The apparatus consists of three concentric pipes mounted on a sturdy stand. The space between the innermost and middle pipes is filled with one type of lagging material, while a different lagging substance fills the gap between the middle and outermost pipes. A cartridge heater is positioned along the axis of the innermost pipe to provide controlled heating. The input power to the heater can be monitored using the voltmeter and ammeter provided on the control panel. Thermocouples attached to the surfaces of the pipes measure temperature at various points, allowing for accurate determination of the thermal conductivity of the insulating materials.

Experimental Objective

Plot the radial temperature distribution across the composite cylinder and determine the thermal conductivity of the pipe insulation.

Specifications

·        Innermost GI pipe: 6 cm outer diameter

·        Middle GI pipe: 8.5 cm mean diameter

·        Outermost GI pipe: 10.7 cm inner diameter

·        Pipe length: 1 meter

·        Centrally placed Nichrome wire cartridge heater of appropriate capacity

·        Single-phase dimmer stat (1 unit)

·        Voltmeter (0–250 V, 1 unit)

·        Ammeter (0–2 A, 1 unit)

·        Multichannel digital temperature indicator (0–300°C) with Cr/Al thermocouples

Utilities Required Other than above Supply

Single-phase 230 V AC electric power supply.

Required floor area 1.5meter x 1meter x 0.5meter.