VISUALIZING FROTH DYNAMICS IN AN ELECTRIC KETTLE REBOILER
HTRI has been conducting experimental research on an electric kettle reboiler at the Research & Technology Center (RTC). One of the primary objectives is to investigate froth height above the liquid level in the kettle reboiler. The two-phase upflow generated by the electric kettle bundle produces a dynamic froth, which significantly affects kettle performance, particularly liquid entrainment at the vapor outlet nozzles.
During the investigation, we controlled key parameters (e.g., electric power input, pressure, and liquid level) that impact froth height. This video, recorded through visualization windows on both sides of the kettle shell, visualizes the boiling and two-phase flow dynamics inside the reboiler.
In this specific test, we observed n-heptane boiling at a pressure of 52 kPa and a heat flux of 49 kW/m2, with the liquid level maintained at 38 mm above the top of the bundle. As shown in the video, the two-phase upflow forms an energic froth above the liquid level, generating numerous droplets— both large and small— that rise into the vapor space. These droplets have a significant impact on liquid entrainment at the vapor outlet nozzle.
Join us at our upcoming 2025 Global Conference to learn more about our kettle froth height research. Don’t miss out on the diverse lineup of informative technical presentations, an interactive poster session, and valuable software demonstrations. There will also be a panel session on Troubleshooting Thermosiphons, where industry experts will share cutting-edge insights.