Heat Transfer Research And Simulation Analysis On The Rotating-heat-pipe Cooling Roller Of The Mill

As the most important working components of roller mill, the performance of the rollerdirectly determines the processing of the product quality. as a result of the extrusion, shearand grinder between material and roller in the working process of the roller mill, thetemperature of the surface of the roller will raising gradually. It can not only destroy thenutrients of the flour, such as starch, vitamins and protein, but can also cause the failure ofgrinding because of the burning of materials and bonding paste on the roller and shorten theservice life of the mill. So how to effectively reduce the temperature on the surface of theroller is the top priority.Based on the former research of the rotating-heat-pipe cooling roller of the mill, studythe heat transfer of cooling roller through the experiment and the simulation analysis in orderto improve the mechanical structure, and make it better able to lower the temperature of theroller surface. The main research work of this paper is as follows:(1) By analyzing heat transfer process of the rotating-heat-pipe cooled roller, calculatethe Reynolds number and verify the initial assumption of laminar flow; Analysis andcompares the rotating heat pipe heat release and the heat generated by the roller, it isconcluded that the cooled roller can satisfy the requirement of cooling; Through analyzing theheat transfer in evaporation, and put forward the improvement plan of increasing the roll bodyinner cavity in order to improve the heat transfer rate.(2) Design and make the organic glass test tube, which is used to simulate the heattransfer of the roller, and set up the using experiment platform. according to observe the liquidflow pattern and the fluid flow trend of the organic glass test tube in different rotate speed, wehas fund that when rotate speed is400r/min, liquid flow pattern is stratified flow; when rotatespeed is500r/min, liquid flow pattern is wave flow; when rotate speed is600r/min, liquidflow pattern is lattice flow; when rotate speed is700r/min, lattice flow is very obvious.Through measuring and analyzing the temperature of every measuring point with differentliquid content(15%、20%、25%) and rotation rate, it gets that: When the liquid content is20%,there are the highest temperature rise on both ends of the measuring point; the higher therotate speed, the better the temperature raising, and this also proves that raising temperature is easier to have turbulence within a certain rang;(3) Set up a simplified physical model of the organic glass test tube. Recording to thenumerical modeling of the flow field and the temperature field within different liquid contentand different rotate speed(400——700r/min) on the basis of the VOF model of the FLUENT,we found that the temperature of intermediate heating zone is homogeneous distribution andthe temperature at both ends is highest when liquid content is20%.(4) Put forward the existing problems in this paper and further research suggestions aregiven.