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Physical Modelling of Impinging Jets to aid Nuclear Sludge bed resuspension. Chetan Lakhanpal 1. 1 Institute of Particle Science and Engineering, Leeds 2 School of Earth and Environment, Leeds. Project Supervisors: Prof. Simon Biggs 1 , Prof. Mike Fairweather 1 , Dr Jeff Peakall 2. - PowerPoint PPT Presentation
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DIAMOND Decommissioning, Immobilisation and Management of Nuclear Wastes for Disposal
Physical Modelling of Impinging Jets to aid Nuclear Sludge bed resuspension
1Institute of Particle Science and Engineering, Leeds2School of Earth and Environment, Leeds
Chetan Lakhanpal1
Project Supervisors:Prof. Simon Biggs1, Prof. Mike Fairweather1, Dr Jeff Peakall2
DIAMOND Decommissioning, Immobilisation and Management of Nuclear Wastes for Disposal
Physical Modelling of an Impinging Jet on a Settled Bed
Contents
Ұ Problem Description
Ұ Project Objectives
Ұ Experimental facilities & Measurement techniques
Ұ Preliminary Work
Ұ Plans for future
Ұ Questions
DIAMOND Decommissioning, Immobilisation and Management of Nuclear Wastes for Disposal
Physical Modelling of an Impinging Jet on a Settled Bed
Problem Description
Legacy nuclear waste exist around various sites through out the world
Settling out of solid particles hinders attempts to process waste, activity may generate thermal hot spots leading to corrosion and equipment damage
Jet impingement used to re-suspend particles that form solid beds in storage ponds, tanks and silos
Re-suspension characteristics of particles never studied using appropriate simulants
Project will use experimental and numerical modelling to improve understanding and provide predictive capability for use in design, and optimisation of storage and processing arrangements
Timely given development of experimental rigs at NNL to study impinging flows of relevance to particle re-suspension in high level waste plants, and industry interest in the development of Sludge Packaging Plant No. 1, both of which use impinging jets, in the form of pulse jet mixers, for sludge mobilization
DIAMOND Decommissioning, Immobilisation and Management of Nuclear Wastes for Disposal
Physical Modelling of an Impinging Jet on a Settled Bed
Problem Description
Figure showing finned metallic container to store waste from Magnox programme
DIAMOND Decommissioning, Immobilisation and Management of Nuclear Wastes for Disposal
Physical Modelling of an Impinging Jet on a Settled Bed
Problem Description
Figure showing Magnesium Hydroxide sludge sample
DIAMOND Decommissioning, Immobilisation and Management of Nuclear Wastes for Disposal
Physical Modelling of an Impinging Jet on a Settled Bed
Problem Description
Figure showing a typical HAS tank
DIAMOND Decommissioning, Immobilisation and Management of Nuclear Wastes for Disposal
Physical Modelling of an Impinging Jet on a Settled Bed
Experimental Work
Stage 1a: Orthogonal single phase jet impingement on flat plate
Stage 1b: Comparison of results with those of other researchers
Stage 2: Dilute multi phase jet impingement on flat plate
Stage 3: Multi phase jet impingement on flat plate
Stage 4: Multi phase jet impingement on settled beds
DIAMOND Decommissioning, Immobilisation and Management of Nuclear Wastes for Disposal
Physical Modelling of an Impinging Jet on a Settled Bed
Experimental Rig
DIAMOND Decommissioning, Immobilisation and Management of Nuclear Wastes for Disposal
Physical Modelling of an Impinging Jet on a Settled Bed
Experimental Rig
Feed / over -flow tanks
DIAMOND Decommissioning, Immobilisation and Management of Nuclear Wastes for Disposal
Physical Modelling of an Impinging Jet on a Settled Bed
Measurement Techniques
Particle Image Velocimetry (PIV) Ultra Doppler Velocity Profiling (UDVP)
DIAMOND Decommissioning, Immobilisation and Management of Nuclear Wastes for Disposal
Physical Modelling of an Impinging Jet on a Settled Bed
Preliminary Work Single phase jet impingement studies
The Impingement of a jet on a flat surface
DIAMOND Decommissioning, Immobilisation and Management of Nuclear Wastes for Disposal
Physical Modelling of an Impinging Jet on a Settled Bed
Preliminary Work Single phase jet impingement studies
The Wall Jet
Poreh et al. (1961)
DIAMOND Decommissioning, Immobilisation and Management of Nuclear Wastes for Disposal
Physical Modelling of an Impinging Jet on a Settled Bed
Dye Experimentation
• To track fluid flow
• Parameters:
• Single phase, water in water
• Jet-to-plate separation = 2d
• Re = 20k
DIAMOND Decommissioning, Immobilisation and Management of Nuclear Wastes for Disposal
Physical Modelling of an Impinging Jet on a Settled Bed
Dye Experimentation
DIAMOND Decommissioning, Immobilisation and Management of Nuclear Wastes for Disposal
Physical Modelling of an Impinging Jet on a Settled Bed
Dye Experimentation VFA
a
b d
c
DIAMOND Decommissioning, Immobilisation and Management of Nuclear Wastes for Disposal
Physical Modelling of an Impinging Jet on a Settled Bed
Ultrasonic Doppler Velocity Profiling
y: vertical dist. from base; d: diameter of jet; U: velocity at a radial location; Vb: bulk velocity
DIAMOND Decommissioning, Immobilisation and Management of Nuclear Wastes for Disposal
Physical Modelling of an Impinging Jet on a Settled Bed
Ultrasonic Doppler Velocity Profiling
y: vertical dist. from base; d: diameter of jet; U: velocity at a radial location; Vb: bulk velocity
DIAMOND Decommissioning, Immobilisation and Management of Nuclear Wastes for Disposal
Physical Modelling of an Impinging Jet on a Settled Bed
Comments
• Two layer shear flow phenomena noticed on jet impingement
• Qualitative understanding gained using Dye work and UDVP
• Jet Impingement is a complex 3d flow, parameters need to be optimized for different configurations.
Reynolds number, tracer particle concentration, UVP parameters
• Good quantitative data can be obtained in far field regions using UVP
• PIV to be used for near field mapping
DIAMOND Decommissioning, Immobilisation and Management of Nuclear Wastes for Disposal
Physical Modelling of an Impinging Jet on a Settled Bed
Plans for Future
• Mean velocity and turbulence characteristics at 5d and 10d separations
• Particle Characterization Studies
• Move to multiphase jet impingement on settled beds
• Particle Size, Density, Solids Concentration, Fluid Viscosity,
Particle size distribution, Particle shape, Zeta Potential, pH,
Settling behaviour, Solids packing fraction, Yield stress
DIAMOND Decommissioning, Immobilisation and Management of Nuclear Wastes for Disposal
Physical Modelling of an Impinging Jet on a Settled Bed
Thank you for your attention.
Any questions.