Attainment of more precise parameters of a mathematical model for cooling flat and cylindrical hot surfaces by nozzles

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Small air-mist nozzles used in continuous casting process were tested to determine the intensity of cooling. These nozzles are used in the secondary cooling casting equipment. The first distribution was measured impact pressure. Intensity measurements were carried out with different cooling temperature of the cooling water. Cooling water temperature ranged from 20 degrees Celsius to 80 degrees Celsius. It has been surprising conclusion, it was found that the temperature of the cooling water has a strong influence. Most positions were affected Leidenfrostovy temperature, which has shifted towards lower temperatures. Range of cooling water temperature from 20 degrees Celsius to 80 degrees Celsius caused the displacement Leidenfrostovy temperature of 130 degrees Celsius. This significant change and can change the nature of the die casting machine. It was also discovered an interesting fact, which increases the cooling intensity by increasing the temperature of the cooling water in areas with high temperature (above Leidenfrostovou temperature) makes very little difference in the cooling intensity (about 30 watts per squere meter Kelvin and čtvrečný). Surprisingly, a significant difference was found in Leidenfrostově temperature in the situation where the temperature difference between the water was only 20 degrees Celsius. This difference was almost 100 degrees Celsius. Experiments with increased temperature showed a high sensitivity cooling on this variable. The relationship between the temperature of the cooling water and cooling intensity is especially important at high intensities.

mathematical model, cooling

2000-06-19

WIT Press

Madrid, Spain

1-85312-818-X

Advanced Computational methods in Heat Transfer VI

627–635

10