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    Effect of new design of elongated jet hole on thermal efficiency of solar air heater
    (Elsevier, 2022) Pazarlioglu, Hayati Kadir; Tepe, Ahmet Umit; Tekir, Mutlu; Arslan, Kamil
    Effect of new design of elongated jet hole on the thermal efficiency (eta th) of a solar air heater (SAH) has been numerically studied in this paper. Jet impingement technique, which is one of the important active techniques, has been implemented on the absorber plate of the SAH surface to increase the convective heat transfer per-formance. Several designs of elongated jet hole (EJH) technique (gradually increasing, gradually decreasing along the crossflow direction, and equally extended), which is highly effective application to get rid of cross-flow, has been inserted to the jet plate. The main interest of this paper is to investigate the effect of different EJH configurations on convective heat transfer performance and eta th of the SAH. 15 x 7 array of jets have been mounted on the confinement plate. Results have been compared with the conventional SAH, which has the jet impingement Case1. Numerical computations have been conducted using RNG k -epsilon turbulence model. Average Nusselt number (Nu) on the absorber plate surface, eta th of the SAH, and performance evaluation criteria (PEC) have been quantitatively investigated comprehensively. As a result of calculations, the Nu and eta th of SAH can be enhanced by 31.80 % and 2.46 %, respectively, using Case4 instead of Case1 at Re = 25000. Besides, the pressure drop of SAH dramatically rises by 10.26 %, when Case4 and Case1 compared with each other at Re = 25000. Despite increment in pressure drop, the PEC value achieves to 1.28. Finally, it is concluded that the equally extended EJH presents well performance compared to gradually increasing and decreasing EJH.
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    Öğe
    Uçagin Kanat Hücum Kenarinda Buzdan Arindirma Performansini Etkileyen Parameterelerin Optimizasyonu
    (Osman SAGDIÇ, 2022) Pazarlioglu, Hayati Kadir; Tepe, Ahmet Ümit; Arslan, Kamil
    Bu çalismada, uçus esnasinda tehlikeli durumlardan biri olan uçak kanat hücum kenari üzerinde buz birikimi sayisal olarak arastirilmistir. Hedef yüzey Tw=263.15 K derecede sabit tutulurken, giris sicakligi Tin=473.15 K olarak m ?=0.004 kg/s. ile sisteme iletilmistir. Arastirma NACA 0015 kullanarak sayisal çalismanin sabit piccolo tüp ölçüleri, jet açisi ve jetler ve jet-hedef yüzey mesafeleri için dogrulama çalismasi ile baslamistir. Ikinci ve üçüncü asamada farkli jet açilari (30°=?=150°) altinda X (4=H/d=8) ve Y (-1.25=L/d=1.25) yönünde degisen piccolo tüp pozisyonlarinin buzdan arindirma performansini incelemektir. Dördüncü asama buzdan arindirma sisteminin performansini maksimum tasinim isi transfer ve minimum basinç azalimi durumu ile arttirmak için optimum H/d, L/d ve ??oranlarini belirlemektir. Optimizasyon çalismasi Yüzey Cevap Metodolojisi kullanilarak yapilmistir. Sonuç olarak, teklif edilen tasarimda en yüksek buzdan arindirma performansi ????°? L/d=0.0 ve H/d=4.0 kullanilarak basarilirken, optimizasyon çalismalari maksimum isi transfer orani ve minimum basinç düsüsü degerini basarmak için ?? L/d ve H/d degerlerinin sirasiyla 55.45°, 0.0 ve 4.0 olmasi gerektigimi göstermistir.