Consider a spiraling line vortex/sink flow in the xy -plane as sketached in Fig. 9-26.The two-dimensional cylindrical velocity components ( u r , u θ ) for this flow field are u r = C / 2 π r , where C and Γ is positive). Verify that this spiraling line vortex/sink flow in the r θ -plane satisfies the two-dimensional incompressible continuity equation. What happens to conservation of mass at the origin? Discuss.
Consider a spiraling line vortex/sink flow in the xy -plane as sketached in Fig. 9-26.The two-dimensional cylindrical velocity components ( u r , u θ ) for this flow field are u r = C / 2 π r , where C and Γ is positive). Verify that this spiraling line vortex/sink flow in the r θ -plane satisfies the two-dimensional incompressible continuity equation. What happens to conservation of mass at the origin? Discuss.
Solution Summary: The author explains the two-dimensional incompressible continuity equation, where the constants are C and Gamma .
Consider a spiraling line vortex/sink flow in the xy-plane as sketached in Fig. 9-26.The two-dimensional cylindrical velocity components
(
u
r
,
u
θ
)
for this flow field are
u
r
=
C
/
2
π
r
, where C and
Γ
is positive). Verify that this spiraling line vortex/sink flow in the
r
θ
-plane satisfies the two-dimensional incompressible continuity equation. What happens to conservation of mass at the origin? Discuss.
Given answers to be: i) 14.65 kN; 6.16 kN; 8.46 kN ii) 8.63 kN; 9.88 kN iii) Bearing 6315 for B1 & B2, or Bearing 6215 for B1
(b)
A steel 'hot rolled structural hollow section' column of length 5.75 m, has
the cross-section shown in Figure Q.5(b) and supports a load of 750 kN.
During service, it is subjected to axial compression loading where one end
of the column is effectively restrained in position and direction (fixed) and
the other is effectively held in position but not in direction (pinned).
i)
Given that the steel has a design strength of 275 MN/m², determine
the load factor for the structural member based upon the BS5950
design approach using Datasheet Q.5(b).
[11]
ii)
Determine the axial load that can be supported by the column
using the Rankine-Gordon formula, given that the yield strength of
the material is 280 MN/m² and the constant *a* is 1/30000.
[6]
300
600
2-300 mm
wide x 5 mm
thick plates.
Figure Q.5(b)
L=5.75m
Pinned
Fixed
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