Numerical and experimental analysis for comparison of square, cylindrical and plate fin arrays in external flow

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Tezin Türü: Yüksek Lisans

Tezin Yürütüldüğü Kurum: Orta Doğu Teknik Üniversitesi, Mühendislik Fakültesi, Makina Mühendisliği Bölümü, Türkiye

Tezin Onay Tarihi: 2018

Öğrenci: AYKUT BARIŞ İNCİ

Danışman: ÖZGÜR BAYER

Özet:

Geometrical optimization of square, cylindrical and plate fins for heat transfer augmentation is numerically performed in the external flow. Heat transfer performance of fins with different profiles are compared with same Reynolds number. The relation between the thermal characteristic of fins and boundary conditions like free-stream velocity and heat input are investigated. Experimental studies are performed using manufacturable fins to validate numerical model. Heat transfer correlations are derived in order to find average heat transfer coefficient of square, cylindrical and plate fins at a certain range of Reynolds number and non-dimensional geometric parameters like spanwise and streamwise spacings. Radiation included numerical analyses for fins having optimum configuration are conducted to increase the accuracy of numerical results. Uncertainty analysis is also performed to define the level of confidence for experimental work. Superiority of cylindrical fins to ones with square and plate profiles are observed in terms of heat transfer performance.