Solutions for Fundamentals of Heat and Mass Transfer
Problem 7.1P:
Consider the following fluids at a film temperature of 300 K in parallel flow over a flat plate with...Problem 7.2P:
Engine oil at 100C and a velocity of 0.1 m/s flows over both surfaces of a 1-m-long flat plate...Problem 7.3P:
Consider steady, parallel flow of atmospheric air over a flat plate. The air has a temperature and...Problem 7.4P:
Consider a liquid metal (Pr1), with free stream conditions u and T, in parallel flow over an...Problem 7.5P:
Consider the velocity boundary layer profile for flow over a flat plate to be of the form u=C1+C2y....Problem 7.6P:
Consider a steady, turbulent boundary layer on and isothermal flat plate of temperature Ts. The...Problem 7.7P:
Consider flow over a flat plate for which it is desired to determine the average heat transfer...Problem 7.8P:
A flat plate of width 1 m is maintained at a uniform surface temperature of Ts=150C by using...Problem 7.9P:
An electric air heater consists of a horizontal array of thin metal strips that are each 10 mm long...Problem 7.10P:
Consider atmospheric air at 25C and a velocity of 25 m/s flowing over both surfaces of a 1-m-long...Problem 7.12P:
Repeat Problem 7.11 for the case when the boundary layer is tripped to a turbulent condition at its...Problem 7.14P:
Consider water at 27°C in parallel flow over an isothermal, 1-m-long flat plate with a velocity of 2...Problem 7.15P:
Explain under what conditions the total rate of heat transfer from an isothermal flat plate of...Problem 7.16P:
In fuel cell stacks, it is desirable to operate under conditions that promote uniform surface...Problem 7.20P:
The roof of a refrigerated truck compartment is of composite construction, consisting of a layer of...Problem 7.21P:
The top surface of a heated compartment consists of very smooth (A) and highly roughened...Problem 7.22P:
Calculate the value of the average heat transfer coefficient for the plate of Problem 7.21 when the...Problem 7.23P:
The proposed design for an anemometer to determine the velocity of an airstream in a wind tunnel is...Problem 7.24P:
Steel (AISI 1010) plates of thickness =6mm and length L=1m on a side are conveyed from a heat...Problem 7.26P:
Consider a rectangular fin that is used to cool a motor-cycle engine. The tin is 0.15 m long and at...Problem 7.27P:
The Weather Channel reports that it is a hot, muggy day with an air temperature of 90F, 40 a 10 mph...Problem 7.28P:
In the production of sheet metals or plastics, it is customary to cool the material before it leaves...Problem 7.29P:
An array of electronic chips is mounted within a sealed rectangular enclosure, and cooling...Problem 7.32P:
A steel strip emerges from the hot roll section of a steel mill at a speed of 20 m/s and a...Problem 7.33P:
In Problem 7.23. an anemometer design was explored, and the assumption was made that the strip...Problem 7.35P:
One hundred electrical components, each dissipating 25 W, are attached to one surface of a square...Problem 7.37P:
The boundary layer associated with parallel flow over an isothermal plate may be tripped at any...Problem 7.38P:
Forced air at 250C and 10 m/s is used to cool electronic elements mounted on a circuit board....Problem 7.39P:
Air at atmospheric pressure and a temperature of 25°C is in parallel flow at a velocity of 5 m/s...Problem 7.42P:
Consider a thin, 50mm50mm fuel cell similar to that of Example 1.5, with air in parallel flow over...Problem 7.43P:
The cover plate of a flat-plate solar collector is at 15°C, while ambient air at 10°C is in parallel...Problem 7.44P:
An array of 10 silicon chips, each of length L=10mm on a side, is insulated on one surface and...Problem 7.45P:
A square (10mm10mm) silicon chip is insulated on one side and cooled on the opposite side by...Problem 7.47P:
A circular pipe of 25-mm outside diameter is placed in an airstream at 25C and 1-atm pressure. The...Problem 7.48P:
An L=1-m- long vertical copper tube of inner diameter Di=20mm and wall thickness t=2mm contains...Problem 7.49P:
A long, cylindrical, electrical heating element of diameter D=10mm, thermal conductivity k=240W/mK,...Problem 7.50P:
Consider the conditions of Problem 7.49, but now allow for radiation exchange between the surface of...Problem 7.51P:
Pin fins are to be specified for use in an industrial cooling application. The fins will be...Problem 7.56P:
Hot water at 500C is routed from one building in which it is generated to an adjoining building in...Problem 7.57P:
In a manufacturing process, long aluminum rods of square cross section with d=25mm are cooled from...Problem 7.59P:
To determine air velocity changes, it is proposed to measure the electric current required to...Problem 7.62P:
Determine the convection heat loss from both the top and the bottom of a flat plate at Ts=80C with...Problem 7.69P:
A thermocouple is inserted into a hot air duct to measure the air temperature. -me thermocouple (T1)...Problem 7.75P:
Consider a sphere with a diameter of 20 mm and a surface temperature of 60°C that is immersed in a...Problem 7.77P:
A spherical, underwater instrument pod used to make soundings and to measure conditions in the water...Problem 7.78P:
Worldwide. over a billion solder balls must be manufactured daily for assembling electronics...Problem 7.82P:
Consider the plasma spray coating process of Problem 5.25. In addition to the prescribed conditions,...Problem 7.84P:
Tissue engineering involves the development of biological substitutes that restore or improve tissue...Problem 7.87P:
Consider temperature measurement in a gas stream using the thermocouple junction described in...Problem 7.90P:
A preheater involves the use of condensing steam at on the inside of a bank of tubes to heat air...Problem 7.92P:
A tube bank uses an aligned arrangement of 10-mm-diameter tubes with ST=SL=20mm. There are 10 rows...Problem 7.94P:
A tube bank uses an aligned arrangement of 30-mm-diameter tubes with ST=SL=60mm and a tube length of...Problem 7.95P:
Repeat Problem 7.94, but with NL=7,NT=10, and V=10.5m/s.Problem 7.99P:
Heating and cooling with miniature impinging jets has been proposed for numerous applications. For a...Problem 7.100P:
A circular transistor of 10-mm diameter is cooled by impingement of an air jet exiting a...Problem 7.101P:
A long rectangular plate of AISI 304 stainless steel is initially at 1200 K and is cooled by an...Problem 7.102P:
A cryogenic probe is used to treat cancerous skin tissue. The probe consists of a single round jet...Problem 7.107P:
Consider the packed bed of aluminum spheres described in Problem 5.12 under conditions for which the...Problem 7.113P:
Packed beds of spherical panicles can be sintered at high temperature to form permeable, rigid...Problem 7.122P:
Dry air at 35°C and a velocity of 20 m/s flows over a wetted plate of length 500 mm and width 150...Problem 7.124P:
Benzene, a known carcinogen, has been spilled on the laboratory floor and has spread to a length of...Problem 7.127P:
Condenser cooling water for a power plant is stored in a cooling pond that is 1000m long by 500m...Problem 7.129P:
In a paper-drying process, the paper moves on a conveyor belt at 0.2 m/s, while dry air from an...Problem 7.137P:
It has been suggested that heat transfer from a surface can be augmented by wetting it with water....Problem 7.139P:
Cylindrical dry-bulb and wet-bulb thermometers are installed in a large-diameter duct to obtain the...Problem 7.140P:
The thermal pollution problem is associated with discharging warm water from an electrical power...Problem 7.141P:
Cranberries are harvested by flooding the bogs in which they are grown and raking them into troughs...Problem 7.142P:
A spherical drop of water, 0.5 mm in diameter, is falling at a velocity of 2.15 m/s through dry,...Browse All Chapters of This Textbook
Chapter 1 - IntroductionChapter 2 - Introduction To ConductionChapter 3 - One-dimensional, Steady-state ConductionChapter 4 - Two-dimensional, Steady-state ConductionChapter 5 - Transient ConductionChapter 6 - Introduction To ConvectionChapter 7 - External FlowChapter 8 - Internal FlowChapter 9 - Free ConvectionChapter 10 - Boiling And Condensation
Book Details
Completely updated, the seventh edition provides engineers with an in-depth look at the key concepts in the field. It incorporates new discussions on emerging areas of heat transfer, discussing technologies that are related to nanotechnology, biomedical engineering and alternative energy. The example problems are also updated to better show how to apply the material. And as engineers follow the rigorous and systematic problem-solving methodology, they'll gain an appreciation for the richness and beauty of the discipline.
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