Key Features:

• Benchtop apparatus that shows heat transfer during different boiling and condensing processes
• Includes digital display of temperatures, flow rate and power
• Has a glass vessel so that students can see what is happening
• Demonstrates nucleate, film and sub-cooled boiling
• Works with TecQuipment’s optional Versatile Data Acquisition System (VDAS®) for automatic data acquisition
• Shows condensation on different surface finishes
• Shows filmwise and dropwise condensation

Description:

• Gives students an understanding of heat transfer during
  boiling and condensing
• . The equipment heats and
  condenses water, and includes a separate control module
  with a digital display.
• Heating and condensing takes place inside a partially
  filled glass vessel. A heater coil heats the water.
• Students watch the boiling process and note the different
  boiling processes. They note the free convection (before
  boiling) and the other stages (during boiling). These
  include:
  • Sub cooled boiling, where small bubbles form and rise.
  • Nucleate boiling, where large bubbles form and rise.
  • Film boiling, unstable and stable, where a vapour blanket forms and heat transfer by radiation becomes important
• For condensing heat transfer experiments, water condenses on two water-cooled vertical cylinder specimens. The cooling water flow rate and its temperature change at each cylinder helps students to find the heat transfer
• To show the effect of surface finish on heat transfer, one specimen has a gold plating and the other has an oxidised finish. They show clearly the difference between filmwise and dropwise condensation.

Learning Outcomes:

• Boiling heat transfer
• Condensing heat transfer