Study On Flow And Heat Transfer Characteristic Of Power-Law Fluid In Porous Media By Experimental Methods

Forced convection heat transfer of water and polyacrylamide aqueous flow through two porous media test section, both sections filled with packed bronze spherical particles, is investigate experimentally. Both models are packed in simple cubic and cube center in particle. The variation trend in the pressure drop and friction factor with porous Reynolds number and influence of packed bed pattern for fluid flow for solutions of polyacrylamide (PAM) under different concentrations and temperature flowing through a porous medium have been studied experimentally. In addition, we experimented water and different mass concentrations under 20℃ flow through two porous media models which suffer constant heat flux. Analytical research skeletal structure of porous media, fluid flow velocity, mass concentration of polyacrylamide aqueous, and other factors influence on law of the heat transfer.Fluid flow experimental results show that the curvilinear trend of pressure drop changing along with porous Reynolds match with quadratic curve for polyacrylamide aqueous flow through two porous models under certain Reynolds range, while Reynolds number exceed a certain value, the curve of pressure drop with Reynolds number become flatten for high concentration solution; For the same mass concentration PAM solution, the pressure drop reduces gradually as the rise of the temperature of PAM solution flow through porous media; when Reynolds number in a lower condition, the friction factor of polyacrylamide solution linear diminish along with the rise of porous Reynolds, as the rise of Reynolds number, the curve of friction factor changing along with Reynolds number gradually transition to horizontal lines.Heat transfer experimental results show that local surface convective heat transfer coefficient increasing along with the rise of Reynolds number and decreasing along the dimensionless length direction of fluid flow. The heat exchange capability of water is the highest commeasure to PAM solution, as the rise of mass concentration of PAM solution, the convection heat transfer coefficient gradually decrease; In the case of low velocity, the model two porous media has a higher comprehensive heat transfer coefficient than model one, while Reynolds number exceed a certain value, the heat exchange capability of model one is superior to model two.