ◽

pp. 111-130 ◽

Cited By ~ 13

Author(s):

R.N. Patterson ◽

K.C. Watts

Keyword(s):

Experimental Study ◽

Aspect Ratio ◽

Low Aspect Ratio ◽

High Angles Of Attack

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Experimental study of an elliptical-core photonic bandgap fiber with thin core wall and high aspect ratio and its birefringence characteristics

Applied Physics B ◽

10.1007/s00340-010-4236-y ◽

2010 ◽

Vol 101 (3) ◽

pp. 583-586 ◽

Cited By ~ 1

Author(s):

G. Kim ◽

K. Hwang ◽

K. Lee ◽

K. S. Lee ◽

Y.-G. Han ◽

...

Keyword(s):

Experimental Study ◽

Aspect Ratio ◽

High Aspect Ratio ◽

Photonic Bandgap ◽

Photonic Bandgap Fiber ◽

Elliptical Core

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Experimental study of supersonic turbulent corner flow evolution in a low aspect ratio rectangular channel

53rd AIAA Aerospace Sciences Meeting ◽

10.2514/6.2015-0542 ◽

2015 ◽

Cited By ~ 6

Author(s):

Rohan R. Morajkar ◽

James F. Driscoll ◽

Mirko Gamba

Keyword(s):

Experimental Study ◽

Aspect Ratio ◽

Rectangular Channel ◽

Low Aspect Ratio ◽

Corner Flow ◽

Flow Evolution

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Out-of-plane behavior of confined masonry walls with aspect ratios greater than one

Canadian Journal of Civil Engineering ◽

10.1139/cjce-2019-0453 ◽

2021 ◽

Vol 48 (1) ◽

pp. 89-97

Author(s):

Jorge Varela-Rivera ◽

Joel Moreno-Herrera ◽

Luis Fernandez-Baqueiro ◽

Juan Cacep-Rodriguez ◽

Cesar Freyre-Pinto

Keyword(s):

Experimental Study ◽

Aspect Ratio ◽

Compressive Stress ◽

Masonry Walls ◽

Confined Masonry ◽

Aspect Ratios ◽

Out Of Plane ◽

Axial Compressive Stress ◽

Compressive Strut ◽

Failure Line

An experimental study on the out-of-plane behavior of confined masonry walls is presented. Four confined walls with aspect ratios greater than one were tested in the laboratory. Walls were subjected to combined axial and out-of-plane uniform loads. The variables studied were the aspect ratio and the axial compressive stress of walls. It was observed that the out-of-plane strength of walls increased as the aspect ratio or the axial compressive stress increased. Failure of walls was associated with crushing of masonry. Analytical out-of-plane strength of walls was determined using the yielding line, failure line, modified yielding line, compressive strut and bidirectional strut methods. It was concluded that the experimental out-of-plane strength of walls was best predicted with the bidirectional strut method.

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