The Performance Investigation Of Gravitational Heat Pipe Barrel Based On Compounding Extrusion Granulator Unit

As an organic synthesis material, polyolefin has held a large market share, it is widely used in many aspects of industries, like electronic equipment, medical equipment, automotive industry, petrochemical and building materials industry, etc. Processing capacity of polyolefin on behalf of the state high polymer processing level. The mass industrialize production of polyolefin is realized by the compounding extrusion granulator unit. As an important part of compounding extrusion granulator unit, double-screw extruder is responsible for material modification and granulation production, the temperature of it affects the quality and yield of polymer. Therefore, the temperature of the extruder cylinder should be strictly controlled. Currently, the common cooling systems of the extruder's barrel are air cooling and water cooling, air cooling is applied to middle-small barrel; because of its big shock, temperature fluctuation and the cavitation vibration, the application of water cooling system is severely limited.Gravitational heat pipe is a common form of heat pipe, it realizes reflux by the gravity effect of the condensing liquid, it has the advantage of simple, cheap, and easy to manufacture etc. Excellent heat transfer performance and reliable workability make its application on various ground heat transfer equipment grows with the day.Numerical simulation is an effective way to study heat transfer characteristics and the flow of working medium inside the heat pipe just like experimental method; it can effectively predict the actual phenomenon in heat pipe operation process, the result of the research method can be used as effective reference in real design and application of the heat pipe. Based on the original gravity heat pipe's theory and experiment, the condensation heat transfer performance, heat transfer and flow performance in the gravitational heat pipe are analyzed. Through establishing the reasonable hypothesis of the condition, simplify the actual model, then build the mathematical model of heat transfer and flow process inside the heat pipe in an effective way; On the basis of the modified Nusselt laminar flow model and the VOF model, the process of condensation and heat transfer and the gravitational heat pipe's operation on a certain working conditions are simulated and analyzed, then comparing with the literature date to verify the correctness of the established mathematical model and the conditions set. Through writing a user defined function UDF to realize the mass and energy transfer, the verifying simulation method is applied to heat pipe type barrel structure, analyzing the internal overall fluid motion, the wall temperature change and the related factors, and studying parameters of temperature, and speed of condensed liquid membrane. We have verified that circumferential temperature of the wall of heat pipe type barrel has a good consistency, and discussed the multiple parameters' effect on heat transfer performance of the heat pipe. Eventually, it can provide a reliable basis for the improvement of the performance of the heat pipe and optimization of heat pipe parameter design.