Study Concerning the Improvement of Biphasic Contact of the Coloumns with Structured Packing

2008 ◽  
Vol 59 (1) ◽  
pp. 65-69
Author(s):  
Andra Tamas ◽  
Nadia Pop ◽  
Zeno Gropsian
Keyword(s):  
Surface Tension ◽  
Direct Effect ◽  
Contact Surface ◽  
Surface Condition ◽  
Separation Process ◽  
Structured Packing ◽  
Packing Element ◽  
Materials Used ◽  
Packing Efficiency ◽  
Experimental Values

In this paper is being studied the behaviour of structured packing subjected to certain chemical, thermal or electrochemical treatments, in specified conditions (temperature and exposure time). The wettability of the materials used has a direct effect on the liquid layer, being influenced by the density, viscosity and surface tension of the liquid as well as the surface condition, which has allowed the comparison of the thickness experimental values with those determined analytically. The treatments applied had in view the possibility of improving or regenerating the packing efficiency as a result of the changes that occur on the contact surface. The characterization was done after each treatment. Also, it was established the number of equilibrium stages related to one packing element used in the separation process.

Prediction of the Condensation Coefficient on Horizontal Integral-Fin Tubes

1985 ◽  
Vol 107 (2) ◽  
pp. 369-376 ◽  
Author(s):  
R. L. Webb ◽  
T. M. Rudy ◽  
M. A. Kedzierski
Keyword(s):  
Surface Tension ◽  
Theoretical Model ◽  
Surface Tension Force ◽  
Tension Force ◽  
Condensation Coefficient ◽  
Film Drainage ◽  
Predicted Values ◽  
Experimental Values ◽  
Fin Tubes

A theoretical model is developed for prediction of the condensation coefficient on horizontal integral-fin tubes for both high and low surface tension fluids. The model includes the effects of surface tension on film drainage and on condensate retention between the fins. First, the fraction of the tube circumference that is flooded with condensate is calculated. Typically, the condensation coefficient in the flooded region is negligible compared to that of the unflooded region. Then the condensation coefficient on the unflooded portion is calculated, assuming that surface tension force drains the condensate from the fins. The model is used to predict the R-11 condensation coefficient on horizontal, integral-fin tubes having 748, 1024, and 1378 fpm. The predicted values are within ±20 percent of the experimental values.

Surface Tension, Screen Space

2020 ◽  
Author(s):  
Giuliana Bruno
Keyword(s):  
Surface Tension ◽  
Surface Condition ◽  
A Site ◽  
Screen Space ◽  
Film And Video ◽  
Screen Surface

My work questions how material relations can appear on the surface of different media—on film and video screens, in gallery installations, or on the skins of buildings and people. In response to these issues, I propose to approach materiality as a surface condition. Focusing on screen surface, I show that technologies of light can produce new forms of materiality. In this text, the screen emerges as a site of encounter and admixture. Various experiments of screening are considered, ranging from those envisaged by László Moholy-Nagy to the contemporary installations of Krzysztof Wodiczko. In these configurations of the act of screening, different forms of mediation, memory, and transformation can take place. This is what I call ‘the surface tension of media’.

scholarly journals Experimental study of the wake behind a surface-piercing cylinder for a clean and contaminated free surface

2000 ◽  
Vol 402 ◽  
pp. 109-136 ◽  
Author(s):  
AMY WARNCKE LANG ◽  
MORTEZA GHARIB
Keyword(s):  
Surface Tension ◽  
Free Surface ◽  
Turbulent Flows ◽  
Cross Sections ◽  
Surface Deformation ◽  
Surface Condition ◽  
Free Surface Flows ◽  
Shear Stresses ◽  
Surface Contaminants ◽  
A New Technique

This experimental investigation into the nature of free-surface flows was to study the effects of surfactants on the wake of a surface-piercing cylinder. A better understanding of the process of vorticity generation and conversion at a free surface due to the absence or presence of surfactants has been gained. Surfactants, or surface contaminants, have the tendency to reduce the surface tension proportionally to the respective concentration at the free surface. Thus when surfactant concentration varies across a free surface, surface tension gradients occur and this results in shear stresses, thus altering the boundary condition at the free surface. A low Reynolds number wake behind a surface-piercing cylinder was chosen as the field of study, using digital particle image velocimetry (DPIV) to map the velocity and vorticity field for three orthogonal cross-sections of the flow. Reynolds numbers ranged from 350 to 460 and the Froude number was kept below 1.0. In addition, a new technique was used to simultaneously map the free surface deformation. Shadowgraph imaging of the free surface was also used to gain a better understanding of the flow. It was found that, depending on the surface condition, the connection of the shedding vortex filaments in the wake of the cylinder was greatly altered with the propensity for surface tension gradients to redirect the vorticity near the free surface to that of the surface-parallel component. This result has an impact on the understanding of turbulent flows in the vicinity of a free surface with varying surface conditions.

Butt jointing performance for remountable HTS magnet by improving contact surface condition

2006 ◽  
Vol 81 (8-14) ◽  
pp. 1491-1496 ◽  
Author(s):  
S. Ito ◽  
H. Hashizume ◽  
K. Yuki ◽  
S. Takami ◽  
Y. Yamamoto
Keyword(s):  
Contact Surface ◽  
Surface Condition ◽  
Hts Magnet

Paper 3: Non-Contact Surface Contour Analyser

1967 ◽  
Vol 182 (11) ◽  
pp. 360-367 ◽  
Author(s):  
B. E. Keller
Keyword(s):  
Contact Surface ◽  
Surface Condition ◽  
Three Dimensional ◽  
Light Spot ◽  
Test Surface ◽  
Basic Technique ◽  
Surface Contour ◽  
Data Points ◽  
Dimensional Surface

This paper describes the development of an accurate and rapid non-contact technique for numerically defining three-dimensional surface contour. Because the basic technique uses a diffusely reflected spot of light on the test surface to define surface position, considerable attention is given to surface condition variables which influence the ability and effectiveness of following a moving light spot on a test surface. Methods for transforming data points representative of surface contour into a practical form satisfying engineering and inspection requirements are also discussed.

Behavior of Thermally Sprayed WC-Co Layers on 5086 Aluminum Alloy and 304 L Stainless Steel

2013 ◽  
Vol 550 ◽  
pp. 41-47
Author(s):  
N. Boualem ◽  
A. Raid ◽  
M.A. Ghaffor ◽  
A. Tlemçani ◽  
M. Derrar
Keyword(s):  
Stainless Steel ◽  
Aluminum Alloy ◽  
Surface Coating ◽  
Surface Condition ◽  
Thermal Spraying ◽  
Operating Conditions ◽  
Average Grain Size ◽  
Indentation Tests ◽  
Materials Used ◽  
Thermally Sprayed

Thermal spraying is a process for surface coating by projecting a material in powder or in wire form on a material with a previously prepared surface. The materials used in our study are 5086 aluminum alloy and 304 L stainless steel with various surface qualities: polished 120, mirror polished and sandblasted. The projection powder is a combination of "ceramic-metal" WC-Co whose average grain size is 30 microns. The layers thicknesses obtained after 3 passes vary between 90 and 120 microns depending on the operating conditions: gas protection, temperature and surface condition. Indentation tests at the substrate-layer interface and micrographic sections revealed the roughness importance to allow a better layers grip.

scholarly journals Design and Fabrication of Groundnut Shell Remover

2019 ◽  
pp. 316-323
Author(s):  
Ganesh M ◽  
Sethuraaman. A ◽  
Jagadeesan S
Keyword(s):  
Mild Steel ◽  
Separation Process ◽  
Material Damage ◽  
Type B ◽  
Product Demand ◽  
Pitch Length ◽  
Materials Used ◽  
Groundnut Shell ◽  
Von Mises ◽  
Peasant Farmers

Groundnut product demand is on the increase and the application is largely dependent on the cleanness of the nuts. The separation process is usually an energy sapping task that requires a lot of time. In order to separate the nuts from its shell effectively a shelling machine was developed. The machine employs an auger screw as a means of breaking the groundnut pod. The machine basically comprises of shelling chamber, separating chamber and a motor (1HP). The arrangement of these parts is connected by a compound belt of type B standard V-belt of pitch length 1694mm. With the Von-mises equation, the material for the shelling shaft is taken to be mild steel. The materials used in the fabrication of the machine are sourced locally so as to ensure that it is cheap, affordable and easily maintained by the peasant farmers. The shelling efficiency and material damage are 84% and 14% respectively for groundnut seeds of 86.5% dry.

scholarly journals NUMERICAL SIMULATION OF THE MOVEMENT OF SMOOTH PARTICLES AT THE ELECTROMAGNETIC SEPARATORS WITH DRUM

2015 ◽  
Vol 21 (3) ◽  
pp. 13-21
Author(s):  
TUDOR CĂSĂNDROIU ◽  
GABRIELA VALERIA CIOBANU ◽  
LIANA ALEXANDRA VIŞAN
Keyword(s):  
Numerical Simulation ◽  
Numerical Simulations ◽  
Case Studies ◽  
Surface Condition ◽  
Separation Process ◽  
Free Flight ◽  
Air Resistance ◽  
Sorting Process

The paper presents the main theoretical elements underlying the seeds separation process after their surface. During the seed cleaning and sorting process according to the surface condition machines with electromagnetic or magnetic separators drums are used. In this paper is made a comparative theoretical analyze of smooth seeds movement on electromagnetic drum surface and trajectory in free flight, neglecting and taking into consideration air resistance, detached from the separation drum and it is evaluated the collection area of detached seeds. On this basis, were carried out several case studies and numerical simulations for three different machines.

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