Flow visualisation

Occupants spend a significant amount of time indoors where temperature and air quality has an important impact on their comfort, health and work performance. Understanding the role of airflow exchange between spaces is crucial to describe the processes of mixing and transport of substances driven by air motion and therefore essential for evaluating indoor air quality. This work presents the results of field measurements and laboratory experiments designed to characterise door operation and to quantify its influence on air volumes exchanged between rooms due to door motion.

The aim of this work is to observe the flow reversal that can appear at the time of interaction of hot and cold boundary layers in transient mixed convection in a vertical pipe.The instationary character of the flow is due to the application at the entry of the tube of a positive or negative temperature step. The transient mixed convection has a significant contribution in many industrial applications such as the air conditioning systems, the heat exchangers, nuclear plants, etc.