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Lect 10 rate processes

# Lect 10 rate processes - L ectur e 10 Rate Pr ocesses M at...

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Lecture 10 Rate Processes Material adapted 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. Understand the concept of resistance. 2
Rates Critical in Engineering Rate can be defined in two ways conceptually. Rate, r, is the amount a quantity changes per unit time. t time in Change N Quantity in Change t Δ N Δ r Rate = = =

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Flow Rate Flow rate, r, is the amount of quantity N that flows by a point in a given length of time. Examples: volumetric flow rate, rate of energy, current t N r = = Rate Flow
Water Filling a Tank The volume in the tank changes at a rate, r 1 . The water goes past the pipe outlet at flow rate , r 2 . For this case, because there is no outlet in the tank, the volume changes at the same rate as the water flows in, thus r 1 = r 2 = r.

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