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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Thermal fouling studies : Computations on roughness effects, modifications of a test loop and tests...

Mayo Abad, Orestes January 1971 (has links)
The thermal fouling data of Watkinson were recomputed on the assumption that increases in pressure drop were caused entirely by roughness of the fouling deposit and not at all by blockage. The results indicate that roughness played some role in the sand-water runs, but no role in the gas oil runs. The anomalous increases in overall heat transfer coefficient with degree of fouling in the first two sand-water runs were thus explained by the effect of roughness on liquid film heat transfer coefficient. The original loop was modified, the principal change being the replacement of the manual temperature recording system by a digital Data Logging System. Fluid and wall temperatures, as well as differential pressure, could thus be automatically recorded as a function of time. Better control of independent operating variables such as fluid velocity, inlet temperature and heat flux could therefore be achieved, and the effects of temporary fluctuations in these operating conditions could be observed and separated from fouling effects. Thermal fouling runs were made in the modified heat transfer loop on samples of Bayer Process spent liquor from the ALCAN aluminum refinery in Arvida, P.Q. The only discernible trends in the results were increases in rate and degree of fouling with increasing heat flux to a maximum value, followed by a sharp decrease, at liquor velocities less than 5 ft/sec, and the absence of thermally detectable fouling at higher velocities. The unreproducibi1ity of the results is believed to be attributable, at least in part, to changes in chemical composition of the liquor throughout the experiments. / Applied Science, Faculty of / Chemical and Biological Engineering, Department of / Graduate
2

Temperature dependence of stacking fault energy in a Cu-30w/o Zn alloy

Shevlin, Craig Martin, 1943- January 1969 (has links)
No description available.
3

Effects of joints under combined loading on thermal deformation of machine tools

Abrams, D. M. A. (Donald Mark Austen) January 1984 (has links)
No description available.
4

Effects of joints under combined loading on thermal deformation of machine tools

Abrams, D. M. A. (Donald Mark Austen) January 1984 (has links)
No description available.
5

Effect of temperature on the association constants of some divalent metal ions with chloride in sea water-like solutions

Zamora, Jose Vinicio Macias 01 January 1984 (has links)
Association constants for the formation of lead (II) chloride complexes were studies in aqueous solutions also containing copper (II) and cadmium (II) ions. The ionic strength was adjusted with sodium perchlorate to resemble that of sea water. The temperature was set at fixed values between 5° and 35° C to determine the effect on the equilibria in these systems. The total metal concentration was less than 10-8 M. Differential pulse anodic striping voltammetry was used with a conventional three electrode system and a thin-film working electrode of Pt/Hg. Complex formation was followed as a function of the ligand concentration by observing the shift in the stripping peak potential Ep. The measured Ep and temperature data were used to obtain thermodynamic information on the formation of the complex ions. The activity coefficients were assumed constant at a given temperature. The values for the base ten logarithm of the overall formation constants at 25.0° are 1.11, 1.48 and 1.83 for PbCl+, PbCl°2 and PbCl-3 complexes respectively. These results are in good agreement with literature values. The Δ H of formation values for those complexes in solution were found to be positive. Tentative results were obtained for copper (II) which was only weakly complexed with Cl - under the present conditions.

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