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.