Fluid Mechanics (2nd Edition)
2nd Edition
ISBN: 9780134649290
Author: Russell C. Hibbeler
Publisher: PEARSON
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Chapter 6, Problem 40P
To determine
The required power to keep the vane moving to the left.
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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 6 Solutions
Fluid Mechanics (2nd Edition)
Ch. 6 - Prob. 1FPCh. 6 - The shield of negligible weight is held at an...Ch. 6 - Prob. 3FPCh. 6 - Crude oil flows into the open air at the same rate...Ch. 6 - The table fan develops a slipstream that has a...Ch. 6 - Prob. 6FPCh. 6 - Determine the linear momentum of a mass of fluid...Ch. 6 - Prob. 2PCh. 6 - A volumetric discharge of 1.25 m3/s passes out the...Ch. 6 - Water flows with a velocity of 6 m/s through the...
Ch. 6 - Water is ejected from the hose at A with a...Ch. 6 - Water flows out of the reducing elbow at 0.6...Ch. 6 - Oil flows through the 100-mm-diameter pipe with a...Ch. 6 - Prob. 8PCh. 6 - Prob. 9PCh. 6 - Water flows through the elbow with a velocity of...Ch. 6 - Prob. 11PCh. 6 - The water jet is ejected from the 4-in.-diameter...Ch. 6 - The water jet is ejected from the 4-in.-diameter...Ch. 6 - Water flows through the elbow at 8 ft/s. Assuming...Ch. 6 - The steady jet of water flows from the...Ch. 6 - The steady jet of water flows from the...Ch. 6 - Crude oil flows through the horizontal tapered 45°...Ch. 6 - A speedboat is powered by the jet drive shown....Ch. 6 - The 160-lb man stands on the scale. If the bucket...Ch. 6 - Prob. 20PCh. 6 - Prob. 21PCh. 6 - Water flows out of the reducing elbow at 0.4...Ch. 6 - Water flows through the 2-in.-diameter pipe...Ch. 6 - The pipe AB has a diameter of 40 mm. If water...Ch. 6 - Prob. 25PCh. 6 - Prob. 26PCh. 6 - Pipe AB has a diameter of 40 mm. If water flows...Ch. 6 - Pipe AB has a diameter of 40 mm. If the tensile...Ch. 6 - The disk valve is used to control the flow of...Ch. 6 - Prob. 30PCh. 6 - Prob. 31PCh. 6 - Prob. 32PCh. 6 - Water flows through the pipe C at 4 m/s. Determine...Ch. 6 - Prob. 34PCh. 6 - The 1-in.-diameter pipe ejects water towards the...Ch. 6 - Prob. 36PCh. 6 - Water flows through the hose with a velocity of 3...Ch. 6 - Water flows through the hose with a velocity of 3...Ch. 6 - A 20-mm-diameter stream flows at 8 m/s against the...Ch. 6 - Determine the power required to keep the vane...Ch. 6 - Prob. 41PCh. 6 - The boat is powered by the fan, which develops a...Ch. 6 - The vane is moving at 80 ft/s when a jet of water...Ch. 6 - The car is used to scoop up water that is in a...Ch. 6 - The water stream strikes the inclined surface of...Ch. 6 - Prob. 46PCh. 6 - Prob. 47PCh. 6 - A 25-mm-diameter stream flows at 10 m/s against...Ch. 6 - Prob. 49PCh. 6 - Water flows into the bend fitting with a velocity...Ch. 6 - Prob. 51PCh. 6 - Water flows into the Tee fitting at 3.6 m/s. If a...Ch. 6 - Prob. 53PCh. 6 - Prob. 54PCh. 6 - If the velocity through the pipe is 4 m/s,...Ch. 6 - Water flows through the 200-mm-diameter pipe bend...Ch. 6 - Water flows through the pipe with a velocity of 5...Ch. 6 - The bend is connected to the pipe at flanges A and...Ch. 6 - The fan blows air at 6000 ft3/min. If the fan has...Ch. 6 - Prob. 60PCh. 6 - Prob. 61PCh. 6 - Prob. 62PCh. 6 - The lawn sprinkler consists of four arms that...Ch. 6 - Prob. 64PCh. 6 - Prob. 65PCh. 6 - Prob. 66PCh. 6 - Prob. 67PCh. 6 - Prob. 68PCh. 6 - The propeller of a boat discharges 67.5 ft3/s of...Ch. 6 - Determine the largest speed of the breeze that can...Ch. 6 - Prob. 71PCh. 6 - Prob. 72PCh. 6 - Prob. 73PCh. 6 - Prob. 74PCh. 6 - Prob. 75PCh. 6 - Prob. 76PCh. 6 - Prob. 77PCh. 6 - Prob. 78PCh. 6 - Prob. 79PCh. 6 - The jet is traveling at a velocity of 400 m/s in...Ch. 6 - Prob. 81PCh. 6 - Prob. 82PCh. 6 - Prob. 83PCh. 6 - The jet is traveling at 500 mi/h, 30° above the...Ch. 6 - Prob. 85PCh. 6 - Prob. 86PCh. 6 - The rocket is traveling upwards at 300 m/s and...Ch. 6 - The balloon has a mass of 20 g (empty) and it is...Ch. 6 - Prob. 89PCh. 6 - Prob. 90PCh. 6 - Prob. 91PCh. 6 - Prob. 92P
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