振荡管流换热的影响因素

本文对振荡管流换热的层流理论公式做了改造,又从方程组无因次化导出了若干无因次参数群,再根据实验数据的整理,得到了轴向换热的经验公式,三者具有相同的形式。这种表达式具有更清晰的物理概念和方便的使用形式。 

DIMENSIONLESS PARAMETERS ON ENHANCED HEATTRANSFER IN FLUIDS BY HIGH-FREQUENCYOSCILLATIONS WITHIN PIPES

Enhanced heat transfer in fluids by high-frequency oscillations within a capillary bundle is a new interesting phenomenon. A new method to describe this phenomenon has been developed. Authors have obtained the same dimensionless expression by means of three different methods, experimental data analysis,dimensionless analysis of differential equations and transformation of laminar hydrodynamic theoretical expression. It shows that the ratio of the effective thermal conductivities to normal conductivities of fluids is proportional to a certain power of Prandtle number, second power of the ratio of tidal displacement to capillary radius and nearly first power of Womersley number. This dimensionless expression is convenient for calculating and experimenting.