Numerical simulations of momentum and heat exchange between pulverized coal particles and hot gas in blast furnace
In order to reveal the influence mechanism of the surrounding particles on the force and heat transfer characteristics for pulsedcoal particles in the blast furnace tuyere, a three-dimensional immersed boundary-lattice Boltzmann model ( IB-LBM ) based on CPU-GPU heterogeneous architecture is built. The momentum and heat transfer characteristics of three particles in tandem arrangement with fluids are studied, and the effects of Reynolds number ( 10≤Re≤100) and particle distance ( s=2D,4D) on the drag coefficient ( Cd) and average Nusselt number ( Nu) are discussed in detail. Numerical results show thatwhen the other two particles are put into the system with the existing one,the Cd of all the three particles decreases with increasing Re,and Cd1>Cd2>Cd3.Furthermore, the Nu of the three particles also increases as Re increases, and Nu1>Nu2>Nu3 . Based on the current numerical results, new correlations of Cd and Nu are constructed considering the influence of surrounding particles with the maximum errors of 2.5449％ and 0.4480％, respectively. They can be easily used for the numerical simulations of momentum and heat exchange characteristics of pulverized coal particles and hot gas during the blast furnace blowing process.
lattice Boltzmann methodthree tandem particlesdrag coefficientaverage Nusselt number
万方数据
维普
