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In order that no shock wave develops when the flow is taking place through a converging-diverging tube, Mach number at exit should be:

In order that no shock wave develops when the flow is taking place through a converging-diverging tube, Mach number at exit should be: Correct Answer greater than 1

Concept:

Shock waves are generated which are very small regions in the gas where the gas properties change by a large amount. Across a shock wave, the static pressure, temperature and gas density increases almost instantaneously.

If the shock wave is perpendicular to the flow direction it is called a normal shock.

A design condition is a condition for which backpressure is equal to the pressure at the nozzle exit. In this case, back pressure changes and weakens the wave pattern, and the waves in the jet disappear altogether, and the jet will be uniformly supersonic.

For no shock wave, the Mach number should be greater than 1.

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