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首页> 美国政府科技报告 >High-intensity drying process: Impulse drying. Progress report on modeling of fluid flow and heat transfer in a crown compensated impulse drying roll: The heat transfer problem
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High-intensity drying process: Impulse drying. Progress report on modeling of fluid flow and heat transfer in a crown compensated impulse drying roll: The heat transfer problem

机译：高强度干燥过程：脉冲干燥。冠顶补偿脉冲干燥辊内流体流动与传热模型的进展报告：传热问题

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Results of this study indicate that under the conditions where the two boundaries are maintained at the same temperature, the viscous heat dissipation within the lubricant, due to viscous drag and inertial effects, plays a major role in the net heat transfer. However, when the inner surface temperature is much greater than that of the shoe, the effect of viscous heat dissipation is reduced significantly. For the conditions analyzed in this study, the regions under the solid part of the shoe, which are associated with a greater lubricant velocity, had a significant influence on the magnitude of the heat transfer from the oil to the roll; because of a greater lubricant thickness for the left-hand sub-channel, the dissipated heat, and net heat transfer under the solid part in the left-hand sub-channel was greater than that for the corresponding region in the right-hand sub-channel. Numerical techniques such as finite difference or finite element analysis should be utilized to determine the thermal performance of the press roll subjected to a temperature dependent viscosity. and other types of boundary conditions. The temperature distributions predicted from such a model should be incorporated in a finite element model to determine the stress distribution within the roll coating for various design and operating conditions.

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