Flare gas recovery in a gas refinery

In this paper, the impact of micro bubbles as the second phase in the turbulent flow inside the channel flow has been investigated. The developed turbulent flow inside channel containing micro bubbles has been solved using large eddy simulation. Numerical analysis has been done to survey the impact of micro bubbles on turbulent characteristics derived from carrier flow. Finally, the mechanism of reducing frictional drag force was illustrated. According to the results, increasing the volume fraction of bubbles in the constant diameter will decrease the frictional drag force. Also studying the energy spectrum showed that the energy in the small scales has increased and in the large scales decreased.

Numerical investigation of the effect of injector installation on the performance of blowdown supersonic wind tunnels in the presence of shock waves

Supersonic wind tunnels are strong and useful tools for the detection of the flow physics around flying vehicles. In this work, a blowdown type supersonic wind tunnel with a Mach number of 3 was studied. The required air for the tunnel was supplied by a storage tank containing compressed air. The intended velocity in the test section of the wind tunnel is provided by the high pressure discharge of the air from the storage tank into the atomosphere. The nozzle's geometry has been designed based on the "characteristics" method. Embedding the injector in the wind tunnel provides the opportunity to launch the wind tunnel at lower compression ratios. Since the duration of the experimental data collection is limited in blowdown supersonic wind tunnel, proper design and exploitation of the injector in a way to allow tunnel launching at decreased compression ratios, provides significant influence on the saving the compressed air of the storage tank and increasing the experiment duration. It has been attempted in this work to study the effect of installation of the injector in wind tunnel through assessing the boundary layer and the flow physics inside the wind tunnel. The results show that the injected flow increases the energy level of the low energy boundary layer, so as the energy of the boundary layer in a placed ahead of the injector location is higher than a place before the injector location. This fact results in a decreased required compression ratio for tunnel launching. The physics of the formed flow was studied and physical phenomena such as boundary layer separations, bow shock, barrel shock and mach disk were reported around the injection site

Journal of Selected Topics in Energy

Flare gas recovery in a gas refinery

Numerical investigation of the effect of injector installation on the performance of blowdown supersonic wind tunnels in the presence of shock waves