An experimental investigation of sonic air, CO2 and Helium transverse jets in Mach 5 cross flow was carried out over a flat plate. The jet to freestream momentum flux ratio, J, was kept the same for all gases. The unsteady flow topology was examined using high speed schlieren visualisation and PIV. Schlieren visualisation provided information regarding oscillating jet shear layer structures and...

1 Institute of Medical Genetics, University of Zurich, Schlieren-Zurich, Switzerland 2Mehiläinen Clinic, Vantaa, Finland 3Department of Clinical Genetics, Helsinki University Central Hospital and Department of Medical Genetics, University of Helsinki, Helsinki, Finland 4National Institute for Health and Welfare, Helsinki, Finland 5Radiz–Rare Disease Initiative Zurich, Clinical Research Priority...

The photochromic property of bacteriorhodopsin films is exploited in the application of a focusing schlieren optical system for the visualization of optical phase information. By encoding an image on the film with light of one wavelength and reading out with a different wavelength, the readout beam can effectively see the photographic negative of the original image. The potential advantage of t...

A combined imaging system that can monitor the visible flame, invisible hot flow, flame temperature and surface was developed to investigate combustion of wooden rods inclined at 30° under forced air flow. micro wind tunnel is designed generate flow an angle with fire rod. It found a low-speed enhance burning lifetime charring rate, while high speed decrease intensity combustion. There were thr...

One of the fundamental mechanisms for detonation initiation is deflagration-to-detonation transition (DDT). This research experimentally explores runaway condition highly turbulent fast flames before DDT, which are characterized by extremely high flame speeds. Such experience increased effects compressibility and may develop a acceleration combined with pressure buildup that leads to turbulence...

To study when and where acetylcholine receptor (AChR) clusters appear on developing rat myotubes in primary culture, we have made time-lapse movies of total internal reflection fluorescence (TIRF) overlaid with schlieren transmitted light images. The receptors, including the ones newly incorporated into the membrane, were labeled with rhodamine alpha-bungarotoxin (R-BT) continuously present in ...

A computational analysis of an annular converging-diverging (CD) and an altitude adaptive expansion-deflection (ED) nozzle is presented. Numerical results were generated using a 2D axisymmetric, pressure-coupled solver in conjunction with the Spalart-Allmaras turbulence closure model and second order spatial discretisation schemes. Results were recorded over a theoretical altitude range and com...

Utilizing experimental techniques of Nano-particle based Planar Laser Scattering (NPLS) and schlieren photography, the flow patterns and mixing characteristics of a designed HYLTE (HYpersonic Low TEmperature) nozzle were investigated in this paper. In order to visualize the non-reacting flowfield of supersonic angled jets into a supersonic crossflow in the HYLTE nozzle, a testing section with w...

An experimental and numerical analysis of a low-angle annular expander nozzle is presented to observe the variance in shock structure within the flow field. A RANS-based axisymmetric numerical model was used to evaluate flow characteristics and the model validated using experimental pressure readings and schlieren images. Results were compared with an equivalent convergingdiverging nozzle to de...