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مطالعه تجربی تأثیر ویژگی‌های فیزیکی سیال و دمای کارکرد بر روی انتقال گرما در پمپ رسانشی | ||
| نشریه مهندسی مکانیک امیرکبیر | ||
| مقاله 15، دوره 53، شماره 3، خرداد 1400، صفحه 1607-1620 اصل مقاله (1.73 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22060/mej.2019.16182.6297 | ||
| نویسندگان | ||
| محرم جعفری* 1؛ اسماعیل اسماعیل زاده2؛ نوید فرخی3 | ||
| 1هیات علمی/دانشگاه تبریز | ||
| 2هیئت علمی، دانشگاه تبریز | ||
| 3گروه مهندسی مکانیک، دانشکده فنی مهندسی مکانیک، دانشگاه تبریز، تبریز، ایران | ||
| چکیده | ||
| در مقاله حاضر با انجام تست‌های تجربی، انتقال گرما در پمپ رسانشی با استفاده از الکترودهای مسطح برای دو مایع دی‌الکتریک نرمال-هگزان و نرمال-دکان به‌عنوان سیال عامل مورد مطالعه قرار گرفته است. این پژوهش برای ضخامت‌های مختلف فیلم سیال و با در نظر گرفتن ولتاژ الکتریکی متغیر، انجام شده و اثرات پارامترهای مختلف مانند ویژگی‌های فیزیکی (اختلاف تحرک یونی، چگالی و گرانروی) و هم‌چنین دمای کاری سیال بر عملکرد انتقال گرمای پمپ بررسی شده است. نتایج نشان می‌دهد که بالاتر بودن اختلاف تحرک یونی سیال دی‌الکتریک و هم‌چنین پایین‌تر بودن چگالی و لزجت، به‌دلیل بهبود کیفیت تشکیل گردابه‌ها در همسایگی الکترودها باعث افزایش دبی جریان و افزون بر این به‌دلیل ایجاد جریان آشفته در اطراف الکترودها موجب افزایش بسیار قابل‌توجه انتقال گرما در پمپ می‌شود. از سوی دیگر بیشتر بودن دمای کاری نیز به‌سبب کاهش چگالی و گرانروی و هم‌چنین افزایش گرادیان دما بین منبع و مقصد انتقال گرما باعث بالارفتن دبی و انتقال گرما می‌گردد. افزایش شدید انتقال گرما با استفاده از پدیده رسانش الکتریکی در مقایسه با گذر معمولی جریان از درون یک مجرای ساده (فاقد الکترود) برای تمام ضخامت‌های مختلف فیلم و دماهای کاری مشاهده می‌شود. بیش‌ترین مقادیر افزایش عدد ناسلت برای نرمال-هگزان و نرمال-دکان به‌ترتیب برابر 1041 و 568 درصد مشاهده می‌شود. | ||
| کلیدواژه‌ها | ||
| الکتروهیدرودینامیک؛ پمپ رسانش الکتریکی؛ اختلاف تحرک یونی؛ افزایش انتقال گرما؛ عدد ناسلت | ||
| عنوان مقاله [English] | ||
| Experimental Study of the Effects of Fluid Physical Properties and Working Temperature on Heat Transfer in Conduction Pump | ||
| نویسندگان [English] | ||
| Moharram Jafari1؛ Esmaeil esmaeilzadeh2؛ Navid Farrokhi3 | ||
| 1Mechanical Engineering Faculty/University of Tabriz | ||
| 2Faculty of Mechanical Engineering, University of Tabriz | ||
| 3Department of Mechanical Engineering, Faculty of Mechanical Engineering, University of Tabriz, Tabriz, Iran | ||
| چکیده [English] | ||
| In the current paper, heat transfer in conduction pumping of n-hexane and n-decane dielectrics (as working fluids) using flush electrodes is investigated by conducting experimental tests. The Study has been carried out for different fluid film thicknesses and variable applied electric voltage, and the effects of various parameters such as physical properties (ion mobility difference, density and viscosity), as well as fluid working temperature on heat transfer performance of the conduction pump have been investigated. The results show that higher ion mobility difference, as well as lower density and viscosity, increases the flow rate and heat transfer in the conduction pump, due to the improvement of the vortices formation in the vicinity of the electrodes. Moreover, it significantly increases the heat transfer in the pump by creating turbulent flow around the electrodes. On the other hand, higher operating temperatures enhance the flow rate and heat transfer due to decreasing density and viscosity and also increasing the temperature gradient between the source and the destination of heat transfer. The intense heat transfer enhancement by using the conduction phenomenon compared to the ordinary fluid flow pumping through a simple duct (having no electrodes) is seen for all film thicknesses and working temperatures. Maximum observed enhancement of Nusselt number for n-hexane and n-decane are equal to 1041% and 568%, respectively. | ||
| کلیدواژه‌ها [English] | ||
| Electrohydrodynamic, Electrical conduction pump, Ion mobility difference, Pump characteristics | ||
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| مراجع | ||
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