Dr. Marc Madou, UCI, Winter 2015 Class IV Transport in Electrochemistry (II) Electrochemistry MAE-212.
Dec 24, 2015
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- Slide 1
- Dr. Marc Madou, UCI, Winter 2015 Class IV Transport in Electrochemistry (II) Electrochemistry MAE-212
- Slide 2
- Table of Content Reynolds Numbers Low Reynolds Numbers OHP, Diffusion Layer Thickness, Hydrodynamic Boundary Layer Thickness Mixing in low Reynolds number fluids to enhance electrochemical reactions
- Slide 3
- Reynolds Numbers The dimensionless Reynolds number is given by: where v is the mean velocity of an object relative to the fluid (SI units: m/s), L is a characteristic linear dimension (SI: m), is the dynamic viscosity of the fluid [SI: Pas or Ns/m or kg/(ms)] and is the kinematic viscosity ( : / ) (m/s) and is the density of the fluid (SI: kg/m) Note that multiplying the Reynolds number by yields: which is the ratio of: Or also:
- Slide 4
- Small systems are less turbulent than large ones (e.g., flow in very thin pipes is laminar). Slow flows are laminar, while fast flows are turbulent. More viscous materials are less turbulent (e.g., oil in a pipeline is less turbulent than water in the same pipeline). Reynolds Numbers
- Slide 5
- Low Reynolds Numbers Creeping flow also known as Stokes Flow or Low Reynolds number flow Occurs when Re
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