2 results listed
Abstract: This study presents numerical analysis of compact heat exchanger with hexagonal honeycomb metal foam fin. The fin has 10,8 mm pore size, %75,56 porosity, 1 mm thickness and 2,254 mm2/mm3 specific surface areas. CFD analyses were carried out by using constant surface temperature method. HAD analyses were carried out separately for air and water side. The heat transfer coefficients obtained from both sides are used in NTU equations to calculate the outlet temperatures. Analyzes were repeated for 4 different speeds. Analytical calculations were conducted to confirm CFD results. Validation of computational results carried out has shown good agreement.
Özet: Bu çalışmada altıgen bal peteği metal köpük kanatlara sahip ısı değiştirici teorik analizi yapılmıştır. Analizi yapılan kanat 10,8 mm hücre genişliği, %75,56 porosite, 1 mm et kalınlığı ve 2,254 mm2/mm3 özgül yüzey alanına sahiptir. HAD analizlerinde sabit yüzey sıcaklığı yöntemi uygulanmıştır. HAD analizleri hava ve su tarafı için ayrı ayrı yapılmıştır. Her iki taraf içinde elde edilen ısı transfer katsayıları NTU bağıntılarında kullanılarak çıkış sıcaklıkları hesaplanmıştır. Analizler 4 farklı hız için tekrarlanmıştır. HAD analizlerini doğrulamak için analitik hesaplar yapılmıştır. Yapılan hesaplar ve HAD analiz sonuçlarının uyumlu olduğu görülmüştür.
International Combustion Symposium
INCOS2018
Abdurrahim Temiz
Koray Ozdemir
M. Sait Cay
Levent Turhan
Mustafa Yasar
In this study, vacuum-gas infiltration setup was used to produce aluminium-B4C composite foam. The mentioned method involves addition of space holder materials and a dissolution technique to remove them after solidification of the metal. As space holder materials NaCl particles were selected and mixed with B4C powders to produce A360 (AlSi10Mg) aluminium-B4C composite foam. By changing the weight ratio of B4C particles, the alteration of the properties such as compression strength, density and porosity were investigated. Additionally, computer tomography views were obtained to see and interpret the section views of the alloy and composite foam. Compression tests were carried out to evaluate the mechanical behaviour of the foams under static loading. Results show that, the metal foam with % 0.5 B4C reinforcement has the greatest compression strength and the alloy foam has the lowest compression strength. The ceramic content especially %0,5, increased the compressive strength and the toughness of the foam.
International Conference of Advanced Materials and Manufacturing Technologies
ICAMT
Fuat Medik
Talha Sunar
Melik Çetin
Mustafa Yasar
Levent Turhan