Lect 11 rate processes_2_

Lect 11 rate processes_2_ - Rate Processes - Part 2 Lecture...

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Rate Processes - Part 2 Lecture Material taken from TAMU
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Objectives Know the definitions of and the relationships between rate, flux, and driving force. Define the proportionality constants for heat, fluid flow, electricity, and diffusion problems. Know how to compute the rate and flux for heat, fluid flow, electricity, diffusion problems. 2
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Flux and Driving Force Driving Force is a potential that can result in a flux (i.e., an influence that can cause a change). Driving force, D, is the gradient causing flux. Distance, x, is position over which driving force applied. x D distance gradient Δ K K tA N A r J = = = = Proportionality Constant
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Four Common Fluxes Quantity, N Driving Force, D Heat Temperature Fluid Volume Pressure Charge Voltage Mass of Chemical Species Concentration
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Proportionality Constants Driving Force, D Proportion Constant Temperature (T) Thermal Conduct. (k) Pressure (P) Viscosity (8 πμ /A) Voltage (V) Electrical Conduct. (K) Concentration (C) Diffusivity ( ) δ
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Lect 11 rate processes_2_ - Rate Processes - Part 2 Lecture...

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