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<p>Efficient heat transfer on the surface of billets in the secondary cooling zone during continuous casting plays an important role in improving their drawing speed and quality. Here, cold-state experiments were used to measure the water mass flux onto the surface of a casting billet in the wall jet region, and high-temperature heat transfer experiments were conducted to investigate the relationships between the surface temperature, heat flux, and heat transfer coefficient. The results show that stable film boiling occurs on the surface of the billet between 800&#xa0;°C and 1000&#xa0;°C. As the spray flow rate onto the surface of the casting billet increases from 0.1 to 0.4 m<sup>3</sup>/h, both the measured average heat flux and the average heat transfer coefficient increase by 8 pct, the former from 259.2 to 280.9 kW/m<sup>2</sup>, and the latter from 298.5 to 322.9 W/(m<sup>2</sup>·K). As the water mass flux onto the surface increases from 0.23 to 0.48 kg/(m<sup>2</sup>·s)<sup>−1</sup>, both the average heat flux measured by the casting billet and the average heat transfer coefficient increase by 40 pct, the former from 229.4 to 318.5 kW/m<sup>2</sup> and the latter from 265.2 to 370.8 W/(m<sup>2</sup>·K). The fitted empirical correlation relating the water mass flux and the heat transfer coefficient provides reliable data support for determining the thermal boundary conditions of the secondary cooling process.</p>

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Experimental Study on Film Boiling Heat Transfer in the Wall Jet Region of the Secondary Cooling Zone During Continuous Billet Casting

  • 期刊论文

  • 发表日期：

    2026年2月4日

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  • Wenxue Wang,
  • Yu Wang,
  • Zongxuan Yang,
  • Yonghong Wang,
  • Yazhu Zhang,
  • Baofeng Wang,
  • Jun Huang

摘要

Efficient heat transfer on the surface of billets in the secondary cooling zone during continuous casting plays an important role in improving their drawing speed and quality. Here, cold-state experiments were used to measure the water mass flux onto the surface of a casting billet in the wall jet region, and high-temperature heat transfer experiments were conducted to investigate the relationships between the surface temperature, heat flux, and heat transfer coefficient. The results show that stable film boiling occurs on the surface of the billet between 800 °C and 1000 °C. As the spray flow rate onto the surface of the casting billet increases from 0.1 to 0.4 m3/h, both the measured average heat flux and the average heat transfer coefficient increase by 8 pct, the former from 259.2 to 280.9 kW/m2, and the latter from 298.5 to 322.9 W/(m2·K). As the water mass flux onto the surface increases from 0.23 to 0.48 kg/(m2·s)−1, both the average heat flux measured by the casting billet and the average heat transfer coefficient increase by 40 pct, the former from 229.4 to 318.5 kW/m2 and the latter from 265.2 to 370.8 W/(m2·K). The fitted empirical correlation relating the water mass flux and the heat transfer coefficient provides reliable data support for determining the thermal boundary conditions of the secondary cooling process.