| Gas Dynamics |
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Gas dynamics is a branch of fluid mechanics which deals with Compressible Flow . The unique aspects of gas dynamics include two phenomena that do not appear in other branches of fluid mechanics. These phenomena are waves (normal shocks , Oblique Shock and expansion waves) and choking flow (isentropic, isothermal choking). A parallel to the shock seen in gas dynamics is the Hydraulic Jump witnessed in open-channel Incompressible Flow . Nevertheless, the shock in many aspects which don't appear in the hydraulic jump, e.g. oblique shock. Choking occurs when there is a disparity between the area difference of the nozzle and the throat and the pressure drop between the inlet and outlet, causing the creation of a shock wave before the outlet to make up for that difference. Study of gas dynamics involves,
HISTORY Gas dynamics became important during World War II due to its potential military applications. Other applications include manufacturing ( Die Casting ), and a myriad of other possibilities including the expansion of the gas that occurs when an airbag inflates in a motor vehicle. Many of the basic physical understandings were achieved 1940-1960 after which it became classical material. Yet many of the mathematical underline of the many principles were achieved only in this millennium e.g. oblique shock, moving shock. SEE ALSO Important concepts Flows of interest
Experimental techniques
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