Topic3_MassBalances05 - TOPIC 3 The Balance Equation / Mass...

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Mass Balances Chee 223 3.1 TOPIC 3 The Balance Equation / Mass Balances – Continuity Equation
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Mass Balances Chee 223 3.2 The General Balance Equation Creation Destruction + Flow in Flow out= Accumulation Rate Equation Rate of Rate of Rate of Rate of Rate of Creation – Destruction + Flow in – Flow out= Accumulation Applicable to any extensive property: mass, energy, entropy, momentum, electric charge
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Mass Balances Chee 223 3.3 System and Control Volumes A system is defined as an arbitrary volume of a substance across whose boundaries no mass is exchanged . The system may experience change in its momentum or energy but there is no transfer of mass between the system and its surroundings. The system is “closed”. A control volume is an arbitrary volume across whose boundaries mass, momentum and energy are transferred. The control volume may be stationary or in motion. Mass can be exchanged across its boundaries. Useful in fluid mechanics
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Chee 223 3.4 Approaches for Analysis of Flow In analyzing fluid motion we may take two paths: 1. Working with a finite region (=the control volume), making a balance of flow in versus flow out and determining flow effects such as forces, or total energy exchange. This is the control volume method. This approach is also called “macroscopic” or “integral method of analysis”. 2.
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This note was uploaded on 10/18/2009 for the course CHBE 3200 taught by Professor Meredith during the Spring '08 term at Georgia Institute of Technology.

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Topic3_MassBalances05 - TOPIC 3 The Balance Equation / Mass...

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