Nanoakişkanlarda Kararliliğin Isi Transferi̇ni̇ İyi̇leşti̇rme Açisindan Önemi̇

Şahin, Fevzi; Namli, Lutfu

doi:10.28948/ngumuh.445339

Cited by 3 publications

(1 citation statement)

References 91 publications

(119 reference statements)

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“…Geleneksel akışkanların içerisinde süspansiyon olarak yer tutan nano sıvılar, gelişmiş termal iletkenliklerinden dolayı geleneksel akışkanlara kıyasla üstün ısı transferi potansiyeline sahiptirler (Şahin & Namlı, 2018).…”

Section: Introductionunclassified

Farklı Nanoakışkanlar Kullanılan Isı Borularında Termal Verimi Etkileyen Parametrelerin Taguchi Yöntemi ile Optimizasyonu

Öztürk

SÖNMEZ

KABAKUŞ

2023

Yüzüncü Yıl Üniversitesi Fen Bilimleri Enstitüsü Dergisi

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Bu çalışmada ısı değiştiricilerinde farklı tip nanoakışkanlar kullanılarak ısı borularının termal verimini etkileyen parametreler Taguchi yöntemi ile optimize edilmiştir. Deney tasarımı termal verimi etkileyen dört parametre için üç seviyede L27(3^4) ortogonal serisine göre gerçekleştirilmiştir. Deneyler %0.2-0.4-0.6 derişimlerde, Alüminyum Oksit (Al2O3), Titanyum dioksit (TiO2) ve Silisyum dioksit (SiO2) için yapılmıştır. Nanoakışkan süspansiyonlarında temel sıvısı olarak izopropil alkol kullanılmıştır. Evaporatör bölgesindeki giriş sıcaklıkları 40-60-80°C, kondenser bölgesindeki hava hızları 0.4-0.8-1.2m/s olarak belirlenmiştir. Taguchi yöntemi ile oluşturulan deney tasarımına uygun şekilde yapılan deneyler sonucunda ısı borularının termal verimleri hesaplamıştır. Varyans analizi (ANOVA) ile modelin doğruluğu test edilmiş ve optimum parametreler; nanopartikül SiO2, derişim 0.4, evaporatör giriş sıcaklığı 80°C ve kondenserdeki hava hızı 1.2m/s olarak elde edilmiştir.

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Section: Introductionunclassified

Farklı Nanoakışkanlar Kullanılan Isı Borularında Termal Verimi Etkileyen Parametrelerin Taguchi Yöntemi ile Optimizasyonu

Öztürk

SÖNMEZ

KABAKUŞ

2023

Yüzüncü Yıl Üniversitesi Fen Bilimleri Enstitüsü Dergisi

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Single-phase flow heat transfer characteristics in helically coiled tube heat exchangers

et al. 2022

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The aim of this review is to present a summary of the published papers of the heat transfer and pressure drop characteristics for single-phase flow in helically coiled tubes. The effect of geometrical parameters such as curvature ratio, coil pitch and working conditions such as Reynolds number, Dean number, flow rate and flow arrangement on heat transfer and pressure drop in helically coiled tubes are determined in the light of the experimental, numerical and analytical studies in the literature. Also, the effect of using nanofluids in comparison with conventional fluids, using enhanced surfaces such as corrugated, micro-finned, dimpled with regards to smooth surfaces and wire coil insert usage in helically coiled tubes are discussed. The correlations proposed for determination of Nusselt number and friction factor in helically coiled tubes are presented in detail separately under laminar and turbulent flow regimes. The studies show that usage of helically coiled tube merely gives higher heat transfer rate and pressure drop in comparison to straight one, additionally, the heat transfer performance increases with the inclusion of the combination of other passive heat transfer enhancement methods to helically coiled tube. Moreover, the subject of single-phase flow in helically coiled tubes is ascertained to be worth researching due to the fact that there are limited number of studies and is still no empirical or analytical model/correlation in the case of using enhanced surfaces and wire coil insert. Forthcoming researches on this issue in the near future will be considered as pioneer ones in literature.

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Advances in triple tube heat exchangers regarding heat transfer characteristics of single and two-phase flows in comparison to double tube heat exchangers part 1

Akgul,

Mercan,

Acikgoz

et al. 2023

Kerntechnik

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Triple concentric-tube heat exchangers are used widely in refrigeration, drying, energy storage, chemical systems, and the food industry. To handle excessive temperature differences, the heat transfer area, as an option, the heat exchanger’s length, is necessary to be increased. Triple tubes have a significant advantage in this regard in comparison to double ones. The target of this review is to discuss the most recent publications, including the single-phase flows in these heat exchangers, focusing on the heat transfer and hydrodynamic characteristics, and to classify them with various contemporary aspects. The operating conditions, enhanced surfaces, and sizes, as well as the geometrical parameters, are categorized as being part of experimental, numerical, and analytical research. The studies indicate that the heat transfer characteristics of triple concentric-tube heat exchangers are better than those of double tube heat exchangers. In single-phase studies, the convective and overall heat transfer coefficients, Nusselt number, heat transfer rate, and effectiveness are greater in triple heat exchangers than in double heat exchangers, and the heat exchanger length required to achieve the same heat transfer performance is shorter in triple heat exchangers than in double heat exchangers. Heat transfer surface area increases by adding a concentric third tube. Advanced surfaces enhance heat transfer compared to smooth surfaces and flow turbulence in comparison to smooth surfaces. Heat transfer from triple-one enhanced surfaces is not well-analyzed. Design and use of triple ones as a double one’s alternative should advance shortly.

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Nanoakişkanlarda Kararliliğin Isi Transferi̇ni̇ İyi̇leşti̇rme Açisindan Önemi̇

Cited by 3 publications

References 91 publications

Farklı Nanoakışkanlar Kullanılan Isı Borularında Termal Verimi Etkileyen Parametrelerin Taguchi Yöntemi ile Optimizasyonu

Farklı Nanoakışkanlar Kullanılan Isı Borularında Termal Verimi Etkileyen Parametrelerin Taguchi Yöntemi ile Optimizasyonu

Single-phase flow heat transfer characteristics in helically coiled tube heat exchangers

Advances in triple tube heat exchangers regarding heat transfer characteristics of single and two-phase flows in comparison to double tube heat exchangers part 1

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