TED-AJ03-579 Improvement of Gas-jet Cooling Heat Transfer

概要

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In steel making process various method of cooling are used. In this paper the examination is performed about the improvement in cooling rate of gas jet cooling of the steel plate in the steel manufacture process. The examination is carried out from two viewpoints, which is, the improvement of nozzle structure and the change of gas kind. At the first viewpoints of nozzle structure, installing a small pillar at the tip of a nozzle, it is shown experimentally that the heat transfer ratio around the stagnation point is increased and the effect of installing pillar is increasing the turbulence of the potential core domain of the jet stream. The efficiency of power is also discussed compared to increasing the velocity of the gas-jet. At the second viewpoints of gas kind, the heat transfer characteristic related to the mixing ratio of helium to air is shown. Because of high thermal conductivity of helium, the heat transfer coefficient of the helium impinging gas-jet is higher than that of the air gas-jet at the same jet velocity. It is also discussed about the change of heat transfer coefficient of the mixed gas under the relationship between Re number and Nu number. [figure]
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