IFMIF liquid Lithium Target Thermal-Hydraulic analysis, anywise performed, needs reliable evaluations, or data, about the nozzle outlet velocity profile.This velocity distribution is the initial condition of the physics of the jet. Its evolution meets the power deposition within the jet, driving this way the thermal-hydraulics of the subsystem.Fine evaluations of the nozzle outlet velocity distribution are therefore of basic importance for giving right count of every thermal-hydraulic phenomenon of the IFMIF liquid lithium jet.In absence of better evaluations ENEA analyses were based on the assumption of a calculated fully developed Prandtl-Nikuradse profile.The RIGEL code, was designed by ENEA as a problem oriented calculation tool. It includes a subroutine for building up the jet inlet section velocity profile. This routine can deal with any other velocity profile as well. Of course the code needs nothing but a single vector to be built or read: the velocity distribution. It is then quite simple to arrange in order to have the code reading whatever data as input.A recent work on IFMIF at JAERI measured exactly a nozzle outlet velocity profile and its evolution. These measures were performed in a water jet in kind of hydrodynamic similarity conditions with respect to the design flowing conditions of the IFMIF liquid lithium jet.Aim of the work to be presented is to investigate and discuss the effect of any JAERI measured velocity profile over the IFMIF liquid lithium jet critical parameters.The analysis will be centred about the question whether the variations introduced are to be considered acceptable or not.

IFMIF Liquid Lithium Target Thermal-Hydraulic Analysis Moving from an Experimental Velocity Distribution

Giusti, D.
1998-04-07

Abstract

IFMIF liquid Lithium Target Thermal-Hydraulic analysis, anywise performed, needs reliable evaluations, or data, about the nozzle outlet velocity profile.This velocity distribution is the initial condition of the physics of the jet. Its evolution meets the power deposition within the jet, driving this way the thermal-hydraulics of the subsystem.Fine evaluations of the nozzle outlet velocity distribution are therefore of basic importance for giving right count of every thermal-hydraulic phenomenon of the IFMIF liquid lithium jet.In absence of better evaluations ENEA analyses were based on the assumption of a calculated fully developed Prandtl-Nikuradse profile.The RIGEL code, was designed by ENEA as a problem oriented calculation tool. It includes a subroutine for building up the jet inlet section velocity profile. This routine can deal with any other velocity profile as well. Of course the code needs nothing but a single vector to be built or read: the velocity distribution. It is then quite simple to arrange in order to have the code reading whatever data as input.A recent work on IFMIF at JAERI measured exactly a nozzle outlet velocity profile and its evolution. These measures were performed in a water jet in kind of hydrodynamic similarity conditions with respect to the design flowing conditions of the IFMIF liquid lithium jet.Aim of the work to be presented is to investigate and discuss the effect of any JAERI measured velocity profile over the IFMIF liquid lithium jet critical parameters.The analysis will be centred about the question whether the variations introduced are to be considered acceptable or not.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.12079/5070
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