background and objective : a considerable amount of sulfur hexafluoride is applied to evaluate the performance of each laboratory hood according to ashrae–110-95 method. sf 6 is extremely hostile to environment and expensive. in present work, the possibility of conducting this method of hood performance test with less volume of sf 6 was investigated. material and methods : the performance of a ...

A granular gas may be modeled as a set of hard-spheres undergoing inelastic collisions; its microscopic dynamics is thus strongly irreversible. As pointed out in several experimental works bearing on turbulent flows or granular materials, the power injected in a dissipative system to sustain a steady-state over an asymptotically large time window is a central observable. We describe an analytic...

Gas target injection system is newly fabricated to observe behaviors of injected fast ignition targets. It can eject a mimic by pressured nitrogen gas and magnetic separator. The flight attitude observed high-speed cameras. Analysis camera images indicates that the velocity increased with pressure up around 100 m/s which meets demanded specification reactor angle varied in wide range shot shot....