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DÜŞEY DİKDÖRTGEN KESİTLİ BİR KANALDA FARKLI KANATÇIKLI YÜZEYLERDE ISI TRANSFERİNİN İNCELENMESİ

EXPERIMENTAL INVESTIGATION HEAT TRANSFER IN DIFFERENT WINGLET – SURFACES IN A VERTICAL RECTANGULAR DUCT

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Abstract (2. Language): 
This paper presents the experimental results free and forced convection in a rectangular cross sectional vertical channel. Experiments have performed by in three different shapes experiment element placed in to channel. The experiment belong to elements winglets have form flate plate, cylindrical and aligned at angle of θ = 60° positively and negatively with direction of main air flow in a rectangular straight duct. The experimental of studies result have showed change in between of Nusselt numbers which belong to in different shape placed winglet types into channel. Furthermore for each a type winglet model experiment results have been show comparison between winglet temperature and winglet length. It has been concluded that of heat transfer coefficient has improvement due to from renewal as periodic of the boundary layer with effect, which of this winglets have particularly placed in the event of groups periodically contracting and expanding in the winglets.
Abstract (Original Language): 
Dikdörtgen kesitli düşey bir kanalda doğal ve zorlanmış konveksiyonla ilgili yapılan deney sonuçları bu çalışmada sunulmuştur. Kanal içerisine üç farklı kanatçıklı deney elemanı yerleştirilerek deneyler yapılmıştır. Deney elemanlarına ait kanatçıklar, düzlem yüzey, silindirik ve hava akış yönüne θ = 60°’lik açı yapan daralan-genişleyen kanatçıklar şeklindedir. Deneysel çalışmaların sonucu, kanal içerisine farklı şekilde yerleştirilen kanatçık tiplerine ait Nusselt sayıları arasındaki değişim incelenmiştir. Ayrıca her bir tip kanatçık modeli için kanatçık sıcaklığı ve kanatçık boyu arasındaki deneysel sonuçlar gösterilmiştir. Gruplar halinde periyodik olarak yerleştirilen bu kanatçıkların özellikle daralan-genişleyen kanatçıklarda sınır tabakanın da periyodik olarak yenilenmesinden dolayı ısı transfer katsayısının iyileştiği sonucuna varılmıştır.

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