Choose the wrong statement Condenser, cooling tower, thermal wheels are heat exchangers Coefficient of volume expansivity is an important property for internal forced convection problems Nusselt number compares convective and conductive heat transfer All of the above Radiation heat transfer is an electromagnetic wave None of the above

Choose the wrong statement Condenser, cooling tower, thermal wheels are heat exchangers Coefficient of volume expansivity is an important property for internal forced convection problems Nusselt number compares convective and conductive heat transfer All of the above Radiation heat transfer is an electromagnetic wave None of the above

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter2: Steady Heat Conduction

Section: Chapter Questions

Problem 2.30P: 2.30 An electrical heater capable of generating 10,000 W is to be designed. The heating element is...

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2.30 An electrical heater capable of generating 10,000 W is to be designed. The heating element is to be a stainless steel wire having an electrical resistivity of ohm-centimeter. The operating temperature of the stainless steel is to be no more than 1260°C. The heat transfer coefficient at the outer surface is expected to be no less than in a medium whose maximum temperature is 93°C. A transformer capable of delivering current at 9 and 12 V is available. Determine a suitable size for the wire, the current required, and discuss what effect a reduction in the heat transfer coefficient would have. (Hint: Demonstrate first that the temperature drop between the center and the surface of the wire is independent of the wire diameter, and determine its value.)
Choose the wrong statement Nusselt number compares convective and conductive heat transfer Radiation heat transfer is an electromagnetic wave Condenser, cooling tower,, thermal wheels are heat exchangers None of the given Coefficient of volume expansivity is an important property for internal forced convection problems All of the given
Choose the wrong statement A) Coefficient of volume expansivity is an important property for internal forced convection problems B) Radiation heat transfer is an electromagnetic wave C) None of the above D) Nusselt number compares convective and conductive heat transfer E) Condenser, cooling tower,, thermal wheels are heat exchangers F) All of the above
Choose the false statement? A) At very low values of Prandtl number, material has higher thermal conductivity compared to its momentum diffusivity B) None of the above C) We can express lumped capacitance relation as the combination of Biot and Fourier numbers D) If Biot number is less than 0.1, we can neglect thermal resistance in some direction E) We can calculate convective heat transfer coefficient from Nusselt number
The Biot number is dependent on the following except: A. thermal conductivity of cylinder B. heat transfer coefficient of water bath C. none of the given choices D. radius (characteristic length for cylinders)
Which of the following will have a higher rate of heat transfer. With conduction heat transfer. A. pulverized shale stone B. the stone and the pulverized shale will have the same heat transfer as they have the same conductivity constant. C. a solid block of shale stone D. the pulverized shale will have a higher heat transfer as it has a higher duction coefficient
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Q#01: Write a short note on the following: What are the best possible solutions to increase the heat transfer rate of a body? Which material will transfer more heat? Either a material with thermal conductivity ? = 121 or ? = 22 . Justify your answer. Explain the Fouling phenomenon. What is the effect of fouling on heat transfer rate.
Q#01: Write a short note on What are the best possible solutions to increase the heat transfer rate of a body.Which material will transfer more heat? Either a material with thermal conductivity ? = 121 or ? = 22 . Justify your answer. Explain the Fouling phenomenon. What is the effect of fouling on heat transfer rate?
Hello Sir, Good Afternoon. I have a question in my homework related Heat Transfer lesson. The following below is my question. Please Advice. Thank You "Heat transfer can occur through 3 processes: conduction, convection, and radiation. When we heat water from a temperature of 25 deg C until it boils at a temperature of 100 deg C using a pan on the stove, which process occurs? Explain"
Approximations that are used in fin analysis are No heat generation the fin material has constant properties independent of direction none of the given convective heat transfer coefficient is constant steady heat transfer all of the given