Abstract
A review of the current understanding of heat transfer from quenched alloy products to water sprays is presented. A numerical example is described to demonstrate how controlled spray cooling of products containing sections of differing thicknesses significantly reduces thermal gradients. A semi-expert computer-aided design (CAD) system is proposed for optimizing the process of spray quenching following extrusion, forging, or continuous casting. A systematic experimental approach to the problem of providing a universal heat transfer data base for the proposed CAD system is presented.
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Abbreviations
- cp :
-
specific heat of alloy at constant pressure (J/kg K)
- d:
-
drop diameter (mm)
- h:
-
convection coefficient (W/m2K)
- k:
-
thermal conductivity of alloy (W/m K)
- P:
-
pressure (kPa)
- q:
-
local heat flux (W/m2)
- Q:
-
local volumetric spray flux (m3 s−1/m2)
- t:
-
time (s)
- T:
-
temperature (°C)
- ΔTS :
-
T s−T sat (°C)
- u:
-
drop velocity at impingement (m/s)
- p:
-
density of alloy (kg/m3)
- f:
-
inlet water conditions
- i:
-
initial
- s:
-
metal surface
- sat:
-
saturation
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Deiters, T.A., Mudawar, I. Optimization of spray quenching for aluminum extrusion, forging, or continuous casting. J. Heat Treating 7, 9–18 (1989). https://doi.org/10.1007/BF02833183
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DOI: https://doi.org/10.1007/BF02833183