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Experimental and numerical fluid dynamics analysis of confined parallel jets

Inzoli Fabio
Riccardo Mereu
Group: Mono and Multiphase thermofluid dynamics

The confined-parallel-jet configuration is common in several industrial systems, such as HVCA, nuclear reactors (steam generator), cooling systems for electronic components, etc. Distribution and stability of the jets influence the fluid dynamics and thermal performances (pressure drop and heat transfer) of the whole system. Experimental methods such as LDV (Laser Doppler Velocimetry) and PIV (Particle Image Velocimetry) are used for measuring fluid velocity in single points and visualizing the velocity field in a plane, respectively. Numerical modeling of confined turbulent flows is widely investigated in research communities and utilized in industrial field. LES and URANS approaches are nowadays used to simplified and real industrial applications, respectively. Numerical investigations need to follow a qualified approach requiring application of best practices and software recommendations (e.g. the Q3 approach including the three interdependent, but related, dimensions: software reliability, user knowledge and process control). A coupled experimental and numerical campaign represents nowadays an approach permitting to validate the numerical results with experimental data and to increase the understanding of the phenomenon by using numerical information at the same time. Furthermore a validated numerical approach can be used at different operating conditions and geometries to limit time and costs. Research goal: Definition of an experimental data set for a 5-jet facility at different operating conditions and validation of its CFD modeling carried out by using the CFDLab protocol based on the Q3 approach. Activities: Literature review of experimental and numerical studies of parallel jets. Experimental campaign with PIV and LDV techniques at different Reynolds numbers and geometrical configurations Numerical simulation with CFD URANS and LES methods