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Experimental study of heat transfer in process of rolls cooling in rolling mills by water jets
Author(s) -
Raudensky Miroslav,
Bending Lothar,
Horsky Jaroslav
Publication year - 1994
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.199400922
Subject(s) - nozzle , heat transfer , heat flux , heat transfer coefficient , materials science , thermodynamics , mechanics , physics , mechanical engineering , engineering
The paper summarizes results obtained by carrying out a large set of experiments that studied cooling of rolls. The experiments are based on the cooling of a steel plate by a set of flat nozzles from a starting temperature of 615 °C. The temperature histories measured in 39 points of the test plate are the inputs to the evaluation procedure. The sensor distribution covers a surface of a size of 450 × 110 mm. Classical Beck's inverse task was extended for the 3‐dimensional area. The inverse task computes the surface distribution of heat transfer coefficient history, heat flux history and surface temperature. The results have pointed out a non‐homogeneity in cooling by means of flat jets and provide us with a comparison of the flat and the full cone jets. The possibility of the intensification of the cooling by non‐rectangular spray angle is discussed. It is shown that a certain point of saturation exists in the experimental pressure range from 0.4 to 1.2 MPa and increasing the pressure has a negligible influence on the cooling intensity.