Rayleigh-Sousselier theory

Rayleigh–Sousselier theory describes the cooling process of hot gases flowing through a nozzle or a jet. It explains how the gas cools and contracts as it expands rapidly, which affects its speed and pressure. Essentially, it models how energy is transferred during rapid expansions, such as in rocket engines or jet propulsion. The theory helps engineers predict how gases behave under high-speed conditions, ensuring efficient design of propulsion systems. It combines principles of fluid dynamics and thermodynamics to better understand how temperature, pressure, and velocity change during expansion.