Fine bubble modelling of smoke flows

摘要

This short note presents a simple experimental modelling technique for smoke spread and movement in enclosures and sloping tunnels by using fine hydrogen bubbles, which are generated by electrolysis in a water tank. Results obtained from two independent experiments agree very well with each other, demonstrating the consistency of the new experimental method. The experimental results for the stratification interface height are also in good agreement with both the experimental data and theoretical predictions available in the literature. The developed method is then used to study smoke spread in a tunnel fire, and the effect of tunnel slopes on smoke movement is visualised.