Sınırlandırılmış Çarpan İkiz Jetlerin Akış Yapısı ve Isı Transferi Karakteristikleri Üzerine Bir İnceleme

Year 2023, Volume: 8 Issue: 2, 178 - 201, 28.12.2023

Yücel Özmen , Haluk Keleş

https://doi.org/10.33484/sinopfbd.1365843

Abstract

Sayısal ve deneysel yöntemler kullanılarak dairesel ikiz jetlerin ısı transferi performansı ve akış karakteristikleri üzerine bir araştırma gerçekleştirildi. Jetler alt yüzeyden yayılmış ve üst yüzeye dik olarak çarpmak üzere sınırlandırılmıştır. İki boyutlu çarpan ikiz jet akış alanındaki güçlü türbülans yapılarını ve ısı transferini simüle etmek için Realizable k-ε ve Standard k-ω türbülans modelleri kullanılmıştır. Hem simülasyonlarda hem de deneylerde 30000 ila 50000 arasında değişen Reynolds sayıları kullanılmış, jetler arası mesafe 0.5 ila 2 arasında değişmiş ve lüleler ile hedef çarpma levhası arası mesafe de aynı aralıkta olmuştur. Deneysel ölçümlerde açıklığın 1'e kadar olduğu durumlar için hedef çarpma yüzeyinde atmosfer altı basınç bölgeleri tespit edilirken, sayısal sonuçlar bunların incelenen tüm lüle hedef levha aralıklarında bulunabileceğini göstermiştir. Hedef yüzeydeki ısı transferi katsayılarındaki tepe noktaları ile basınç dağılımlarındaki atmosfer altı bölgeler arasında bir korelasyon keşfedilmiştir.

Keywords

İkiz çarpan jet, sub-atmosferik bölge, türbülans modelleri, basınç katsayısı, Nusselt dağılımı

An Investigation on Flow Structure and Heat Transfer Characteristics of Confined Impinging Twin Jets

Abstract

An investigation into the heat transfer performance and flow characteristics of circular twin jets was conducted using both numerical and experimental methods. The jets emanated from the lower surface and were confined to impinge perpendicularly on the upper surface. To simulate the bidimensional impinging twin jet flow field with powerful turbulence and heat transfer, Realizable k-ε and Standard k-ω turbulence models were employed. Reynolds numbers ranging from 30000 to 50000 were used in both simulations and experiments, with jet-to-jet spacing ranging from 0.5 to 2 and nozzles to target impingement plate spacing in the same range. Sub-atmospheric pressure regions were detected on the impingement surface in experimental measurements for spacing up to 1, whereas numerical results suggested that they could be found at all nozzle to target impingement plate spacings studied. A correlation was discovered between the peaks in coefficients of heat transfer on the target surface and the sub-atmospheric regions in pressure distributions.

Keywords

Twin impinging jet, sub-atmospheric region, turbulence models, pressure coefficient, Nusselt distribution

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