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AYNI ŞARTLAR ALTINDA BORU İÇİNDE FARKLI TİP BURGU ELEMANLARIN ISI TRANSFER İYİLEŞTİRMESİNİN İNCELENMESİ

INVESTIGATION OF HEAT TRANSFER AUGMENTATION IN A TUBE WITH DIFFERENT MODIFIED TWISTED TAPE INSERTS UNDER THE SAME CONDITIONS

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Abstract (2. Language): 
The swirl flow devices like twisted tape, winglet, groove, conical ring, wire coil etc. have been used as passive heat transfer augmentation technique. Especially, twisted tape devices have been applied in thermal engineering systems such as boilers, heat exchangers, water heater. Many researches using swirl flow devices particularly twisted tape with different geometries for heat transfer enhancement have been published. In this paper, different modified twisted tapes which had examined in previous studies were compared with each other with regard to heat transfer augmentation. Heat transfer, friction factor and thermal-hydraulic performance factor characteristics were investigated separately under the same conditions such as same twisted ratios and same Reynolds number values. Twisted tape which gives best heat transfer and friction factor results was determined. Derived empirical correlations which had been found by researchers were used for comparison between twisted tapes.
Abstract (Original Language): 
Burgu eleman, kanatçık, oluk, konik halka, tel sargı vb. gibi girdap akış cihazları pasif ısı transferi iyileştirme teknikleri olarak kullanılmaktadır. Özellikle, burgu elemanlar, kazan, ısı değiştiricisi, su ısıtıcı gibi ısıl mühendislik sistemlerinde uygulanmaktadır. Isı transferini iyileştirmek için farklı geometrilerdeki burgu elemanlar kullanılan birçok araştırma yayınlanmıştır. Bu çalışma kapsamında daha önce yapılan çalışmalarda kullanılan farklı tasarlanan burgu elemanlar, ısı transfer iyileştirmesi bakımından birbirleri ile karşılaştırılmıştır. Benzer burulma oranları ve benzer Reynolds sayıları gibi aynı koşullar altında ısı transferi, sürtünme faktörü ve ısıl hidrolik performans değerleri ayrı ayrı incelenmiştir. En iyi ısı transfer ve sürtünme faktörü değerlerini veren burgu eleman belirlenmiştir. Araştırmacılar tarafından bulunmuş türetilen denklemler burgu elemanların kıyaslanması için kullanılmıştır.

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References: 

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