Inner Waves Characteristics in a Stratified Ventilated Environment (The Effect of Momentum Jet)

Abstract

An experimental work was carried out to investigate the effect of inner waves on the stability of flow characteristics in ventilated space. Theoretical and experimental techniques were presented. Energy dissipation by waves and its effect on the performance of ventilation was considered. Analysis of engineering systems in the bases of the internal waves and thermal concept was considered to find out the best ventilation process. The mixing process was investigated experimentally using a turbulent round jet impinged from the ceiling on the inner wave’s zone. It was carried out at a flow Reynolds number of 7,000< Re <30,000 and a flow Richardson number of 0< Ri< 200 based on the local jet scales. In the mixing process a hot and cold air are introduced to a confined space, to mix in the ventilated space to break down the waves. The results showed that the amount of momentum needed is depending on the wave’s amplitude, frequency and flow conditions. It can be seen that the jet momentum has significant influence on breaking down the inner waves and mixing the flow.

Keywords: inner waves, stability, ventilated space, Energy dissipation