An experimental study on heat transfer and pressure drop characteristics of decaying swirl flow through a circular pipe with a vortex generator

Saraç, Betül; Bali, Tülin

doi:10.1016/j.expthermflusci.2007.03.002

Cited by 86 publications

(19 citation statements)

References 22 publications

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“…Kurtbaş et al [31] studied the second law and thermal characteristics in the inner pipe of a co-axial heat exchanger fitted with propeller-type turbulators and found that the Nusselt number, the exergy loss rate and the efficiency are dependent on blade angle, inter-turbulator distance and propeller size. Saraç and Bali [32] investigated the heat transfer and pressure drop characteristics in a pipe fitted with propeller-type vortex generators at three different positions in the axial direction and reported that the increase in heat transfer is in the range of 18% to 163% above the plain tube.…”

Section: Introductionmentioning

confidence: 99%

Turbulent convection in round tube equipped with propeller type swirl generators

Eiamsa-ard

Rattanawong

Promvonge

2009

International Communications in Heat and Mass Transfer

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Section: Introductionmentioning

confidence: 99%

Turbulent convection in round tube equipped with propeller type swirl generators

Eiamsa-ard

Rattanawong

Promvonge

2009

International Communications in Heat and Mass Transfer

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“…Dönmeli akış üreticileri olarak da adlandırabileceğimiz türbülatörler; solar ısıtıcılar, reaktörler, ısı değiştiricileri, soğutma ve ısıtma gibi pek çok alanda kullanılmaktadır. Literatürde bu konu üzerine yapılmış pek çok araştırma mevcuttur [1][2][3][4][5][6][7][8][9][10].…”

Section: Introductionunclassified

Dairesel Kesitli Türbülans Üreticilerinin Etkinlik ve Ekserji Analizi

Turgut

2019

Fırat Üniversitesi Mühendislik Bilimleri Dergisi

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Öz: Bu çalışmada, yatay konumlu ve eş merkezli bir ısı değiştiricisinin iç borusuna yerleştirilen dairesel kesitli türbülatörlerin, ekserji kaybı ve etkinlik üzerine olan etkileri deneysel olarak incelenmiştir. Deneyler; türbülatörler arası mesafenin (a=5 cm, 10 cm ve 15 cm), delik çapının (ç=0.5 mm, 1 mm ve 1.5 mm), delik sayısının 1 ve 2 adet olması durumu için ve Reynolds sayısının 10000 ile 42000 arasında değiştirilmesiyle gerçekleştirilmiştir. Çalışma akışkanı olarak hava kullanılmıştır. Deneylerin yapılabilmesi için gereken buhar bir kazandan elde edilmiş ve ısı değiştiricisinin iki borusu arasındaki boşluğa gönderilerek iç borunun dış yüzeyinin buhar ile temas etmesi sağlanmış ve bu şekilde yüzeyde sabit sıcaklık şartı elde edilmiştir. Çalışma sonunda değişen durumlar için; entropi üretim oranı, ekserji ve etkinlik değerleri değerlendirilmiştir.Abstract: In this study, the effects of circular cross-section turbulators placed in the inner pipe of a concentric heat exchanger on exergy loss and efficiency were investigated experimentally. The parameters were choosen as the distance between the turbulators (a = 5 cm, 10 cm and 15 cm), the hole diameter (d = 0.5 mm, 1 mm and 1.5 mm), the number of holes and the Reynolds number (10000-42000). Air was used as working fluid. The steam required for carrying out the experiments was obtained from a boiler and sent to the space between the two pipes of the heat exchanger to allow the outer surface of the inner tube to come into contact with the steam, thereby achieving a constant temperature at the surface. At the end of the stud; entropy production rate, exergy and efficiency values were evaluated.

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“…In this case, there has been effective improvement of heat exchangers based on extensive research via experimental and numerical investigation on heat transfer performance and pressure drop characteristics of swirl flow applications . There has been more research based on generating swirl flow devices as found in the literature . Some series of studies have been performed by Eiamsa‐ard et al .…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation of thermal characteristics of a novel concentric type tube heat exchanger with turbulators

Şahi̇n

Baysal

Dal

2012

Int. J. Energy Res.

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SUMMARY In this study, the heat transfer performance and friction characteristics of a novel concentric tube heat exchanger with different pitches of helical turbulators were investigated experimentally and numerically for a Reynolds number range from 3000 to 14 000. An experimental system was established to obtain experimental data. The numerical simulations were performed by using a three dimensional numerical computation technique, a commercial CFD computer code. Then, the heat transfer performance and friction characteristics of several helical turbulators were compared. The experimental, numerical and empirical correlation results were in a good agreement with each others. As a result, the heat transfer enhancements using turbulators were 2.91, 2.41, 2.18 and 1.99 times better than the smooth tube for pitch distances of p = 20, 40, 60 and 80 mm, respectively. Copyright © 2012 John Wiley & Sons, Ltd.

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An experimental study on heat transfer and pressure drop characteristics of decaying swirl flow through a circular pipe with a vortex generator

Cited by 86 publications

References 22 publications

Turbulent convection in round tube equipped with propeller type swirl generators

Turbulent convection in round tube equipped with propeller type swirl generators

Dairesel Kesitli Türbülans Üreticilerinin Etkinlik ve Ekserji Analizi

Experimental and numerical investigation of thermal characteristics of a novel concentric type tube heat exchanger with turbulators

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