1 |
Analytical and numerical continuation methods for conductive temperature fieldsEggers, Dwight Edward 17 July 1975 (has links)
The continuation of conductive temperature fields is being
considered. The continuation of a field involves the extrapolation of a
field known over a limited domain to an adjacent domain in such a way
that it satisfies the heat conduction differential equation and other
imposed constraints. Continuations forward in time and toward the
interior of the space from the constraining initial and boundary conditions
are expressed analytically as convolution integrals. Solutions
are approximated using linear filter methods in real and transform
spaces. The inverse problems of continuation toward the constraining
conditions are expressed in real space as power series of derivatives.
Solutions are approximated as convolution filtering operations.
Variational methods are also used to solve problems which do not
yield to convolution filtering operations. The suitability of these
approximation methods is shown in two ways: (1) the frequency
response of the derived convolution coefficients are compared with the
analytic transfer functions; and (2) the methods are applied to artificial
test cases.
These field continuation methods provide a tool for the
interpretation of observational temperature data. Several examples
of field data are treated using these techniques; (1) A case of the
temperature inversion observed in a geothermal borehole is explained
by a transient flow of thermal water along a narrow horizontal fracture;
(2) Soil temperature data are treated to determine the in situ
thermal diffusivity and show that departures from conductive conditions
are accounted for by evaporative effects; (3) Shallow borehole
temperature data which exhibit the nonstationary effects of the annual
cycle are shown to be influenced by convective effects in the soil. / Graduation date: 1976
|
2 |
Flow through thin triangular sectionsMarburger, Ivan Lloyd, 1931- January 1960 (has links)
No description available.
|
3 |
Transient heat conduction in infinite plates situated in a fourth-power radiative environmentCrawford, Martin 12 1900 (has links)
No description available.
|
4 |
The measurement of thermal conductivity at high temperaturesBowen, Mack Donald 05 1900 (has links)
No description available.
|
5 |
The prediction of heat transfer in rough pipesMcAndrew, Murray Alexander January 1962 (has links)
An evaluation of methods for predicting turbulent heat transfer in rough pipes has been made with the intention of obtaining a better understanding
of the transfer processes involved and of providing a general design equation, valid for all types of roughness shapes and distributions. The equations of Martinelli, Nunner, and Mattioli, along with an empirical method suggested by Epstein, have been tested using the available experimental data. In addition, particular attention has been given to a proposed method which makes use of the velocity profile equations of Rouse and von Karman in Lyon's fundamental equation for the Nusselt number.
The results indicate that the proposed method is not successful, largely because of ignorance of velocity conditions near the walls of rough pipes. Mattioli's equation also does not give a satisfactory correlation of experimental results. Epstein's empirical method, which, in the pertinent dimensionless groups, uses friction velocity and equivalent sand-roughness height of the roughness elements in place of the average fluid velocity and the pipe diameter, respectively, shows promise but requires further investigation. Nunner's equation and Martinelli's (simplified) equation give good prediction of the experimental results and are recommended for use at present, providing 0.5 < Pr < 1.0. The success of these latter equations gives support to the hypothesis that the fluid adjacent to a rough wall is probably in laminar motion.
Using Nunner's model of the flow conditions in rough pipes, equations have been derived for predicting temperature profiles from velocity profile data. Generally, the absolute agreement between predicted profiles and Nunner’s experimental profiles is good, but the influences of Re and especially f are not too well accounted for. Nunner's conclusion that temperature and velocity profiles in rough pipes are not similar is substantiated by the results. / Applied Science, Faculty of / Chemical and Biological Engineering, Department of / Graduate
|
6 |
Certain steady state and transient time phenomena in heat conductionHadley, Charles Wendell. January 1940 (has links)
LD2668 .T4 1940 H34 / Master of Science
|
7 |
Heat conduction in polycrystalline metal films鍾業華, Chung, Yip-wah. January 1973 (has links)
published_or_final_version / Physics / Master / Master of Philosophy
|
8 |
Numerical methods in aero-engine heat transferHoggard, T. W. January 1986 (has links)
No description available.
|
9 |
Empirical determination of radial and axial effective thermal conductivities in a packed bedSerjak, William C., 1922- January 1967 (has links)
No description available.
|
10 |
A cylindrical probe for determination of thermal constants in situYarger, Douglas Neal, 1937- January 1962 (has links)
No description available.
|
Page generated in 0.0811 seconds