کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
156111 456922 2011 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Mixing times for process vessels with aspect ratios greater than one
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Mixing times for process vessels with aspect ratios greater than one
چکیده انگلیسی

Stirred tank reactors are one of the most important and common pieces of equipment used in speciality, pharmaceutical, and agrichemical processes. It is also typical for these to be operated at large aspect ratios; however, there is very little information in the open literature about mixing times in vessels with aspect ratios greater than one. This paper aims to provide new information in this area that will enable the design of better reactors.Electrical resistance tomography is used to monitor the mixing time of systems with aspect ratios higher than one. The mixing time has been measured on vessels of 0.914 and 0.610 m diameter with Cowles disc, Rushton turbine and mixed flow type impellers to aspect ratios of 2. The current correlation of choice, by Grenville and Nienow (2004), has been compared with the results and found to under predict the mixing time at aspect ratios greater than one. The exponent on the H/T term has been explored and it has been found that this varies with agitator type, this information has never been shown before.The affect of adding a second impeller on the mixing time and flow pattern is also investigated. Adding a second Rushton turbine creates zoning in the vessel which impedes the mixing; this can be visualised using electrical resistance tomography.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Engineering Science - Volume 66, Issue 13, 1 July 2011, Pages 2935–2944
نویسندگان
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