Düz bir yüzeye çarpan pulsatif jetin ısı transferi karakteristiğinin deneysel incelenmesi

Yıl 2023, Cilt: 38 Sayı: 2, 889 - 900, 07.10.2022

Ünal Akdağ Selma Akçay Mustafa Levent Karabayır

https://doi.org/10.17341/gazimmfd.1024995

Öz

Bu çalışmada, sabit ısı akısına sahip dairesel düz levhadan oluşan hedef yüzeyin pulsatif çarpan jet kullanılarak soğutulması deneysel olarak incelenmiştir. İncelemelerde, hedef yüzey ile jet çıkışı arasındaki mesafe (H/D), pulsatif jetin genliği (Ao) ve frekansı (Wo) değiştirilirken, jet Reynolds sayısı (Rej), Prandtl sayısı (Pr) ve geometrik parametreler sabit tutulmuş ve ısı transferi üzerinde bu parametrelerin etkileri analiz edilmiştir. Deneyler, üç değişik çarpma mesafesi, dört farklı genlik ve altı farklı frekans için yapılmıştır. Aktif ısı transferi iyileştirme yöntemi olarak kullanılan pulsatif jet için imal edilen deney düzeneği üzerinde ayrıntılı olarak sıcaklık ölçümleri yapılmış ve ölçülen sıcaklıklar yardımıyla Nusselt sayıları hesaplanmıştır. Elde edilen sonuçlar, boyutsuz sayılarla ifade edilmiş olup, sonuçlar sürekli jet çarpması sonucu oluşan ısı transferi sonuçlarıyla karşılaştırılmıştır. Deneysel sonuçlar, ısı transferi iyileştirmede pulsatif jetin önemli bir etkiye sahip olduğunu göstermiştir. Yapılan karşılaştırmalarda pulsatif jetin sürekli jete göre ısı transferini önemli ölçüde iyileştirdiği gözlenmiştir.

Anahtar Kelimeler

Pulsatif jet, ısıl performans iyileştirme, hedef yüzey, Nusselt sayısı

Destekleyen Kurum

Aksaray Üniversitesi

Proje Numarası

ASÜ-BAP 2015-029

Teşekkür

Bu çalışma, ASÜBAP tarafından 2015-029 nolu proje ile desteklenmiştir. Sağlanan desteğe teşekkür ederiz.

Kaynakça

• Jambunathan K., Lai E., Moss M.A., Button B.L., A review of heat transfer data for single circular jet impingement, Int J Heat Fluid Flow, 13, 106–115, 1992.
• Beitelmal A. H., Saad M. A., Patel C. D., The effect of inclination on the heat transfer between a flat surface and an impinging two-dimensional air jet, Int. J. Heat Fluid Flow, 21, 156-163, 2000.
• Chung Y. M., Luo K. H., Sandham N. D., Numerical study of momentum and heat transfer in unsteady impinging jets, Int. J. Heat Fluid Flow, 23 (5), 592-600, 2002.
• Zhou J.W., Wang Y.G., Geng L.P., Effect of surface roughness on unsteady impinging jet heat transfer characteristics, J.Engineering Thermophysics, 30 (4), 687–690, 2009.
• Celik N., Effects of the surface roughness on heat transfer of perpendicularly impinging co-axial jet, Heat and Mass Transfer, 47 (10) 1209-1217, 2011.
• Tesař V., Impinging Jets, Fluid Mechanics and Its Applications, 111, 191-231, 2015.
• Guo Q., Wen Z., Dou R., Experimental and numerical study on the transient heat-transfer characteristics of circular air-jet impingement on a flat plate, International Journal of Heat and Mass Transfer, 104, 1177-1188, 2017.
• Polat S., Huang B., Mujumdar A. S., Douglas W. J. M., Numerical flow and heat transfer under impinging jets: a review, Annual Review of Heat Transfer, 2, 2, 1989.
• Zuckerman N. Lior N., Jet impingement heat transfer: physics, correlations, and numerical modeling, Advances in Heat Transfer, 39, 565-631, 2006.
• Çalışır T., Çalışkan S., Kılıç M., Başkaya Ş., Numerical investigation of flow field on ribbed surfaces using impinging jets, Journal of the Faculty of Engineering and Architecture of Gazi University, 32 (1), 119-130, 2017.
• Kilic, M., Ozcan, O. A numerical investigation of combined effect of nanofluids and impinging jets for different parameter, Journal of the Faculty of Engineering and Architecture of Gazi University, 34(3), 1501-1515, 2019.
• Barewar S.D., Tawri S., Chougule S.S., Heat transfer characteristics of free nanofluid impinging jet on flat surface with different jet to plate distance: An experimental investigation, Chemical Engineering and Processing: Process Intensification 136, 1-10, 2019.
• Ozturk, M.S., Demircan, T., Numerical analysis of the effects of fin angle on flow and heat transfer characteristics for cooling an electronic component with impinging jet and cross-flow combination, Journal of the Faculty of Engineering and Architecture of Gazi University 37(1), 57-74, 2022.
• Hewakandamby B.N., A numerical study of heat transfer performance of oscillatory impinging jets, Int. J. Heat Mass Transfer, 52, 396–406, 2009.
• Mladin E.C., Zumbrunnen D.A., Alterations to coherent flow structures and heat transfer due to pulsations in an impinging air-jet, Int. J. Therm. Sci., 39, 236–248, 2000.
• Hofmann H.M., Kaiser R., Kind M. Martin H., Calculations of steady and pulsating impinging jets- An assessment of 13 widely used turbulence models, Numerical Heat Transfer, Part B, 51, 565-583, 2007.
• Akalanne L.C., MacGregor S.A., The effect of pulsating and streamwise flow on the heat transfer of an obstacle, Experimental Heat Transfer, 24, 1-14, 2011.
• Utturkar Y., Arik M., Charles E., Seeley C.E., Gursoy M., An experimental and computational heat transfer study of pulsating jets, Journal of Heat Transfer, 130, 062201, 2008.
• Hofmann H.M., Movileanu D.L., Kind M., Martin H., Influence of a pulsation on heat transfer and flow structure in submerged impinging jets, Int.Jour.Heat and Mass Transfer, 50, 3638-3648, 2007.
• Mladin E.C., Zumbrunnen D.A., Local convective heat transfer to submerged pulsating jets, International Journal of Heat and Mass Transfer, 40 (14), 3305-3321, 1997.
• Azevedo L.F.A., Webb B.W., Queiroz M., Pulsed air jet impingement heat transfer, Experimental Thermal Fluid Sci., 8, 206-213, 1994.
• Liewkongsataporn W., Patterson T., Ahrens F., Pulsating jet impingement heat transfer enhancement, Drying Technology, 26 (4) 433-442, 2008.
• Xu P., Yu B., Qiu S., Poh H.J., Mujumdar A.S., Turbulent impinging jet heat transfer enhancement due to intermittent pulsation, International Journal of Thermal Sciences, 49, 1247-1252, 2010b.
• Travnicek Z., Vit T., Impingement heat/mass transfer to hybrid synthetic jets and other reversible pulsating jets, International Journal of Heat and Mass Transfer, 85, 473–487, 2015.
• Alimohammadi S., Murray D.B., Persoons T., On the numerical- experimental analysis and scaling of convective heat transfer to pulsating impinging jets, International Journal of Thermal Sciences, 98, 296-311, 2015.
• Maghrabie H. M., Heat transfer intensification of jet impingement using exciting jets-A comprehensive review, Renewable and Sustainable Energy Reviews, 139, 110684, 2021.
• Tesař Vk., Trávníček Zk., Increasing heat and/or mass transfer rates in impinging jets, Journal of Visualization, 8, (2) 91-98, 2005.
• Poh H.J., Kumar K., Mujumdar A.S., Heat transfer from a pulsed laminar impinging jet, Int. Commun. Heat Mass Transfer, 32, 1317–1324, 2005.
• Xu P., Yu B., Qiu S., Poh H.J., Mujumdar A.S., Turbulent impinging jet heat transfer enhancement due to intermittent pulsation, Int. J. Thermal Sciences, 49, 1247-1252, 2010.
• Jafari M., Farhadi M., Sedighi K., Pulsating flow effects on convection heat transfer in a corrugate channel: A LBM approach, Int. Commun. Heat Mass Transfer, 45, 146-154, 2013.
• Esmailpour K., Hosseinalipour M., Bozorgmehr B., Mujumdar A. S., A numerical study of heat transfer in a turbulent pulsating impinging jet, The Canadian Journal of Chemical Engineering, 93(5), 959-969, 2015.
• Xu P., Mujumdar A.S., Poh H.J., Yu B., Heat transfer under a pulsed slot turbulent impinging jet a large temperature differences, Thermal Science, 14 (1), 271-281, 2010a.
• Rakhsha S., Zargarabadi M.R., Saedodin S., Experimental and numerical study of flow and heat transfer from a pulsed jet impinging on a pinned surface, Experimental Heat Transfer, 34 (4), 376-391, 2021.
• Holman J.P., Experimental Methods for Engineers, McGraw-Hill, New York, 2001.