| Project/Area Number |
58850040
|
|---|
| Research Category |
Grant-in-Aid for Developmental Scientific Research
|
| Allocation Type | Single-year Grants |
|---|
| Research Field |
Thermal engineering
|
|---|
| Research Institution | Kyushu University |
|---|
Principal Investigator |
FUJII Tetsu 九州大学, 生科研, 教授 (20038574)
|
|---|
| Project Period (FY) |
1983 – 1985
|
| Project Status |
Completed (Fiscal Year 1985)
|
| Budget Amount *help |
¥6,000,000 (Direct Cost: ¥6,000,000)
Fiscal Year 1985: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1984: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1983: ¥3,500,000 (Direct Cost: ¥3,500,000)
|
|---|
| Keywords | Thermal Conductivity / Steady Method / Small Sphere / Free Convection / Fluid Mixture / 混合流体 |
|---|
| Research Abstract |
This project was performed to develop a new apparatus for measuring thermal conductivities of gases and liquids. The principle of the apparatus is based on the theoretically established heat-transfer-characteristics for steady free convection from an isothermal sphere.
A very simple apparatus was devised with a bead thermistor as the heated sphere. From the tests with the apparatus, following results were obtained:
(1) Various effects caused by the difference in shape between the thermistor and an ideal sphere, nonuniform temperature distribution due to heterogeneous heat generation in the thermistor and heat loss from lead wires can be accurately estimated by introducing an effective diameter of the thermistor and three apparatus constants.
(2) Inner diameter of sample vessel must be larger than about 30 and 40 times of thermistor diameter for liquids and gases, respectively.
(3) Inaccuracy of the present method is estimated to be within 2% from the measurements for air, water, ethanol, methanol and refrigerant R113, when the other physical properties are known.
(4) The measurements of thermal conductivities of binery liquid mixtures of waterethanol, water-methanol and R113-oil show that this apparatus is effective to the basic study for characteristics of thermal conductivities of fluid mixtures.
The measurement for biological fluids has been undertaken.
|
