THE RELATION OF THE THRESHOLD VELOCITY OF COAL DUST TO ITS SIZE AND HUMIDITY

摘要

On the ground of wharf and a station where coal is piled up,the sources polluting theatmosphere are mainly the raised coal dust.According to the principle of mechanics,withthe consideration of the gravities of coal dust particles and liquid droplets,coal dust size andhumidity,under the condition of force balance when the coal dust was raised,the authorsobtained a theoretical formula for the threshold velocity of coal dust with humidity.Finally,the theoretical values from the formula gave a good agreement with the experimental datafrom some wind tunnels.