In this paper, we describe an experimental study of the phenomenon of spray cooling in the case of liquid helium, either normal or superfluid, and its relationship to the heat transfer between an atomized diphasic flow contained in a long pipe, and the pipe walls. This situation is discussed in the context of the cooling of the superconducting magnets of the Large Hadron Collider (LHC). Experim...

Quenching cooling rate of rotary hollow cylinder by one row of water impinging jets has been experimentally studied. Water jets (d = 8 mm) with sub-cooling 55 to 85 ◦C and Reynolds number 8,006 to 36,738 impinged over rotary hot hollow cylinder (rotation speed 10 to 70 rpm) with initial temperature 250 to 600 ◦C. Impingement impact angle of row of jets varied between 0 to 135 ◦ and jet-to-jet s...

Stochastic cooling of the spectrometer ring (SRing) at High Intensity Heavy-Ion Accelerator Facility (HIAF) project in China, which is used mainly for experiments with radioactive fragment beams, applied to speed up process a stored ion beam. In this study, both Faltin traveling wave structure and novel slot-ring standing based on ceramic vacuum chamber are discussed evaluated pickup/kicker SRi...

An experimental/computation investigation was carried out to develop a MEMS-based micro cooling device to provide direct cooling to high heat flux electronics and MEMS devices. This device uses the electrohydrodynamic principles to pump and form an ultra thin film over a heated surface that requires cooling. The important part is played by applying an electric field to a set of interdigitated i...

The solar contribution to global mean air surface temperature change is analyzed by using an empirical bi-scale climate model characterized by both fast and slow characteristic time responses to solar forcing: t1 1⁄4 0:470:1yr and t2 1⁄4 872yr or t2 1⁄4 1273yr. Since 1980 the solar contribution to climate change is uncertain because of the severe uncertainty of the total solar irradiance satell...

The present work concerns the activity performed to upgrade an in house finite volume CFD solver for computing heat transfer in gas turbine cooling devices. The “conjugate simulation” of fluid heat transfer and metal heat conduction has been considered. To this aim the original code has been coupled to a new one solving the Fourier equation in the solid domain. This modification allows the “con...

This thesis presents the development of integrated silicon photonic devices. These devices are compatible with the present and near future CMOS technology. High-k horizontal grating couplers and waveguides are proposed. This work consists of simulations and device design, as well as the layout for the fabrication process, device fabrication, process development, characterization instrument deve...

A novel 16-channel optical backplane bus with volume holographic optical elements (VHOEs), operating as diffraction grating beam alignment guides, was designed and fabricated for a high-performance computing system multi-slot bus. These thin film VHOEs were fabricated to diffract light beams for each bus slot into a glass wave-guiding plate (refractive index 1.52) for total internal reflection ...

Experiments were performed to investigate single-phase heat transfer from a smooth 12.1'x 12.7 mm simulated chip to a two-dimensional jet of dielectric Fluorinert FC-72 liquid issuing from a thin rectangular slot into a channel confined between the chip surface and nozzle plate. The effects of jet width, confinement channel height, and impingement velocity have been examined. Channel height had...