Enhancing Heat Exchangers with Graphene as Al2O3 Nanofluid Coatings
DOI:
https://doi.org/10.32628/CSEIT2410231Keywords:
Hair Pin Heat Exchanger, Graphene, Nanofluid, Thermal Analysis, Convective Heat Transfer CoefficientAbstract
A well-designed heat exchanger improves the effectiveness of the heat exchanger. A hairpin heat exchanger resembles a hairpin when a shell-and-tube heat exchanger with a single-pass unit is folded in half, which can be used where space is a constraint. Design, CFD analysis and evaluation of various parameters of hairpin heat exchanger with graphene layer and its comparison with hairpin heat exchanger without graphene layer is the main aim of this paper. The heat exchanger is modified with the addition of a graphene layer on both the side (inner and outer side) of the tube of the heat exchanger. Graphene is an allotropic form of carbon having a single layer of atoms distributed in a 2-D honeycomb lattice. The coefficient of thermal conductivity of graphene is very high as compared to other materials. In addition to it, nanofluid Al2O3 is introduced as cold fluid. Nanofluids are colloidal suspensions made of nanoparticles in some base fluid. ANSYS FLUENT 2020 has been used to model the geometry and to perform numerical simulation. Turbulent flow conditions were used to analyse the heat exchanger. CFD analysis has been done on hairpin heat exchangers using graphene layer. The results indicate that the high thermal conductivity of graphene increases rate of heat transfer, and the numerical value of convective heat transfer coefficient is also high.
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M. Kumar, V. K. Yadav, B. Verma, K. K. Srivastava. Experimental Study of Friction Factor During Convective Heat Transfer in Miniature Double Tube Hair-pin Heat Exchanger. Procedia Technology 24, 669 (2016). https://doi.org/10.1016/j.protcy.2016.05.182 DOI: https://doi.org/10.1016/j.protcy.2016.05.182
Y. Xuan, Q. Li. Heat transfer enhancement of nanofluids. International Journal of Heat and Fluid Flow 21, 58 (2000). https://doi.org/10.1016/S0142- 727X(99)00067-3 DOI: https://doi.org/10.1016/S0142-727X(99)00067-3
J.A. Eastman: Anomalously increased effective thermal conductivity of ethylene glycol-based nanofluids containing copper nanoparticles. Applied Physics Letters 78, 718 (2001). https://doi.org/10.1063/1.1341218 DOI: https://doi.org/10.1063/1.1341218
H. Xie, J. Wang, T. Xi, Y. Liu. Thermal conductivity enhancement of suspensions containing nanosized alumina particles. Journal of Applied Physics 91, 4568 (2002). https://doi.org/10.1063/1.1454184 DOI: https://doi.org/10.1063/1.1454184
S. K. Das, N. Putra, P. Thiesen. Temperature dependence of thermal conductivity enhancement of nanofluids. Journal of Heat Transfer ASME 125, 567 (2003). https://doi.org/10.1115/1.1571080 DOI: https://doi.org/10.1115/1.1571080
S.El.B. Ma¨ gı a, C.T. Nguyen, N. Galanis. Heat transfer behaviors of nanofluids in a uniformly heated tube. Superlattices and Microstructures 35, 543 (2004). https://doi.org/10.1016/j.spmi.2003.09.012 DOI: https://doi.org/10.1016/j.spmi.2003.09.012
Y. Yang, G. Zhang, E.A. Grulke. Heat transfer properties of nanoparticle-in-fluid dispersions (nanofluids) in laminar flow. International Journal of Heat and Mass Transfer 48, 1107 (2005). https://doi.org/10.1016/j.ijheatmasstransfer.2004.09.0 38 DOI: https://doi.org/10.1016/j.ijheatmasstransfer.2004.09.038
W.Y Lai, B Duculescu, P.E. Phelan, R.S. Prasher. Convective heat transfer with nanofluids in a single 1.02-mm tube. Proceedings of ASME International Mechanical Engineering Congress and Exposition 3, 337 (2006). https://doi.org/10.1115/IMECE2006-14132 DOI: https://doi.org/10.1115/IMECE2006-14132
S. ZeinaliHeris, M. N. Esfahany. Experimental investigation of convective heat transfer of Al2O3/water nanofluid in circular tube. International Journal of Heat and Fluid Flow 28, 203 (2007). https://doi.org/10.1016/j.ijheatfluidflow.2006.05.001 DOI: https://doi.org/10.1016/j.ijheatfluidflow.2006.05.001
W. C. Williams, J. Buongiorno. Experimental investigation of turbulent convective heat transfer and pressure loss of alumina/water and zirconia/water nanoparticle colloids (nanofluids) in horizontal tubes. Journal of Heat Transfer ASME 130, (2008). https://doi.org/10.1115/1.2818775 DOI: https://doi.org/10.1115/1.2818775
K.V. Sharma, L. S. Sundar, P. K. Sarma. Estimation of heat transfer coefficient and friction factor in the transition flow with low volume concentration of Al2O3 nanofluid flowing in a circular tube and with twisted tape insert. International Communications in Heat and Mass Transfer 36, 503 (2009). https://doi.org/10.1016/j.icheatmasstransfer.2009.02.0 11 DOI: https://doi.org/10.1016/j.icheatmasstransfer.2009.02.011
D. P. Kulkarni, R. S. Vajjha, D. K. Das, D. Oliva. Application of aluminium oxide nanofluids in diesel electric generator as jacket water coolant. Applied Thermal Engineering 28, 1774 (2008). https://doi.org/10.1016/j.applthermaleng.2007.11.017 DOI: https://doi.org/10.1016/j.applthermaleng.2007.11.017
T. Teng, Y. H. Hung. Performance evaluation on an air- cooled heat exchanger for alumina nanofluid under laminar flow. Nanoscale Research Letters 6, (2011). https://doi.org/10.1186/1556-276X-6-488 DOI: https://doi.org/10.1186/1556-276X-6-488
P. Abhilash, U. Raghupati. Design and CFD analysis of hair pin heat exchanger using aluminium and titanium carbide nanofluids volume. Materials Today 39, 764 (2021). https://doi.org/10.1016/j.matpr.2020.09.451 DOI: https://doi.org/10.1016/j.matpr.2020.09.451
V. Subbaiah, B. Palampalle, K. Brahmaraju. Microstructural Analysis and Mechanical Properties of Pure Al– GNPs Composites by Stir Casting Method. Journal of The Institution of Engineers (India) Series C 100, 493 (2019). doi:10.1007/s40032-018-0491-1 DOI: https://doi.org/10.1007/s40032-018-0491-1
B. Singh, C. Singh. Unsteady Natural Convection in Condenser tank containing Al2O3–DI Water Nanofluids. Journal of The Institution of Engineers (India) Series C 101, 703 (2020). doi: 10.1007/s40032-020-00571-w DOI: https://doi.org/10.1007/s40032-020-00571-w
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