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Title: A study of the cooling effect of water sprays on steel strip at high temperatures
Author: Fry, J. C.
Awarding Body: University of Wales Swansea
Current Institution: Swansea University
Date of Award: 1998
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To meet customers' demands for increased quality and product consistency, together with the production of a wider range of steels there is a need for accurate temperature control throughout the whole cooling path on the hot Strip Mill. This requires a cooling system that couples the required cooling rate with the heat transfer capabilities of the water spray system and the production speed and line length, however, information on the heat transfer characteristics of water sprays is sparse. Therefore, the project described in this thesis has investigated the heat transfer characteristics of water sprays. The project has been two fold. Initially a steady state test apparatus has been designed, built and commissioned which allows the heat transfer coefficient of a single pressure atomised water spray to be evaluated under various operating conditions. Secondly, the apparatus has been used to conduct experiments on two commercially available spray nozzles with the aim of determining the relationship between the spray operating conditions and the heat transfer coefficient. The work has demonstrated that a steady state technique can be used to determine the heat transfer coefficient of a spray at surface temperatures between 650°C and 950°C. The experimental work has shown that the heat transfer coefficient increases with increasing surface temperature, increasing flow rate and decreasing stand off distance. For the two nozzles tested correlation equations have been derived which allow the heat transfer coefficient to be evaluated in terms of the surface temperature, flow rate and stand off distance. Finally, the application of the correlation equations to the design and improvement of water cooling lines has been considered.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (D.Eng.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available