What do you mean by a super saturated flow?

The steam in such a set of conditions, is said to be supersaturated or in metastable state. It is also called super cooled steam ,as its temperature at any pressure is less than the saturation temperature corresponding to the pressure.

What is super saturated flow and its effect explain with sketch?

The effect of supersaturated is to reduce the heat drop slightly during the expansion and consequently a corresponding reduction in final velocity. The final dryness fraction and the entropy also increased and the measured discharge is greater than that theoretically calculated.

Which term is related to supersaturated flow of nozzle?

Explanation: Metastable expansion of steam produces a supersaturated state where steam is undercooled to a temperature less than that corresponding to its pressure. It has been observed after a series of experiments that discharge through the nozzle is increased as the density is increased.

Why supersaturated phenomenon occurs in nozzle and what are its effects?

The supersaturation phenomenon occurs in the nozzle due to delay in condensation as a result of which mass flow rate coming from the nozzle is more than the designed value. The expansion of superheated stem from pressure P1 to Pb is represented by the line AB.

What is degree of undercooling in nozzle?

degree of undercooling – – is the saturation temperature at. = Supersaturated steam temperature at point 3 which is the limit of supersaturation.

What is the purpose of steam turbine governing?

Explanation: The primary objective of steam turbine governing is to maintain a constant speed at varying loads. That means, irrespective of the load that is developed in the turbine, the speed remains a constant.

What is the effect of friction on the flow through a steam nozzle?

in case of nozzle, friction will decrease the motion of flow, that is friction will decrease the velocity of floor. as a result, actual velocity of flow would be less than theoretical velocity of flow through nozzle.

What are the effects of super saturation on discharge and heat drop?

Thus the effect of supersaturation is to reduce the enthalpy drop slightly during the expansion and consequently a corresponding reduction in final velocity. The final dryness fraction and entropy are also increased and the measured discharge is greater than that theoretically calculated.

Where the flow of steam is supersonic?

As the gas passes through the throat, it attains sonic velocity (Mach number = 1). As the gas passes through the divergent nozzle, the velocity increases to supersonic (Mach number >1) The flow rate is maximum for a given nozzle if the flow is sonic at the throat….4.6.

What are the effects of supersaturation?

What is supersaturation with respect to expansion of steam?

Supersaturation, or the failure of steam to condense when the saturated condition is reached in an expansion, has long been a matter of interest to engineers.

What is degree of undercooling?

Undercooling could be measured as the temperature difference between the melting temperature and the solidification temperature. Finally, the system was shut down when the temperature went below 1273 K.