为数众多的计算颗粒最小流态化速度vmf的公式大体上分为3类:第1类以Ergun公式为基础,引入经验系数加以修正;第2类以某种流体力学关系为基础;第3类属于纯经验公式。这3种类型中,以第1类公式有较大范围之Ar适应性,比较适用。提出一种属于E...为数众多的计算颗粒最小流态化速度vmf的公式大体上分为3类:第1类以Ergun公式为基础,引入经验系数加以修正;第2类以某种流体力学关系为基础;第3类属于纯经验公式。这3种类型中,以第1类公式有较大范围之Ar适应性,比较适用。提出一种属于Ergun型的计算公式,从目前掌握的实验数据看来,比工程界广泛应用的Wen and Yu式用于计算液-固流态化系统有更高的精确性,最大偏差小于7.63%,均方差为5.27%,而且对球形与非球形颗粒都适用。展开更多
Minimum fluidization velocity of quartz sand and glass bead under different pressures of 0.5, 1.0, 1.5 and 2.0 MPa were investigated. The minimum fluidization velocity decreases with the increasing of pressure. The in...Minimum fluidization velocity of quartz sand and glass bead under different pressures of 0.5, 1.0, 1.5 and 2.0 MPa were investigated. The minimum fluidization velocity decreases with the increasing of pressure. The influence of pressure to the minimum fluidization velocities is stronger for larger particles than for smaller ones. Based on the test results and Ergun equation, an experience equation of minimum fluidization velocity is proposed and the calculation results are comparable to other researchers＇ results.展开更多
文摘为数众多的计算颗粒最小流态化速度vmf的公式大体上分为3类:第1类以Ergun公式为基础,引入经验系数加以修正;第2类以某种流体力学关系为基础;第3类属于纯经验公式。这3种类型中,以第1类公式有较大范围之Ar适应性,比较适用。提出一种属于Ergun型的计算公式,从目前掌握的实验数据看来,比工程界广泛应用的Wen and Yu式用于计算液-固流态化系统有更高的精确性,最大偏差小于7.63%,均方差为5.27%,而且对球形与非球形颗粒都适用。
文摘Minimum fluidization velocity of quartz sand and glass bead under different pressures of 0.5, 1.0, 1.5 and 2.0 MPa were investigated. The minimum fluidization velocity decreases with the increasing of pressure. The influence of pressure to the minimum fluidization velocities is stronger for larger particles than for smaller ones. Based on the test results and Ergun equation, an experience equation of minimum fluidization velocity is proposed and the calculation results are comparable to other researchers＇ results.
