کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6590602 | 456858 | 2015 | 15 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Enhancement of mass transfer in spacer-filled channels under laminar regime by pulsatile flow
ترجمه فارسی عنوان
افزایش انتقال جرم در کانال های پر از اسپکترومتری تحت رژیم لاپاراسکوپی با جریان پالسیتی
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کلمات کلیدی
جریحه دار گام خلع سلاح جریان، افزایش انتقال جرم، اسپیلر نوع مش، محدود کردن جریان، ماژول های زخم اسپیرال،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
چکیده انگلیسی
Improving mass transfer in membrane modules is always desirable, but not easily achieved under laminar regime. Pulsatile flow induced by a solenoid valve was investigated as a technique to improve mass transfer in membrane modules with spacer-filled channels. Mass-transfer coefficients were measured by the limiting current technique in open and spacer-filled narrow rectangular channels, both for steady-state flow and pulsatile flow, at Reynolds numbers ranging from 10 to 50 (based on the channel height). The test cell had a narrow rectangular channel (170Â mmÃ15Â mmÃ2Â mm) and 8 consecutive nickel electrodes (11.2Â mm long and 10Â mm wide) fitted in the top wall, with and without spacer inside the flow channel. The pulsatile flow followed a step function with three different frequencies (1, 10 and 50Â Hz) and two different duty cycles (fraction of time during which the valve is closed in each pulse) of 25% and 50%. The results show that pulsatile flow generated with solenoid valves with frequencies between 10Â Hz and 50Â Hz can increase up to 50% the mass-transfer coefficient in membranes modules with spacer-filled channels, operating in laminar flow. The effect is particularly intense near the channel outlet, close to the solenoid valve, but vanishes for large distances from the channel outlet.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Engineering Science - Volume 123, 17 February 2015, Pages 536-541
Journal: Chemical Engineering Science - Volume 123, 17 February 2015, Pages 536-541
نویسندگان
Carina Rodrigues, Miguel Rodrigues, Viriato Semiao, VÃtor Geraldes,