Reduction


Model description

This element represents a change in the prfile, such that $A_2\lt A_1$, where as $A_1$ is the inlet area and $A_2$ the one of the outlet area. Based on VDI the pressure loss coefficient is calculated as $$\zeta=0.77\cdot \text{Re}^{-0.037}-0.4\cdot\frac{A_2}{A_1}.$$ $A_1$ and $A_2$ are inlet and outlet area of the element. The inlet area is calculated based on the profile of the element, where as the outlet area is calculated using the provided diamter.

  1. Züst S (2017) Model Based Optimization of Internal Heat Sources in Machine Tools. ETH Diss-Nr. 24482.
  2. VDI Wärmeatlas

Parameters

ParameterSymbolUnitDescription
diameter\(D_2\)m(New) diameter after the extension