PRESSURE DISTRIBUTION ON BLUNTED FLAT PLATES WITH SURFACE INCLINATION

1960 ◽  
Author(s):  
A. MARTELLUCCI ◽  
A. FIELDS
Keyword(s):  
Pressure Distribution ◽  
Flat Plates ◽  
Surface Inclination

Effect of Surface Inclination on Filmwise Condensation Heat Transfer During Flow of Steam–Air Mixtures

2020 ◽  
Vol 12 (4) ◽  
Author(s):  
Abhinav Bhanawat ◽  
Mahesh Kumar Yadav ◽  
Maneesh Punetha ◽  
Sameer Khandekar ◽  
Pavan K. Sharma
Keyword(s):  
Heat Transfer ◽  
Inclination Angle ◽  
Horizontal Surface ◽  
Condensation Heat Transfer ◽  
Experimental Program ◽  
Steam Condensation ◽  
Flat Plates ◽  
Surface Inclination ◽  
Pure Steam ◽  
Effect Of Surface

Abstract Empirical/semi-empirical correlations are available in the literature to quantify the effect of several major parameters, like bulk pressure, non-condensable gas mass fraction, and wall subcooling, on condensation heat transfer coefficient (HTC). However, despite numerous applications of condensation on inclined flat plates, there is a lack of understanding of the effect of surface inclination on condensation heat transfer. Accordingly, a dedicated experimental program was undertaken to investigate the effect of surface inclination angle on filmwise steam condensation. Experiments were performed at different bulk pressures (1.7–4.2 bar absolute) and steam-air mass fractions (ranging from pure steam, i.e., 0% to 40% w/w air), with the steam-air mixture flowing over a flat test plate (Re range, 4200–4800). In each run, the inclination angle of the test surface was varied from −90 deg (condensation underneath the horizontal surface, facing downward) to +90 deg (condensation over the horizontal surface, facing upward) in increments of 15–20 deg (inclination angle θ measured from vertical). The results reveal an intriguing trend: for pure steam condensation, the HTCs decrease as the plate is inclined in either direction from the vertical, and the variation is nearly symmetric for both upward- and downward-facing configurations. On the other hand, for steam condensation in the presence of air, the HTCs decrease monotonically for upward-facing configurations, while they increase slightly (10–20%), and decrease subsequently (for θ < −70 deg) for downward-facing cases. Finally, the HTCs for inclined orientations are compared with the HTC in the standard vertical configuration to quantify the effect of inclination angle.

A Numerical Investigation on the Influence of Lateral Boundaries in Linear Vibrating Cascades

2003 ◽  
Vol 125 (3) ◽  
pp. 433-441 ◽  
Author(s):  
Roque Corral ◽  
Fernando Gisbert
Keyword(s):  
Pressure Distribution ◽  
Numerical Investigation ◽  
Traveling Wave ◽  
Numerical Study ◽  
Wave Mode ◽  
Cfd Analysis ◽  
Flat Plates ◽  
Influence Coefficients ◽  
Interblade Phase Angle ◽  
Finite Extent

The effect of the finite extent of linear cascades on the unsteady pressure distribution of vibrating blades is assessed by means of a numerical study. The span of a reference cascade made up of flat plates has been changed to investigate its influence on the computed influence coefficients. It is concluded that the number of passages required to match a solution obtained with a traveling-wave mode strongly depends on the interblade phase angle under consideration and that existing linear vibrating cascade facilities have a marginal resolution to accurately match CFD analysis that assume that the blade is vibrating in a traveling-wave mode.

An Alternate Solution of the Deformation of a Cylinder Between Two Flat Plates

1988 ◽  
Vol 110 (4) ◽  
pp. 727-729 ◽  
Author(s):  
H. Zantopulos
Keyword(s):  
Conformal Mapping ◽  
Pressure Distribution ◽  
Elastic Deformation ◽  
Reference Point ◽  
Line Contact ◽  
Contact Deformation ◽  
Flat Plates ◽  
Alternate Solution

Using the method of conformal mapping, an alternate solution is obtained for the line contact deformation of a cylinder loaded between two flat plates. In this method, the elastic deformation of two half spaces, assuming an elliptical pressure distribution across the width of contact, does not have to be calculated relative to an arbitrarily selected stationary reference point.

A Numerical Investigation on the Influence of Lateral Boundaries in Linear Vibrating Cascades

2002 ◽  
Author(s):  
Roque Corral ◽  
Fernando Gisbert
Keyword(s):  
Pressure Distribution ◽  
Numerical Investigation ◽  
Phase Angle ◽  
Traveling Wave ◽  
Numerical Study ◽  
Wave Mode ◽  
Cfd Analysis ◽  
Flat Plates ◽  
Influence Coefficients ◽  
Finite Extent

The effect of the finite extent of linear cascades on the unsteady pressure distribution of vibrating blades is assessed by means of a numerical study. The span of a reference cascade made up of flat plates has been changed to investigate its influence on the computed influence coefficients. It is concluded that the number of passages required to match a solution obtained with a traveling-wave mode strongly depends on the inter-blade phase angle under consideration and that existing linear vibrating cascade facilities have a marginal resolution to accurately match CFD analysis that assume that the blade is vibrating in a traveling-wave mode.

THEORETICAL CONSIDERATION OF AN OSCILLATING ARC PRESSURE DISTRIBUTION

2006 ◽  
Vol 10 (4) ◽  
pp. 537-548
Author(s):  
T. Yamamoto ◽  
I. Kuno ◽  
Koichi Takeda ◽  
Takehiko Toh ◽  
Jim Tanaka ◽  
...  
Keyword(s):  
Pressure Distribution ◽  
Theoretical Consideration ◽  
Arc Pressure
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