东南大学学报（自然科学版）Issue(4)：756-763,8.DOI:10.3969/j.issn.1001-0505.2014.04.014
丝状颗粒在滚筒横向截面中的传热传质特性
Heat and mass transfer characteristics of filamentous particles in transverse section of rotary dryer
摘要
Abstract
On account of drying inequality problem of filamentous materials in the rotary, a mathe-matical model for heat and mass transfer of filamentous particles based on the discrete element meth-od was proposed according to drying mechanisms, and then it was used to numerically study the tem-perature and moisture content evolution of filamentous materials in the transverse section of a rotary dryer.The effectivity of this model was verified by experiments.The results show that the change of the temperature of the cylinder wall has a direct and significant impact on the heat and mass transfer characteristics of filamentous particles.At the initial stage of drying, the standard deviation of the particles temperature increases rapidly, but then it reduces gradually with the dying time.And the standard deviation of the moisture content also increases rapidly at the initial stage of drying.When the certain drying conditions or the drying time is met, the uniformity of moisture content of filamen-tous particles inside the cylinder will be better and better.The heat flux of filamentous particles mainly obtains from the high temperature wall, especially from the cylinder wall.Compared with the lifting type baffle, the uniform type baffle can make the temperature distribution and the moisture content distribution of the particles on the transverse section of the cylinder more uniform.关键词
丝状颗粒/滚筒干燥器/传热传质/标准偏差Key words
filamentous particle/rotary dryer/heat and mass transfer/standard deviation分类
化学化工引用本文复制引用
朱立平,秦霞,袁竹林,闫亚明,罗登山,李斌..丝状颗粒在滚筒横向截面中的传热传质特性[J].东南大学学报（自然科学版）,2014,(4):756-763,8.基金项目
郑州烟草研究院烟草工艺重点实验室基金资助项目． （）
