Research on Thermal Conductivities of Composite Soil
碩士 === 國立中央大學 === 土木工程學系 === 84 === The thermal problem civil engineering always faces is how to control the situation of heat dissipating or insulation between structures and surroundingenvironment. The thermal properties like coefficient of thermal cond...
| Main Authors: | , |
|---|---|
| Other Authors: | |
| Format: | Others |
| Language: | zh-TW |
| Published: |
1996
|
| Online Access: | http://ndltd.ncl.edu.tw/handle/66401125774746623766 |
| Summary: | 碩士 === 國立中央大學 === 土木工程學系 === 84 === The thermal problem civil engineering always faces is how
to control the situation of heat dissipating or insulation
between structures and surroundingenvironment. The thermal
properties like coefficient of thermal conductivity design or
determination of buffer materials around some special
underground structures would be the important key. To obtain a
desired thermal conductivi-ty, mixing two kinds of soil material
possessing different thermal properties at various volumetric
fractions was usually economical and probable. A
heat-flow-meter method was used to measure the thermal
conductivities of mixtures of two dry porous materials. Also we
observed the relationship between thermal conductivities and
volumetric fractions of composites. Mix- tures that owned two
kinds of particles and porous could be regarded as a three-
phases system coming from two kinds of two-phases materials that
owned only one kind particle and porous. A constituent
volumetric fraction model was conducted to distinguish the
very respective fractions and thermal con- ductivities of the
two composites. Both they''re two-phases materials. Results
indicated that the high-thermal-conductivity materials had a
pronounced influ-ence on the heat-conduction process in the
composite mixtures. Evaluations andcomparisons with some
theories also indicated that prediction value all well agreed
with experiment value.
|
|---|