The effectiveness of steady and pulsed blowing as a method of controlling delta wing vortices during ramp pitching has been investigated in flow visualization experiments conducted in a water tunnel. The recessed angled spanwise blowing technique was utilized for vortex manipulation. This technique was implemented on a beveled 60° delta wing using a pair of blowing ports located beneath the vor...

The process to be modeled produces micro-hollow particles based on spray drying technology. This process involves droplet formation, solvent(s) evaporation, formation of the impermeable outer layer, and decomposition of the blowing agent. The objective of this work is to develop a fundamental model that describes the formation of the hollow particles starting from a single droplet. This model i...

Rigid polyurethane foams were synthesized using a renewable polyol from the simple physical mixture of castor oil and crude glycerol. The effect of the catalyst (DBTDL) content and blowing agents in the foams' properties were evaluated. The use of physical blowing agents (cyclopentane and n-pentane) allowed foams with smaller cells to be obtained in comparison with the foams produced with a che...

Direct numerical simulations are extended to see the effects of time-periodic blowing frequency from a spanwise slot on a turbulent boundary layer. The time-periodic blowing frequency is given in a range 0≤f≤0.08 at a fixed blowing amplitude of A=0.5. The effects of the blowing frequency are scrutinized by examining the phaseor time-averaged turbulent statistics. A most effective blowing freque...

Impurities in industrial silicon strongly affect the performance and appliance of products, so raw must be refined to reduce impurity content improve its quality. In this work, slag agent CaO-SiO2-CaCl2 mixed Ar-H2O-O2 gas were used refine a high-temperature blowing furnace. The effects slagging refining conditions on removal studied. chemical composition agent, mass ratio silicon, time tempera...

Whistle-blowing has long been an important organizational phenomenon that improves organizations in the long-run. Online whistle-blowing systems are becoming increasingly prevalent channels for reporting organizational abuses. Given that the Sarbanes-Oxley Act and similar financial laws throughout the world require multi-national firms to establish whistle-blowing procedures and systems, whistl...

The synthesis of high performance polyimide foams by the solid-state powder foaming of poly(amic acid) powders, containing hydrogen bonded blowing agent (THF), is described. During the thermal inflation of poly(amic acid) particles into polyimide microspheres, their fusion has been shown to produce the desired cellular architecture. In the present work, the solid state powder foaming process is...