Flow Dynamics and Thermodynamics — Lesson 4

This lesson covers the fundamental concepts of flow dynamics and thermodynamics. It explains the steady flow energy equation and its application in deriving the expression for stagnation temperature. The lesson also discusses the effects of heat addition and removal, work addition and removal on the stagnation temperature. It further elaborates on the concept of adiabatic flow and how it can change the stagnation state. The lesson also highlights the importance of stagnation pressure and its correlation with the presence of irreversibilities in the flow. The lesson concludes with a detailed explanation of how to depict states and processes in a TS or PV diagram, and how to determine whether a given state is subsonic or supersonic.

Video Highlights

01:53 - Concept of stagnation pressure loss
06:14 - Discussion on the slope of isobars and isochores in a TS diagram
10:36 - Discussion on how to depict subsonic and supersonic states in a TS or PV diagram
23:59 - Explanation of how to depict states in a HS diagram for real gases

Key Takeaways

- The steady flow energy equation is used to derive the expression for stagnation temperature.
- The stagnation temperature increases with heat addition and decreases with heat removal.
- In an adiabatic flow, the stagnation state can be changed by adding or extracting work from the flow.
- Any loss of stagnation pressure indicates the presence of irreversibilities in the flow, leading to entropy generation.
- The TS or PV diagram can be used to depict states and processes, and to determine whether a given state is subsonic or supersonic.