Simulation And Experimental Research Of Combined Rotors’ Heat Transfer Enhancement In Hegh Viscosity Fluid

In this world, any activity of human beings cannot leave the energy. High quality energy and how to make better use of energy are necessary for the social development. Nowadays, energy shortage problem is increasingly serious, and has been paid wide attention to by all over the world. In order to solve the energy problem, we should not only strengthen the exploitation of all kinds of new energy, but also make reasonable and efficient use of existing energy sources. As a kind of common heat exchange equipment, the shell-and-tube heat exchanger is active in a variety of industrial applications. Its internal mediums are diverse, but mostly are mixed up with dirt and impurities. The impurities deposited on the surface of tube not only affect the thermal efficiency, but also form great hidden troubles to equipment operation safety.The theoretical basis, classification and research status at home and abroad of heat transfer enhancement were introduced briefly in this paper, then the inserts in the tube were studied thoroughly. First of all, the comprehensive heat transfer performance of tubes assembly with spiral two blades rotors and spiral two blades rotors with axle were simulated by FLUENT. The Nusselt, friction coefficient and PEC were compared, and the flow field, velocity field, temperature field and turbulent kinetic energy of one special cross section were analyzed in the article. At the same time, vortex length of single spiral two blades rotor in the fluid with high viscosity was analyzed.The heat transfer and friction characteristic of grooved helical two blades rotors and spiral three blades rotors with different arrangement ways were studied experimentally. And the better way of arrangement was obtained.The effect and influence of widgets on heat transfer enhancement was introduced in this paper. Also, the stresses and deformations of ready-packaged widget with low flow resistance and inner guide widget with holding tight by itself in practical application were simulated by ANSYS. In the meantime, two new structures of widgets were introduced.