Study on enhancement mechanism of mixing and heat transfer of field-synergetic elongation screw
Based on the principle of polymer field-synergistic plasticization,transportation and mixing,a field synergistic elonga-tion element with a new structure of field-synergistic elongation screw was designed and developed for enhancing mixing and heat transfer.The ANSYS Polyflow was employed to numerically simulate ordinary double head threaded screws and field synergis-tic elongation screws with different elongation element arrangements.The effects of screw configuration on the mixing perfor-mance,heat transfer performance,and plasticization uniformity of polymeric rubber were comparatively analyzed.The results indicated that the comprehensive performance of the field synergy elongation element was superior to that of the ordinary thread-ed screw.Among these screws,the heat transfer performance of screw B with concentrated arrangement of field synergy elonga-tion element was the best,and the mixing performance of screw F with the dispersed arrangement of field synergy elongation ele-ment was the best.The radial convergence channel of the elongation element in the field synergy elongation element changed the direction of the velocity field,generating radial components in the velocity vector.This promoted the synergistic interaction be-tween the velocity field and the temperature gradient and velocity gradient fields,increasing the stretching flow and deformation in the flow field and strengthening the heat and mass transfer and transportation process.
the principle of field synergyfield synergy elongation screwenhance heat and mass transfer
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