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Show • The propose~ DFI.rapid heating technology can be most advantageously used for heating large parts, Includmg slab and billet reheating and continuous bar and strip heating in steel mills. • The D FI system requires minimal initial heat up before operation, and, as a result, increased flexibility for production scheduling is possible. NOMENCLATURE P - normalized pressure; do - internal nozzle diameter, m g - fuel mass concentration·, m' g - turbulent concentration fluctuation; mox - oxygen concentration; T' - turbulent temperature fluctuation; It - linear scale of turbulence; U, V - velocities in x and y direction, respectively; x - coordinate along jet axis; J.l - turbulent viscosity; p - density; E - turbulence dissipation energy; k - turbulent kinetic energy; qt - total heat flux; Clr - radiation heat flux; T g - temperature of combustion products; T w - temperature of calorimeter surface. REFERENCES 1. A.Milson & N.A. Chigier, Studies of Methane and Methane-Air Flames Impinging on Cold Plate. Combustion and Flame ,21, pp.295-305 (1973) 2. Masters, Productive Developments in Heating and Heat Treatment. Metallurgy and Metal Forming., 41,N l,pp.13-22, (1974) 3. Assaturov, P.G. Krasnokutsky & P.S. Berkovskaya. Rapid Jet Heating of Metal. Kiev, Technica, 1984.(Russ) 4. Bergauz & E.!. Rosenfeld. Enhancement of Efficiency of Fuel Combustion in Thermical and Heating Furnaces, 1984, Leningrad, Nedra (Russ) 5. Daihly, Application for gas-fired rapid heating., Metallurgy furnaces Supplement, 61, No 12, pp. FUS I,FUS4,FUS6, (1994) 6. Beer & N.A. Chieger., Combustion and Flame, 12, pp.575-586, (1968) 7. Viskanta R., Heat transfer to impinging isothennal and flame jets. Experimental Thennal and Fluid Science, 6,111-134, (1993) * 8. Baukal & B. Gebhart, A Review of Flame Impingement Heat Transfer Studies. Part 1: Experimental Conditions. Combustion Science and Technology, 104, pp. 339-357 15 |