Thesis (Ph. D.)--University of Wisconsin--Madison, 1954. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 161-164).

A convenient method for measuring the thermal conductivity of liquids is that introduced by Bridgman in 1923. In this procedure the liquid is held in the annular space between two concentric cylinders. By supplying heat at & definitely known rate to the inner cylinder and measuring the temperature drop across the liquid, the thermal conductivity of the liquid may be determined. Because the liquid film is only 0.04 cms. in thickness and the temperature drop across the film does not exceed one degree, convection withing the liquid is prevented. The temperature drop across the film is measured by means of differential thermocouple Bridgman's cell has the advantage over other thermal conductivity apparatuses In that it requires only a very small volume of liquid for the measurement. In this investigation the thermal conductivities of cis- and trans-decahydronaphthalene were measured. When the results were compared with those of Levelton and Perris, who determined the same quantities by the method of Bates, it was found that lower values had been obtained for both the thermal conductivities and the temperature coefficients. The difference in the conductivity may be explained in part by the surface film discovered by Bates. In Bridgman's apparatus no allowance is made for this film and the measured temperature drop represents the average temperature gradient from one boundary of the liquid to the other. Unless this surface film changes considerably with temperature it would offer no explanation for the very definite difference found in the temperature coefficients. Attempts to explain the divergence of results on the basis of purity of materials meet with little success because of a lack of necessary data. An attempt has been made to design a simplified cell based on the same principles as Bridgman's cell and is offered herewith. / Applied Science, Faculty of / Chemical and Biological Engineering, Department of / Graduate

The problem is to determine the solubility of solid trans decahydro-naphthalene in liquid sulphur dioxide in the temperature range -4-0.0° to -70.0°. Factors affecting the solubility determinations are discussed in detail. Particular emphasis is placed on the design, construction, and operation of the precision cryostat and the auxiliary equipment, and on the safety precautions which must be taken. The experimental data is presented along with a sample calculation to show how the data was treated before the solubility graph was plotted. (Since the solubility relationship should be approximately linear in this temperature range, the "best-fitting" line (calculated by the method of least squares) was included in the plot of solubility versus temperature. / Applied Science, Faculty of / Chemical and Biological Engineering, Department of / Graduate

No abstract / Applied Science, Faculty of / Chemical and Biological Engineering, Department of / Graduate

[No abstract submitted] / Science, Faculty of / Physics and Astronomy, Department of / Graduate

[No abstract submitted] / Science, Faculty of / Chemistry, Department of / Graduate

[No abstract submitted] / Science, Faculty of / Chemistry, Department of / Graduate

[No abstract submitted] / Applied Science, Faculty of / Chemical and Biological Engineering, Department of / Graduate