Problems: Heat Transfer by Natural Convection

Problems: Heat Transfer by Natural Convection Notes | Study Heat Transfer - Mechanical Engineering

Document Description: Problems: Heat Transfer by Natural Convection for Mechanical Engineering 2022 is part of Natural Convection for Heat Transfer preparation. The notes and questions for Problems: Heat Transfer by Natural Convection have been prepared according to the Mechanical Engineering exam syllabus. Information about Problems: Heat Transfer by Natural Convection covers topics like and Problems: Heat Transfer by Natural Convection Example, for Mechanical Engineering 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises and tests below for Problems: Heat Transfer by Natural Convection.

Introduction of Problems: Heat Transfer by Natural Convection in English is available as part of our Heat Transfer for Mechanical Engineering & Problems: Heat Transfer by Natural Convection in Hindi for Heat Transfer course. Download more important topics related with Natural Convection, notes, lectures and mock test series for Mechanical Engineering Exam by signing up for free. Mechanical Engineering: Problems: Heat Transfer by Natural Convection Notes | Study Heat Transfer - Mechanical Engineering
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Frequently Asked Questions and Problems for Practice (Module 5)

 Q.1 Define Grashof number and its physical significance. What is the analogous in forced convection? Q.2 What are the criteria to know natural and forced convection? Q.3 Define Rayleigh number and its physical significance. Q.4 Show the flow pattern of natural convection for a (a) hot surface down, (b) hot surface up, (c) cold surface down, and (d) cold surface up. Q.5 Warm air at 65oC, 3 m/s enters into a square (25 cm) duct made up of steel metal. The un-insulated duct is 10 m long and is in contact with the atmospheric air at 25oC. If the heat losses to the atmosphere by natural convection then what will be the exit warm air temperature from the duct. It may be assumed that the natural convective flow at one surface does not affect the others as the two surfaces are horizontal, one at the top and at the bottom, and the two surfaces are vertical. Calculate the heat transfer coefficient for the obviously forced convection inside of the duct. Q.6. A horizontal tube having diameter of 10 mm is heated to a surface temperature of 240 oC. The tube is exposed to air at 25oC. Calculate the natural convective heat transfer. Q.7. A sphere having diameter of 25 cm is heated to a surface temperature of 240 oC. The sphere is exposed to air at 25oC. Calculate the natural convective heat transfer. Q.8. A square (1 m) flat plate inclined at 45 oC with the horizontal is exposed to air at 25oC and 1 atm. The plate receives 750 W/m2 from the Sun and dissipated the heat to the atmosphere by natural convection. What will be the average temperature of the plate at steady-state?
The document Problems: Heat Transfer by Natural Convection Notes | Study Heat Transfer - Mechanical Engineering is a part of the Mechanical Engineering Course Heat Transfer.
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