2 edition of effect of roughness elements of the Magnus characteristics of rotating spherical projectiles. found in the catalog.
effect of roughness elements of the Magnus characteristics of rotating spherical projectiles.
Michael A. Smith
by Microform Publications, College of Human Development and Performance, University of Oregon in Eugene
Written in English
Thesis (M.S.) - North Texas State University, 1982.
|The Physical Object|
|Pagination||1 microfiche (93 fr) :|
|Number of Pages||93|
Heat And Mass Transfer (4th Edition) Edit edition. Problem 10P from Chapter 7: What is the effect of surface roughness On the friction drag Get solutions. Combined Effect of Slip Velocity and Surface Roughness on a Magnetic Squeeze Film for a Sphere in a Spherical Seat However, lower values of slipmay be preferred forenhancing the performance characteristics ofthe bearing system. Besides, variance (ve) provides a little support to improve the performance characteristics. between rotating Author: G. M. Deheri, Sejal J. Patel.
Atomic force microscopes (AFM) The atomic force microscope (AFM) measures the asperity of a sample using the atomic forces between the tip and the sample. To perform measurements, the user moves the cantilever, equipped with a sharp tip (probe) at its end, into proximity of a sample surface to a distance of several nanometers. measuring and analyzing aggregate characteristics are described. A Pencept Penpad digitizer accurate to in. together with an IBM-XT microcomputer was used to collect and analyze the necessary data for measuring aggregate shape, surface area, and roughness. Measured coordinates of critical points were stored in an Autocad DXF file.
Interfacial conditions such as friction and roughness substantially affect the process characteristics of metal forming. This study developed a dry friction model that accounted for the adhesion and interference effects of surface roughness. A sliding friction coefficient was suggested to provide fundamental information about the interfacial conditions of the contact by: The effect of flow on the structure of solidified alloys can be investigated by the unidirectional solidification of alloys stirred with a magnetic (magnetohydrodynamics – MHD) method. This MHD method is a rotating magnetic field (RMF)-type. The paper deals with the melt flow generated by this : Arnold Rónaföldi, Jenő Kovács, András Roósz.
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Get this from a library. The effect of roughness elements on the Magnus characteristics of rotating spherical projectiles. [Michael A Smith]. I need to find the effect of surface roughness on the Magnus force, and I cannot find a equation to describe the flow that has surface roughness in it.
So, it would he helpful if someone could provide the equation, and if possible the source of the information. Thanks. The Magnus effect has been studied on spherical projectiles such as golf balls, tennis balls, and soccer balls.
The backspin of a golf ball leads to Magnus lift that opposes gravity, thus allowing the ball to fly further. The dimples of a golf ball enhance the effect.
scale geometric roughness elements – in this case diamond protuberances. 1 Introduction th The high level of lifting force that can be generated by the Magnus effect, via a spinning cylinder in crossflow, has been the impetus for many studies into how this effect may File Size: 1MB.
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depends on characteristics of the roughness but has a constant value of in the fully rough regime. A widely used form of the f-factor, for fully rough flows, is given by Nikuradse .
The Magnus effect on a prototype model soccer ball rotating perpendicular to the flow direction at Reynolds numbers in the range of × 10 5 Cited by: the physical mechanisms underlying roughness-induced transition in a high-speed boundary layer.
The effect of an isolated, finite amplitude roughness element on a supersonic boundary layer is considered next. The other set of flow configurations examined herein corresponds to roughness based laminar flow control in subsonic and supersonic swept.
Movement of the start and the end of transition behind an isolated spherical roughness element under favorable pressure gradient, k = x m, xk m,),0k = + The roughness elements on a surface have two different ef- fects on the boundary layer downstream of the roughness ele- : Kahraman Albayrak, Ömer T Göksel.
This investigation analyzes the performance of a magnetic fluid based squeeze film for a sphere in a rough spherical seat with slip velocity. The slip model of Beavers and Joseph has been deployed to study the effect of velocity slip while the stochastic model of Christensen and Tonder has been used to calculate the effect of surface : G.
Deheri, Sejal J. Patel. The advantages of surface roughness effect on rotating cylinder have been stated by many researchers , .
Seifert  has clearly pointed out that surface roughness can further increase the performance of rotating cylinder based on his review papers on Magnus effect.
Moreover,File Size: KB. I know that the surface roughness plays an role in the Magnus force exerted of a rotating cylinder. But, i cannot find an equation that includes the surface roughness in the equation of the Magnus force.
If someone could state the formula (and preferably a source. However, the Magnus Effect has a significant effect on the stability of the bullet.
If the effect is significant enough, it will basically make the bullet wobble through the air until the cross sectional area of the bullet moving through the air is no longer aerodynamic.
A crosswind of 4 m/s (9 mph) or more can have a noticeable role in the. Effect of surface roughness on a magnetic squeeze film for a sphere in a spherical seat G.M. Deheri 1, S. Patel1*, between a non-rotating spherical surface and a hemispherical bearing under a steady load.
It effect of surface roughness on the couple stress squeeze film between a sphere and a flat plate. In order to investigate the e ect of surface roughness on the Magnus force, an apparatus needed to be con-structed where this force could be accurately measured.
Because the Magnus force is only present on spinning projectiles, this apparatus needed to consistently launch a spinning ball into constant atmospheric conditions, or to simulate that. Figure roughness comparison of two surfaces A and B Coming back to more concrete concepts, we can consider that shot peening will be efficient if shots strikes bottom of the defects, and if residual roughness is isotropic.
The eye + magnifying grass or microscope are good tools to evaluate this Size: KB. We used smaller projectiles ( mm diameter) than those ( mm diameter) in our previous studies and investigated the effect of the projectile scale on the stabilization of ODWs.
We carried out high time resolution schlieren visualization using a high-speed by: In some specific conditions, a flying spinning ball deflects in a direction opposite to that predicted by the Magnus effect, which is known as the inverse Magnus effect.
To elucidate when and why this effect occurs, we measure the variations of the drag and lift forces on a rotating sphere and the corresponding flow field with the spin ratio Cited by: I NASA TECHNICAL NOTE - NASA TN D c.a I._ EFFECT OF CONTROLLED SURFACE ROUGHNESS ON BOUNDARY-LAYER TRANSITION AND HEAT TRANSFER AT MACH NUMBERS OF AND by Paul F.
Holloway and James R. Stewett Langley Research Center Langley Station, Hampton, Va. NATIONAL AERONAUTICS AND SPACE ADMINISTRATION WASHINGTON, D.
File Size: 2MB. This thesis looks at the hydrodynamics of spherical projectiles impacting the free surface using a unique experimental WebLab facility. Experiments were performed to determine the force impact coefficients of spheres and then compare obtained results to theories developed by Von-Karman  and Wagner .
It was found that experimental results. any roughness plate on the flow channel and were repeated for channel slope equal to, and Experiments for rough surface were conducted with plate NO.1 and plate NO.2 respectively, each of the plate had its own value of roughness height, to study the .Roughness is studied by examining how textures are perceived and encoded by an individual's somatosensory system.
In an experiment to measure and compare the roughness of different sounds, listeners are presented with different sounds and asked to rate their roughness, for example on a rating research has displayed that there are two different codes, at least, for roughness: a.
I am doing a report on the effect of the surface roughness of a wing on the wing's performance. This was done by testing a a wing design in a wind tunnel using a smooth, intermediate and then rough surface. The test involved varying the pitch angle and tunnel power setting (velocity) for .