Experimental Analysis of Nanofluid Circulation in Automobile Radiators: Thermal Efficiency and Flow Behaviour
J. Environ. Nanotechnol., Volume 14, No 3 (September 2025) pp. 19-28
Abstract
The heat transfer of coolant advancement through radiators significantly influences the optimization of fuel consumption in automobiles. In order to cool the circulating fluid, which is typically water or a water-based mixture, forced convection heat transfer is employed in automotive radiators. This study experimentally assessed the heat-transfer performance of an automobile radiator by evaluating the thermal performance of a specially prepared nanofluid. The nanofluid was created using a two-step process, involving demineralized water enhanced with graphene (GPN) nanoparticles at concentrations of 0.1 and 0.5 vol. %, along with the addition of GPN to cetyltrimethylammonium bromide (CTAB) surfactant in a 1:0.5 ratio for extended stability at the same concentrations. The experiments varied the liquid-side Reynolds number from 10,000 to 27,000, keeping the radiator inlet liquid at a constant temperature of 60–80 °C. This study thoroughly examined the impact of these variables on the overall heat-transfer coefficient. The experimental results show that the maximum increases in both thermal conductivity ratio and viscosity ratio were 32% and 144% without surfactant, and 33% and 165% with the addition of CTAB surfactant. The maximum average increases in the Nusselt number were 18.55% and 26.49% for the GPN/water nanofluid, and 49.05% and 57.56% for the GPN-CTAB/water nanofluid, respectively. The highest performance evaluation criteria relative to the Reynolds number using the GPN/water nanofluid at concentrations of 0.1 and 0.5 vol. % were recorded as 1.30 and 1.29, while for the GPN-CTAB/water nanofluid, the performance values were 1.14 and 1.10. Furthermore, the findings confirm that incorporating nanoparticles and surfactants into the base fluid results in superior performance compared to using water alone.
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Reference
Abderezzak, B. and Randi, S., Experimental investigation of waste heat recovery potential from car radiator with thermoelectric generator, Therm. Sci. Eng. Prog., 20100686 (2020).
https://doi.org/10.1016/j.tsep.2020.100686
Abdullatif, A. L., Shaik, F. and Syam, S. L., Thermal efficiency enhancement of mono and hybrid nanofluids in solar thermal applications – A review, Alex. Eng. J., 68365–404 (2023).
https://doi.org/10.1016/j.aej.2023.01.043
Ahmadi, M. H., Ghazvini, M., Maddah, H., Kahani, M., Pourfarhang, S., Pourfarhang, A. and Heris, S. Z., Prediction of the pressure drop for CuO/(Ethylene glycol-water) nanofluid flows in the car radiator by means of Artificial Neural Networks analysis integrated with genetic algorithm, Phys. Stat. Mech. Its Appl., 546, 124008 (2020).
https://doi.org/10.1016/j.physa.2019.124008
Akshay, J., Vinayak, K., Banapurmath, N. R., Prasanna, S. R., Ashok, M. S., Yunus, K. T. M., Ayachit, N. H., Irfan, A. B., Experimental and numerical investigation of heat transfer characteristics of radiator using Graphene Amine-based nano coolant, Case Stud. Therm. Eng., 63 105389, (2024).
https://doi.org/10.1016/j.csite.2024.105389
Arshad, W. and Ali, H. M., Experimental investigation of heat transfer and pressure drop in a straight minichannel heat sink using TiO2 nanofluid, Int. J. Heat Mass Transf., 110248–256 (2017).
https://doi.org/10.1016/j.ijheatmasstransfer.2017.03.032
Arunkumar, T., Anish, M., Jayaprabakar, J. and Beemkumar, N., Enhancing heat transfer rate in a car radiator by using Al2 O3 nanofluid as a coolant, Int. J. Ambient Energy, 40(4), 367–373 (2019).
https://doi.org/10.1080/01430750.2017.1392356
Bigdeli, M. B., Fasano, M., Cardellini, A., Chiavazzo, E. and Asinari, P., A review on the heat and mass transfer phenomena in nanofluid coolants with special focus on automotive applications, Renew. Sustain. Energy Rev., 601615–1633 (2016).
https://doi.org/10.1016/j.rser.2016.03.027
Chandrasekaran, M., Prakash, K.B., Subramaniyan, C., Santhosh, N. and Tamilarasan, V.D., Experimental investigation on heavy duty engine radiator using cerium oxide nano fluid, Mater. Today, Proc., 661497–1500 (2022).
https://doi.org/10.1016/j.matpr.2022.06.284
Ferrão, T. A. L. O., Henríquez, J .R., Da, C. J. Â. P. and Abramchuk, V., Comparative performance analysis of internal combustion engine water jacket coolant using a mix of Al2O3 and CuO-based nanofluid and ethylene glycol, Energy, 250123832 (2022).
https://doi.org/10.1016/j.energy.2022.123832
Fu, X., El-Rahman, M. A., Abdalla, A. N., Hasani, M. E. and Sharifpur, M., The numerical analysis and optimization of a Photovoltaic thermal collector with three different plain, ribbed, and porous-ribbed absorber tubes and a nanofluid coolant using two-phase model, J. Taiwan Inst. Chem. Eng., 148, 104725 (2023).
https://doi.org/10.1016/j.jtice.2023.104725
Gnielinski, V., Turbulent Pipe and Channel Flow, Int. Chem. Eng., 16(2), 359-368 (2013).
Hosain, M. L., Domínguez, J. M., Bel Fdhila, R. and Kyprianidis, K., Smoothed particle hydrodynamics modeling of industrial processes involving heat transfer, Appl. Energy, 252, 113441 (2019).
https://doi.org/10.1016/j.apenergy.2019.113441
Ijaz, H., Raza, H., Gohar, G. A., Ullah, S., Akhtar, A. and Imran, M., Effect of graphene oxide doped nano coolant on temperature drop across the tube length and effectiveness of car radiator – A CFD study, Therm. Sci. Eng. Prog., 20, 100689 (2020).
https://doi.org/10.1016/j.tsep.2020.100689
Jeong, C. J., Lee, G., In, I. and Park, S. Y., Concentration‐mediated multicolor fluorescence polymer carbon dots, Luminescence, 31(3), 897–904 (2016).
https://doi.org/10.1002/bio.3050
Kole, M. and Dey T. K., Role of interfacial layer and clustering on the effective thermal conductivity of CuO-gear oil nanofluids, Exp. Therm. Fluid Sci., 35(7), 1490–1495 (2011).
https://doi.org/10.1016/j.expthermflusci.2011.06.010
Kohne, T., Burkhardt, M., Theisinger, L. and Weigold, M., Technical and digital twin concept of an industrial heat transfer station for low exergy waste heat, Procedia CIRP, 104, 223–228 (2021).
https://doi.org/10.1016/j.procir.2021.11.038
Kumar, A., Chand, P. and Hassan, M.A., Louvered finned car radiator with MWCNT-SiO2 hybrid nanofluid: An experimental approach, Powder Technol., 415, 118176 (2023).
https://doi.org/10.1016/j.powtec.2022.118176
Kumar, A., Hassan, M. A. and Chand, P., Heat transport in nanofluid coolant car radiator with louvered fins, Powder Technol., 376, 631–642 (2020).
https://doi.org/10.1016/j.powtec.2020.08.047
Lawal, S. A., Medupin, R. O., Yoro, K. O., Okoro, U. G., Adedipe, O., Abutu, J., Tijani, J. O., Abdulkareem, A. S., Ukoba, K., Ndaliman, M. B., Sekoai, P. T. and Jen, T. C., Nanofluids and their application in carbon fibre reinforced plastics: A review of properties, preparation, and usage, Arab. J. Chem., 16(8), 104908 (2023).
https://doi.org/10.1016/j.arabjc.2023.104908
Li, D., Liu, C., Chen, S., Kong, W., Zhang, H., Wang, D., Li, Y., Chang, J. and Cheng, C., Simplified Compact Perovskite Solar Cells with Efficiency of 19.6% via Interface Engineering, Energy Environ. Mater., 3(1), 5–11 (2020).
https://doi.org/10.1002/eem2.12063
Miao, Z., Meng, X. and Liu, L., Improving the ability of thermoelectric generators to absorb industrial waste heat through three-dimensional structure optimization, Appl. Therm. Eng., 228, 120480 (2023).
https://doi.org/10.1016/j.applthermaleng.2023.120480
Nieh, H. M., Teng, T. P. and Yu, C. C., Enhanced heat dissipation of a radiator using oxide nano-coolant, Int. J. Therm. Sci., 77, 252–261 (2014).
https://doi.org/10.1016/j.ijthermalsci.2013.11.008
Pak, B. C. and Cho, Y. I., Hydrodynamic and heat transfer study of dispersed fluids with 445 submicron metallic oxide particles, Exp. Heat Transf., 11(2), 151–170 (1998).
https://doi.org/10.1080/08916159808946559
Ravi, T. S., Chellapilla, V. K. N. S. N. M., Jayakumar, S., Kiran, K. A. and Srinivas, V., Ethylene Glycol-Based Nanofluids – Estimation Of Stability And Thermophysical Properties, Front. Heat Mass Transf., 15, 1-9(2020).
https://doi.org/10.5098/hmt.15.7
Roy, A., Venkitaraj, K. P., Vigneshwaran, P., Saboor, S., Cuce, E. and Saxena, K. K., Enhanced convective heat transfer with Al2O3-water nanofluid in a PCM-based thermal energy storage system, J. Energy Storage, 97, 112853 (2024).
https://doi.org/10.1016/j.est.2024.112853
Ruey, O. H., Mohd, E. I. W., Yapp, J. M., Rahman, K. M. M., and Khairul, A. M. M., Effects of natural-based SiO2 nanocoolant on car radiator: Thermal profile, Mater. Today, Proc., 66, 2734–2737 (2022).
https://doi.org/10.1016/j.matpr.2022.06.505
Sundari, K. G., Asirvatham, L. G., Joseph, J. M. S., Manova, S., Sahu, M. and Jesse, A. M., Heat transfer studies using glycerin based nanocoolant for car radiator cooling applications, Mater. Today, Proc., 47, 7045–7049 (2021).
https://doi.org/10.1016/j.matpr.2021.06.104
Tam, L. M. and Ghajar, A. J., Transitional Heat Transfer in Plain Horizontal Tubes, Heat Transf. Eng., 27(5), 23–38 (2006).
https://doi.org/10.1080/01457630600559538
Zakaria, I. A., Mohamed, W. A. N. W., Azid, N. H. A., Suhaimi, M. A. and Azmi, W. H., Heat transfer and electrical discharge of hybrid nanofluid coolants in a fuel cell cooling channel application, Appl. Therm. Eng., 210, 118369 (2022).
