Improving the cooling performance of automobile radiator with Al2O3/water nanofluid
In this paper, forced convective heat transfer in a water based nanofluid has experimentally been compared to that of pure water in an automobile radiator. Five different concentrations of nanofluids in the range of 0.1–1 vol.% have been prepared by the addition of Al2O3 nanoparticles into the water. The test liquid flows through the radiator consisted of 34 vertical tubes with elliptical cross section and air makes a cross flow inside the tube bank with constant speed. Liquid flow rate has been changed in the range of 2–5 l/min to have the fully turbulent regime (9 × 103 < Re < 2.3 × 104). Additionally, the effect of fluid inlet temperature to the radiator on heat transfer coefficient has also been analyzed by varying the temperature in the range of 37–49 °C. Results demonstrate that increasing the fluid circulating rate can improve the heat transfer performance while the fluid inlet temperature to the radiator has trivial effects. Meanwhile, application of nanofluid with low concentrations can enhance heat transfer efficiency up to 45% in comparison with pure water.Highlights► Application of nanofluid in the car radiator has been studied experimentally. ► Heat transfer enhancement of about 45% compared to water has been recorded. ► Increasing particle concentration and velocity improves heat transfer performance.
Available from: Nor Azwadi Che Sidik
- "With 1.0 vol.% of nanoparticles, the maximum enhancements of heat transfer of the CNT–water nanofluids and Al 2 O 3 –water nanofluid were 90.76% and 52.03%, respectively higher compared to water only. Peyghambarzadeh et al.  Al 2 O 3 –water Maximum enhancement of thermal conductivity of nanofluids was 3.0% with 1.0 vol.% of Al 2 O 3 nanoparticles. However, with 1.0 vol.% of nanoparticles, maximum enhancement of heat transfer of the nanofluids was 45% when compared to water only. "
International Communications in Heat and Mass Transfer 11/2015; 68:85-90. · 2.78 Impact Factor
- "They reported an increase in the nanofluid heat transfer coefficient with the Reynolds number and nanoparticles concentration, particularly in the entrance region. Peyghambarzadeh et al.  obtained data with the objective of determining the convective heat transfer of Al 2 O 3 /water nanofluid flowing in an automobile radiator and observed heat transfer enhancement up to 45% as compared to pure water. Heris et al.  observed heat transfer enhancement of Al 2 O 3 /water nanofluid flowing in a tube under laminar flow conditions for constant wall temperature boundary condition. "
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ABSTRACT: Turbulent forced convection heat transfer and friction of Al2O3–water nanofluid flowing through a concentric tube U-bend heat exchanger with and without helical tape inserts in the inner tube were studied experimentally. The experiments were conducted in the Reynolds number range from 3000 to 30,000, volume concentrations of 0.01%, 0.03% and helical tape inserts of p/d = 5, 10, 15 and 20. The results indicate that an increase in Reynolds number and Prandtl number yields to an increase in the average Nusselt number, and augmentation of thermal conductivity in the nanofluid contributes to heat transfer enhancement. The Nusselt number of entire pipes for 0.03% concentrations of nanofluid with helical tape inserts of p/d = 5 shows an enhancement of 32.91%, as compared to water. The friction factor for the entire inner tube for 0.03% concentration of nanofluid with helical tape inserts of p/d = 5 has increased by 1.38-times, as compared to water; in general and consistent with theory, the pressure drop in the inner tube increases with an increase in nanoparticle volume concentration and aspect ratio of the inserts. The empirical correlations for the Nusselt number and friction factor are obtained as functions of the Reynolds number, Prandtl number, volume concentration and aspect ratio.
Experimental Thermal and Fluid Science 04/2015; 62. DOI:10.1016/j.expthermflusci.2014.12.006 · 1.99 Impact Factor
Available from: Abdul Jabbar N Khalifa
- "cooling block convective heat transfer coefficient. Peyghambarzadeh et al.  suggested that the application of nanofluid with low concentrations could enhance the heat transfer efficiency . In a contradicting conclusion, Williams et al.  observed no abnormal heat transfer enhancement with nanofluids over that of the water base fluid. "
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ABSTRACT: In this work, γ-Al2O3 nanoparticles with mean diameter of 10 nm is dispersed in de-ionized water with four nanoparticle volume concentrations of 0.25, 0.5, 0.75 and 1%. The effect of γ-Al2O3/water nanofluids on the heat transfer enhancement of heat exchangers is investigated under turbulent regime for four different volumetric flow rates of 150, 200, 250 and 300 L/h. The experimental results showed that the convective heat transfer is increased by increasing particles volume fraction as well as flow rate. A maximum enhancement obtained in Nusselt number and heat transfer coefficient were 20 and 22.8%, respectively at Reynolds number of 6026 and particles volume fraction of 1%. The experimental Nusselt numbers of nanofluids showed a good agreement with the available empirical correlation at particle volume fractions of 0.25 and 0.5%. An empirical correlation is obtained to estimate the Nusselt number of nanofluid under the conditions of the present work.
Link for full text: http://www.tandfonline.com/eprint/ikgSjFqcgYifPDuuiT4r/full
Heat Transfer Engineering 01/2015; 36(16). DOI:10.1080/01457632.2015.1003719 · 0.81 Impact Factor
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