Heat Transfer Analysis on Double-skin Air Tube in Ventilation of Deep Mine Heading Face

摘要

For the high temperature at heading face in deep mines, double-skin air tube was analyzed based on the theory of heat transfer and hydrodynamics, and it is recommended that the condition of air layer between two tubes is an important factor in thermal insulation. According to the ventilation of heading face in deep mine, the distribution of velocity and the temperature of the air within tube were simulated by using ANSYS software, and the thermal insulation effect was discussed. The result indicates that double-skin air tube has good effect on thermal insulation, and the number of air intakes and the thickness of the air layer are two important factors to the thermal insulation effect. The thermal insulation effect drops by increasing the number of air intakes. When the air layer thickness is less than 20mm, the outlet temperature decreases significantly. Conversely, the temperature decreases unnoticeably.