کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
163036 457250 2011 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
On the Sauter mean diameter and size distributions in turbulent liquid/liquid dispersions in a stirred vessel
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
On the Sauter mean diameter and size distributions in turbulent liquid/liquid dispersions in a stirred vessel
چکیده انگلیسی

It has been customary to relate the Sauter mean drop size, d32, to Weber number, We, by the relationship . This relationship comes from the assumptions that d32 is a constant fraction of dmax, where dmax is the maximum stable drop size and that dmax can be predicted from theoretical considerations if Kolmogoroffs theory of isotropic turbulence is used for estimating the disruptive forces. Here it is shown, firstly on theoretical grounds, that the assumption d32∝dmax is not justified; and secondly that experimental results from 18 different runs neither support d32=Admax where A is system and agitation conditions independent nor that the exponent on We is −0.6. Further, though cumulative volume size distributions indicate self-similarity, as suggested previously, the number probability density distributions show strong bi-modality at low speed and low dispersed-phase concentration which lessens with increasing concentration and becomes uni-modal at high speeds. This study suggests that in spite of the great deal of work which has already been done, more is required in which the relationship between mean drop size and drop size distributions and agitation conditions over a wider range of concentrations are further investigated.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Engineering Science - Volume 53, Issue 11, 1 June 1998, Pages 2005–2011
نویسندگان
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