Fluidized Bed Reactor Design for Educational Purposes: A Popcorn Reactor Case Study

Fundamental topics in chemical engineering such as fluid dynamics, heat transfer, and reactor design are often difficult for students to fully understand through theory alone. This paper presents a case study of a laboratory reactor developed as a hands-on teaching tool that integrates these key areas into a single, practical learning experience.

The designed and constructed laboratory-scale fluidized bed reactor employs popcorn production to illustrate a range of chemical engineering principles. It consists of the following:

1. Vertical glass column.
2. Thermocouple probe.
3. Fluidized bed support grid.
4. Air heater.
5. Anemometer.
6. Reinforced external casing.
   

In operation, hot air enters at the bottom, fluidizing the kernels while providing the energy and temperature needed for popping. Once popped, the kernels become lighter and larger, allowing the airflow to separate them from the unpopped kernels.

The reactor's development began by measuring the terminal velocities of unpopped kernels and popped popcorn to determine the minimum airflow for fluidization and separation. The effects of the airflow rate and heater power on air temperature were then examined to identify optimal operating conditions. Finally, popping times at various temperatures were tested to better understand the reactor’s thermal behavior.

This setup effectively translates abstract theoretical concepts into intuitive, observable phenomena. By linking input conditions to real-time system responses, it enhances student comprehension and provides a solid foundation for advanced coursework.