Pulse Gas Flow Field Numerical Simulation Of Temperature Field

Flow state of the air which is in the pulse air drier has a significant effect on its internal material drying. This study using the commercial software Fluent to simulate pulse air flow field and temperature field inside the pulse airflow drier, and analyze it. It can provide theoretical guidance for deeply understanding pulse airflow drying mechanism and the dryer design improvements.This study focuses on the subject of pulse airflow drying machine, based on the theory of computational fluid dynamics (CFD), the Navier-Stokes equations as control equations, the standard k-ε turbulence model, and use Fluent software to carry on the 3D steady state simulation for the air flow field and temperature field inside pulse airflow drier, the results are as follows:In the case of straight pipe for simulating airflow drying, the inlet velocity, the greater the drying effect is bad, this is because in the case of straight pipe material to temperature balance basically in the second half of the line, and the increase of inlet velocity will reduce material in dry period of time, cause energy loss and does not guarantee the material dry to qualified.The pulse airflow drying machine drying section are numerically simulated. Considering the gravity of the situation, get dry period of internal flow field of velocity, pressure, particle trajectory, etc., and these data are analyzed and compared. Through numerical simulation:the pipeline of pulse is to improve the material and the main function of the relative velocity of air, the relative speed difference, the greater the material dispersion in the larger the surface area of hot medium, the surface moisture to evaporate quickly. Dramatic change of each parameter of the phase mostly in line at the entrance to the and rising period of impulse pipe of the bent pipe connection between the particles in the turning period of the first half, drying has been basically completed, this shows that the pulse line for material drying has a good role in promoting, but increase the pulse line will inevitably increase the loss of energy, so in considering the drying efficiency of the energy loss must be considered at the same time.