• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 64
  • 32
  • 20
  • 13
  • 11
  • 2
  • 1
  • 1
  • 1
  • Tagged with
  • 165
  • 28
  • 22
  • 16
  • 15
  • 15
  • 14
  • 13
  • 12
  • 12
  • 11
  • 10
  • 10
  • 10
  • 10
  • 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.
21

Films. The spreading of liquids and the spreading coefficient ...

Feldman, Aaron. January 1922 (has links)
Thesis (Ph. D.)--University of Chicago, 1921. / "Private edition distributed by the University of Chicago libraries, Chicago, Illinois." "Reprinted from the Journal of the American Chemical Society, vol. XLIV, no. 12, December, 1922." Also available on the Internet.
22

Alteration of the surface properties of stibnite as revealed by adhesion tension studies ...

Walton, Charles William, January 1933 (has links)
Thesis (Ph. D.)--University of Michigan, 1933. / Bibliography: p. 13.
23

Alteration of the free surface energy of solids I. Vertical-rod method for the measurement of contact angles and preliminary study of effect of heat treatment on magnitude of contact angles,

Culbertson, Julian L., Bartrell, Floyd Earl, Miller, Mike Anthony, January 1936 (has links)
Thesis (Ph. D.)--University of Michigan, 1933. / Reprinted from an article, by F.E. Bartell, J.L. Culbertson, and Mike A. Miller, published in the Journal of physical chemistry, v. 40, no. 7, October, 1936. Bibliography: p. 14.
24

Relation of adhesion tension to "liquid absorption,"

Graeger, Oswald Herman, January 1900 (has links)
Thesis (Ph. D.)--University of Michigan, 1929. / "Reprinted from Industrial and engineering chemistry, vol. 21 ... December, 1929." "Literature cited": p. 8.
25

Wetting characteristics of solid surfaces covered with adsorbed films ...

Bristol, Kenneth Edwin, January 1900 (has links)
Thesis (Ph. D.)--University of Michigan, 1937. / "Reprinted from the Journal of physical chemistry, vol. 44, no. 1, January, 1940." Bibliography: p. 20.
26

An investigation of energy relations at the surface of activated silica gel ...

Almy, Ernest Grinnell, January 1900 (has links)
Thesis (PH. D.)--University of Michigan, 1932. / eContent provider-neutral record in process. Description based on print version record.
27

Alteration of the free surface energy of solids: 1. Effect of heat treatment of metals in air. 2. Effect of heat treatment of metals in a vacuum and in several gases.

Miller, Mike Anthony, Bartell, Floyd E. January 1936 (has links)
Thesis (Ph. D.)--University of Michigan, 1936. / Reprinted from two articles, by F.E. Bartell and Mike A. Miller, published in the Journal of physical chemistry, v.40, no. 7, October, 1936. Bibliography: p. 12, 21-22.
28

Experimental and numerical study of the coupling between evaporation and thermocapillarity Preparation of the Cimex-1 Experiment

Iorio, Carlo Saverio 14 September 2006 (has links)
<b>Structure of the thesis</b> The present work has been organized in two main parts: in the first one, the focus will be on the scientific and theoretical aspects of the evaporation process in presence of an inert gas flow while in the second all the technical aspects and more practical tests related to the real implementation of the micro-gravity experiment CIMEX-1 will be detailed. In any cases, the discussion will always start from the phenomenology observed considering that ” Nature is far more reach of any speculations.” <b>Part I: Evaporation in presence of inert gas</b> In chapter 1, a detailed presentation of the experimental setups for the on-ground tests is given together with the presentation of the qualitative and quantitative results obtained. Actually, the main parameters that regulate such kind of experiments are the mass flow rate of inert gas, the total pressure of the cell and the geometrical shape and dimensions of the evaporating regions. Consequently, the experiments aimed at covering the maximal possible combination of these three parameters with special attention to the variation of the inert gas flow and of the thickness of the evaporating liquid layer. More precisely, the liquid layer thickness was in the range 1.2 to 3.8 mm while the inert gas flow was set in the range 50 to 2500 ml/min. The pressure has been partially neglected as control parameter because its control was discovered not to be very reliable. The visualization system used in all the experiments consisted in a opportunely calibrated infrared camera. It allowed for having a quantitative analysis of the temperature distribution at the interface of the evaporating liquid. The infrared images also helped to follow the thermal history of the interface. In many cases, it has been possible to clearly observe the evolution of instability patterns at the interface that represent an original contribution to the understanding of such a kind of phenomena. The physical and mathematical modeling of the observed phenomenology will be the subject of the chapter 2. One of the peculiar issue of the problem under consideration is that the thermal gradient normal to the interface is not directly imposed like in the usual Marangoni-Bénard experience, but is a result of the cooling of the interface due to the evaporation. Moreover,the interface is subject to the shear stress of the inert gas flow and to the one due to the thermo-capillarity. Finally, the gas phase is to be considered as a mixture; this oblige to solve a diffusion problem in the gas phase. A physical model that takes into account the different aspects mentioned above is presented together with the governing equations and the appropriate boundary conditions. Numerical issues involved in solving the model are also analyzed. Numerical results obtained are finally discussed and compared when possible with experimental results. <b>Part II: Preparation of the CIMEX-1 experiment on-board the International Space Station.</b> In chapter 3, we will describe the main platforms used to perform low-gravity experiments. They will be classified according to the low-gravity level and to the low-gravity interval duration that could be ensured for experiments. According to these criteria, the list of the low-gravity platforms will be as follows: Drop Towers with 4 sec. of micro-gravity, Parabolic Flights that can assure not more than 25 sec., Sounding Rockets with a low-gravity time of the order of several minutes depending on the rockets, Foton Capsules that assure for many days of high quality - i.e. without perturbations - low-gravity level and , last but not least, the International Space Station where the low-gravity duration could be even of several weeks which is a sufficient time duration for the most part of the experiments. The chapter 4 will be entirely devoted to the ITEL experiment that is the precursor and the core of the CIMEX-1. After a brief overview of the experiment that has been performed twice on-board sounding rockets of the MASER class, the experimental setups used both on-ground and in micro-gravity will be detailed. The focus will be on the experimental results obtained on-ground during the preparatory tests and during the two sounding rocket flights with special attention to the first one. The analysis will be supported by the presentation of many results obtained in numerical simulations. The two parabolic flight campaigns performed to test one of the key sub-systems of the CIMEX-1 setup are the subject of the chapter 5. The separating-condensing unit is mandatory for performing the experiment on-board the International Space Station because the limitations on the crew intervention oblige to have a closed loop experiment. The goal of the two parabolic flights will be detailed together with the setup and the experimental scenario. The main results will be also shown and some considerations on the efficiency of the system will be presented. It is worthy to stress that the results obtained during these parabolic flights have been determinant at the European Space Agency level to fly the CIMEX-1 experiment on-board the International Space Station. Finally, in the section conclusions and perspectives the main results obtained will be summarized together with the new scenarios opened by the present work and some guidelines for further development in the experimental, theoretical and technical analysis.
29

Capillarity effects in textile printing

Miah, A. S. January 1985 (has links)
No description available.
30

Quasi Steady Capillary Corner Flow

Baker, John Alex 01 January 2010 (has links)
It is possible to drain slender containers filled with wetting liquids via capillary flows along the interior corners of the container. Usually the well established equations governing such flows demand numerical techniques. In the case of container draining unique boundary conditions resulting from local section geometry allow for a quasi-steady assumption and in turn permit analytical solutions. The quasi-steady assumption may also be employed for certain problems in which the corner flows cause passive capillary migration of the fluid within the container. The analytic solutions are useful because of the ease in which geometric effects may be observed. Container draining and capillary migration by means of corner flows are studied in a variety of container geometries. It is shown that careful selection of cross sectional shape can be used to maximize drain rates and minimize capillary migration times. Three-dimensional effects for these flows are investigated in tapering containers. Some simple micro-scale experiments are reported that provide confidence in the assumptions and application of the important boundary conditions that enable the solutions.

Page generated in 0.0542 seconds