Fluid Mechanics (2nd Edition)
2nd Edition
ISBN: 9780134649290
Author: Russell C. Hibbeler
Publisher: PEARSON
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Chapter 4, Problem 31P
To determine
The open control surfaces, and show the positive direction areas of water in the pipe system.
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A counter flow double pipe heat exchanger is being used to cool hot oil from 320°F to 285°F
using cold water. The water, which flows through the inner tube, enters the heat exchanger at 70°F
and leaves at 175°F. The inner tube is ¾-std type L copper. The overall heat transfer coefficient
based on the outside diameter of the inner tube is 140 Btu/hr-ft2-°F. Design conditions call for a
total heat transfer duty (heat transfer rate between the two fluids) of 20,000 Btu/hr. Determine the
required length of this heat exchanger (ft).
!
Required information
A one-shell-pass and eight-tube-passes heat exchanger is used to heat glycerin (cp=0.60 Btu/lbm.°F) from 80°F to 140°F
by hot water (Cp = 1.0 Btu/lbm-°F) that enters the thin-walled 0.5-in-diameter tubes at 175°F and leaves at 120°F. The total
length of the tubes in the heat exchanger is 400 ft. The convection heat transfer coefficient is 4 Btu/h-ft²°F on the glycerin
(shell) side and 70 Btu/h-ft²°F on the water (tube) side.
NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part.
Determine the rate of heat transfer in the heat exchanger before any fouling occurs.
Correction factor F
1.0
10
0.9
0.8
R=4.0 3.0 2.0.15 1.0 0.8.0.6 0.4 0.2
0.7
0.6
R=
T1-T2
12-11
0.5
12-11
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
(a) One-shell pass and 2, 4, 6, etc. (any multiple of 2), tube passes
P=
T₁-11
The rate of heat transfer in the heat exchanger is
Btu/h.
!
Required information
Air at 25°C (cp=1006 J/kg.K) is to be heated to 58°C by hot oil at 80°C (cp = 2150 J/kg.K) in a cross-flow heat exchanger
with air mixed and oil unmixed. The product of heat transfer surface area and the overall heat transfer coefficient is 750
W/K and the mass flow rate of air is twice that of oil.
NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part.
Air
Oil
80°C
Determine the effectiveness of the heat exchanger.
Chapter 4 Solutions
Fluid Mechanics (2nd Edition)
Ch. 4 - Prob. 1FPCh. 4 - Air flows through the triangular duct at 0.7 kg/s...Ch. 4 - Water has an average velocity of 8 m/s through the...Ch. 4 - Crude oil flows through the pipe at 0.02 m3/s. If...Ch. 4 - Determine the mass flow of air having a...Ch. 4 - Prob. 6FPCh. 4 - The velocity of the steady flow at A and B is...Ch. 4 - Prob. 8FPCh. 4 - As air exits the tank at 0.05 kg/s, it is mixed...Ch. 4 - Water flows along the triangular channel having...
Ch. 4 - Determine the mass flow of nitrogen in an...Ch. 4 - Nitrogen gas flows through the 8-in.-diameter...Ch. 4 - Air enters the turbine of a jet engine at a rate...Ch. 4 - Determine the mass flow of air in the duct if it...Ch. 4 - Prob. 6PCh. 4 - Prob. 7PCh. 4 - Prob. 8PCh. 4 - The velocity profile of a liquid flowing through...Ch. 4 - Prob. 10PCh. 4 - Prob. 11PCh. 4 - Determine the mass flow of the fluid if it has the...Ch. 4 - The liquid in the rectangular channel has a...Ch. 4 - The liquid in the rectangular channel has a...Ch. 4 - Water flows along the semicircular trough with an...Ch. 4 - The 30-mm-diameter nozzle ejects water such that...Ch. 4 - Determine the volumetric flow through the...Ch. 4 - Determine the volumetric flow through the...Ch. 4 - The human heart has an average discharge of...Ch. 4 - Prob. 20PCh. 4 - Prob. 21PCh. 4 - Kerosene flows through the nozzle at 0.25 m3/s....Ch. 4 -
Kerosene flows through the nozzle at 0.25 m3/s....Ch. 4 - At two specific instants during a heartbeat, the...Ch. 4 - Prob. 25PCh. 4 - The radius of the circular duct varies as m,...Ch. 4 - Prob. 27PCh. 4 - Prob. 28PCh. 4 - The average velocities of water flowing steadily...Ch. 4 - Air flows through the tapered duct, and during...Ch. 4 - Prob. 31PCh. 4 - Air is pumped into the tank, and at the instant...Ch. 4 - Prob. 33PCh. 4 - Prob. 34PCh. 4 - Compressed air is being released from the tank,...Ch. 4 - Prob. 36PCh. 4 - Prob. 38PCh. 4 - Water flows through the pipe at A at 60 kg/s, and...Ch. 4 - Prob. 40PCh. 4 - Prob. 41PCh. 4 - Nitrogen flows into the tank at A at VA = 3 m/s,...Ch. 4 - Nitrogen flows into the tank at A at VA = 3 m/s,...Ch. 4 - The flat strip is sprayed with paint using the six...Ch. 4 - Prob. 45PCh. 4 - Prob. 46PCh. 4 - Drilling fluid is pumped down through the center...Ch. 4 - Drilling fluid is pumped down through the center...Ch. 4 - Oil flows into the pipe at A with an average...Ch. 4 - The unsteady flow of glycerin is such that at A it...Ch. 4 - The unsteady flow of glycerin is such that at A it...Ch. 4 - Prob. 52PCh. 4 - Prob. 53PCh. 4 - The cylindrical plunger traveling at Vp =...Ch. 4 - The cylindrical plunger traveling at Vp =...Ch. 4 - Prob. 56PCh. 4 - The pressure vessel of a nuclear reactor is filled...Ch. 4 - With every breath, air enters the trachea, its...Ch. 4 - A liquid flows through the drainpipe such that it...Ch. 4 - Oil flows into a mixing tank through pipe A with...Ch. 4 - Oil flows into the mixing tank through pipe A at...Ch. 4 - Water flows into the tank through two pipes. At A...Ch. 4 - Gasoline flows into the tank through two pipes. At...Ch. 4 - Prob. 64PCh. 4 - The cylindrical syringe is actuated by applying a...Ch. 4 - Prob. 66PCh. 4 - The tank contains air at a temperature of 20°C and...Ch. 4 - The natural gas (methane) and crude oil mixture...Ch. 4 - Prob. 69PCh. 4 - Prob. 70PCh. 4 - Prob. 71PCh. 4 - Prob. 72PCh. 4 - Prob. 73PCh. 4 - Prob. 74PCh. 4 - Kerosene flows into the 4-ft-diameter cylindrical...Ch. 4 - Prob. 76PCh. 4 - Water flows into the cylindrical tank through...Ch. 4 - Water flows into the cylindrical tank through...Ch. 4 - The cylinder is pushed down into the tube at a...Ch. 4 - Prob. 80PCh. 4 - Prob. 81PCh. 4 - Prob. 82PCh. 4 - Prob. 83PCh. 4 - Prob. 84PCh. 4 - Oil flows into the trapezoidal container at a...Ch. 4 - Oil flows into the conical frustum at a constant...Ch. 4 - Water in the triangular trough is at a depth of y...Ch. 4 - Prob. 88PCh. 4 - Prob. 89PCh. 4 - Prob. 90PCh. 4 - Prob. 91PCh. 4 - Hydrogen is pumped into the closed cylindrical...Ch. 4 - Hydrogen is pumped into the closed cylindrical...Ch. 4 - Prob. 94PCh. 4 - A part is manufactured by placing molten plastic...
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