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Title of Journal: Heat Mass Transfer

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Abbravation: Heat and Mass Transfer

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Springer Berlin Heidelberg

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DOI

10.1016/0022-3093(87)90283-3

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ISSN

1432-1181

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Ultra fast cooling of hot steel plate by air atomi

Authors: Soumya S Mohapatra Satya V Ravikumar Jay M Jha Akhilendra K Singh Chandrima Bhattacharya Surjya K Pal Sudipto Chakraborty
Publish Date: 2013/11/20
Volume: 50, Issue: 5, Pages: 587-601
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Abstract

In the present study the applicability of air atomized spray with the salt added water has been studied for ultra fast cooling UFC of a 6 mm thick AISI304 hot steel plate The investigation includes the effect of salt NaCl and MgSO4 concentration and spray mass flux on the cooling rate The initial temperature of the steel plate before the commencement of cooling is kept at 900 °C or above which is usually observed as the “finish rolling temperature” in the hot strip mill of a steel plant The heat transfer analysis shows that air atomized spray with the MgSO4 salt produces 15 times higher cooling rate than atomized spray with the pure water whereas air atomized spray with NaCl produces only 12 times higher cooling rate In transition boiling regime the salt deposition occurs which causes enhancement in heat transfer rate by conduction Moreover surface tension is the governing parameter behind the vapour film instability and this length scale increases with increase in surface tension of coolant Overall the achieved cooling rates produced by both types of salt added air atomized spray are found to be in the UFC regime

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