بررسی تجربی عملکرد حرارتی لوله گرمایی نوسانی در زاویه‌‌های نزدیک به افق

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه علوم مهندسی، دانشکده فنی و حرفه‌ای تبریز، دانشگاه فنی و حرفه‌ای،ایران.

2 معاون آموزشی دانشکده فنی و مهندسی دانشگاه ارومیه

3 استادیار، دانشکده علوم و مهندسی، دانشگاه آنگلیا روسکین، چلمزفورد، انگلستان

چکیده

لوله‌های حرارتی نوسانی با ساختاری ساده و مقرون به صرفه، می‌توانند حرارت قابل توجهی را انتقال دهند. در کابردهای صنعتی یکی از ضعف‌های عمده لوله‌های حرارتی نوسانی عملکرد نامطلوب آن‌ها در زوایای نزدیک افق می‌باشد. مطالعات پیشین عمدتاً تمرکز خود را در بررسی عملکرد آن‌ها در زوایای60،90 ،30 و صفر معطوف ساخته‌اند. بر اساس نتایج گزارش شده توسط این پژوهش‌ها، لوله‌های حرارتی نوسانی در محدوده زاویه صفر تا 30 درجه کارکرد ضعیفی از خود نشان می‌دهد. از سوی دیگر بررسی دقیقی در این محدوده جهت نمایان ساختن علل این پدیده، صورت نگرفته است. هدف اصلی این پژوهش بررسی تجربی عملکرد لوله‌ حرارتی نوسانی در زوایای انحراف نزدیک به افق و ارائه محدوده زاویه بحرانی می‌باشد. برای این منظور ابتدا بهترین درصد پرشدگی (60%) تعیین گردیده و به ازای این درصد، در زوایای مختلف صفر تا 90 درجه عملکرد لوله‌ حرارتی نوسانی مورد ارزیابی قرار گرفت. نتایج حاصل نشان داد که با کم کردن زاویه لوله‌ حرارتی نوسانی  از 90 درجه تا حدود زاویه 15 درجه ، اختلاف مقاومت حرارتی به ازای توان‌های حرارتی مختلف بسیار کم بوده ولی از زاویه 10 تا صفر درجه این اختلاف افزایش می‌یابد. همچنین بررسی‌های بیشتر نشان داد که اختلاف مقاومت حرارتی زوایای 15، 10و 5 با متوسط مقاومت حرارتی به ترتیب 3، 12 و 36 درصد است. نهایتاً مشخص گردید که ضعف اصلی لوله‌های حرارتی نوسانی از زاویه حدود 10 تا صفر درجه می‌باشد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Experimental Investigation of Thermal Performance of Pulsating Heat Pipe at Angles Close To the Horizon

نویسندگان [English]

  • Rostam Akbari kangarluei 1
  • Majid Abbasalizadeh 2
  • Ahad Ramezanpour 3
1 Department of Engineering Sciences, faculty of Tabriz, Technical and vocational University (TVU), Iran.
2 Vice-Dean of Education, Technical Faculty, Urmia University
3 School of Engineering and the Built Environment, Anglia Ruskin University (ARU), Bishop Hall Lane, Chelmsford, Essex, UK
چکیده [English]

Pulsating heat pipes can transfer a considerable amount of heat during their simple structure and low cost. In industrial applications, one of the significant weaknesses of pulsating heat pipes is their poor performance at angles close to the horizon. Previous studies have mostly been at 90, 60, 30, and 0-degree angles and have reported the weakness of pulsating heat pipes in the 30 to zero angle range, but detailed studies have not been performed in this range. Therefore, the primary purpose of this study is to experimentally investigate the performance of pulsating heat pipes at angles of deviation close to the horizon and provide a more accurate critical inclination angle. The performance of pulsating heat pipe was evaluated for the best filling percentage (60%) at different angles 0 to 90 degrees. The results showed that by reducing the pulsating heat pipe angle from 90 degrees to 15 degrees, the difference in thermal resistance for different heat input powers was very small, but this difference increased from an angle of 10 to 0 degrees. Further studies showed that the percentage of difference in thermal resistance between angles 15, 10, and 5 with the average value of thermal resistance is 3%, 12%, and 36%, respectively. Thus, it was found that the main weakness of pulsating heat pipes is from an angle of about 10 to 0 degrees.

کلیدواژه‌ها [English]

  • experimental
  • Thermal resistance
  • pulsating heat pipe
  • filling ratio
  • inclination angles
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