| As social and economic progress, industrial development is very rapid,energy become more and more scarc,energy shortage has become a global problem.To ease the situation of energy shortage,every country is promoting energy saving measures, therefore, energy-saving technology has become an important issue in industry.Based on fluid mechanics theory and heat transfer theory, this paper treated the rectangular fin tube drop as the research object to analyze its characteristics of flow and heat transfer in numerical simulation methods.In the numerical simulation, first fluent software was used to simulate the flow and heat transfer performance to several different types of tubes and compared with a variety of different boundary conditons-the case of the inlet velocity.Finally, got the curve diagram of the velocity and heat transfer the velocity and flow resistance.The conclusion is that the flow and heat transfer performance of drop-tube is the best, it provides the basis for numerical simulation of rectangular fin tube drop.In addition,simulate to rectangular fin tube drop about the different boundary conditions,the different parameters on the basis of chapter III, there are face velocity, temperature, fin thickness, fin pitch, tube length.Also got the curve diagram of the heat transfer coefficient and the face velocity,thecurve diagram of the flow resistance and the face velocity.Heat transfer coefficient and flow resistance increased with the increase of face velocity.The heat transfer coefficient and resistance tubes has little influence by ambient temperature, but a great impacet on the exchange of heat.In the same fin spacing, fin thickness increased, heat transfer coefficient and flow resistance was increased.Corresponds to a certain degree of face velocity, fin spacing optimal value, and gives the best value.Finally, simulate to different tube lengths results showed that:when the tube length is 500mm,the heat transfer coefficient and flow resistance are higher than the tube length 100mm.Moreover, with the face velocity increases, the difference has increased correspondingly. |
