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 7.52P Problem 7.53P 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 7.58P 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 7.63P Problem 7.64P Problem 7.67P 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 7.76P 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 7.80P Problem 7.81P Problem 7.82P: Consider the plasma spray coating process of Problem 5.25. In addition to the prescribed conditions,... Problem 7.83P 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 7.89P Problem 7.90P: A preheater involves the use of condensing steam at on the inside of a bank of tubes to heat air... Problem 7.91P 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 7.103P Problem 7.104P Problem 7.105P Problem 7.107P: Consider the packed bed of aluminum spheres described in Problem 5.12 under conditions for which the... Problem 7.108P Problem 7.109P Problem 7.111P Problem 7.113P: Packed beds of spherical panicles can be sintered at high temperature to form permeable, rigid... Problem 7.114P Problem 7.116P Problem 7.117P Problem 7.118P Problem 7.119P Problem 7.120P 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 7.123P Problem 7.124P: Benzene, a known carcinogen, has been spilled on the laboratory floor and has spread to a length of... Problem 7.125P Problem 7.126P Problem 7.127P: Condenser cooling water for a power plant is stored in a cooling pond that is 1000m long by 500m... Problem 7.128P 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 7.131P Problem 7.132P Problem 7.133P Problem 7.134P Problem 7.136P Problem 7.137P: It has been suggested that heat transfer from a surface can be augmented by wetting it with water.... Problem 7.138P 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,... Problem 7.143P Problem 7.144P Problem 7.145P Problem 7.146P Problem 7.147P Problem 7.148P: Consider an air-conditioning system composed of a bank of tubes arranged normal to air flowing in a... Problem 7.149P format_list_bulleted