Thesis (Ph. D.)--University of Wisconsin--Madison, 1981. / Typescript. Vita. Includes bibliographical references (leaves 190-194).

Inaug.-dis.--Berlin. / Lebenslauf.

Thesis (M.S.)--University of Wisconsin--Madison. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 52-53).

Thesis (M.S.)--University of Wisconsin--Madison, 1965. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Thesis (M.S.)--University of Wisconsin--Madison, 1965. / eContent provider-neutral record in process. Description based on print version record. Bibliography: l. 33-34.

Thesis (M.S.)--University of Wisconsin--Madison, 1962. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 40-42).

Thesis (M.S.)--University of Wisconsin--Madison, 1968. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Thesis (Ph. D.)--University of Chicago. / "Reprinted from the Botanical gazette, Vol. LXIX, No. 2, February, 1920." "Literature cited": p. 126.

Experiments were conducted on the motion of micron-size, spherical latex particles in stagnant liquids due to applied temperature gradients. The phenomenon, called thermophoresis, has previously been reported for gases but not for liquids. Dilute suspensions of particles in water or n-hexane were trapped between two horizontal, parallel disks. The top disk was heated whereas the lower one was cooled, thus creating a temperature gradient in the liquid. The particle motion was measured by observing light reflected from the spheres with a low power microscope. The particle thermophoretic velocity, vth, was found to be a function of temperature gradient, ▽T, absolute temperature, TK, particle thermal conductivity, kp , fluid thermal conductivity, kf, viscosity, μ, and density, ρ: [ Formula omitted ] This equation was tested in the ranges 284 °K <_ TK <_ 343 °K and 7,000 °K m ̄¹ <_ ▽T <_ 30.J.00.0. °K m ̄¹ . No dependence, on particle diameter was noted. Thermophoresis in liquids is a weak effect and impractical for liquid-particle separation. It may, however, be important in engineering situations where large temperature gradients occur. / Applied Science, Faculty of / Chemical and Biological Engineering, Department of / Graduate

The 'migrating thermal bar' phenomenon, known to occur in certain large, dimictic, freshwater lakes, has been studied in laboratory and mathematical models. The temperature fields observed in the laboratory agreed with those observed in Lake Ontario and a linear physical model for the speed of the 'thermal bar', based on negligible horizontal advection and diffusion of heat, gave reasonable values for both the laboratory model and Lake Ontario. Observations were also made of the associated velocity field. On the basis of this laboratory model, which suggests that horizontal advection and diffusion of heat were not of primary importance, mathematical models were developed. First the temperature field was calculated from the one-dimensional heat diffusion equation. Then the velocity field was calculated assuming that the flow was driven by buoyancy forces and balanced by viscous forces. On the basis of the similitude between the temperature fields found in my models and those observed in the lakes, it seems possible that the velocity field of the models also provides a good approximation to the circulation associated with the bar in lakes. There are no direct measurements of the velocities associated with the bar in lakes and they will be difficult to obtain as such velocities are expected, in Lake Ontario, to be only of the order of 1 cm sec⁻¹. / Science, Faculty of / Physics and Astronomy, Department of / Graduate