Here we report the expression of the zebrafish zic1 gene, also known as opl, a homologue to other vertebrate Zic genes and the Drosophila odd-paired gene. zic1 expression starts during epiboly stages in lateral parts of the neural plate and eventually comes to lie in dorsal regions of the developing brain following the morphogenetic movements of neural tube formation. To address the question wh...

Present study examines turbulent structures of a rough bed open-channel flow in the context of deterministic approach. Instantaneous velocity field is measured in different hydraulic conditions using two dimensional Particle Image Velocimetry (PIV) in vertical plane and Stereoscopic PIV in horizontal plane. Different techniques and quantities such as swirl strength, two-point and cross-correlat...

The conditions in which meridional recirculations appear in swirling flows above a fixed wall are analysed. In the classical Bodewädt problem, where the swirl tends towards an asymptotic value away from the wall, the well-known "tea-cup effect" drives a flow away from the plate at the centre of the vortex. Simple dimensional arguments applied to a single vortex show that if the intensity of the...

The present work is a study of the gas-flow phenomenon known as the ?end of the vortex? (EoV), which spontaneously occurs at the lower end, or under, reverse-flow centrifugal separators such as cyclones or swirl tubes. Different CFD models of swirl tubes have been built to study and analyse this phenomenon in detail. The present numerical work is based on ? and compared with ? previous experime...

The type of turbine developed is based on the very low head of water potential source for the electric power production. The area of research is focused for the axial water turbine that can be applied at the simple site open channel with has a very low cost and environmental impact compared to the conventional hydro installation. High efficiency of axial turbine which applied to the very low po...

Burning hydrogen in gas turbines is a relevant technological solution to decarbonize power production and propulsion systems. However, ensuring low NOx emission preventing flashback can be challenging with hydrogen. Stabilization regimes pollutant emissions from partially premixed CH4/H2/air flames above coaxial Dual Fuel Swirl injector are investigated laboratory-scale combustor at atmospheric...

Simultaneous dual-plane PIV experiments were performed in streamwise-spanwise planes in the log region of a turbulent boundary layer at a moderate Reynolds number (Reτ ∼ 1100). The acquired datasets were used to resolve all 9 velocity gradients from which the complete vorticity vector and other invariant quantities like 3-D swirl strength were computed. These derived quantities were used to ana...