APPARATUS

The apparatus consists of three pipes, viz. A heat pipe, copper pipe and stainless

steel pipe. Ail the pipes have same physical dimensions. Copper and stainless

steel pipes serve the purpose of comparison of heat pipe performance. All pipes

are mounted vertically with a band heater at lower end and water filled heat sink

at upper end. Nearly isothermal operation of heat pipe is clearly seen from

longitudinal temperature distribution of the pipe.

SPECIFICATIONS:

1.  Heat pipe - Stainless Steel pipe, 25 mm O.D., 450 mm. Long. Sealed at both 

ends, evacuated and filled partially with distilled water - one No.

2.  Copper & stainless steel pipe of same size as that of heat pipe - one each.

3.  Equal capacity heater at bottom end of each pipe.

4.  Water filled heat sinks at upper end of each pipe.

5.  a)  Dimmerstat -4 amp

  b) A voltmeter and an ammeter

  c) Multichannel digital temp. to measure temp. of pipes.Four thermocouples 

are provided on each pipe.Thermometers to take water temp. in heat sinks