There is heat transfer between any objects. Today we are going to talk about the heat transfer in the refractory material of ceramic fiber blanket.
Heat transfer is a complex phenomenon, and it is often divided into three basic methods, namely heat conduction, heat convection and heat radiation.
The thermal conductivity of the ceramic fiber blanket decreases as the volume density increases, but if the decrease is gradually reduced, then the thermal conductivity will increase when the density exceeds a certain range. At different temperatures, the smallest thermal conductivity corresponds to the smallest volume density, and the smallest thermal conductivity corresponds to the volume density that increases with the increase in temperature.
The above is of great significance to the application of ceramic fiber blanket. The thermal insulation performance of ceramic fiber uses the thermal insulation effect of the enclosed air in the pores of the product. When the solid fiber reaches a certain specific gravity, the volume density will decrease with the increase of the porosity.
When the slag ball content reaches a certain proportion, the influence of bulk density on the thermal coefficient of conduction vb actually refers to the effect of porosity, pore size and pore properties on the thermal conductivity. When the volume density is less than 96Kg/m3, due to the oscillating convection of the gas in the mixed structure, The radiation heat transfer is enhanced, and the thermal conductivity decreases with the volume density, showing an increasing trend in an exponential function relationship. When the bulk density is greater than 96Kg/m3, when the bulk density increases, the pores in the fiber are closed, and the micropores increase, the air flow in the pores is restricted to a certain extent, and the amount of heat transfer in the fiber decreases (the thermal resistance increases). As a result, the heat transfer through the radiation between the wall of the hole is reduced, and the thermal conductivity is reduced.
When the volume density increases to a certain range from 240 to 320Kg/m3, the solid fiber contact points increase, and the solid fiber contact points increase, so that the resistance of the pores to heat transfer is weakened, and the thermal conductivity will no longer decrease, but will increase.
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