BOCANEGRA J. A.

In this paper, an experimental study regarding the natural circulation in connected vertical rectangular loops is presented. Typically, the geometry of the natural circulation loops (NCL) is rectangular or toroidal and the analysis is focused on the thermo-hydraulic behaviour of a single working loop. In this study, a new approach referred to...

Heat transfer measurements were taken during nucleate pool boiling of FC-72 (a saturated liquid utilized for thermal control of electronic components) from extended finned surfaces placed in a horizontal channel. The influence of channel width on boiling behavior for various extended finned surfaces was experimentally investigated. These finned...

Lattice Gas Automata (LGA) has emerged as a numerical technique based on the propagation and interaction of particles in a lattice. In the Computational Fluid Dynamics field, the Lattice Gas Automata is considered the precursor of the popular Lattice Boltzmann Method. Recognized for its parallelization capabilities and original mesoscopic...

No description

The Lattice Boltzmann Method (LBM) can be applied to several fluid dynamic problems in the time domain. This numerical method indirectly solves the Navier–Stokes equations in a weakly compressible limit that allows acoustic wave propagation. This work presents a systematic literature review concerning the application of the LBM in acoustics....

A magnetic structure intended for use in a room-temperature rotary active magnetic regenerator (AMR) is presented, under construction at the University of Genoa. Given the overall size of the regenerator and the thickness of the gap, the magnet design is optimized to produce the highest possible magnetic field difference between two adjacent...

Green roofs, also known as vegetated roofs or living roofs, have gained increasing attention in recent years due to their potential to address various environmental challenges in urban areas. These innovative roofing systems offer a promising solution to mitigate urban heat island effects, manage stormwater runoff, reduce energy consumption,...

Magnetic refrigeration is becoming increasingly relevant as a means to achieve sustainability in refrigeration, thanks to its durability, efficiency, and low environmental impact. This paper regards the design of a new rotary magnetic refrigerator feasible for domestic use at room temperature. An interdisciplinary approach was necessary to...

A key component in acoustic refrigerators and engines is the stack, a porous material strategically placed within a tube to harness the thermoacoustic effect. 3D printing technology for stack construction is promising due to its ability to provide accurate geometry control. One potential application is the construction of modular stacks, which...

Innovative materials to accomplish thermal and sound insulation are constantly emerging from the industry. In this paper one of those innovative materials, mainly destinated to applications in environments such as yachts and ships, is characterized by means of a three-microphones impedance tube. In this way, acoustical and non-acoustical...

Polyimide foam panels have emerged as advanced solutions in naval, nautical, aeronautical, and railway industries, overcoming limitations associated with the high densities and thicknesses of traditional thermal and acoustic insulation materials. This study aims to experimentally characterize the sound absorption coefficient of both standard...

Scaled models are implemented to study the radiated noise from the ships' propellers. Typically, acoustic measurements are performed inside a cavitation tunnel using those scaled models of the propeller. This work aims to present a modal acoustic characterization of the cavitation tunnel of the DITEN department of the University of Genoa in the...

Understanding the specific characteristics of onboard noise can significantly benefit human activity in different kinds of ships. Here, the perceived noise can significantly change from space to space in terms of both levels and frequency content, depending on location onboard in respect to the primary sources and on propagation paths....

The noise radiated by ship propellers can be studied by analyzing scaled models in a cavitation tunnel. However, transferring the measurements made in the enclosed space of the tunnel to the expected values in a full-scale propeller (in a free field) presents a challenge for noise measurements. An acoustic characterization of the DITEN...

Commercial ports, characterized by intense human activity, are susceptible to elevated noise levels, with ships being significant contributors to the complex acoustic environment. During ship manoeuvres, specific port zones are directly exposed to noise, potentially impacting both workers and nearby residential areas. The CLASTER project, a...