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Lee's Disc Apparatus
Thermal Conductivity Measurements

Model: HO-AE-LD18
Price : $ 3,492.00

Holmarc's Lee's Disc Apparatus (Model : HO-AE-LD18) is designed for the measurement of thermal conductivity in bad conductors. Thermal conductivity is the property of a material that indicates its ability to conduct heat. Conduction takes place if there exists a temperature gradient in a solid (or stationary fluid) medium.

Lee's Disc Apparatus comprises of a brass disc resting on another slab of the same dimension with special heating coil. Both metallic discs have radial holes for the sensitive thermistors. Material under test is placed in between two discs. The heater is turned on and the apparatus is left idle until the temperature gets stabilized. At this point the heat energy passing through the heat sample will be exactly equal to the heat flowing out of the lower block.

Maximum temperature the disc can achieve during the experiment is around 50 degree Celsius to make it safe for handling with even bare hands. Similarly, operating voltage for heating coil sandwiched between the discs is fixed as 50 V for safety. The temperature sensors used are highly sensitive and accurate with least count as low as 0.2 degree Celsius. Front panel is equipped with digital display and keyboard for user friendly operation.

This instrument provides the facility for performing experiments using different kinds of sample materials. The front panel includes LCD display and keyboard for readouts and settings.

There are three operation modes for this Equipment - Manual mode, Auto mode and PC mode. In manual mode, the user can calculate thermal conductivity using the acquired data manually. In auto mode, the user can retrieve result directly from the system once the temperature stabilized. In PC mode, one can monitor progress of the experiment through a computer and can calculate thermal conductivity with the help of Holmarc’s software. This diversity of usage makes the equipment user friendly.

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Caution : Do NOT touch the discs with bare hands during the time of heating. High temperature can make severe burns in the body. Try to use gloves for handling the discs.

Experiment

    To determine thermal conductivity of bad conductors (Glass, Nylon, Plywood, etc.) in the form of a disc using Lee's method.

Thermal conductivity,

k  =  (Mc dT / dt )  /  (πr2 (T2 - T3) )  ×  (r + 2h) d / 2( r + h) W  /  mK-1

Where,

M = Mass of the metallic disc

c = Specific heat capacity of the metallic disc

h = Height of the metallic disc

r = Radius of the metallic disc

dT / dt = Rate of cooling of the metallic disc at T2

d = Thickness of the sample

T2 - T3 = Steady temperatures recorded at T2 and T3 respectively

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Established in 1993, Holmarc Opto-Mechatronics Ltd manufactures variety of scientific and engineering instruments for research, industry and education.

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