A5044862916- Fluid Dynamics and Turbulent Flows
- Heat Transfer Mechanisms
- Fluid Dynamics and Vibration Analysis
- Wind and Air Flow Studies
- Turbomachinery Performance and Optimization
- Nuclear Engineering Thermal-Hydraulics
- Heat transfer and supercritical fluids
- Nuclear reactor physics and engineering
- Nanofluid Flow and Heat Transfer
- Computational Fluid Dynamics and Aerodynamics
- Combustion and flame dynamics
- Heat Transfer and Optimization
- Tribology and Lubrication Engineering
- Cyclone Separators and Fluid Dynamics
- Vibration and Dynamic Analysis
- Solar Thermal and Photovoltaic Systems
- Nuclear Materials and Properties
- Photovoltaic System Optimization Techniques
- Heat Transfer and Boiling Studies
- Meteorological Phenomena and Simulations
- Aerodynamics and Acoustics in Jet Flows
- Aerodynamics and Fluid Dynamics Research
- Gas Dynamics and Kinetic Theory
- Metallurgical Processes and Thermodynamics
- Hydraulic and Pneumatic Systems
University of Manchester
2016-2025
Technion – Israel Institute of Technology
2024
Institute of Science and Technology
1984-1987
The idea behind the marine cloud-brightening (MCB) geoengineering technique is that seeding stratocumulus clouds with copious quantities of roughly monodisperse sub-micrometre sea water particles might significantly enhance cloud droplet number concentration, and thereby albedo possibly longevity. This would produce a cooling, which general circulation model (GCM) computations suggest could-subject to satisfactory resolution technical scientific problems identified herein-have capacity...
Laser-Doppler measurements of the longitudinal and circumferential velocity components are reported for developing turbulent flow in a strongly curved 180 deg pipe its downstream tangent. In bend, mean component changes little after θ = 90 deg, but never achieves fully-developed state. Similar behavior is observed normal stresses, with large levels anisotropy arising everywhere bend Between X/D 5, profiles display reversals secondary which essentially independent Reynolds number. Predictions...
Nanoparticles when used even in relatively low concentrations, can significantly alter the thermal properties of a base working fluid, thereby substantially enhancing performance power generation system. In present study, numerical simulations were performed for solar collector to test effectiveness six non-metallic nanoparticles, namely aluminum oxide (Al2O3), cerium (CeO2), copper (CuO), ferric (Fe2O3), titanium dioxide (TiO2) and Silicon (SiO2). These nanoparticles dispersed individually...
Floating photovoltaic systems deployable on ponds, lakes and water bodies are an attractive solution in cell technology with several advantages respect to land-based installations, including a reduced expensive land investment required, evaporation, suppression of algae growth. Moreover, the body can be exploited as heat sink for thermal management cells, thereby decreasing working temperature increasing efficiency. High temperatures fact one major problems which degrade panels' electrical...
Wall functions are widely used and offer significant computational savings compared with low-Reynolds-number formulations. However, existing schemes based on assumed near-wall profiles of velocity, turbulence parameters, temperature which inapplicable in complex, nonequilibrium flows. A new wall function has therefore been developed solves boundary-layer-type transport equations across a locally defined subgrid. This approach applied to plane channel flow, an axisymmetric impinging jet, flow...
Fine-grid computations are reported of turbulent flow through a square sectioned U-bend corresponding to that for which Chang et al. (1983a) have provided detailed experimental data. A sequence modeling refinements is introduced: the replacement wall functions by fine mesh across sublayer; abandonment PSL approximation (in pressure variations near-wall sublayer neglected); and introduction an algebraic second-moment (ASM) closure in place usual k–ε eddy-viscosity model. Each refinement shown...
In this study, we numerically investigated the effect of swirl inserts with and without nanofluids over a range Reynolds numbers for parabolic trough collectors non-uniform heating. Three approaches were utilized to enhance thermal-hydraulic performance—the variation geometrical properties single canonical insert find optimized shape; use analysis both aforementioned approaches; generators together. Results revealed that using straight conical strips alone enhanced Nusselt number by 47.13%....
This paper reports results from the use of laser-Doppler anemometry (LDA) to measure mean and fluctuating flow field in a U-bend strong curvature, Rc/D = 0.65, that is either stationary or rotating orthogonal mode (the axis rotation being parallel curvature). The data acquisition system enables optical fiber probe collect sweeping past it. Three cases have been examined, all concerning Reynolds number 100,000; case, case positive pressure side duct coincides with outer U-bend) at rotational...
The flow-induced vibration of a cantilever rod confined in pipe and exposed to an axial water flow has been experimentally investigated using simple test piece designed be informative for water-cooled nuclear reactor fuel rods. Reynolds number was varied between 7.43 k 82.5 k: range that significantly extends the scope existing data. Measurements were carried out non-contact techniques: fast video imaging used track motion, whilst particle image velocimetry employed resolve field. sources...
The paper reports an experimental study of impingement cooling in a rotating passage semi-cylindrical cross section. Cooling fluid is injected from row five jet holes along the centerline flat surface and strikes concave surface. rotates orthogonally about axis parallel to that jets. Tests have been carried out, using water, both within as fluid, at fixed Reynolds number 15,000, for clockwise counter-clockwise rotation. Local Nusselt measurements, liquid-crystal technique, show under...
CFD calculations of turbulent flow near smooth walls generally employ one two broad strategies to resolve the very influential, complex, but thin near-wall viscosity-affected sub-layer. One approach uses a fine numerical mesh and turbulence model incorporating viscous influences; other employs "wall functions"—formulae that attempt account for overall resistance sublayer momentum heat transport. The latter requires only fraction computational effort former is thus strongly favoured...