کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7056614 | 1458053 | 2015 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Experimental investigation on the thermal performance of a micro pulsating heat pipe with a dual-diameter channel
ترجمه فارسی عنوان
بررسی تجربی بر روی عملکرد حرارتی یک لوله گرمای خفیف با کانال دو قطر
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کلمات کلیدی
کانال دو قطر لوله پالسی گرم فشار مویرگی، معیار شایستگی،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
چکیده انگلیسی
Experiments were performed to investigate the effect of a dual-diameter channel on the flow and heat transfer characteristics of flat plate micro pulsating heat pipes (MPHPs). Using MEMS techniques, the MPHPs were fabricated: rectangular channels with dual hydraulic diameters were engraved on a silicon wafer to form a meandering closed loop with 5 turns. The Pyrex glass was used as a cover which enables flow visualization in the MPHP. Experimental results show that the MPHPs with a dual-diameter channel can operate stably even in a horizontal position and have uniform thermal performance regardless of the orientation when a proper condition is met. It is postulated that the orientation-independent performance occurs when the capillary pressure generated by the difference in channel diameters is larger than the viscous pressure drop. This postulate was experimentally confirmed using Ethanol and FC-72 as working fluids at various input powers and inclination angles. To provide a guideline for orientation-independent operation of the MPHP with a dual-diameter channel a figure of merit is proposed: the figure of merit is defined as the ratio of capillary pressure difference to the viscous pressure drop, which is similar to the figure of merit for a conventional heat pipe. According to experimental data, the figure of merit has to be larger than 2Ã105 for orientation-independent operation of the MPHP.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 89, October 2015, Pages 817-828
Journal: International Journal of Heat and Mass Transfer - Volume 89, October 2015, Pages 817-828
نویسندگان
Gi Hwan Kwon, Sung Jin Kim,