Q1) A flat plate copper slab with thickness of 30 mm having the followingproperties; 9000 kg/m³, 0.38 kJ/kg K, and 370 W/m.K exposed to 100°C hot air.The initial temperature of the plate was 210°C and in 5 minutes the temperaturereduced by 40°C. Find the convection heat transfer coefficient.

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Answered: convection heat transfer

Engineering

Mechanical Engineering

convection heat transfer

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.

Chapter1: Basic Modes Of Heat Transfer

Section: Chapter Questions

Problem 1.64P: The interior wall of a large, commercial walk-in type meat freezer is covered under normal operating...

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Concept explainers

Mechanisms of heat transfer

Heat transfer is an essential discipline in thermal engineering that deals with the transfer, conversion, usability, and creation of heat or thermal energy. Transfer of heat occurs through various mechanisms like conduction, convection, radiation, and change of phases. All these mechanisms have distinct characteristics, but these mechanisms can simultaneously occur in an identical system.

Question

Q1) A flat plate copper slab with thickness of 30 mm having the following
properties; 9000 kg/m³, 0.38 kJ/kg K, and 370 W/m.K exposed to 100°C hot air.
The initial temperature of the plate was 210°C and in 5 minutes the temperature
reduced by 40°C. Find the convection heat transfer coefficient.

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Step 1: Calculate the characteristic length of the flat plate.

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Step 2: Write the transient heat equation using lumped capacitance method.

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