کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
144548 438938 2010 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Maximum electrostatic charge of powder in pipe flow
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Maximum electrostatic charge of powder in pipe flow
چکیده انگلیسی

In dry powder process, particles collide against each other and onto wall, and normally, electrostatic charge is generated. Such a process is called trioelectrification or tribo-/contact-/impact-charging of particles. In this paper, the amount of maximum (or saturated or equilibrium) charge on a particle in a powder flow of a pneumatic conveyer with a metal pipe was discussed. A theoretical discussion involving the space charge effect with the basis of ‘charge relaxation model,’ in which the maximum charge is limited to cause gas break down, is shown. The result showed two regions in which the space charge does not affect on, and dominates the amount of the charge. The charge was proportional to the particle size raised to the power 1.5 in the region of no space charge effect, whilst power 3 in the other region of the space charge dominant. Empirically a well approximated analytical formula was found, for all over the range including these two regions. The maximum charge as a function of particle size, pipe size, and volume fraction of the powder, was given as: q/C=1.10×10-4(dp/m)3{ϕ(D/m)}2+{17.1(dp/m)1.5}. A comparison showed that the theory gives a certain overestimation to the data cited from literatures. Additional discussions were given in details.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Advanced Powder Technology - Volume 21, Issue 3, May 2010, Pages 350–355
نویسندگان
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