Some evolved stars in the pre-planetary nebula phase produce highly-collimated molecular outflows that resemble the accretion-driven jets and outflows from pre-main sequence stars. We show that IRAS 16342-3814 (the Water Fountain Nebula) is such an object and present K-band integral field spectroscopy revealing a fast (> 150 km s) bipolar H2 outflow. The H2 emission is shock excited and may ari...

Series of laboratory tests were carried out to study the extent of scour caused by a three-dimensional wall jets exiting from a square cross-section nozzle and into a non-cohesive sand beds. Previous observations have indicated that the effect of the tail water depth was significant for densimetric Froude number greater than ten. However, the present results indicate that the cut off value coul...

A circular disc hitting a water surface creates an impact crater which after collapse leads to a vigorous jet. Upon impact an axisymmetric air cavity forms and eventually pinches off in a single point halfway down the cavity. Two fast sharp-pointed jets are observed shooting up- and downwards from the closure location, which by then has turned into a stagnation point surrounded by a locally hyp...

We demonstrate the generation of water-in-water (w/w) jets and emulsions by combining droplet microfluidics and aqueous two-phase systems (ATPS). The application of ATPS in microfluidics has been hampered by the low interfacial tension between typical aqueous phases. The low tension makes it difficult to form w/w droplets with conventional droplet microfluidic approaches. We show that by mechan...

We present several experiments that can be done using a digital camera or a webcam, including the shapes of shadows cast by lampshades, the trajectories of water jets, the profile of a hanging chain, and caustic figures produced by the reflection of light on mirrors of different forms. The experiments allow for a simple and direct quantitative comparison between theory and experiment. © 2006 Am...

In this study, thermoelectric generation with impinging hot and cold nanofluid jets is considered computational fluid dynamics by using the finite element method. Highly conductive CNT particles are used in water jets. Impacts of Reynolds number nanojet stream combinations (between (Re1, Re2) = (250, 250) to (1000, 1000)), horizontal distance jet inlet from device (r1, r2) (?0.25, ?0.25) (1.5, ...

The study of bubble clustering processes may provide a significant insight into turbulent air–water flows. Previous studies investigated these processes in plunging jets, dropshafts and hydraulic jumps. This research investigates the bubble clustering process in hydraulic jumps using experimental data collected in a rectangular horizontal flume with partially developed inflow conditions for inf...

Submitted for the DFD10 Meeting of The American Physical Society Coaxial twin-fluid atomization with pattern air gas streams CHIN HEI NG, ALBERTO ALISEDA, University of Washington — Coaxial twin-fluid atomization has numerous industrial applications, most notably fuel injection and spray coating. In the coating process of pharmaceutical tablets, the coaxial atomizing air stream is accompanied b...

The study of clustering processes is fundamentally significant in hydraulic engineering to comprehend the interactions between turbulence and particles. Previous studies on bubble clustering were carried out in plunging jets, hydraulic jumps and dropshafts. The present paper focuses on the bubble clustering process in a large-size dropshaft, and three criteria for cluster identification were ap...

Abstract Previous studies have suggested that the quasi-stationary jets, sometimes called “Isoguchi jets” in western North Pacific Ocean, regulate warm and salty conditions transition domain between Subarctic Boundary Front. Here, we show mesoscale eddies interannual/decadal modulations are responsible for Kuroshio water intrusion into domain. A case study using Lagrangian coherent structure su...