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Similarity in confined vortex flows

Vortex flow of dissimilar fluids under conditions of exact geometric similarity using diatomic gases nitrogen and hydrogen - fluid mechanics

GAS FLOW↗

Two-axis winch installer for heavy ducts in confined space

Two-axis winching and traversing device is used for installing liquid-propellant rocket-engine fuel and liquid oxygen suction ducts between the valves and the rocket engine on a test stand. The device raises and maneuvers the duct into the required position where it can be safely installed by mechanics.

Cox, E. F.↗