Lee's disc method | Thermal conductivity of bad conductor скачать в хорошем качестве

Lee's disc method | Thermal conductivity of bad conductor

This video discussed about Thermal conductivity of bad conductor by Lee’s Disc method, is used to measure the thermal conductivity of a poorly conducting material, such as glass, wood, or polymer. There is little information about the origin of the method, although it was first reported around the year 1898 by English scientist Lee. This was one of the earliest methods used to measure thermal conductivity that gave reliable results, and is a steady state method. Steady state methods are ones where the experimental setup must reach equilibrium before any calculations can be made. In comparison, transient methods are ones where equilibrium is not required before calculations are made, as calculations are made from temperature versus time curves plotted during heating. Experimental setup for Lee’s Disc method is quite simple and involves the use of two metal discs (usually brass), a steam chamber, the sample to be measured and two thermometers to measure the temperature gradient. The sample is placed in between the two metal discs (the thermometers are inserted into the metal discs) and the steam chamber is placed on top of the top metal disc. The whole setup is suspended in air so any other conduction effects are removed, although convection is a key factor in calculations. See Figure 1 for experimental setup. Topic covered from queries: Lee's disc method | Thermal conductivity of bad conductor Lee's disc method in Tamil Lee's disc method | Thermal conductivity of bad conductor