ENERGY, ENTROPY AND EXERGY ANALYSES OF HYBRID NANOFLUID FLOW IN A TRAPEZOIDAL CHANNEL

Year 2021, , 106 - 116, 29.06.2021

Mutlu Tekir , Mutlucan Bayat Kamil Arslan

https://doi.org/10.22531/muglajsci.901966

Cited By: 2

Abstract

This study presents energy, entropy, and exergy analyses of Al2O3-Cu/water hybrid nanofluid flow in a trapezoidal cross-sectioned channel under a turbulent regime (10⁴<Re<10⁵) for the first time. Understanding the main source of the entropy generation along the channel, also obtaining the total entropy variation of hybrid nanofluid comparing to single nanofluids (Al2O3/water and Cu/water) and base fluid is pursued objective. In other to perform these aforementioned analyses, a realistic model, in which all formulas are derived, is developed and thermodynamic concepts such as exergy efficiency and exergy destruction for hybrid nanofluid flow in a non-circular cross-sectioned channel are discussed for the first time. Results obtaining from the analyses of both hybrid and single nanofluids have been compared and discussed for volumetric concentrations of 1.0% and 2.0%. As a result, it is obtained that 2.0% volume concentration hybrid nanofluid offers the best convective heat transfer performance with 34% enhancement and best exergetic performance. Furthermore, hybrid nanofluid has the lowest entropy generation value.

Keywords

Hybrid Nanofluid, CFD, Turbulent Flow, Convective Heat Transfer, Energy, Entropy, Exergy Analyses

References

• Takabi, B. and Shokouhmand, H., “Effects of Al2O3-Cu/water hybrid nanofluid on heat transfer and flow characteristics in turbulent regime,” Int. J. Mod. Phys. C, vol. 26, no. 4, p. 1550047, 2015.
• Selvakumar, P. and Suresh, S., “Use of Al2O3-Cu/water Hybrid Nanofluid in an Electronic Heat Sink,” IEEE Trans. Components, Packag. Manuf. Tech., vol. 2, no. 10, pp. 1600–1607, 2012.
• Suresh, S., Venkitaraj, K. P., Selvakumar, P., and Chandrasekar, M., "Effect of Al2O3-Cu/water hybrid nanofluid in heat transfer", Experimental Thermal And Fluid Science, 38: 54–60 (2012).
• Suresh, S., Venkitaraj, K. P., Selvakumar, P., and Chandrasekar, M., "Synthesis of Al2O3-Cu/water hybrid nanofluids using two step method and its thermo physical properties", Colloids And Surfaces A: Physicochemical And Engineering Aspects, 388 (1–3): 41–48 (2011).
• Moghadassi, A., Ghomi, E., and Parvizian, F., "A numerical study of water based Al2O3 and Al2O3-Cu hybrid nanofluid effect on forced convective heat transfer", International Journal Of Thermal Sciences, 92: 50–57 (2015).
• Ahammed, N., Asirvatham, L. G., and Wongwises, S., "Entropy generation analysis of graphene–alumina hybrid nanofluid in multiport minichannel heat exchanger coupled with thermoelectric cooler", International Journal Of Heat And Mass Transfer, 103: 1084–1097 (2016).
• Moghaddami, M., Mohammadzade, A., and Esfehani, S. A. V., "Second law analysis of nanofluid flow", Energy Conversion And Management, 52 (2): 1397–1405 (2011).
• Singh, P. K., Ahmed, N. Z., Das, S. K. and Shatilla, Y., “Exergy Analysis of Nanofluids In Microchannel”, 9th International Conference on Nanochannels, Microchannels, and Minichannels (ICNMM2011), Alberta, Canada, pp. 1–9, June 19-22, 2011.
• Bianco, V., Nardini, S. and Manca, O., “Enhancement of heat transfer and entropy generation analysis of nanofluids turbulent convection flow in square section tubes,” Nanoscale Research Letters, vol. 6, no. 252, pp. 1–12, 2011.
• Ji, Y., Zhang, H., Yang, X. and Shi, L., “Entropy Generation Analysis and Performance Evaluation of Turbulent Forced Convective Heat Transfer to Nanofluids,” Entropy, vol. 19, no. 108, pp. 1–18, 2017.
• Amirahmadi, S., Rashidi, S., and Abolfazli Esfahani, J., "Minimization of exergy losses in a trapezoidal duct with turbulator, roughness and beveled corners", Applied Thermal Engineering, 107: 533–543 (2016).
• London, W. M. K. and A. L., "Compact Heat Exchangers", McGraw-Hill, New York, USA, (1964).
• Dhariwal, S. M. F. and R. S., "Experimental and Numerical Investigation Into the Flow Characteristics of Channels Etched in silicon", Journal Of Fluids Engineering, 120: 291–295 (1998).
• Lee, S. W., "Heat Transfer Characteristics of a Two-Pass Trapezoidal Channel and a Novel Heat Pipe", Texas A&M University, (2007).
• Minea, A. A., “Challenges in hybrid nanofluids behavior in turbulent flow: Recent research and numerical comparison,” Renewable and Sustainable Energy Reviews, vol. 71, pp. 426-434, 2017.
• "Fluent Theory Guide", Ansys Inc.
• B. E. Lauder and D. B. Spalding, "Lectures in Mathematical Models of Turbulence", Academic Press, London, UK, (1972).
• Namburu, P. K., Das, D. K., Tanguturi, K. M., and Vajjha, R. S., "Numerical study of turbulent flow and heat transfer characteristics of nanofluids considering variable properties", International Journal Of Thermal Sciences, 48 (2): 290–302 (2009).
• Maxwell, J. C., "A Treastise on Electricity and Magnetism", 2nd ed. Ed., Oxford Univ. Press, Cambridge, USA, 440 (1881).
• Einstein, A., "Eineneuebestimmung der molekuldimensionen", Annals Of Physics, 324 (2): 289–306 (1906).
• Brinkman, H. C., "The viscosity of concentrated suspensions and solutions", The Journal Of Chemical Physics, 20 (4): 571 (1952).
• Batchelor, G. K., "The effect of Brownian motion on the bulk stress in a suspension of spherical particles", Journal Of Fluid Mechanics, 83 (1): 97–117 (1977).
• Lide, D. R. and Frederikse, H. P. R., "CRC Handbook of Chemistry and Physics 1997-1998", Chemical Rubber Company, 78: (1997).
• Yang, C., Wu, X., Zheng, Y., and Qiu, T., "Heat transfer performance assessment of hybrid nanofluids in a parallel channel under identical pumping power", Chemical Engineering Science, 168: 67–77 (2017).
• A. Bejan, "Entropy Generation Minimization", CRC Press, Boca Raton, NY, (1996).
• Cengel, Y. and Boles, M., "Thermodynamics: An Engineering Approach", 8th Edition. Ed., McGraw-Hill Education, (2014).