Reconsider Couette flow between two parallel plates as derived in class, but with the top plate moving with a known velocity +i
and the bottom plate is moving with a known velocity of-Vi,i. Derive the velocity field in the fluid layer.
Calculate the shear stress vector that the fluid exerts onto the top and bottom plates. Assume steady flow, incompressible, 2D, fully developed, no pressure gradient in the x direction. Fluid density and viscosity can also be treated as known.
Calculate the shear stress vector that the fluid exerts onto the top and bottom plates. Assume steady flow, incompressible, 2D, fully developed, no pressure gradient in the x direction. Fluid density and viscosity can also be treated as known.
1 answer:
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Answer:
1) q=18414.93 W
2) C=12920$
Explanation:
Given data:
pipe length L=25m
pipe diameter D=100mm =0.1 m
air temperature =
=25
°C.....= 298.15k
pipe surface temp =150
°C.....=423.15k
surface emissivity e= 0.8
boiler efficiency η=0.90
natural gas price Cg=$0.02 per MJ
1) Total heat loss and radiation heat loss combined
q=
q=б(
^4-
^4)]....... (1)
б=5.67×10^-8 W/m^2K^4 (boltzmann constant)
area A =L.Dπ=25×0.1π=7.85 m^2
putting all these values in eq (1)
q=18414.93 W
2) suppose boiler is operating non stop annual energy loss will be
E=q.t
=18414.93.3600.24.365
=5.81×10^11 J
to find furnace energy consumption
Ef =E/η
=6.46×10^5 MJ
annual cost
C=Cg. Ef
=12920$
Answer:
Explanation:
Kindly go through the attachment for the step by step approach to the solution of this question.
