Lecture 26.pptx - Lecture 26 CBE 218 Fluid Mechanics...

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Lecture 26 CBE 218 Fluid Mechanics April 15, 2015
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Chapter 11 Flow through porous media 11.1 Fluid friction in porous media 11.2 Two-fluid concurrent flow in porous media 11.3 Countercurrent flow in porous media 11.4 Filter theory 11.4.1 Surface filter 11.4.2 Depth filters 11.5 Fluidization Expected outcome Predict the pressure drop or friction loss of a flow through a packed column or other porous media and can describe the processes of fluidization and pneumatic transport.
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Interconnected pores vs non-interconnected pores Closed pores- expanded polystyrene hot drink cups (Excellent barriers for fluid flow) No interconnected pores- impermeable to fluid flow Open porosity or interconnected pores- a pile of sand Permeable to fluid flow 1 2 F B.E. For porous medium 1) Friction term will be more significant 2) For porous medium flow V2 will not be equal to V1 but ∆V 2 will be negligible as compared with F 3) Displacement of air in case of porous medium? 2 2 V z g
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11.1 Fluid friction in porous media Superficial velocity = Vs = Q/A pipe = ṁ/ρA pipe Interstitial velocity = V I = Q/εA pipe = ṁ/ερA pipe Porosity or void fraction = ε = ( total volume of system – volume of solids in system)/total volume of system P1 P2 ∆x
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