流化床为在一容器中,在气流作用下使一些惰性小粒子(如由氧化铝颗粒组成)被加热和流化,工件悬置流化床中被良好加热。它具有较高的传热性能和温度的均匀性,成功的被应用于连续热处理过程。研究指出流体的速度与给热系数之间存在一定的函数关系。当流体速度达到V_(最佳)时给热系数h为最大。实际的给热系数取决于流化气体的速度和热传导率,流化粒子尺寸、重度和热物理性质,以及炉子的几何形状和结构等特点。通常,随着粒子尺寸减小 The fluidized bed is where in a vessel some inert small particles, such as alumina particles, are heated and fluidized under a stream of air and the workpiece is well heated in the fluidized bed. It has a high heat transfer performance and temperature uniformity, the successful application of continuous heat treatment process. It is pointed out that there is a certain relationship between the fluid velocity and the heat transfer coefficient. When the fluid velocity reaches V_ (best), the heat coefficient h is the maximum. The actual heat transfer coefficient depends on the velocity and thermal conductivity of the fluidizing gas, the size of the fluidized particles, the severity and thermophysical properties, and the geometry and structure of the furnace. Normally, as the particle size decreases