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Impinging jets have many applications, including the heating or drying of food, paper, printer’s ink, tissue, textiles, chemicals, film, and the cooling of electrical equipment, turbine, and combustor components. They are also used in glass, metal, and plastics processing. The advantages of impinging jet systems include the ability to control local heat transport rates by varying not only flow rate and temperature, but also geometric parameters such as jet diameter, jet-to-jet spacing, and jet-to-surface distance.