EBK FLUID MECHANICS
2nd Edition
ISBN: 9780134626055
Author: HIBBELER
Publisher: PEARSON CUSTOM PUB.(CONSIGNMENT)
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Chapter 1, Problem 7P
To determine
The Absolute pressure of the nitrogen in the tank
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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.
In an industrial facility, a counter-flow double-pipe heat exchanger uses superheated steam at a temperature of 155°C to
heat feed water at 30°C. The superheated steam experiences a temperature drop of 70°C as it exits the heat exchanger.
The water to be heated flows through the heat exchanger tube of negligible thickness at a constant rate of 3.47 kg/s. The
convective heat transfer coefficient on the superheated steam and water side is 850 W/m²K and 1250 W/m²K,
respectively. To account for the fouling due to chemical impurities that might be present in the feed water, assume
a fouling factor of 0.00015 m²-K/W for the water side.
The specific heat of water is determined at an average temperature of (30 +70)°C/2 = 50°C and is taken to be
J/kg.K.
Cp=
4181
Water
Steam
What would be the required heat exchanger area in case of parallel-flow arrangement?
The required heat exchanger area in case of parallel-flow arrangement is
1m².
Chapter 1 Solutions
EBK FLUID MECHANICS
Ch. 1 - Prob. 1PCh. 1 - Evaluate each of the following to three...Ch. 1 - Evaluate each of the following to three...Ch. 1 - Convert the following temperatures: (a) 250 K to...Ch. 1 - The tank contains a liquid having a density of...Ch. 1 - If air within the tank is at an absolute pressure...Ch. 1 - The bottle tank has a volume of 0.35 m3 and...Ch. 1 - The bottle tank contains nitrogen having a...Ch. 1 - Prob. 9PCh. 1 - Dry air at 25°C has a density of 1.23 kg/m3. But...
Ch. 1 - The tanker carries 900(103) barrels of crude oil...Ch. 1 - Water in the swimming pool has a measured depth of...Ch. 1 - Determine the weight of carbon tetrachloride that...Ch. 1 - The tank contains air at a temperature of 18°C and...Ch. 1 - The tank contains 4 kg of air at an absolute...Ch. 1 - The 8-m-diameter spherical balloon is filled with...Ch. 1 - Gasoline is mixed with 8 ft3 of kerosene so that...Ch. 1 - Determine the change in the density of oxygen when...Ch. 1 - The container is filled with water at a...Ch. 1 - The rain cloud has an approximate volume of 6.50...Ch. 1 - A volume of 8 m3 of oxygen initially at 80 kPa of...Ch. 1 - Prob. 22PCh. 1 - Water at 20°C is subjected to a pressure increase...Ch. 1 - Prob. 24PCh. 1 - At a point deep in the ocean, the specific weight...Ch. 1 - A 2-kg mass of oxygen is held at a constant...Ch. 1 - The viscosity of SAE 10 W30 oil is μ = 0.100...Ch. 1 - If the kinematic viscosity of glycerin is ν =...Ch. 1 - An experimental test using human blood at T = 30°C...Ch. 1 - The plate is moving at 0.6 mm/s when the force...Ch. 1 - When the force P is applied to the plate, the...Ch. 1 - When the force P is applied to the plate, the...Ch. 1 - The Newtonian fluid is confined between a plate...Ch. 1 - The Newtonian fluid is confined between the plate...Ch. 1 - If a force of P = 2 N causes the 30-mm-diameter...Ch. 1 - A plastic strip having a width of 0.2 m and a mass...Ch. 1 - A plastic strip having a width of 0.2 m and a mass...Ch. 1 - The tank containing gasoline has a long crack on...Ch. 1 - The tank containing gasoline has a long crack on...Ch. 1 - Determine the constants B and C in Andrade's...Ch. 1 - The viscosity of water can be determined using the...Ch. 1 - Determine the constants B and C in the Sutherland...Ch. 1 - The constants B=1.357(10−6) N·s/(m2·K1/2) and C =...Ch. 1 - The read-write head for a hand-held music player...Ch. 1 - Determine the torque T required to rotate the disk...Ch. 1 - Prob. 46PCh. 1 - Prob. 47PCh. 1 - The tube rests on a 1.5-mm thin film of oil having...Ch. 1 - The tube rests on a 1.5-mm thin film of oil having...Ch. 1 - Prob. 50PCh. 1 - Prob. 51PCh. 1 - How hot can you make a cup of tea if you climb to...Ch. 1 - A boat propeller is rotating in water that has a...Ch. 1 - As water at 20°C flows through the transition, its...Ch. 1 - Water at 70°F is flowing through a garden hose. If...Ch. 1 - Prob. 56PCh. 1 - For water falling out of the tube, there is a...Ch. 1 - Steel particles are ejected from a grinder and...Ch. 1 - Prob. 59PCh. 1 - Prob. 60PCh. 1 - Prob. 61PCh. 1 - Prob. 62PCh. 1 - Because cohesion resists any increase in the...Ch. 1 - The glass tube has an inner diameter d and is...Ch. 1 - The glass tube has an inner diameter of d = 2 mm...Ch. 1 - Prob. 66PCh. 1 - The triangular glass rod has a weight of 0.3 N and...Ch. 1 - The triangular glass rod has a weight of 0.3 N and...Ch. 1 - Water poured from this pitcher tends to cling to...Ch. 1 - If a drop of oil is placed on a water surface,...Ch. 1 - The shape of this municipal water tank has the...
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