The efficiency of the vertically arranged expanded metal sheets for evaporative cooling and air humidification

1977 ◽  
Vol 42 (4) ◽  
pp. 1118-1128 ◽  
Author(s):  
Z. Brož ◽  
G. P. Pascalev
Keyword(s):  
Evaporative Cooling ◽  
Expanded Metal ◽  
Metal Sheets ◽  
Air Humidification

Effect of liquid viscosity on liquid side mass transfer coefficient at vertical film flow on expanded metal sheets

1983 ◽  
Vol 48 (3) ◽  
pp. 861-876 ◽  
Author(s):  
Zdeněk Brož ◽  
Mirko Endršt
Keyword(s):  
Mass Transfer ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Kinematic Viscosity ◽  
Film Flow ◽  
Vertical Surface ◽  
Liquid Viscosity ◽  
Expanded Metal ◽  
Metal Sheets ◽  
Good Agreement

Experimental results are presented on the effect of liquid viscosity on absorption rate of carbon dioxide into a liquid film flowing downward the vertical surface of expanded metal sheets. On basis of these results the conclusion has been reached that the Highbie model does not enable to predict the effect of kinematic viscosity on liquid side mass transfer coefficient k1. The film-penetration model has been proposed where the existence of non-mixed region is assumed at the interface with the thickness ϑ and to it periodically incoming disturbances with the length scale of disturbance λ and characteristic Reynolds number of disturbance equal to one. On basis of experimental data were evaluated the dimensionless thicknesses of the film and penetration regions ϑ+ = 0.04 and λ+ = 10.6. A good agreement of the measured and calculated values of the mass transfer coefficient k1 were obtained for three types of expanded metal sheets of vertical pitch diagonal 10, 16 and 28 mm and nine liquids with kinematic viscosities within the range from 0.6 to 15.1 μm2s-1.

The gass-side mass transfer coefficient and the interfacial area under the turbulent flow over the packing of parallel expanded metal sheets

1980 ◽  
Vol 45 (2) ◽  
pp. 457-463
Author(s):  
Jan Lacina ◽  
Zdeněk Brož ◽  
Václav Kolář
Keyword(s):  
Mass Transfer ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Unit Area ◽  
Interfacial Area ◽  
Expanded Metal ◽  
Specific Interfacial Area ◽  
Interfacial Surface ◽  
Metal Sheets ◽  
Experimental Values

Specific interfacial area has been computed from experimental values of the gas-side volume mass transfer coefficient, kga, and the theoretically derived expressions for gas-side mas transfer coefficient per unit area of interfacial surface, kg. The results have been compared with the specific interfacial area determined experimentally using the chemical method.

Gas holdup in stacked expanded metal sheets

AIChE Journal ◽  
1992 ◽  
Vol 38 (12) ◽  
pp. 1864-1870
Author(s):  
Stella Piovano ◽  
Ursula Böhm ◽  
Juan I. Franco
Keyword(s):  
Gas Holdup ◽  
Expanded Metal ◽  
Metal Sheets

Slip traces caused by plastic deformation during recrystallization of thin metal sheets

1994 ◽  
Vol 52 ◽  
pp. 620-621
Author(s):  
H. Lin ◽  
D. P. Pope
Keyword(s):  
Grain Size ◽  
Grain Boundaries ◽  
Sample Thickness ◽  
List Type ◽  
Metal Sheets ◽  
Second Phases ◽  
Slip Traces ◽  
Series Of Experiments ◽  
Cold Rolled ◽  
Individual Grains

During a study of mechanical properties of recrystallized B-free Ni3Al single crystals, regularly spaced parallel traces within individual grains were discovered on the surfaces of thin recrystallized sheets, see Fig. 1. They appeared to be slip traces, but since we could not find similar observations in the literature, a series of experiments was performed to identify them. We will refer to them “traces”, because they contain some, if not all, of the properties of slip traces. A variety of techniques, including the Electron Backscattering Pattern (EBSP) method, was used to ascertain the composition, geometry, and crystallography of these traces. The effect of sample thickness on their formation was also investigated.In summary, these traces on the surface of recrystallized Ni3Al have the following properties:1.The chemistry and crystallographic orientation of the traces are the same as the bulk. No oxides or other second phases were observed.2.The traces are not grooves caused by thermal etching at previous locations of grain boundaries.3.The traces form after recrystallization (because the starting Ni3Al is a single crystal).4.For thicknesses between 50 μm and 720 μm, the density of the traces increases as the sample thickness decreases. Only one set of “protrusion-like” traces is visible in a given grain on the thicker samples, but multiple sets of “cliff-like” traces are visible on the thinner ones (See Fig. 1 and Fig. 2).5.They are linear and parallel to the traces of {111} planes on the surface, see Fig. 3.6.Some of the traces terminate within the interior of the grains, and the rest of them either terminate at or are continuous across grain boundaries. The portion of latter increases with decreasing thickness.7.The grain size decreases with decreasing thickness, the decrease is more pronounced when the grain size is comparable with the thickness, Fig. 4.8.Traces also formed during the recrystallization of cold-rolled polycrystalline Cu thin sheets, Fig. 5.

New corrosion inhibitors for evaporative cooling systems

2013 ◽  
Vol 44 (1) ◽  
pp. 39-54
Author(s):  
A. Wehlmann ◽  
W. Hater ◽  
F. Wolf ◽  
R. Lunkenheimer ◽  
C. Foret ◽  
...  
Keyword(s):  
Corrosion Inhibitors ◽  
Evaporative Cooling ◽  
Cooling Systems
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