The issue of spontaneous ignition of highly pressurized hydrogen release is of important safety concern, e.g. in the assessment of safety risk and design of safety measures. This paper reports on recent numerical investigation of this phenomenon through releases via a tube using a 5-order WENO scheme. A mixture-averaged multi-component approach was used for accurate calculation of molecular tra...

In this paper, some results are provided for minimum time roll about velocity vector maneuvering with thrust-vectoring and aerodynamic control in effect. The mathematical model for attitude motions of the aircraft is developed. First order necessary conditions for optimality using Pontryagen principle is applied, and the existence of an extreme family of solutions for the maneuver is shown. Mul...

As reflected in the literature, solid-fluid flow characteristics in spouted beds can vary widely when particles are coated by a suspension. This work is aimed at describing the effect of interparticle forces on airflow distribution in conical spouted beds of inert particles coated by Eucalyptus black liquor. The simulator developed earlier is modified to incorporate this effect. Two corrective ...

An experiment to isolate protein from single cell was carried to obtain the following results. Under the condition of spouting pressure 600kg/cmcm2, clearance between nozzle and disk 30mm, petroleum yeast and Chlorella algae could be crashed about 98%, Baker's Yeast could be done about 93%. The most suitable clearance betwen nozzle and disk to crash single cell was 20 mm at spouting pressure 40...

Vibration of gas-solid fluidized beds is often used to enable fluidization cohesive particles; however, it has also been shown reduce the minimum velocity (Umf). Here, we show via experiments that vibration can both Umf and bubbling (Umb) in Geldart Group B D particles. We observe reduced more than Umb, thereby creating a densely packed, bubble-free state when superficial gas between Umb. Umb d...

A theoretical framework has been developed describing nonequilibrium formation and maintenance of mixed-phase clouds. The necessary and sufficient conditions required to activate liquid water within a preexisting ice cloud, and thus convert it to mixed phase, are considered for three scenarios: (i) uniform ascent, (ii) harmonic vertical oscillations, and (iii) turbulent fluctuations. The genera...