Course Outcomes

Note: Book Chapters that correspond to the listed course outcome(s) are provided in square brackets [].

Introduction to Transport Processes

Transport Phenomena refers to the study of the motion and balance of momentum, heat, and mass in engineering problems. These three modes of transport are studied concurrently for several reasons: they have similar molecular origins, they yield similar governing equations/principles, they often occur simultaneously, and they require similar mathematical/conceptual tools.

In this section we define and introduce several conceptual tools necessary for studying transport, and answer several pertinent engineering questions:

What are my options in visualizing/conceptualizing the movement of momentum, heat, mass?

By what underlying mechanisms does this transport take place? [Ch 3.1]

What global understanding of the problem can be achieved through simple reasoning?

Linear Transport Relations

Much of Transport Phenomena deals with the exchange of momentum, mass, or heat between two (or many) objects. Often, the most mathematically simple way to consider how and how fast exchanges take place is to look at driving forces and resistances.

In momentum transport, we are interested in driving forces that arise from differences in pressure and/or velocity.

In heat and mass transport, our driving forces arise from differences in concentration and temperature.

Constitutive Laws

The mathematical analysis of the diffusion of heat, mass, or momentum is incorporated into constitutive laws that relate this diffusion to easily measurable quantities (like temperature, velocity (pressure), and concentration).

A microscopic or continuum description of transport requires that we examine "diffusion" of our conserved quantities at the molecular level.

Analyzing Mass and Heat Transfer Equipment

Scaling up to solving problems using process equipment requires both continuum and macroscopic knowledge of transport, and is industrially quite significant.

Elementary Non-Steady Phenomena

Because Transport deals with rates it is often the case that we must consider non-steady (or transient) operation (when the rates do not exactly cancel). In this section, we examine scalar transport (heat and mass transfer) where some non-steady problems can be simplified significantly.

Shell/Integral Balances

Shell or integral (macroscopic) balances are often relatively simple to solve, both conceptually and mechanically, as only limited data is necessary. At the same time, many problems require only the level of detail that may be extracted from these types of balances and thus they represent powerful tools.

Differential Balance Equations

Differential balances, although more complex to solve, can yield a tremendous wealth of information about ChE processes. General balance equations for each of the modes of transport can easily be derived either directly from shell balances or via control volume analysis. Understanding the origin and meaning of the terms that make up these balance equations lies at the heart of posing and solving complex transport problems.