Effect of temperature on rates of permeation of chloride ions and water vapour through alkyd coatings —

1978 ◽  
Vol 7 (2) ◽  
pp. 4-8 ◽  
Author(s):  
R. Vittal Rao ◽  
M. Yaseen
Keyword(s):  
Water Vapour ◽  
Chloride Ions ◽  
Effect Of Temperature ◽  
Alkyd Coatings

scholarly journals Effect of non-isothermal flow on chloride ion transport in saturated concrete

2021 ◽  
Vol 248 ◽  
pp. 01022
Author(s):  
Chen Peng ◽  
Qing Wu ◽  
Jun Xu
Keyword(s):  
Ion Transport ◽  
Fluid Motion ◽  
Convective Motion ◽  
Chloride Ion ◽  
Chloride Ions ◽  
Isothermal Flow ◽  
Ion Concentration ◽  
Effect Of Temperature ◽  
Finite Element Software ◽  
Chloride Ion Transport

The presence of a temperature difference changes the mode of motion of the fluid. The macroscopic motion of the fluid causes the relative displacement between the various parts of the fluid, which in turn affects the transfer of temperature in the medium. To investigate the effect of temperature transfer coupled fluid motion on chloride ion transport in concrete, a mesoscopic model of chloride ion transport in non-isothermal flow of concrete was established and compared with experimental data. Based on the finite element software, the influence of temperature transfer on the internal fluid motion and chloride ion transport of concrete was analyzed. And the effect of convective motion of fluid on the temperature transfer in concrete was studied. It is found that when the heating time is the same, the dynamic viscosity of the fluid in the concrete decreases with the increase of temperature; the chloride ion concentration increases with the increase of temperature at the same depth of concrete; when considering the influence of laminar flow, the temperature is transmitted faster in the concrete and exhibits uneven diffusion from high temperature to low temperature; non-isothermal flow promotes the diffusion of chloride ions in concrete, and the higher the temperature.

THE EFFECT OF TEMPERATURE DIFFERENTIAL ON THE MOISTURE CONTENT OF STORED WHEAT

1943 ◽  
Vol 21c (10) ◽  
pp. 297-306 ◽  
Author(s):  
J. Ansel Anderson ◽  
J. D. Babbitt ◽  
W. O. S. Meredith
Keyword(s):  
Moisture Content ◽  
Laboratory Experiment ◽  
Water Vapour ◽  
Initial Moisture Content ◽  
Effect Of Temperature ◽  
Western Canada ◽  
Temperature Differential ◽  
Slow Process ◽  
Equilibrium Conditions ◽  
Convective Movement

Local increases in the moisture content of dry wheat stored in country elevator annexes have occasionally been observed in Western Canada. A laboratory experiment suggests that the chief cause is a temperature differential established during the winter. The air in the warmer parts of the grain contains a greater quantity of water vapour than that in the colder, and moisture is transferred either by diffusion or by the convective movement of the air as a whole. A temperature difference of 35 °C, across 6 ft. of grain having an initial moisture content of 14.6%, caused the moisture content at the cold end (0 °C.) to rise to over 20% in 316 days. The experiment indicates that this movement of moisture is a slow process and that equilibrium conditions are never established for any practical length of time or mass of wheat.

Oxidation of X20 in Water Vapour: The Effect of Temperature and Oxygen Partial Pressure

2009 ◽  
Vol 71 (3-4) ◽  
pp. 201-218 ◽  
Author(s):  
Anette N. Hansson ◽  
Melanie Montgomery ◽  
Marcel A. J. Somers
Keyword(s):  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Water Vapour ◽  
Effect Of Temperature

Chloride Stress Corrosion Cracking of Austenitic Stainless Steel—Effect of Temperature and pH★

CORROSION ◽  
1958 ◽  
Vol 14 (12) ◽  
pp. 60-64 ◽  
Author(s):  
L. R. SCHARFSTEIN ◽  
W. F. BRINDLEY
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Stainless Steels ◽  
Chloride Ions ◽  
Corrosion Cracking ◽  
Effect Of Temperature ◽  
Type 304 ◽  
Chloride Stress Corrosion Cracking

Abstract Overstressed U-bends of Types 304 and 347 stainless steels were exposed to water containing chloride ions to determine the susceptibility of these steels to stress corrosion cracking between the temperatures of 165 F and 200 F. The pH was controlled at 6.5 to 7.5 and 10.6 to 11.2 for the tests. At the high pH, cracks appeared at the edges with little evidence of pitting. At the neutral pH, cracks were found at the edges and associated with pits. Sensitized Type 304 had longer and deeper cracks than annealed Types 304 and 347 in the same exposure time. Conclusion is made that chloride stress corrosion cracking of these steels in the temperature range of 165 F to 200 F is less severe than that experienced at 500 F and that specific conditions are required for corrosion cracking to occur at all. 3.2.2

OXYGEN EVOLUTION FROM SODIUM HYPOCHLORITE SOLUTIONS

1962 ◽  
Vol 40 (4) ◽  
pp. 729-733 ◽  
Author(s):  
M. W. Lister ◽  
R. C. Petterson
Keyword(s):  
Activation Energy ◽  
Ionic Strength ◽  
Oxygen Evolution ◽  
Rate Constant ◽  
Sodium Hypochlorite ◽  
Chloride Ions ◽  
Effect Of Temperature

The rates of oxygen evolution from carefully purified solutions of sodium hypochlorite have been measured. Methods of purification are described, and it is found that substantially the same rate is observed regardless of the method of purification. The rate of oxygen evolution is proportional to the square of the concentration of hypochlorite ions. The effect of temperature and ionic strength are examined. The rate constant is 7.5 × 10−6 (g-mol/I.)−1(min)−1 at 60 °C and an ionic strength of 3.5; the activation energy is 26.6 kcal/g-mol. These results are compared with the corresponding quantities for the reaction of hypochlorite ions to form chlorite and chloride ions, and some tentative explanations are offered.

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