Abstract
A high thermal-efficiency impinging jet nozzle was developed by a study of nozzle structure in order to devise a photogravure press and coater-dryer of energy-saving type.
Aiming at an expansion of the high heat transfer range and turbulence promotion compared to the existing slit nozzle, a high-performance impinging jet nozzle with a heat transfer coefficient 1.5 times that of a slit nozzle was acquired through analysis and examination of the phenomenon of impinging jet heat transfer by means of trial production of about 40 kinds of nozzle, measurement of heat transfer coefficient, visualization of flow and heat transfer pattern, and measurement of jet velocity and turbulence distribution.
