• Study of the temperature distribution along an extended surface and comparing the result with a theoretical value.
  • Study of the heat transfer from an extended surface resulting from the combined modes of free convection and radiation heat transfer and comparing the result with a theoretical analysis.
  • Determination of the constant of proportionality (thermal conductivity k) of the rod material.


  • Bench top unit
  • Anodized aluminum frame and panels made of painted steel.
  • Heating element, embedded in a copper capsule to permit a good contact with the interchangeable fins.
  • The copper capsule is isolated by a coat of Teflon.
  • Brass pin with heater at one end and nine positions for thermocouples along its length
  • Nine temperature sensors, “K” type.
  • The power of the heating element is regulated from the electronic console (0~100%).

An extended surface is commonly used in reference to a solid that experiences energy transfer by conduction within its boundaries, as well as energy transfer by convection between its boundaries and its surroundings. The extended surface is most often utilized in the removal of heat from a body. In this case, the extended surface is often referred to as a “fin”. A fin with a cylindrical shape and a high aspect ratio (length/diameter) is called a pin. Fins are often seen in electrical appliance cooling such as in a computer power supply or substation transformers. Fins are also used for engine cooling. Figure 1 illustrates different fin shapes. The Extended Surface Heat Transfer Extended consists of one electrically heated rod and nine temperature sensors to study heat transfer by conduction in an extended surface. The sensor measures temperature distribution along the rod with one sensor used as a control sensor (ambient temperature). Optional interchangeable fins can be installed in the apparatus to enhance the heat dissipation functionally of the apparatus. This instrument can help student to understand the basic concept of heat transfer and the importance.