Farklı hızlarda ve ısı akılarında kanatlı yüzeylerde ısı transferinin deneysel olarak incelenmesi
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Dosyalar
Tarih
2008-08-01
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Selçuk Üniversitesi Fen Bilimleri Enstitüsü
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
Bu çalısmada bir silindir üzerine yerlestirilen kanatcık dizilerinde, zorlanmıs konveksiyon ile ısı transferi deneysel olarak incelendi. Deneysel çalısmada, bilgisayar sogutucusu olarak kullanılan kanatcıklı yüzeyler, 5 mm kalınlıkta silindirik formda Alüminyum üzerine yerlestirildi. Silindirik formdaki Alüminyum aynı kalınlıkta ve aynı formda bir Bakır üzerine sıkı geçirildi. iki farklı malzemenin kontak direnci hesaplamalarda ihmal edildi. Bakır malzemenin içinde 20 mm çapında, 25 mm boyunda bir bosluk olusturuldu. Bu bosluga gücü 15-70 watt arasında degisen bir ısıtıcı yerlestirildi. Kanatlarla birlikte olusturulan sistem, 90 mm çapında alüminyum bir boru içerisine yerlestirildi. Isıtıcıya sabit ısı akısı verilerek, 0.5-5 m/s aralıgında degisen hava hızları için, kanatcıklardan transfer edilen ısı ve kanat etkenlikleri hesaplandı. 15-70 watt degerleri arasında ve 2 m/s hava hızı için kanatcıklardan transfer edilen ısı maksimum degerdedir. 15 Watt degerinden küçük ısı akılarında ve 5 m/s'den büyük hava hızlarında, uygun degerler elde edilemedi.
In this study, heat transfer with forced convection in vane series which are placed on a cylinder was investigated experimentally. In this empirical study, fins used as computer coolers were placed on aluminum as a cylinder with 5 mm thickness. The aluminum in cylindrical form was covered firmly on copper with the same thickness and same form. The contact resistances of two different materials were neglected in calculations. A space which was 20 mm in diameter and 25 mm length was formed in the copper material. A heater, the power of which was changed between 15 and 70 watts, was placed in this space. The system formed with fins was put in an aluminum pipe which was 90 mm in diameter. The heat transferred from fins and the fin efficiencies were calculated for air speeds ranging between 0.5 and 5 m/s by giving constant heat flux to the heater. The heat transferred from vanes for 15-70 watts and 2 m/s air speed was found maximum. Proper values could not been obtained for heat fluxes less than 15 watts and air speeds higher than 5 m/s.
In this study, heat transfer with forced convection in vane series which are placed on a cylinder was investigated experimentally. In this empirical study, fins used as computer coolers were placed on aluminum as a cylinder with 5 mm thickness. The aluminum in cylindrical form was covered firmly on copper with the same thickness and same form. The contact resistances of two different materials were neglected in calculations. A space which was 20 mm in diameter and 25 mm length was formed in the copper material. A heater, the power of which was changed between 15 and 70 watts, was placed in this space. The system formed with fins was put in an aluminum pipe which was 90 mm in diameter. The heat transferred from fins and the fin efficiencies were calculated for air speeds ranging between 0.5 and 5 m/s by giving constant heat flux to the heater. The heat transferred from vanes for 15-70 watts and 2 m/s air speed was found maximum. Proper values could not been obtained for heat fluxes less than 15 watts and air speeds higher than 5 m/s.
Açıklama
Anahtar Kelimeler
Isı geçişi, Heat transfer, Makine mühendisliği, Mechanical engineering, Kanatcıklı yüzeyler, Electronic cooling, Surfaces with fins, Fin factors, Kanat etkenliği, Elektronik soğutma
Kaynak
WoS Q Değeri
Scopus Q Değeri
Cilt
Sayı
Künye
Şirin, S. (2008). Farklı hızlarda ve ısı akılarında kanatlı yüzeylerde ısı transferinin deneysel olarak incelenmesi. Selçuk Üniversitesi, Yayımlanmış yüksek lisans tezi, Konya.
