The effects of condensation of the world.ng gee (nitrogen) on pitot and static pressures in the R.A.R.D.E. hypersonic gun tunnel have been examined and the onset of condensation determined for flow Mach numbers of 8.4, 10.4 and 12.9. A large degree of supersaturation was observed at the two higher Maoh numbers. Symbols M flow Mach number P statio pressure P 1 stagnation pressure p2 pitot pressu...

The problem of the formation of a stagnation knot in the head of a precessing stellar jet is investigated from both an analytical and numerical point of view. This dense structure is formed via a similar method to that proposed by Steffen (these proceedings) for the formation of FLIERS in planetary nebulae. Initial results suggest that the formation of a stagnation knot is possibly an intrinsic...

Asymptotic methods based on those of geometrical optics are applied to some steady convection-diffusion streamed flows at a high Péclet number. Even with the assumption of inviscid, irrotational flow past a body with uniform ambient conditions, the rays from which the solution is constructed can only be found after local analyses have been carried out near the stagnation points. In simple cases...

Internal mist/steam blade cooling technology has been considered for the future generation of Advanced Turbine Systems (ATS). Fine water droplets of about 5 mm were carried by steam through a single slot jet onto a heated target surface in a confined channel. Experiments covered Reynolds numbers from 7500 to 25,000 and heat fluxes from 3 to 21 kW/m. The experimental results indicate that the co...

Stent placement keep artery open but it perturbs more often blood flow. Stent shape in artery can provoke the presence of recirculation zones, blood stagnation zones, thrombosis and embolism. the aim of this work is to find optimal stents shapes in order to reduce blood stagnation and recirculation zones. As it has already been observed [2], [8] a stent associated with a higher value of shear s...

High ionic loadings were found in fogwater collected at Bakersfield. California during an extended stagnation episode. The major ions were NH:, NOT, and SO:-, with concentrations usually in the millimolar range. Droplet growth played an important r6le in determining fogwater concentrations. The amount of solute decreased substantially over the course of each fog event; this was attributed, at l...

ZBIGNIEW LEYK Abstract. One of the disadvantages of Krylov subspace iterative methods is the possibility of breakdown. This occurs when it is impossible to get the next approximation of the solution to the system of linear equations Au = f . There are two di erent situations: lucky breakdown, when we have found the solution and hard breakdown, when the next Krylov subspace cannot be generated a...

What Explains the Stagnation of Female Labor Force Participation in Urban India? We study the surprisingly low level and stagnation of female labor force participation rates in urban India between 1987 and 2009. Despite rising growth, fertility decline, and rising wages and education levels, women’s labor force participation stagnated at around 18%. Using five large cross-sectional micro survey...

Interior stagnation point flows of viscoelastic liquids arise in a wide variety of applications including extensional viscometry, polymer processing and microfluidics. Experimentally, these flows have long been known to exhibit instabilities, but the mechanisms underlying them have not previously been elucidated. We computationally demonstrate the existence of a supercritical oscillatory instab...

We report an integrated microfluidic device for fine-scale manipulation and confinement of micro- and nanoscale particles in free-solution. Using this device, single particles are trapped in a stagnation point flow at the junction of two intersecting microchannels. The hydrodynamic trap is based on active flow control at a fluid stagnation point using an integrated on-chip valve in a monolithic...