ESDU 05024
Flow through sudden contractions of duct area: pressure losses and flow characteristics.
Abstract:
This Item, which supersedes ESDU 01016, provides information on pressure loss and flow characteristics in flow of Newtonian fluids through a sudden contraction of duct area. Both incompressible and compressible flows are covered and data are presented for sharp, chamfer and roundedged contractions. The data may be applied also to a simple duct entry from a large space. The information is given here in graphical and equation format. The methods are also implemented in computer program ESDUpac A0116.Indexed under:
 Choking Conditions in Duct Flow
 Kinetic Energy Factor
 Pipes with Internal Flow
 Sudden Contractions in Ducts
 Velocity Profile
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Data Item ESDU 05024  

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ESDUpac A0116 
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This Data Item contains 54 interactive graph(s) as listed below.
Graph  Title 

Figure 1  Continuitymean totalpressure loss coefficient for incompressible flow through sharpedged sudden contractions 
Figure 2  Continuitymean totalpressure loss coefficient for incompressible flow through sharpedged contractions 
Figure 3  Massflowweighted meantotalpressure loss coefficient for incompressible flow through sharpedged sudden contractions 
Figure 4  Massflowweighted meantotalpressure loss coefficient for incompressible flow through sharpedged sudden contractions 
Figure 5a  Continuitymean roundedge factor at Re_{2} = 10^{4} 
Figure 5b  Continuitymean roundedge factor at Re_{2} = 10^{5} 
Figure 5c  Continuitymean roundedge factor at Re_{2} = 10^{7} 
Figure 6a  Continuitymean roundedge factor at Re_{2} = 10^{4} 
Figure 6b  Continuitymean roundedge factor at Re_{2} = 10^{5} 
Figure 6c  Continuitymean roundedge factor at Re_{2} = 10^{7} 
Figure 7a  Massflowweighted roundedge factor at Re_{2} = 10^{4} 
Figure 7b  Massflowweighted roundedge factor at Re_{2} = 10^{5} 
Figure 7c  Massflowweighted roundedge factor at Re_{2} = 10^{7} 
Figure 8a  Massflowweighted roundedge factor at Re_{2} = 10^{4} 
Figure 8b  Massflowweighted roundedge factor at Re_{2} = 10^{5} 
Figure 8c  Massflowweighted roundedge factor at Re_{2} = 10^{7} 
Figure 9a  Continuitymean chamferedge factor at A_{2}/A_{1} = 0 (see Table 7.1 for description of flow classes) 
Figure 9b  Continuitymean chamferedge factor at A_{2}/A_{1} = 0.3 (see Table 7.1 for description of flow classes) 
Figure 9c  Continuitymean chamferedge factor at A_{2}/A_{1} = 0.6 (see Table 7.1 for description of flow classes) 
Figure 10a  Continuitymean chamferedge factor at φ = 36° 
Figure 10b  Continuitymean chamferedge factor at φ = 45° 
Figure 11a  Continuitymean chamferedge factor at φ = 30° 
Figure 11b  Continuitymean chamferedge factor at φ = 45° 
Figure 12a  Massflowweighted chamferedge factor at A_{2}/A_{1} = 0 (see Table 7.1 for description of flow classes) 
Figure 12b  Massflowweighted chamferedge factor at A_{2}/A_{1} = 0.3 (see Table 7.1 for description of flow classes) 
Figure 12c  Massflowweighted chamferedge factor at A_{2}/A_{1} = 0.6 (see Table 7.1 for description of flow classes) 
Figure 13a  Massflowweighted chamferedge factor at φ = 30° 
Figure 13b  Massflowweighted chamferedge factor at φ = 45° 
Figure 14a  Massflowweighted chamferedge factor at φ = 30° 
Figure 14b  Massflowweighted chamferedge factor at φ = 45° 
Figure 15a  Re correlation to continuitymean chamferedge factor at Re_{2} = 10^{4} (see Table 7.1 for description of flow classes) 
Figure 15b  Re correlation to continuitymean chamferedge factor at Re_{2} = 10^{5} (see Table 7.1 for description of flow classes) 
Figure 15c  Re correction to continuitymean chamferedge factor at Re_{2} = 10^{7} (see Table 7.1 for description of flow classes) 
Figure 16a  Re correlation to continuitymean chamferedge factor at φ = 30° 
Figure 16b  Re correction to continuitymean chamferedge factor at φ = 45° 
Figure 17a  Re correction to massflowweighted chamferedge factor at Re_{2} = 10^{4} (see Table 7.1 for description of flow classes) 
Figure 17b  Re correction to massflowweighted chamferedge factor at Re_{2} = 10^{5} (see Table 7.1 for description of flow classes) 
Figure 17c  Re correction to massflowweighted chamferedge factor at Re_{2} = 10^{7} (see Table 7.1 for description of flow classes) 
Figure 18a  Re correction to massflowweighted chamferedge factor at φ = 30° 
Figure 18b  Re correction to massflowweighted chamferedge factor at φ = 45° 
Figure 19  Upstream separation length for flow through sharpedged sudden contractions 
Figure 20  Upstream separation height for flow through sharpedged sudden contractions 
Figure 21  Downstream separation length for flow through sharpedged sudden contractions 
Figure 22  Downstream separation height for flow through sharpedged sudden contractions 
Figure 23  Vena contracta axial location for flow through sharpedged sudden contractions 
Figure 24  Downstream recovery length for flow through sharpedged sudden contractions 
Figure 25  Specific kineticenergy profile factor at different Reynolds number 
Figure 26a  Minimum static pressure coefficient for A_{2}/A_{1} = 0 
Figure 26b  Minimum static pressure coefficient for A_{2}/A_{1} = 0.3 
Figure 26c  Minimum static pressure coefficient for A_{2}/A_{1} = 0.6 
Figure Appendix B1  Staticpressure loss coefficient for flow through sharpedged sudden contractions 
Figure Appendix B2  Staticpressure loss coefficient for flow through sharpedged sudden contractions 
Figure Appendix B3  Areaaveraged totalpressure loss coefficient for flow through sharpedged sudden contractions 
Figure Appendix B4  Momentum and kinetic energy factors J_{M} and J_{KE} for fullydeveloped, turbulent incompressible flow 