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 round-edged 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.

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Details:

Data Item ESDU 05024
Format:	PDF with software with interactive graphs
Status:	Amendment (B), 01 Nov 2008 Published in Release 2008-03
Previous Releases:	ESDU 05024 Amendment A ESDU 05024 ESDU 01016 ESDU 89040 Amendment B ESDU 89040 Amendment A
ISBN:	978 1 86246 576 3

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This Data Item contains 54 interactive graph(s) as listed below.

Graph	Title
Figure 1	Continuity-mean total-pressure loss coefficient for incompressible flow through sharp-edged sudden contractions
Figure 2	Continuity-mean total-pressure loss coefficient for incompressible flow through sharp-edged contractions
Figure 3	Mass-flow-weighted mean-total-pressure loss coefficient for incompressible flow through sharp-edged sudden contractions
Figure 4	Mass-flow-weighted mean-total-pressure loss coefficient for incompressible flow through sharp-edged sudden contractions
Figure 5a	Continuity-mean round-edge factor at Re₂ = 10⁴
Figure 5b	Continuity-mean round-edge factor at Re₂ = 10⁵
Figure 5c	Continuity-mean round-edge factor at Re₂ = 10⁷
Figure 6a	Continuity-mean round-edge factor at Re₂ = 10⁴
Figure 6b	Continuity-mean round-edge factor at Re₂ = 10⁵
Figure 6c	Continuity-mean round-edge factor at Re₂ = 10⁷
Figure 7a	Mass-flow-weighted round-edge factor at Re₂ = 10⁴
Figure 7b	Mass-flow-weighted round-edge factor at Re₂ = 10⁵
Figure 7c	Mass-flow-weighted round-edge factor at Re₂ = 10⁷
Figure 8a	Mass-flow-weighted round-edge factor at Re₂ = 10⁴
Figure 8b	Mass-flow-weighted round-edge factor at Re₂ = 10⁵
Figure 8c	Mass-flow-weighted round-edge factor at Re₂ = 10⁷
Figure 9a	Continuity-mean chamfer-edge factor at A₂/A₁ = 0 (see Table 7.1 for description of flow classes)
Figure 9b	Continuity-mean chamfer-edge factor at A₂/A₁ = 0.3 (see Table 7.1 for description of flow classes)
Figure 9c	Continuity-mean chamfer-edge factor at A₂/A₁ = 0.6 (see Table 7.1 for description of flow classes)
Figure 10a	Continuity-mean chamfer-edge factor at φ = 36°
Figure 10b	Continuity-mean chamfer-edge factor at φ = 45°
Figure 11a	Continuity-mean chamfer-edge factor at φ = 30°
Figure 11b	Continuity-mean chamfer-edge factor at φ = 45°
Figure 12a	Mass-flow-weighted chamfer-edge factor at A₂/A₁ = 0 (see Table 7.1 for description of flow classes)
Figure 12b	Mass-flow-weighted chamfer-edge factor at A₂/A₁ = 0.3 (see Table 7.1 for description of flow classes)
Figure 12c	Mass-flow-weighted chamfer-edge factor at A₂/A₁ = 0.6 (see Table 7.1 for description of flow classes)
Figure 13a	Mass-flow-weighted chamfer-edge factor at φ = 30°
Figure 13b	Mass-flow-weighted chamfer-edge factor at φ = 45°
Figure 14a	Mass-flow-weighted chamfer-edge factor at φ = 30°
Figure 14b	Mass-flow-weighted chamfer-edge factor at φ = 45°
Figure 15a	Re correlation to continuity-mean chamfer-edge factor at Re₂ = 10⁴ (see Table 7.1 for description of flow classes)
Figure 15b	Re correlation to continuity-mean chamfer-edge factor at Re₂ = 10⁵ (see Table 7.1 for description of flow classes)
Figure 15c	Re correction to continuity-mean chamfer-edge factor at Re₂ = 10⁷ (see Table 7.1 for description of flow classes)
Figure 16a	Re correlation to continuity-mean chamfer-edge factor at φ = 30°
Figure 16b	Re correction to continuity-mean chamfer-edge factor at φ = 45°
Figure 17a	Re correction to mass-flow-weighted chamfer-edge factor at Re₂ = 10⁴ (see Table 7.1 for description of flow classes)
Figure 17b	Re correction to mass-flow-weighted chamfer-edge factor at Re₂ = 10⁵ (see Table 7.1 for description of flow classes)
Figure 17c	Re correction to mass-flow-weighted chamfer-edge factor at Re₂ = 10⁷ (see Table 7.1 for description of flow classes)
Figure 18a	Re correction to mass-flow-weighted chamfer-edge factor at φ = 30°
Figure 18b	Re correction to mass-flow-weighted chamfer-edge factor at φ = 45°
Figure 19	Upstream separation length for flow through sharp-edged sudden contractions
Figure 20	Upstream separation height for flow through sharp-edged sudden contractions
Figure 21	Downstream separation length for flow through sharp-edged sudden contractions
Figure 22	Downstream separation height for flow through sharp-edged sudden contractions
Figure 23	Vena contracta axial location for flow through sharp-edged sudden contractions
Figure 24	Downstream recovery length for flow through sharp-edged sudden contractions
Figure 25	Specific kinetic-energy profile factor at different Reynolds number
Figure 26a	Minimum static pressure coefficient for A₂/A₁ = 0
Figure 26b	Minimum static pressure coefficient for A₂/A₁ = 0.3
Figure 26c	Minimum static pressure coefficient for A₂/A₁ = 0.6
Figure Appendix B1	Static-pressure loss coefficient for flow through sharp-edged sudden contractions
Figure Appendix B2	Static-pressure loss coefficient for flow through sharp-edged sudden contractions
Figure Appendix B3	Area-averaged total-pressure loss coefficient for flow through sharp-edged sudden contractions
Figure Appendix B4	Momentum and kinetic energy factors J_M and J_KE for fully-developed, turbulent incompressible flow