scholarly journals Deflection of plumes by mantle shear flow: experimental results and a simple theory

1988 ◽  
Vol 94 (3) ◽  
pp. 367-376 ◽  
Author(s):  
M. A. Richards ◽  
R. W. Griffiths
Keyword(s):  
Shear Flow ◽  
Simple Theory ◽  
Experimental Results

Paper 6: Effect of Vapour Drag on Laminar Film Condensation on a Vertical Surface

1965 ◽  
Vol 180 (10) ◽  
pp. 280-287 ◽  
Author(s):  
Y. R. Mayhew ◽  
D. J. Griffiths ◽  
J. W. Phillips
Keyword(s):  
Reynolds Number ◽  
Liquid Film ◽  
Atmospheric Pressure ◽  
Vertical Surface ◽  
Simple Theory ◽  
Experimental Results ◽  
Film Condensation ◽  
Laminar Film ◽  
Laminar Film Condensation

A simple theory is presented for laminar film condensation of a pure vapour on a vertical surface which takes account of the drag induced on the liquid film by the flow of the condensing vapour. Experiments were carried out with steam at atmospheric pressure condensing inside a vertical 1.824 in diameter tube 8 in high. The downward vapour velocity was varied from 5 to 150 ft/s, the corresponding range of the film Reynolds number at the bottom of the tube being 200-500. Experimental results agreed well with the theory.

The Development of the Reynolds Stress Tensor in a Turbulent Shear Flow

1970 ◽  
Vol 92 (4) ◽  
pp. 836-842
Author(s):  
S. J. Shamroth ◽  
H. G. Elrod
Keyword(s):  
Shear Flow ◽  
Stress Tensor ◽  
Linear Model ◽  
Reynolds Stress ◽  
Experimental Results ◽  
Turbulent Shear ◽  
Turbulent Shear Flow ◽  
Reynolds Stress Tensor ◽  
Theoretical Predictions

The development of the normalized Reynolds stress tensor, uiuj/q2, in the region upstream of a fully developed, turbulent shear flow is investigated. An inviscid, linear model is used to predict values of the normalized Reynolds stress tensor as a function of position. The theoretical predictions are then compared with experimental results.

On the stable shape of subliming bodies in a high-enthalpy gas stream

1963 ◽  
Vol 15 (1) ◽  
pp. 119-132 ◽  
Author(s):  
Peter G. Simpkins
Keyword(s):  
Boundary Layer ◽  
Mass Transfer ◽  
Simple Theory ◽  
Experimental Results ◽  
Poor Agreement ◽  
Total Enthalpy ◽  
High Enthalpy ◽  
Recession Rate ◽  
Series Of Experiments ◽  
Stable Shape

This paper describes a series of experiments carried out in a high-enthalpy stream of argon on materials that are known to sublime. The results confirm that an axisymmetric Teflon model ablates to a stable shape which is independent of the initial nose profile. The effect of changing the total enthalpy of the gas is simply to alter the recession rate of the nose. The experimental results show poor agreement with a simple theory which ignores the effects of mass transfer in the boundary layer.

Reconsidered Method for Validation of Experimental Data for Direct Contact Condensers With Zero Vapor Outflow

2019 ◽  
Vol 142 (2) ◽  
Author(s):  
Nikola Jaćimović
Keyword(s):  
Experimental Data ◽  
Direct Contact ◽  
Simple Theory ◽  
Experimental Results ◽  
Total Data ◽  
Data Points

Abstract Method presented in the paper is a reconsideration of the already published equations for a quick and reliable verification of experimental results related to direct contact condensers with zero vapor outflow. Both original and reconsidered methods presented by the author are confirmed by a large number of experimental data (more than 1250 total data points) which took over one decade of experiments on four different column types. Both methods draw the background in sound and simple theory and should be considered as very reliable while easy to use in practice.

Second Paper: A Simple Theory for Longitudinal Pressure Drop in the Presence of Lateral Condensation

1965 ◽  
Vol 180 (1) ◽  
pp. 36-42 ◽  
Author(s):  
R. S. Silver ◽  
G. B. Wallis
Keyword(s):  
Pressure Drop ◽  
Velocity Profile ◽  
Momentum Transfer ◽  
Simple Theory ◽  
Experimental Results ◽  
Satisfactory Treatment

The use of the Reynolds flux to assess momentum transfer and pressure drop behaviour in condensation was a basic idea of a paper by Silver (1)†. In the present paper the same concepts are used with more consistent logic to develop a simpler and more satisfactory treatment. Experimental results of velocity profile measurements show that the assumptions made are permissible. The predictions from the improved theory are generally in accord with those previously given by Silver (1) and now confirmed by Wallis in the first of these two papers.

scholarly journals Partial Strake Coverage Vortex-Induced Vibration Benchmarking Using SHEAR7v4.5

2009 ◽  
Author(s):  
Hayden Marcollo ◽  
J. Kim Vandiver
Keyword(s):  
Experimental Data ◽  
Shear Flow ◽  
Laboratory Data ◽  
Experimental Results ◽  
High Mode ◽  
Flow Conditions ◽  
Vortex Induced Vibration ◽  
Future Improvement

A VIV benchmarking study was undertaken using SHEAR7v4.5 against NDP high mode VIV response laboratory data. The purpose of which was to derive an improved set of modeling parameters for partial strake coverage cases whilst not comprising previous accuracy of shear flow bare riser response predictions. Fifty percent (50%) partial strake coverage experimental data was utilized from both uniform and shear flow conditions while bare data was also included in the activity for reference purposes. The results showed that such an activity can derive an improved set of modeling parameters that significantly improve the ability to match experimental results and also highlight where future improvement efforts can be targeted.

An experimental study of shear-enhanced convection in a mushy layer

2008 ◽  
Vol 612 ◽  
pp. 363-385 ◽  
Author(s):  
JEROME A. NEUFELD ◽  
J. S. WETTLAUFER
Keyword(s):  
Shear Flow ◽  
Flow Direction ◽  
Flow Speed ◽  
Experimental Results ◽  
Mushy Layer ◽  
Engineering Systems ◽  
Controlled Cooling ◽  
A Value ◽  
Constant Rate ◽  
Theoretical Predictions

The influence of an external shear flow on the evolution of a solidifying array of dendritic crystals, termed a mushy layer, is investigated through controlled cooling of an aqueous ammonium chloride solution in a laboratory flume. The controlled cooling produces a mushy layer that grows at a constant rate from the base of the flume over which a laminar shear flow is applied. We find a critical flow speed above which a spatiotemporal variation of the solid fraction of the layer appears with a planform transverse to the flow direction. The presence of this distinctive pattern of spanwise crevasses is compared with a simplified stability analysis in which the motion of the external fluid over the corrugated mush–liquid interface produces a pressure perturbation that drives flow and phase change within the mushy layer. This flow leads to a pattern of solidification and dissolution that is compared to the experimental results. The physical mechanism underlying the pattern formation is confirmed by the agreement between the theoretical predictions and experimental results. Finally, the comparison between theory and experiment provides a value for the mushy layer permeability, the evolution of which is of relevance to a host of geophysical, biological and engineering systems.

Lattice Boltzmann Simulations of Single Bubble Deformation and Breakup in a Shear Flow

2012 ◽  
Vol 4 (1) ◽  
pp. 111-117 ◽  
Author(s):  
Yi. kun. Wei ◽  
Yuehong. Qian ◽  
Hui. Xu
Keyword(s):  
Shear Flow ◽  
Numerical Simulations ◽  
Lattice Boltzmann ◽  
Rotation Angle ◽  
Experimental Results ◽  
Single Bubble ◽  
Bubble Deformation ◽  
Lattice Boltzmann Simulations ◽  
Boltzmann Method ◽  
Theoretical Results

Lattice Boltzmann method (LBM) is used to simulate the deformation and breakup of single bubble in a shear flow. Numerical simulations of single bubble deformation are qualitatively compared with experimental results in a shear flow. Respectively the rotation angle θ is quantitatively compared with experimental results according to different capillary numbers ( Ca), which shows numerical simulations are in agreement with the experimental results and theoretical results. Finally, the breakup process of single bubble in a shear flow is simulated straightforwardly.

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