Lecture1-2 - wb3419-03 Characterization and Handling of...

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
wb3419-03 Characterization and Handling of Bulk Solids - 2009/2010 1 15/09/2009 1 Silo’s and Flow Theory Lecture 1-2 Prof. Dr. ir. G. Lodewijks & Dr. Ir. Dingena Schott 15/09/2009 2 Learning Objectives Describe and explain the fundamental difference between a fluid and particulate material. Describe the advantages/disadvantages of transport equipment (here: silo types) Describe and explain stresses and flow in a silo
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
wb3419-03 Characterization and Handling of Bulk Solids - 2009/2010 2 15/09/2009 4 Contents lecture 1.2 1. Bulk solid material flow patterns 2. Stresses and flow in a silo 15/09/2009 5 1. Bulk solid material flow patterns
Background image of page 2
wb3419-03 Characterization and Handling of Bulk Solids - 2009/2010 3 15/09/2009 6 Mass flow A c t i v e F l o w C h a n Core flow Expanded flow 15/09/2009 7 Flow modes of bulk solid materials in a silo are Mass Flow all the material in the hopper is in motion, but not necessarily at the same velocity Core or funnel Flow centrally moving core, dead or non-moving annular region Expanded Flow mass flow cone with funnel flow above it
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
wb3419-03 Characterization and Handling of Bulk Solids - 2009/2010 4 15/09/2009 8 15/09/2009 9 + flow is more consistent + reduces effects of radial segregation + stress field is more predictable + full bin capacity is utilized + first in/first out - wall wear is higher (esp. for abrassive materials) - higher stresses on walls - more height is required Mass flow – pros and cons
Background image of page 4
wb3419-03 Characterization and Handling of Bulk Solids - 2009/2010 5 15/09/2009 10 + less height required - ratholing - a problem for segregating solids - first in/last out - time consolidation effects can be severe - silo collapse - flooding - reduction of effective storage capacity Funnel flow – pros and cons 15/09/2009 11 To Flow or not to Flow, that is the question! General problems include: 1. Ratholing/piping 2. Core flow 3. Bridging/arching 4. Inadequate emptying 5. Insufficient flow 6. Flushing 7. Mechanical arching 8. Time consolidation - caking
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
wb3419-03 Characterization and Handling of Bulk Solids - 2009/2010 6 15/09/2009 12 1. Ratholing 3. Bridging 2. Core flow 15/09/2009 13 4. Inadequate emptying
Background image of page 6
Image of page 7
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 19

Lecture1-2 - wb3419-03 Characterization and Handling of...

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online