Secondary spray cooling control has become one of the major factors for defect-free continuously cast slabs. Measuring the actual heat transfer coefficient and understanding the cooling performance for a spray cooling nozzle under various casting conditions is a very difficult task. Until now, all spray nozzle suppliers and caster machine builders still relied on utilizing the so-called water collector box with segmented slots to design and evaluate spray nozzles. The simple assumption is that the one-dimensional water profile collected from the water box can represent a two-dimensional cooling profile on the slab surface. Therefore, achieving
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