Quality Results for Two-Phase Fluids in Flownex
What do negative quality results or quality results with values of 100 or 1000 mean?
This article provides more information regarding the different quality results calculated for two-phase fluids in Flownex® for different regions.
QUALITY RESULTS FOR DIFFERENT REGIONS FOR A TWO-PHASE FLUID
Generally, the quality (x) of a two-phase fluid is a value of 0 for a saturated liquid, a value of 1 for a saturated vapour and a value between 0 and 1 when the fluid is in the two-phase region. Flownex® also provides specific quality results for the subcooled, superheated, supercritical and gas-only regions. These regions are shown in Figure 1, and the related quality results will be described in more detail below.
QUALITY RESULTS FOR SUBCOOLED AND SUPERHEATED TWO-PHASE FLUIDS IN Flownex®
Quality results in Flownex® will be less than 0 (x < 0) or above 1 (x > 1) if the fluid is in the subcooled or superheated region.
If the two-phase fluid is subcooled, a negative quality result (x < 0) is used to indicate to the user to which extent the two-phase fluid is subcooled.
If the two-phase fluid is superheated, a quality result above 1 (x > 1) is used to indicate to the user to which extent the fluid is superheated.
QUALITY RESULTS FOR SUPERCRITICAL TWO-PHASE FLUIDS IN Flownex®
If the pressure is higher than the critical pressure of the two-phase fluid, the fluid will be considered supercritical. The quality result for a supercritical two-phase fluid in Flownex® will be given a value of 1000.
QUALITY RESULTS FOR GAS-ONLY TWO-PHASE FLUIDS IN FLOWNEX®
If the pressure is lower than the triple point pressure of the two-phase fluid, the fluid will only exist as a gas, and the quality result in Flownex® will be given as a value of 100.
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