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 fi lled glass vessel. A heater coil heats the water. For boiling heat transfer experiments, students adjust the current in a resistant wire heater element in the water. The temperature of the wire reaches signifi cantly higher than 100°C. Students watch the boiling process and note the diff erent 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 fl ow rate and its temperature change at each cylinder helps students to fi nd the heat transfer. To show the eff ect of surface fi nish on heat transfer, one specimen has a gold plating and the other has an oxidised fi nish. They show clearly the diff erence between fi lmwise and dropwise condensation.
Learning outcomes
Boiling heat transfer
Condensing heat transfer
Features
- Bench-mounting apparatus that shows heat transfer during diff erent boiling and condensing processes
- Includes digital display of temperatures, fl ow rate and power
- Has a glass vessel, so that students can see what is happening
- Demonstrates nucleate, film and sub-cooled boiling
- Works with optional Versatile Data Acquisition System (VDAS®) for automatic data acquisition
- Shows condensation on different surface finishes
- Shows filmwise and dropwise condensation
Specifications
ATICO is committed to a programme of continuous improvement; hence we reserve the right to alter the design and product specifi cation without prior notice.
Nett dimensions and weight:
Main unit: 800 mm x 400 mm x 850 mm and 55 kg
Control cabinet: Approximately 500 x 550 x 400 mm and 25 kg
Packed dimensions and weight:
Packed product: 0.71 m3 and 160 kg
Bulk heater power: 2.5 kW
Condensing cylinders:
One gold plated, one oxidised
Outside diameters 15 mm, eff ective lengths 100 mm
Operating Conditions
Operating environment:
Laboratory
Storage temprature range :
–25°C to +55°C (when packed for transport)
Operating temprature range :
+5°C to +40°C
Operating relative humidity range :
80% at temperatures < 31°C decreasing linearly to 50% at 40°C
