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Research Papers

Investigation of Cooling Process of a High-Temperature Hollow Cylinder in Moving Induction Heat Treatment

[+] Author and Article Information
H. Shokouhmand

School of Mechanical Engineering,College of Engineering,  University of Tehran, Tehran 14399-56191, Iranhshokoh@ ut.ac.ir

S. Ghaffari1

School of Mechanical Engineering,College of Engineering,  University of Tehran, Tehran 14399-56191, Iransghaffari@ ut.ac.ir

1

Corresponding author.

J. Thermal Sci. Eng. Appl 4(1), 011001 (Feb 24, 2012) (10 pages) doi:10.1115/1.4005602 History: Received August 20, 2011; Revised October 10, 2011; Published February 21, 2012; Online February 24, 2012

The hardness of heat treated steel and probability of occurrence of quenching cracks depend on the cooling time and temperature distribution. Therefore, the investigation of cooling process is a crucial issue in heat treatment to evaluate the obtained structure of the work-piece. In the present work, a vertical hollow circular cylinder is heated up to a specific temperature by a moving coil at a given velocity along it, and the heated parts then quenched by a moving water–air spray. After passing the spray, the cylinder is cooled by natural convection with the surrounding air. An analysis of coupled magnetic problem and transient conjugated thermal problem between the solid and the surrounding air is performed using finite-element method to obtain temperature field in each time step. This procedure includes moving boundary conditions, effect of radiation with ambient, temperature-dependent properties, and change in magnetic permeability of specified alloy at the Curie temperature. The obtained results show how both spray and natural cooling affect the temperature distribution and rate of cooling of the cylinder. Furthermore, the effect of geometry and velocity of coil on the rate of cooling and chance of quenching cracks are investigated.

Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Physical model of problem

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Figure 2

Domain of solution

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Figure 3

The exhibition of the cylinder and the coil and their relative initial positions

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Figure 4

The temperature-time histories at points of A,B,C,D,E, and F of the hollow cylinder

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Figure 5

Radial variation of temperature at a specific axial position of z = 20 cm at the time of 170 s and 300 s

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Figure 6

Distribution Nu due to spray cooling and natural convection along the cylinder outer surface at 160 s after beginning of the process

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Figure 7

The distribution of the temperature along the external surface of cylinder for the five different times of 25 s, 125 s, 190 s, 225 s, and 250 s

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Figure 8

The distribution of Nusselt number due to spray cooling for three different velocities of coil when the spray is located at the position of z = 20 cm

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Figure 9

Radial variation of temperature at the specific axial position of z = 20 cm when the spray is located at the same position for three different velocities of the coil

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Figure 10

Distribution of Nusselt number due to spray cooling for three different inner to outer radius ratios of the cylinder when the spray is located at the position of z = 20 cm

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Figure 11

Radial variation of temperature at the specific axial position of z = 20 cm when the spray is located at the same position for three different inner to outer radius ratios of the cylinder

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Figure 12

The distribution of Nusselt number due to air cooling for three different velocities of coil

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Figure 13

Radial variation of temperature at the specific axial position of z = 20 cm for three different velocities of the coil

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Figure 14

The distribution of Nusselt number due to air cooling for three different inner to outer radius ratios of the cylinder

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Figure 15

Radial variation of temperature at the specific axial position of z = 20 cm for three different inner to outer radius ratios of the cylinder

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