Basics 2 min read
Variation in area for isentropic flow
In many engineering devices used in the natural gas industry, the flow of a gas may be either accelerated or…
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Basics 1 min read
Critical flow variables
For compressible flows two regions of different behavior can be recognized depending on the Mach number. If the flow velocity…
Advanced Concepts 2 min read
Dynamical similarity of ideal gas flows
The non-linear nature of Euler’s equation may cause serious mathematical difficulties when solving a problem on the flow of ideal…
Advanced Concepts 1 min read
Small perturbations at the speed of sound
In a great number of engineering problems one is interested in the perturbation of a given flow. The motion of…
Advanced Concepts 1 min read
The Vazsonyi-Crocco equation
Now we shall determine the relationships between the kinematic and thermal variables for an ideal perfect gas flow. We restrict…
Basics 1 min read
The law of conservation of energy for perfect fluid flow
It was previously shown, that the Bernoulli equation expresses the conservation of mechanical energy for the flow of a perfect…
Basics 1 min read
Kelvin’s vortex theorem
As it is known, circulation around any closed curve in the fluid is defined by the Integral An important consequence…
Basics 2 min read
Simple applications of the Bernoulli equation
There is a rather large range of problems in fluid mechanics to which the perfect fluid model can be successfully…
Basics 3 min read
The Bernoulli equation
The Bernoulli equation is the first line integral of the equation of motion. The equation can take various forms, depending…
Basics 2 min read
The perfect fluid
The fundamental property which distinguishes a fluid from other continuous media is that it cannot be in equilibrium in the…
