Inverse Determination Of The Heat Transfer
Coefficient Distribution On A Steel Plate
Cooled By A Water Spray Nozzle
Author(s)
A. Cebo-Rudnicka, Z. Malinowski, T. Telejko & J. Gielzecki
Abstract
Water spray cooling plays an important role in the steel industry. Continuous
casting lines are equipped with the system of water spray nozzles installed in the
secondary cooling zones. In the hot rolling mills the spray or laminar cooling
systems are employed to reduce the strip temperature before coiling. A suitable
rate of cooling must be employed to ensure a proper temperature drop of
the worked out material in order to achieve desired properties. Quality of
the numerical simulations of the temperature field of the cooled object strongly
depends on the thermal boundary conditions. In the literature only average
or maximum values of the heat transfer coefficient while spray cooling are
available. The experimental stand, numerical models and dedicated software
have been developed to study the heat transfer coefficient distribution on the
surface of the steel plate cooled by the water sprays. The steel plate is heated in
the electric furnace up to the temperature of 907oC. Next, the hot plate is pushed
to the cooling chamber and cooled by the water spray nozzle. The plate
temperature has been measured by the 25 thermocouples. The measurements
have been employed to determine the distribution of the heat transfer coefficient
on the plate surface. The inverse method based on the three dimensional finite
element model of the heat conduction in the plate has been employed. The finite
element model is based on nonlinear shape function. The heat transfer coefficient
varies significantly over the cooled surface of the plate and strongly depends on
the plate temperature.
Keywords: heat transfer coefficient, inverse method, spray cooling, three
dimensional model.
Keywords
heat transfer coefficient, inverse method, spray cooling, three
dimensional model.
Related Book
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