Abstract
In the present study, the pure MCM-41- and CuO-doped MCM-41 nanoparticles with various mass fractions of CuO were synthesized and used for the preparation of water-based nanofluids. The obtained nanoparticles were characterized using small-angle X-ray scattering, scanning electron microscopy, transmission electron microscopy and N2 adsorption/desorption analysis. The thermal conductivity of the water-based nanofluids with various mass fractions of nanoparticles including 0.1, 0.5 and 1 mass% was measured by KD2-Pro thermal analyzer. A new correlation is developed for the thermal conductivity of the nanofluid with a reasonably good accuracy (± 5%) when comparing to the experimental data. The thermal performance of these nanofluids together with hydraulic features such as friction factor and heat transfer coefficient was investigated using a mini-channel heat exchanger. The obtained results revealed that the thermal conductivity can be enhanced by 13.1% which belonged to the nanofluid with 1 mass% of CuO-doped MCM-41 nanoparticles. The maximum heat transfer coefficient enhancement was 31% and belonged to the nanofluid containing 50% CuO@MCM-41 nanoparticles at 0.5 mass%. The performance evaluation criterion (PEC) of the various nanofluids was also calculated, and it was identified that the nanoparticles with 50% CuO@MCM-41 dispersed in water have the largest PEC, 16.7% over the base fluid. The friction factor increases by adding the nanoparticles to the pure water. For example, at Re = 1200, the friction factor increases about 36.84% by using the 50%CuO@MCM-41 nanoparticles with 0.5 mass% as compared with the pure water. The friction factor decreases with increasing the Reynolds number. For example, for 50%CuO@MCM-41 and 0.5 mass%, the friction factor decreases up to 34.17% as the Reynolds number increases in the range of 400–1200.
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- a :
-
Effective cross-sectional area of one adsorbate molecule, in square meters, 0.162 nm2 for nitrogen
- A t :
-
Total heat transfer area, m2
- C :
-
Dimensionless constant related to enthalpy of adsorption of adsorbate gas on powder sample
- C p :
-
Specific heat capacity, J kg−1 K−1
- D h :
-
Hydraulic diameter, m
- \( f \) :
-
Darcy friction factor
- H :
-
Heat transfer coefficient, W m−2 K−1
- H c :
-
Height of channel, m
- I :
-
Current, A
- K :
-
Thermal conductivity, W m−1 K−1
- L c :
-
Length of channel
- m :
-
Mass of test powder, g
- \( \dot{m} \) :
-
Mass flow rate, kg s−1
- N :
-
Avogadro constant, 6.022 × 1023 mol−1
- Nu:
-
Nusselt number
- ΔP :
-
Pressure drop, Pa
- P :
-
Partial vapor pressure of adsorbate gas in equilibrium with the surface at 77 K (b.p. of liquid nitrogen), Pa
- P 0 :
-
Saturated pressure of adsorbate gas, Pa
- PEC:
-
Performance evaluation criterion
- Q :
-
Heat, W
- Re:
-
Reynolds number
- T :
-
Temperature, K
- U :
-
Velocity, m s−1
- V :
-
Voltage, V
- V a :
-
Volume of gas adsorbed at standard temperature and pressure (273.15 K and 1.013 × 105 Pa), mL
- V m :
-
Volume of gas adsorbed at standard temperature and pressure to produce an apparent monolayer on sample surface, mL
- W c :
-
Width of channel, m
- avg:
-
Average
- B:
-
Balk
- Bf:
-
Base fluid
- F:
-
Fluid
- in:
-
Inlet
- nf:
-
Nanofluid
- out:
-
Outlet
- P:
-
Nanoparticle
- w:
-
Wall
- ρ :
-
Density, kg m−3
- µ :
-
Viscosity, kg m−1 s−1
- φ :
-
Volume fraction of particle
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The authors would appreciate Semnan University for the financial supports.
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Kiaee, F.M., Bahrami, Z. & Hormozi, F. Experimental investigation on the thermal performance and new correlation for thermal conductivity of aqueous copper oxide-doped MCM-41 nanofluids. J Therm Anal Calorim 140, 1443–1455 (2020). https://doi.org/10.1007/s10973-019-08832-2
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DOI: https://doi.org/10.1007/s10973-019-08832-2