Chapter 15 Flashcards
What are the two options that lead molecular movement to mass transfer ?
Diffusion & Convection
What is Diffusion?
Particles move from one to another on a molecular level.
What is convection?
Δ P driving force - physically moving particles by force.
What leads to mass transfer?
Molecule collisions with container.
What is individual particles and collision behavior called?
Microscale
What is the cause of particles spreading out to minimize collision?
Macroscale
As_____ is applied particles _____ energy & want to __________, but can only go so far and so fast before they hit something.
Heat
Gain
Accelerate
As gases are _____ spread out it means it can _____ more speed before a collision, thus having ______ diffusion _____.
More
Gain
Higher
Rates
What is Fickcain Model of Diffusion?
Transfer of dilute solutes in physiological fluids.
What is the thermal diffusion formula?
α(thermal)= (Qz/A) / d[ (ρCpT) / dz ]
What is the formula for diffusivity?
Da,b= -Ja,z/ (ΔC/ΔT)
What is the mass balance equation at steady state?
In=Out
What is the formula for diffusion coefficient formula?
(J*L) / (ΔC)
What are the two types of convection?
Force convection & Natural convection
Ex. Molecules diffusing in your body (sugar, protein, whatever) while you’re walking.
Diffusion is ________ __ ___ ______ + Convection _______.
Molecules in our bodies
walking
