In Problem 6.107, a theoretical flow rate of water to a village was calculated without any consideration of line losses. In Problem 7.50, an assumed value of 2.8 m was included as an estimate for losses in the line and the resulting flow rate was only 6.22 x 10 − 4 m 3 / s . Now rework the problem and determine the actual losses that would occur. Use 25°C water running in a flexible smooth tube that is 1200 m long and has the same 20 -mm diameter. Let's check the assumed value for losses now. Using a flow rate of 6.22 x 10 − 4 m 3 / s , what would be the actual losses? What conclusions can we draw about the original proposal to install this line? Why is the calculation of losses so important?
In Problem 6.107, a theoretical flow rate of water to a village was calculated without any consideration of line losses. In Problem 7.50, an assumed value of 2.8 m was included as an estimate for losses in the line and the resulting flow rate was only 6.22 x 10 − 4 m 3 / s . Now rework the problem and determine the actual losses that would occur. Use 25°C water running in a flexible smooth tube that is 1200 m long and has the same 20 -mm diameter. Let's check the assumed value for losses now. Using a flow rate of 6.22 x 10 − 4 m 3 / s , what would be the actual losses? What conclusions can we draw about the original proposal to install this line? Why is the calculation of losses so important?
Solution Summary: The author explains Reynolds number, velocity, diameter, kinematic viscosity, and cross-section area of the pipe.
In Problem 6.107, a theoretical flow rate of water to a village was calculated without any consideration of line losses. In Problem 7.50, an assumed value of
2.8
m was included as an estimate for losses in the line and the resulting flow rate was only
6.22
x
10
−
4
m
3
/
s
. Now rework the problem and determine the actual losses that would occur. Use 25°C water running in a flexible smooth tube that is
1200
m long and has the same
20
-mm diameter. Let's check the assumed value for losses now. Using a flow rate of
6.22
x
10
−
4
m
3
/
s
, what would be the actual losses? What conclusions can we draw about the original proposal to install this line? Why is the calculation of losses so important?
Qu 5 Determine the carburizing time necessary to achieve a carbon concentration of 0.30 wt% at a position 4 mm into an iron carbon alloy that initially contains 0.10 wt% C. The surface concentration is to be maintained at 0.90 wt% C, and the treatment is to be conducted at 1100°C. Use the data for the diffusion of
carbon into y-iron: Do = 2.3 x10-5 m2/s and Qd = 148,000 J/mol. Express your answer in hours to three significant figures.
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In figure A, the homogeneous rod of constant cross section is attached to unyielding supports. In figure B, a homogeneous bar with a cross-sectional area of 600 mm2 is attached to rigid supports. The bar carries the axial loads P1 = 20 kN and P2 = 60 kN, as shown.1. In figure A, derive the expression that calculates the reaction R1 in terms of P, and the given dimensions.2. In figure B, calculate the reaction (kN) at A.3. In figure B, calculate the maximum axial stress (MPa) in the rod.
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