IJE TRANSACTIONS A: Basics Vol. 27, No. 10 (October 2014) 1503-1510   

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Z. Cancan, L. Yafei, W. Li, X. Ke and W. Jinxing
( Received: January 18, 2014 – Accepted: June 26, 2014 )

Abstract    Heat exchangers are widely used in power engineering and industrial applications, many techniques such as coiled tube, surface tension devices, rough surfaces, extended surfaces have been investigated to enhancethermal performance and to minimize the cost and size of the heat exchanger equipment. One of the most important techniques is tube insert. In general,tube inserts can be classified into two broad categories: stationary inserts and self-rotating inserts.Compared with stationary inserts, the self-rotating inserts can rotate in the tube by fluid and the comprehensive performance of self-rotating inserts is improved significantly.This paper mainly focuses on reviewing the large number of experimental and numerical works taken by researchers on self-rotating inserts such as twisted tapes,miniature hydraulic turbine,turbine-type swirl generatorsetc.toimprove the thermal efficiency of heat exchanger and serviceable to designers implementing passiveenhancement techniques in heat exchange. The authors found that self-rotating inserts can strengthen the heat transfer efficiency meanwhile achieve on-line automatic anti-scaling and descaling effect. When the fluid velocity is more than 0.2m/s, most of self-rotating inserts can be applied meanwhile the convective heat transfer correlations have been discussed. The heat transfer performance and frictional loss have been discussed to get the optimal configuration of self-rotating inserts. Determining how to find the optimal self-rotating insert is the main objective of this paper..


Keywords    Tube Inserts, Self-rotating, Heat Transfer Enhancement, Anti-scaling and Descaling


چکیده    مبدل های حرارتی به طور گسترده­ای در تولید انرژی و کاربردهای صنعتی استفاده می­شود. فنون متعددی مانند لوله­های مارپیچ، تجهیزات تغییر کشش سطحی، خشن­سازی سطوح و سطوح گسترش­یافته به منظور افزایش عملکرد حرارتی و به حداقل رساندن هزینه و اندازه تجهیزات مبدل هاي حرارتی بررسی شده است. یکی از فنون مهم قرار دادن قطعه اضافی درون لوله است. به طور کلی، قطعه اضافی درون لوله را می­توان به دو گروه عمده طبقه بندی کرد:قطعه اضافی ثابت و قطعه اضافی خودگرد (خودچرخش). در مقایسه با قطعه اضافی ثابت، قطعه اضافی خودگرد می­تواند در لوله­های همراه مایع بچرخد. عملکرد قطعه اضافی خودگرد به طور قابل توجهی بهبود یافته است. در این مقاله به طور عمده تعداد زیادی از آثار تجربی و عددی انجام شده توسط محققان در قطعه اضافی خودگرد بررسی مانند نوار حلزونی، توربین هیدرولیک مینیاتور، ژنراتور چرخش توربین و غیره بررسی شده است. بهبود بهره­وری حرارتی مبدل های حرارتی و شرایط تعمیر مورد علاقه طراحان اجرای فنون تقویت غیرعامل در تبادل حرارت است. آنها دریافتند که قطعه اضافی خودگرد می تواند کارایی انتقال حرارت، در عین حال رسیدن به ویژگی پوسته پوسته نشدن و پاک کنندگی رسوب به صورت خودکار هنگامی که سرعت سیال بیشتر از sm / 0.2 باشد، بسیاری از قطعه اضافی خودگرد قابل استفاده­اند. در عین حال همرفتی انتقال حرارت نیز مطرح شده است. برای به دست آوردن تنظیمات بهینه از قطعه اضافی خودگرد عملکرد انتقال حرارت و افت اصطکاکی نیز مورد بحث قرار گرفته است. تعیین چگونگی پیدا کردن قطعه اضافی مطلوب خودگرد هدف اصلی این مقاله است.



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