The ductility of a large copper (k = 386 W/mºC, a = must be increased by quenching before it can be extruded. The copper slab is first heated up to have a uniform initial temperature of 1,000 °C. Cold water is then sprayed onto one side of the slab to maintain a constant surface temperature of 20 °C. (a) Draw a simple sketch to show the change of temperature inside the slab with time. (b) Calculate the temperature (in °C) at 10 cm below the surface 20 seconds after the surface temperature is lowered. (c) Calculate the heat transfer flux rate (kW/m2 ) through a plane 8 cm below the surface 15 seconds after the surface temperature is lowered. (d) Calculate the total heat removed by cold water from the surface in the first 5 seconds (J/m2_). 11.234 x10-5 m 2 /s, p = 8.954 g/cm3) slab

The ductility of a large copper (k = 386 W/mºC, a = must be increased by quenching before it can be extruded. The copper slab is first heated up to have a uniform initial temperature of 1,000 °C. Cold water is then sprayed onto one side of the slab to maintain a constant surface temperature of 20 °C. (a) Draw a simple sketch to show the change of temperature inside the slab with time. (b) Calculate the temperature (in °C) at 10 cm below the surface 20 seconds after the surface temperature is lowered. (c) Calculate the heat transfer flux rate (kW/m2 ) through a plane 8 cm below the surface 15 seconds after the surface temperature is lowered. (d) Calculate the total heat removed by cold water from the surface in the first 5 seconds (J/m2_). 11.234 x10-5 m 2 /s, p = 8.954 g/cm3) slab

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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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

Please help and show all steps on how answer was solved. Class is Heat Transfer. Thank you.

The ductility of a large copper (k= 386 W/m°C, a = 11.234 x10-5 m 2 /s, p = 8.954 g/cm3) slab
must be increased by quenching before it can be extruded. The copper slab is first heated up to
have a uniform initial temperature of 1,000 °C. Cold water is then sprayed onto one side of the
slab to maintain a constant surface temperature of 20 °C.
(a) Draw a simple sketch to show the change of temperature inside the slab with time.
(b) Calculate the temperature (in °C) at 10 cm below the surface 20 seconds after the surface
temperature is lowered.
(c) Calculate the heat transfer flux rate (kW/m2) through a plane 8 cm below the surface 15
seconds after the surface temperature is lowered.
(d) Calculate the total heat removed by cold water from the surface in the first 5 seconds (J/m2).

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