A 30 mm diameter copper sphere and a 30 mm copper cube are both heated in a furnace to 923 K. They are then annealed in an air at 378K. If the external heat transfer coefficient h is 80 W/m2.K in both cases, what is the temperature of the sphere and of the cube at the end of 6 minutes

A 30 mm diameter copper sphere and a 30 mm copper cube are both heated in a furnace to 923 K. They are then annealed in an air at 378K. If the external heat transfer coefficient h is 80 W/m2.K in both cases, what is the temperature of the sphere and of the cube at the end of 6 minutes

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.

Chapter3: Transient Heat Conduction

Section: Chapter Questions

Problem 3.36P

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Concept explainers

Work and Heat Transfer

It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. There are various mechanisms by which, transfer of heat takes place i.e. thermal conduction, convection, radiation or by change of phase. All these mechanisms have their own specific features which sometimes occur simultaneously within the same system.

Question

A 30 mm diameter copper sphere and a 30 mm copper cube are
both heated in a furnace to 923 K. They are then annealed in an air
at 378K. If the external heat transfer coefficient h is 80 W/m2.K in
both cases, what is the temperature of the sphere and of the cube
at the end of 6 minutes

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