Das Wärmeleitfähigkeitsmessgerät mit Plattenmethode ist eine Art Instrument zur Messung der Wärmeleitfähigkeitseigenschaften von Substanzen, and it is also a commonly used experimental equipment in thermal physics research. It is to clamp the heat transfer sample between two thermal insulation plates, and apply a constant temperature difference on one of the plates, and calculate its thermal conductivity by measuring the heat conduction rate of the substance in a certain time. Its advantages are relatively simple operation, high measurement accuracy, widely used in material science, electronic engineering, thermal engineering and other fields.

Die Verwendung des Wärmeleitungsinstruments mit Plattenmethode

Erste, the working principle

The measurement principle is based on the law of heat transfer, which states that when there is a temperature difference between two objects, heat transfer occurs between two objects. In the plate method thermal conductivity meter, the sample to be measured is sandwiched between two thermal insulation plates to make it a heat conduction body, and then a heating source is placed on one of the thermal insulation plates to form a certain temperature difference, and the heat flow and temperature difference of the sample to be measured are measured, so as to calculate its thermal conductivity.

Ii. Composition

It is mainly composed of temperature controller, heater, insulation plate, temperature measuring resistor and so on. The temperature controller is the core part of the whole instrument, which mainly plays the role of controlling temperature. The heater is the source of heating, and the constant current source heater is usually used, which can provide relatively stable heating power. The thermal insulation plate mainly plays the role of giving the temperature gradient and providing heat, and the thermal insulation layer can ensure that there is no influence of thermal radiation and heat convection between the sample to be tested and the plate. The temperature resistance is used to measure the temperature difference and heat flow of the sample to be measured, and is an indispensable part of the heat conduction experiment.

Third, the use of flat plate heat conduction instrument

Die Verwendung des Wärmeleitungsinstruments mit Plattenmethode

1. Pre-treatment: Before starting up, the entire instrument must be pre-treated first, mainly in order to make the components reach a relatively stable state, such as heaters, temperature resistance and so on.

2. Probenvorbereitung: Sample preparation is also a key step in the heat conduction experiment, the size and geometry of the sample must meet the requirements, the general requirement is that the area of the sample is greater than the area of the shape of the insulation plate to ensure effective heat conduction.

3. Sample holding: Place the sample between two insulated plates with a certain distance and clamp it tightly to ensure that the sample will not move and fall off.

4. Install temperature resistance: Fix the temperature resistance in the middle of the sample to measure the temperature difference and heat flow of the sample.

5. Apply temperature gradient: send the heater into the constant current source, make it start heating, and measure the temperature on another insulation plate to ensure that a certain temperature difference is generated.

6. Experimental data calculation: After the measurement data is collected, the thermal conductivity of the sample needs to be calculated.

Die Verwendung des Wärmeleitungsinstruments mit Plattenmethode

IV. Anwendung

It is widely used in materials science, electronic engineering, thermal engineering and environmental science. In materials science, it can help people understand the thermal conductivity properties of various materials, so as to guide the development and production of materials. In electronic engineering, it can be used to test the heat dissipation in various electronic equipment to improve the stability and service life of the equipment. In environmental science, it can be used to study the thermal conductivity properties of geological materials such as different kinds of soil and rocks, so as to make more accurate analysis and prediction of geological environment.