The Effect of Surface Coating Layer on Air-Water Mist Cooling of Hot Metals
The Effect of Surface Coating Layer on Air-Water Mist Cooling of Hot Metals
复制标题
表面涂层对铁水空气水雾冷却的影响
DOI：
10.3327/jnst.35.477
复制
发表时间：
1998
影响因子：
1.2
通讯作者：
M. Sako
中科院分区：
文献类型：
--
作者：
Y. Kikuchi;Koichi Tatsuta;M. Sako
本文研究了涂有一层薄薄的低导热率材料的铁水向空气-水混合物雾流的瞬态沸腾传热。本实验使用的测试样品是银和不锈钢盘，其传热表面涂有耐火涂料，厚度范围为3-38μm。将加热到750°C的圆盘垂直投入雾流中，并在大气压下冷却至空气-水混合物的温度。水的质量速度范围在0.04至0.78kg/m2.s之间。空气速度从3到7m/s变化。该涂层极大地增强了传热，特别是在过渡和薄膜沸腾区域。这种增强随着涂层厚度的增加而变得更高，因为最小薄膜沸腾温度变得更高并且从薄膜到过渡沸腾的转变发生得更早。尽管水的质量速度对空气速度的依赖性较弱，但传热会随着水的质量速度的增加而增强。
This paper deals with transient boiling heat transfer to mist flow of air-water mixture from hot metals coated with a thin layer of low thermal conductivity material. The test specimens used for the present experiment are silver and stainless steel disks whose heat transfer surface is coated with a refractory paint over the thickness range, 3–38μm. The heated disk of 750°C is plunged vertically into the mist flow and is cooled down to the temperature of air-water mixture under atmospheric pressure. The mass velocity of water ranges between 0.04 and 0.78kg/m2.s. The air velocity is varied from 3 to 7m/s. The coating produces a great enhancement in heat transfer, especially in transition and film boiling regions. This enhancement becomes higher with increasing coating thickness since minimum film boiling temperature becomes higher and an earlier transition from film to transition boiling occurs. Heat transfer is more enhanced as mass velocity of water increases although it has a weak dependence on air velocity.