摘要
本文在总结与评价前人工作的基础上,提出了物质微元细观分布形态的片状结构假定。同时,将湍流能谱用于运动学分析,给出了微元的变形规律,λ=λ_Kexp[-0.1(ε/v)^(1/2)t]。微观扩散过程的数学分析表明,微观混和区的宽度趋于一定常值δ=10λ_B,而其体积则呈指数规律增长 v～exp[0.1(ε/v)^(1/2)t]。从而可以将微观混和看成是物料的“稀释”过程或微元的体积膨胀过程。
A Slice structure,which is opposite to the lamellae structure proposed by other authors,was suggested to describe micromixing between different materials.The deformation of the slice can be described by the equation derived from fluid dynamical consideration λ=λ_Kexp[-0.1(ε/v)^(1/2)t] Analysis of the diffusion between the slice and the environment showed that the width of mi- cromixing zone approaches to a constant value δ=10λ_B while the volume of the diffusion zone increases exponentially with time v～exp[0.1(ε/v)^(1/2)t] Thus,micromixing can be regarded as a“dilution”or volume expansion process of the feed-in materials.
出处
《化学反应工程与工艺》
CAS
CSCD
北大核心
1990年第4期15-22,共8页
Chemical Reaction Engineering and Technology
基金
国家自然科学基金(1880364)
