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Base Fluid

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Huseyi Kaya – One of the best experts on this subject based on the ideXlab platform.

  • experimental investigation of thermal performance of an evacuated u tube solar collector with zno etylene glycol pure water nanoFluids
    Renewable Energy, 2018
    Co-Authors: Huseyi Kaya, Kamil Arsla, Nuretti Eltugral

    Abstract:

    Abstract In this paper, the efficiency of an evacuated U-tube solar collector (EUSC) with ZnO/Etylene Glycol-Pure Water (ZnO/EG-PW) as a working Fluid was experimentally investigated. 50%–50% EG-PW was used as a Base Fluid. To prepare the nanoFluids ZnO nanoparticles were added to the EG-PW Base Fluid at different volume concentrations (1.0%, 2.0%, 3.0% and 4.0%). The maximum collector efficiency was obtained at equal working Fluid inlet temperature and ambient temperature in all experiments. Moreover, the highest collector efficiency was determined 62.87% for 3.0 vol.% and mass flow rate of 0.045 kg/s that it was 26.42% higher than EG-PW as a working Fluid. Also, this value is 5.2% and 6.88% higher than the Base Fluid for the mass flow rates of 0.03 and 0.02 kg/s, respectively. It was determined also that the thermal conductivity of ZnO/EG-PW nanoFluid increases with increasing nanoparticle volume concentration.

Nuretti Eltugral – One of the best experts on this subject based on the ideXlab platform.

  • experimental investigation of thermal performance of an evacuated u tube solar collector with zno etylene glycol pure water nanoFluids
    Renewable Energy, 2018
    Co-Authors: Huseyi Kaya, Kamil Arsla, Nuretti Eltugral

    Abstract:

    Abstract In this paper, the efficiency of an evacuated U-tube solar collector (EUSC) with ZnO/Etylene Glycol-Pure Water (ZnO/EG-PW) as a working Fluid was experimentally investigated. 50%–50% EG-PW was used as a Base Fluid. To prepare the nanoFluids ZnO nanoparticles were added to the EG-PW Base Fluid at different volume concentrations (1.0%, 2.0%, 3.0% and 4.0%). The maximum collector efficiency was obtained at equal working Fluid inlet temperature and ambient temperature in all experiments. Moreover, the highest collector efficiency was determined 62.87% for 3.0 vol.% and mass flow rate of 0.045 kg/s that it was 26.42% higher than EG-PW as a working Fluid. Also, this value is 5.2% and 6.88% higher than the Base Fluid for the mass flow rates of 0.03 and 0.02 kg/s, respectively. It was determined also that the thermal conductivity of ZnO/EG-PW nanoFluid increases with increasing nanoparticle volume concentration.

M. R. B. Johan – One of the best experts on this subject based on the ideXlab platform.

  • One-pot sonochemical synthesis route for the synthesis of ZnO@TiO_2/DW hybrid/composite nanoFluid for enhancement of heat transfer in a square heat exchanger
    Journal of Thermal Analysis and Calorimetry, 2020
    Co-Authors: Waqar Ahmed, S. N. Kazi, Z. Z. Chowdhury, M. R. B. Johan

    Abstract:

    The thermophysical properties of ZnO@TiO_2/DW composite nanoFluids with (0.1, 0.075, 0.05 and 0.025)mass% concentrations have been experimentally studied. The equal and homogenous dispersion of both ZnO and TiO_2 nanoparticles with 50:50 ratio each in distilled water (DW) was attained by the sonochemical method. The efforts are directed to examine the effective thermal conductivity of the different mass% concentrations of ZnO@TiO_2/DW composite nanoFluid for a selected range of temperatures at 20 to 45 °C. The maximum improvement in thermal conductivity for ZnO@TiO_2/DW composite nanoFluid was noticed for 0.1 mass% concentration, and the maximum enhancement was spotted 47% higher than the Base Fluid (DW). The heat transfer properties of ZnO@TiO_2/DW composite nanoFluids with (0.1, 0.075, 0.05 and 0.025) mass% concentrations and Base Fluid (DW) in a square heat exchanger were also investigated. Average and local heat transfer values and growth in Nusselt values were conquered for different velocities and corresponding to specific Reynolds numbers range from 4550 to 20,360. The maximum improvement increases about 57% in average heat transfer (h) and Nusselt numbers correspondingly, while local heat transfer for 0.1 mass% is about 500 to 1750 W m^−2 K, for 0.075 mass% is 500 to 1500 W m^−2 K, for 0.05 mass% is 500 to 1370 and for 0.025 mass% is 500 to 1150 of the composite nanoFluid which is greater than Base Fluid (DW). The ZnO and TiO_2 mixture gives the best combination to enhance the overall heat transfer coefficient (h). Graphic abstract

  • Experimental investigation of convective heat transfer growth on ZnO@TiO_2/DW binary composites/hybrid nanoFluids in a circular heat exchanger
    Journal of Thermal Analysis and Calorimetry, 2020
    Co-Authors: Waqar Ahmed, S. N. Kazi, Z. Z. Chowdhury, M. R. B. Johan, Naveed Akram, M. A. Mujtaba, M. Gul, C. S. Oon

    Abstract:

    The thermophysical properties of freely suspended ZnO and TiO_2 nanoparticles in a Base Fluid (DW) with different mass% concentrations of ZnO@TiO_2/DW binary composite nanoFluids (0.1, 0.075, 0.05 and 0.025 mass%) are deliberated. ZnO have been synthesized by using a facile single-pot sonochemical method and mixed with TiO_2 under high probe sonication to prepare binary composite nanoFluid. The experiment of effective thermal conductivity was executed in the temperature range of 20–45 °C. The positive improvement in thermal conductivity value for ZnO@TiO_2/DW binary composite nanoFluids was recorded for 0.1 mass%, and the highest improvement was measured up to 36%, greater than the Base Fluids (DW). The convective heat transfer properties of the ZnO@TiO_2/DW binary composite nanoFluids with different concentrations and Base Fluid (DW) were also examined by using complete experimental test rig with a circular heat exchanger Based on a constant heat flux boundary conditions. All the concentrations were examined to check the local and average improvement in heat transfer with Reynolds range from 5849 to 24,544. The increase in nanoparticles mass% in Base Fluid causes to raise the heat transfer coefficient ( h ) which is due to the composite nanoparticles. Finally, the maximum 600–1950 W m^−2 K^−1 enhancement was found in convective heat transfer with an increase in 0.1 mass% of composite nanoparticles, which is 69% greater than Base Fluid, while all other concentrations also shows positive enhancement as compared to Base Fluid (600–1870, 600–1700 and 600–1500) W m^−2 K^−1 correspondingly. Graphic abstract