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How can the convective heat exchange of the three drum dryer be realized?

 From the point of view of heat transfer, the three drum dryer is limited by the quantity and distance of heat transfer.In industrial production, often through the flow of fluid to achieve the purpose of the transfer of heat, the relative displacement of the fluid particles caused by heat transfer, known as convective heat transfer.The three cylinder dryer relies on this convection heat transfer to achieve drying action.Three cylinder dryer heat transfer depends on the high temperature gas and heat exchange of materials, materials with high temperature water to evaporate, gas is the displacement of particles depends on fluid definition, hot gas heat transfer is through high temperature to low temperature.

Three cylinder drying machine of high temperature gas in the fluid moves close to the wall of the dryer drum will have a layer of gas for the laminar boundary layer movement, we regard the boundary layer of fluid movement is also called the laminar sublayer, mobile form laminar fluid in bottom is flat line moving on the wall of the drum surface. Because the horizontal displacement did not produce laminar layer, so the heat through the laminar bottom, only to machine high temperature gas drying in the form of heat conduction.The main transfer process in the inner layer of the three drum dryer is that the heat of the high temperature wall of the roller passes through the laminar flow bottom layer and is passed through the laminar flow bottom layer. The bottom is called laminar turbulent turbulent heat in the mainstream area, the mainstream way to convection zone transfer, the transfer process must be in accordance with the transfer order transfer, also cannot lack cannot be reversed.

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