# Result Table - Abrupt Size Change

The available results that are listed in the table vary depending upon the fluid phase state and upon the visible properties that you have selected. Figure 1 shows a selection of the available results for a liquid phase state. You can choose the rows you wish to display in the results table via the Set Visible Results Dialog. Figure 1: Available results for an Abrupt Size Change Element. Only descriptions for the relevant results are shown in this section. If you wish to see the definition for other values click here. -- ID -- (aka User Number): All flowsheet elements have a unique number that is assigned by FluidFlow. It is not possible for the user to change this number because it is used as a unique identifier by the scripting module. Node numbering starts from 1, incrementing upwards, and pipe numbering starts from -1, decrementing downwards. Composition Mass %: This is the fluid mass composition that remains constant throughout the element. FluidFlow determines the composition because an individual component mass balance is carried out at each node. Flow: This is the flow through the "Abrupt Size Change" element that FluidFlow has calculated. In Stagnation Pressure: The stagnation pressure at the "Abrupt Size Change" element inlet. This is the sum of kinetic and pressure energies (static pressure + velocity pressure). Stagnation pressure is the pressure a flowing fluid would rise to if brought isentropically to rest, converting its kinetic energy to enthalpy. Stagnation pressure is a measure of the usefulness of the gas's energy. In Stag. Temperature: This is the stagnation temperature at the "Abrupt Size Change" element inlet. The stagnation temperature is the temperature that the fluid would reach if it were brought to rest isentropically, converting its kinetic energy to enthalpy. In Static Pressure: This is the pressure that acts equally in all directions at the point in the fluid and is present irrespective if the fluid is flowing or if the fluid is at rest. The pressure inside any "Abrupt Size Change" element is not the static pressure, unless there is no flow. Stagnation pressure is the flowing pressure. In Static Temperature: The static temperature at the "Abrupt Size Change" element inlet. Static temperature is related to stagnation temperature (ignoring work, heat exchange, and potential energy) by the equation T 1 = T 1 0 - 0.5v 1 2 / C p In Velocity: The velocity at the "Abrupt Size Change" element inlet. For gases, velocity increases as the fluid moves across the element. This can also occur with two phase flow where flashing exists, or for an incompressible fluid where the temperature rises. Velocity can also decrease as a fluid flows across an element, for example cooling of a liquid. Joule–Thomson Coefficient: The Joule–Thomson effect describes the increase or decrease in the temperature of a gas when allowed to expand. The change in temperature (T) with a decrease of pressure (P) at constant enthalpy (H) is referred to as the Joule–Thomson coefficient (μJT). FluidFlow uses the Peng Robinson EOS to evaluate the Joule–Thomson coefficient which is expressed as: μJT = (∂T/∂P)H The value of μJT is typically expressed in °C/bar and is dependent on the physical properties of the gas, as well as the temperature and pressure of the gas before expansion. K Value: This represents the Pressure Loss Coefficient (K) which has been automatically back-calculated by the software using the equation: K = 2 ΔP/ρv2 Out Stagnation Pressure: The stagnation pressure at the "Abrupt Size Change" element outlet. This is the sum of kinetic and pressure energies (static pressure + velocity pressure). Stagnation pressure is the pressure a flowing fluid would rise to if brought isentropically to rest, converting its kinetic energy to enthalpy. Stagnation pressure is a measure of the usefulness of the gas's energy. Out Static Pressure: This is the pressure that acts equally in all directions at the point in the fluid and is present irrespective if the fluid is flowing or if the fluid is at rest. The pressure inside an "Abrupt Size Change" element is not the static pressure, unless there is no flow. Stagnation pressure is the flowing pressure. Out Velocity: The velocity at the "Abrupt Size Change" element outlet. For gases, velocity increases as the fluid flows across the "Abrupt Size Change" element. This can also occur with two phase flow where flashing exists, or for an incompressible fluid where the temperature rises. Velocity can also decrease, for example cooling of a liquid. Out Stag. Temperature: This is the stagnation temperature at the "Abrupt Size Change" element outlet. The stagnation temperature is the temperature that the fluid would reach if it were brought to rest isentropically, converting its kinetic energy to enthalpy. Out Static Temperature: The static temperature at the element outlet. Static temperature is related to stagnation temperature (ignoring work, heat exchange, and potential energy) by the equation T 2 = T 2 0 - 0.5v 2 2 / C p Total Pressure Loss: This is the calculated total pressure loss. Total pressure loss is not always the same as frictional loss, for example, when a temperature or velocity change occurs. In FluidFlow total pressure loss is defined (from the Energy Equation) as: DP = (z 1 r 1 g + p 1 + 0.5r 1 v 1 2) - (z 2 r 2 g + p 2 + 0.5r 2 v 2 2)