Lee’s Disc method

The thermal conductivities of the composites and silica aerogel granules are evaluated using the Lee s Disc method as per ASTM C177-13 as shown in Fig. 6.2. It consists of three copper plates (CP) with the dimensions of 75 x 45 x 3 mm and a heater measuring 75 x 45 x l mm. The heater is connected to the constant power source at 5 levels of input 1.18, 1.92, 3.16, 4.75, and 6.84 W. Thermal probes are placed on the top of the 1st CP, at the side of 2nd CP, at the side of the composite block, and at the bottom of the 3rd CP. The composite is sandwiched between the CPs and placed in an enclosed chamber shown in Fig. 6.3 at ambient pressure and temperamre for 1-2 h until the thermal probe temperatures reached steady state and recorded during this period. Typical temperature profile of silica aerogel and composite under the 5 level of power input is shown in Fig. 6.4. 

Ffe. 6.2 Thermal conductivity experimental setup using Lee s Disc method... 

Thermal conductivity k Lee s Disc method To calculate heat conduction through bulk of laminate... 

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