科研之友
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摘要
Many natural bodies as well as materials inside industrial installations, such as the Earth's mantle and the glass inside melting furnaces, exchange matter through convection. These processes result from differences in temperature, density, and chemical concentration. In this analysis, we focus on the visualization of thermally driven flows in the laboratory. In nature and in industrial installations, it is difficult to measure the temperature inside the object of interest directly. We benchmark a new DC-geoelectrical 3-D tomography method for temperature measurements that allows obtaining temperature values without influencing the flow pattern. For verification of the method, we use dissolved polymer polyethylene glycol heated in a tank as a laboratory analogue. The temperature inside the viscous material is measured indirectly by DC electrodes placed on the sides of the tank. The principle for conversion of the 3-D inverted geoelectrical data into temperatures is based on the adjusted Arrhenius temperature dependence of the electrical conductivity. In this way, the 3-D temperature distribution is calculated from the distribution of electrical conductivity in the tank. To verify the validity of the method, the calculated temperatures are compared with the temperatures recorded by the 29 thermometers on the sidewalls of the tank. The minor deviations obtained demonstrate the suitability of this method.
- 出版日期2010-12-14
- 单位CSIRO
