The electrohydrodynamic plume between a line source of ions and a flat plate-theory and experiment

1992 ◽  
Vol 27 (2) ◽  
pp. 334-341 ◽  
Author(s):  
F.M.J. McCluskey ◽  
A.T. Perez
Keyword(s):  
Flat Plate ◽  
Line Source ◽  
Plate Theory ◽  
Theory And Experiment

Flush probe studies of plasma flow over a flat plate: theory

1979 ◽  
Vol 12 (10) ◽  
pp. 1685-1697 ◽  
Author(s):  
C R Giles ◽  
R M Clements ◽  
P R Smy
Keyword(s):  
Flat Plate ◽  
Plasma Flow ◽  
Plate Theory

Correction: Natural Frequencies of a Heated Plate: Theory and Experiment

AIAA Journal ◽  
2021 ◽  
pp. 1-1
Author(s):  
Maxim Freydin ◽  
Dani Levin ◽  
Earl H. Dowell ◽  
Santosh Vaibhav Varigonda ◽  
Venkateswaran Narayanaswamy
Keyword(s):  
Natural Frequencies ◽  
Plate Theory ◽  
Heated Plate ◽  
Theory And Experiment

scholarly journals Realization of mutually unbiased bases for a qubit with only one wave plate: theory and experiment

2015 ◽  
Vol 23 (8) ◽  
pp. 10018 ◽  
Author(s):  
Zhibo Hou ◽  
Guoyong Xiang ◽  
Daoyi Dong ◽  
Chuan-Feng Li ◽  
Guang-Can Guo
Keyword(s):  
Plate Theory ◽  
Mutually Unbiased Bases ◽  
Wave Plate ◽  
Theory And Experiment

A Simple Theory for the Two-Dimensional Compressible Turbulent Boundary Layer

1972 ◽  
Vol 94 (3) ◽  
pp. 636-642 ◽  
Author(s):  
F. M. White ◽  
G. H. Christoph
Keyword(s):  
Boundary Layer ◽  
Turbulent Boundary Layer ◽  
Flat Plate ◽  
Skin Friction ◽  
Plate Theory ◽  
Momentum Equation ◽  
Shape Factors ◽  
Law Of The Wall ◽  
Compressible Turbulent Flow ◽  
New Equation

A new approach is proposed for analyzing the compressible turbulent boundary layer with arbitrary pressure gradient. Utilizing a compressible law-of-the-wall and a Crocco energy approximation, the new theory integrates the momentum equation across the boundary layer in terms of inner variables only. The result is a single first-order ordinary differential equation for skin friction, devoid of integral thicknesses and shape factors. When analyzed for flat plate flow, this new equation has an exact solution apparently superior in accuracy to any other flat plate theory (Table 1). The new equation also agrees well with supersonic skin friction data in both favorable and adverse pressure gradients. The new theory contains an explicit separation criterion and is the simplest and possibly most accurate existing analysis for compressible turbulent flow.

Three-dimensional boundary layers with short spanwise scales

2014 ◽  
Vol 756 ◽  
pp. 452-469 ◽  
Author(s):  
Richard E. Hewitt ◽  
Peter W. Duck
Keyword(s):  
Boundary Layer ◽  
Flat Plate ◽  
Boundary Layers ◽  
Line Source ◽  
Flow Direction ◽  
Three Dimensional ◽  
Computational Procedure ◽  
External Flow ◽  
Short Scale ◽  
Source Sink

AbstractWe investigate three-dimensional (laminar) boundary layers that include a spanwise scale comparable to the boundary-layer thickness. A forcing of short spanwise scales requires viscous dissipation to be retained in the two-dimensional cross-section, perpendicular to the external flow direction, and in this respect the flows are related to previous work on corner boundary layers. We use two examples to highlight the main features of this category of boundary layer: (i) a flat plate of narrow (spanwise) width, and (ii) a narrow (spanwise) gap cut into an otherwise infinite flat plate; in both cases the plate is aligned with a uniform oncoming stream. We find that a novel feature arises in connection with the external flow; the presence of a narrow gap/plate (or indeed any comparable short-scale feature of long streamwise extent) necessarily modifies the streamwise mass flux in that vicinity, which in turn induces an associated boundary-layer transpiration on the same short spanwise length scale. This (short-scale) transpiration region leads to a half-line-source/sink correction to the outer inviscid, irrotational flow. Crucially, the volumetric flux associated with this line-source/sink must be explicitly included as part of the computational procedure for the leading-order boundary layer, and as such there is a weak interaction between the outer (inviscid) flow and the boundary layer. This is a generic feature of boundary layers that are forced through the presence of short-scale spanwise variations.

Experimental Analysis of Rudder Contribution to Roll Damping

2008 ◽  
Author(s):  
Ali Etebari ◽  
Paisan Atsavapranee ◽  
Christopher Bassler ◽  
Jason Carneal
Keyword(s):  
Flat Plate ◽  
Plate Theory ◽  
Added Mass ◽  
Sine Wave ◽  
Plate Model ◽  
Flat Plates ◽  
Roll Damping ◽  
Clear Trend ◽  
Current Effort ◽  
Drag And Lift

Measuring and modeling the forces on the appendages of surface ships is important for understanding roll-damping and validating numerical simulations. In recent years, Atsavapranee et al (2007) showed that the bilge keel damping component can be modeled using the flat plate theory established by Keulegan and Carpenter (1958). This model treats the bilge keels as a flat plate that generates viscous damping, as well as added mass. The model comes as an improvement to models used in computational codes used for predicting roll damping, due to the fact that the added mass component is significant. In this study, uncoupled roll motion is investigated to quantify the rudder forces on a fully appended DTMB model #5415 with instrumented appendages at Froude numbers of 0 and 0.138. The objective of the current effort is to decompose the rudder force into its steady, symmetric, and antisymmetric components using Fourier analysis. In the force analysis the rudders are treated as flat plates for the Fr = 0 tests, using the model described by Keulegan and Carpenter (1958). The drag and lift forces are consistent with the flat plate model. The anti-symmetric term, however, does not show a clear trend. For a flat plate model, the anti-symmetric term should resemble a negative sine wave with respect to roll. However, the rudders represent a higher aspect ratio flat plate, and thus require a modification to the added mass formulation. Furthermore, during a normal roll period they tend to interact with the free surface, which can lead to wave damping, which should resemble a positive sine wave with respect to roll. Thus, the two components of the anti-symmetric portion of the signal are superimposed upon one another. In an attempt to decouple these two components, the added mass was artificially removed from the antisymmetric component of the force. This paper will detail the methods used to model the rudder forces for both the standstill and positive Froude number cases.

On Classical Plate Theory and Wave Propagation

1961 ◽  
Vol 28 (2) ◽  
pp. 223-228 ◽  
Author(s):  
M. A. Medick
Keyword(s):  
Wave Propagation ◽  
Flat Plate ◽  
Surface Area ◽  
Plate Theory ◽  
Large Radius ◽  
Classical Plate Theory ◽  
Small Surface ◽  
Transient Loading ◽  
Small Surface Area

The purpose of this investigation is to assess the applicability of classical plate theory in describing the response of a flat plate of large radius to a sharp, transient loading applied over a small surface area by evaluating its predictions and comparing them with some preliminary experiments.

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