week # 5 mr chapter 6 fluid flow through a packed bed of particles
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Tutorial # 5 MR #6.1, 6.3, 6.5, 6.7, To be discussed on Feb. 19, 2014. By either volunteer or class list. Week # 5 MR Chapter 6 Fluid Flow Through a Packed Bed of Particles. - PowerPoint PPT PresentationTRANSCRIPT
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Week # 5MR Chapter 6
Fluid Flow Through a Packed Bed of Particles
• Tutorial # 5• MR #6.1, 6.3, 6.5, 6.7,
• To be discussed on Feb. 17, 2016.• By either volunteer or class list.
MARTIN RHODES (2008) Introduction to Particle Technology , 2nd Edition. Publisher John Wiley & Son, Chichester, West Sussex, England.
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Pressure drop-flow relationship
/U Ui Tube equivalent diameter:
Hagen-Poiseuille:
Laminar flow:
2eH K H
Flow area = A; wetted perimeter = SBA;SB: Particle surface area per unit volume of the bed.Total particle surface area in the bed = SBAH
For packed bed, wetted perimeter = SBAH/H = SBA
Darcy (1856)
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Carmen-Kozeny eq:.
Turbulent flow:
(1 )v BS S
A
Sv = 6/x
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General equation for turbulent and laminar flow
Ergun eq.
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Non-spherical particles
Friction factor versus Reynolds number plot for fluid flows
through a packed bed of spheres
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Filtration
• Incompressible cake
(Eq. 6.21, See Appendix 5 for derivation )
(From Ergun equation)
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• Constant pressure drop filtration
• Including the resistance of the filter medium
(Eq. 6.23, see Appendix 5 for derivation )
(Eq. 6.27, see Appendix 5 for derivation )
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Washing the cake
Removal of filtrate during washing of the filter cake
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Compressible cake
Analysis of the pressure drop-flow relationship for a compressible cake
rc = rc(ps)
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xsv = 792 m.
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