İÇERİSİNDE BÖLMELER BULUNAN ZİGZAG BİR KANALDA NANOAKIŞKANLARIN TERMO-HİDROLİK PERFORMANSININ İNCELENMESİ

Yıl 2021, , 525 - 534, 31.12.2021

Selma Akçay

https://doi.org/10.54365/adyumbd.1000525

Cited By: 3

Öz

Bu çalışmada, içerisinde bölmeler bulunan zigzag bir kanalda Al2O3-su nanoakışkanın termo-hidrolik performansı sayısal olarak incelenmiştir. Kütle, momentum ve enerji eşitlikleri sonlu hacim yöntemi ile ayrıklaştırıldı ve iterasyonlar SIMPLE algoritması ile çözülmüştür. Reynolds sayısı (200 ≤ Re ≤ 1600) ve partikül hacim oranı (0.01 ≤ φ ≤ 0.03) değiştirildi ve diğer parametreler sabit tutulmuştur. Zigzag kanalın alt ve üst yüzeyleri sabit sıcaklıkta tutulmuş ve kanal boyunca Nusselt sayısı ve sürtünme faktörü hesaplanmıştır. Parametrelerin, akış ve ısı transferi üzerindeki etkilerini gözlemlemek için kanal içerisinde hız ve sıcaklık görüntüleri elde edilmiştir. Sonuçlar, artan partikül hacim oranı ve Reynolds sayısı ile ısı transferinin iyileştiğini, sürtünme faktörünün hafif şekilde arttığını göstermiştir. En iyi termo-hidrolik performans Re=1400 ve φ = %3’de yaklaşık 1.15 olarak elde edilmiştir.

Anahtar Kelimeler

Nanoakışkan, Bölme, Zigzag kanal, Isı transferi, Termo-hidrolik performans

INVESTIGATION OF THERMO-HYDRAULIC PERFORMANCE OF NANOFLUIDS IN A ZIGZAG CHANNEL WITH BAFFLES

Öz

In this study, the thermo-hydraulic performance of Al2O3-water nanofluid in a zigzag channel with baffles were numerically investigated. The mass, momentum and energy equations are discretized with finite volume approach and iterations are solved with SIMPLE algorithm. Reynolds number (200 ≤ Re ≤ 1600), and nanoparticle volume fraction (0.01 ≤ φ ≤ 0.03) were changed, and other parameters kept constant. The lower and upper zigzag surfaces of the channel were kept at constant temperature, and the Nusselt number and friction factor along the channel were calculated. The velocity and temperature contours in the channel were obtained in order to observe the effects on flow and heat transfer of the paramerers. The results shown that the increasing particle volume fractions and Reynolds numbers improved the heat transfer, while the friction factor increased slightly. The best thermo-hydraulic performance was obtained at Re = 1400 and φ = 3% as approximately 1.15.

Anahtar Kelimeler

Nanofluid, Baffle, Zigzag channel, Heat transfer, Thermo-hydraulic performance

Kaynakça

• Lei YG, He YL, Li R, Gao YF. Effects of baffle inclination angle on flow and heat transfer of a heat exchanger with helical baffles. Chem. Eng. Process 2008; 47(12): 2336–2345.
• Keklikcioglu O, Ozceyhan V. Experimental investigation on heat transfer enhancement of a tube with coiled-wire inserts installed with a separation from the tube wall. International Communications in Heat and Mass Transfer 2016; 78. 88-94.
• Nanan K, Piriyarungrod N, Thianpong C, Wongcharee K, Eiamsa-ard S. Numerical and experimental investigations of heat transfer enhancement in circular tubes with transverse twisted-baffles. Heat Mass Transfer 2016; 52: 2177–2192.
• Li Z, Gao Y. Numerical study of turbulent flow and heat transfer in cross corrugated triangular ducts with delta-shaped baffles. Int. J. Heat Mass Transfer 2017; 108: 658–670.
• Sriromreun P. Numerical study on heat transfer enhancement in a rectangular duct with incline shaped baffles. Chem. Eng. Transfer 2017; 57: 1243–1248.
• Rashidi S, Eskandarian M, Mahian O, Poncet S. Combination of nanofluid and inserts for heat transfer enhancement, Gaps and challenges. Journal of Thermal Analysis and Calorimetry 2019; 135: 437–460.
• Alnak DE. Thermohydraulic performance study of different square baffle angles in crosscorrugated channel. Journal of Energy Storage 2020; 28: 101295.
• Chang SW, Cheng TH. Thermal performance of channel flow with detached and attached pin-fins of hybrid shapes under inlet flow pulsation. International Journal of Heat and Mass Transfer 2021; 164: 120554.
• Promvonge P, Tamna S, Pimsarn M, Thianpong C. Thermal characterization in a circular tube fitted with inclined horseshoe baffles. Appl. Therm. Eng. 2015; 75: 1147–1155.
• Kumar R, Kumar A, Chauhan R, Sethi M. Heat transfer enhancement in solar air channel with broken multiple V-type baffle. Case Stud. Therm. Eng. 2016; 8: 187–197.
• Sahel D, Ameur H, Benzeguir R, Kamla Y. Enhancement of heat transfer in a rectangular channel with perforated baffles. Appl. Therm. Eng. 2016; 101: 156–164.
• Dagdevir T, Keklikcioğlu O, Ozceyhan V. Heat transfer performance and flow characteristic in enhanced tube with the trapezoidal dimples. International Communications in Heat and Mass Transfer 2019; 108: 104299.
• Akdag U, Akcay S, Demiral D. Heat transfer enhancement with nanofluids under laminar pulsating flow in a trapezoidal-corrugated channel, Progress in Computational Fluid Dynamics, An International Journal 2017; 17(5): 302-312.
• Akdag U, Akcay S, Demiral D. Heat transfer enhancement with laminar pulsating nanofluid flow in a wavy channel. International Communications in Heat and Mass Transfer 2014; 59: 17–23.
• Akcay S, Akdag U. Parametric investigation of effect on heat transfer of pulsating flow of nanofluids in a tube using circular rings. Pamukkale University, Journal of Engineering Sciences 2018; 24(4): 597-604.
• Akdag U, Akcay S, Demiral D. Heat transfer in a triangular wavy channel with CuO-water nanofluids under pulsating flow. Thermal Science 2019; 23(1):191-205.
• Davletshin IA, Mikheev AN, Mikheev NI, Shakirov RR. Heat transfer and structure of pulsating flow behind a rib. Int.Jour.Heat and Mass Transfer 2020; 160: 120173.
• Chandrasekar M, Suresh S, Bose AC. Experimental studies on heat transfer and friction factor characteristics of Al2O3/water nanofluid in a circular pipe under laminar flow with wire coil inserts. Exp Therm Fluid Sci. 2010; 34(2): 122–130.
• Fazeli H, Madani S, Mashaei PR. Nanofluid forced convectionin entrance region of a baffled channel considering nanoparticle migration. Appl Therm. Eng. 2016; 106: 293–306.
• Karouei SHH, Ajarostaghi SSM, Gorji-Bandpy M, Fard SRH. Laminar heat transfer and fluid flow of two various hybrid nanofuids in a helical double-pipe heat exchanger equipped with an innovative curved conical turbulator. Journal of Thermal Analysis and Calorimetry 2021;143: 1455–1466.
• Manca O, Nardini S, Ricci D. A numerical study of nanofluid forced convection in ribbed channels. Applied Thermal Engineering 2012; 37: 280-297.
• Heshmati A, Mohammed HA, Darus AN. Mixed convection heat transfer of nanofluids over backward facing step having a slotted baffle. Applied Mathematics and Computation 2014; 240: 368–386.
• Ajeel RK, Sopian K, Zulkifli R. Thermal-hydraulic performance and design parameters in acurved- corrugated channel with L-shaped baffles and nanofluid. Journal of Energy Storage 2021; 34: 101996.
• Menni Y, Chamkha AJ, Ghazvini M, Ahmadi MH, Ameur H, Issakhov A, Inc M. Enhancement of the turbulent convective heat transfer in channels through the baffling technique and oil/multi walled carbon nanotube nanofluids. Numerical Heat Transfer, Part A: Applications 2021; 79(4): 311-351.
• Keklikcioğlu O, Ozceyhan V. Thermohydraulic performance evaluation for horizontal tube by using combination of modified coiled wire inserts and graphene nanoplatelet-water nanofluids. International Communications in Heat and Mass Transfer 2021; 123: 105206.
• Tian MW, Khorasani S, Moria H, Pourhedayat S, Dizaji HS. Profit and efficiency boost of triangular vortex-generators by novel techniques. Int. Journal of Heat and Mass Transfer 2020; 156: 119842.
• ANSYS. Fluent user guide & theory guide- (Release 15. 0) Fluent Ansys Inc., USA, 2015.
• Pak B, Cho YI. Hydrodynamic and heat transfer study of dispersed fluids with submicron metallic oxide particles. Experimental Heat Transfer 1998; 11(2): 151–170.
• Kakac S, Pramuanjaroenkij A. Review of convective heat transfer enhancement with nanofluids. Int. Jour. Heat and Mass Transfer 2009; 52: 3187–3196.
• Meyer JP, Abolarin SM. Heat transfer and pressure drop in the transitional flow regime for a smooth circular tube with twisted tape inserts and a square-edged inlet. Int. Jour. Heat and Mass Transfer 2018; 117: 11-29.