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From Chemepedia

Welcome to ChempediA

A resource dedicated to the teaching of transport phenomena at the University of South Florida

This site has emerged as a collaboration with students to present material in a manner that facilitates learning

Transport Phenomena Modules
Introduction to Transport Phenomena
Microscopic balances describe velocity, temperature, and composition profiles

The general microscopic balance gives point-to-point variations of a transport quantity. The following are the specialized versions of the general microscopic equation:

Macroscopic balances
  • General macroscopic balance
    • Mass balance: Describes the relationship between mass accumulation in a system with fluid flow.
    • Momentum balance: Describes the forces on a system due to fluid flow.
    • Total energy balance: Describes the energy accumulation in a system. This balance is rarely used as it involves both mechanical and thermal energy terms.
      • Mechanical energy balance: A subset of the total energy balance. Describes the relationship between mechanical terms in the total energy balance (pressure, velocity, and height) in fluid flow.
      • Internal energy balance: A subset of the total energy balance. Describes the relationship between thermal terms (temperature) and heat transfer in fluid flow.
Do you know where dimensionless numbers come from?

Dimensionless numbers arise naturally in transport phenomena, and they usually represent the relative importance of forces or transport timescales. They are used to simplify microscopic and macroscopic balances. They are also used in the development of correlations for macroscopic analysis.