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Mass+transfer+_+Hemodialysis+Lecture-Allie-2_27_12

# Mass+transfer+_+Hemodialysis+Lecture-Allie-2_27_12 - Mass...

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2/24/2012 1 Mass Transfer & Dialysis Allison Hoch 27 February 2012 Fluid Dynamics vs. Electrical Engineering 2 Electrical : V=IR Fluids : Δ P=QR 𝑅 ?𝑒?𝑖𝑒? = 𝑅 1 + 𝑅 2 + ⋯ 𝑅 ? 1 𝑅 ?𝑎?𝑎??𝑒? = 1 𝑅 1 + 1 𝑅 2 + ⋯ 1 𝑅 ? Series Δ P=QR Parallel http://physics.bu.edu/py106/notes/Circuits.html

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2/24/2012 2 Fluid Dynamics vs. Electrical Engineering 3 For a flat-plate dialyzer, the mass transfer coefficient (k o ) is derived from: dialysate conductivity, blood conductivity, and membrane permeability in SERIES . Why then, does the equation look like: 𝑅 ?𝑒?𝑖𝑒? = 𝑅 1 + 𝑅 2 + ⋯ 𝑅 ? 1 𝑅 ?𝑎?𝑎??𝑒? = 1 𝑅 1 + 1 𝑅 2 + ⋯ 1 𝑅 ? 1 𝑘 ? = 1 𝑘 𝐷 + 1 𝑘 𝐵 + 1 𝑃 ? Fluid Dynamics vs. Electrical Engineering 4 𝑅 ?𝑒?𝑖𝑒? = 𝑅 1 + 𝑅 2 + ⋯ 𝑅 ? 1 𝑅 ?𝑎?𝑎??𝑒? = 1 𝑅 1 + 1 𝑅 2 + ⋯ 1 𝑅 ? 𝑑𝑀 𝑖 = 𝑘 0 𝐶 𝑖𝐵 − 𝐶 𝑖𝐷 𝑑𝐴 ? 𝑑𝑀 𝑖 𝑑𝐴 ? = 𝑘 0 𝐶 𝑖𝐵 − 𝐶 𝑖𝐷 Q = Δ P/R flow pressure resistance Thus, our R=1/k 0 Fluids : Δ P=QR
2/24/2012 3

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