When the steam dryness is high, the fluid behaves as a homogeneous flow

It is generally believed that the dryness of steam is higher (^;&95^> when the fluid behaves as a homogeneous flow. Temperature and pressure compensation can be carried out according to the usual method; however, certain errors occur. In style. ^),. It is the density of the actual fluid wet saturated steam, its value is larger than that of the critical saturation state, and the lower the dryness, the greater the density. However, what people find out based on the pressure is the density of the critical saturation state, which is smaller than the actual density, so there is a negative error in the mass flow calculation result. In the case where humidity is not measured, X is an unknown, so how much lower the measurement is is unknown. When the steam dryness is low (meaning ^^^^), the fluid in the pipeline will flow in layers, resulting in larger errors. Wet saturated steam turns into superheated steam. Wet saturated steam turns into superheated steam, which usually occurs when the wet saturated steam is decompressed suddenly and the fluid appears adiabatic expansion. ①Phase change process. The steam and water droplets in the wet saturated steam are in the state of gas-liquid phase equilibrium. When the pressure suddenly drops below the equilibrium pressure, the water droplets partially evaporate, and at the same time absorb the heat of vaporization from the liquid and gas phases, reducing the temperature of the gas-liquid phase. If the temperature is not lowered much or the humidity is higher before evaporation, the temperature will drop rapidly to the saturation temperature corresponding to the new pressure, and a new equilibrium will be established. At this time, the steam is still wet saturated steam.