Abstract
A comprehensive experimental investigation is intended to survey consequence of nanofluid on performance of sundry parallel flow heat exchangers with the same heat transfer surface area. An experimental setup including one double-pipe heat exchanger, two shell-and-tube heat exchangers with different tube passes, and one plate heat exchanger is designed and built to carry out the experiments. The experiments are performed under turbulent flow conditions using distilled water and Al2O3/water nanofluid with 0.2, 0.5, and 1% particle volume concentrations. Based on the results from this study, the double-pipe heat exchanger reflected the best outcomes in the heat transfer coefficient with a maximum enhancement of 26%, while only a 7% increment in the heat transfer coefficient is observed for the plate heat exchanger. On the other hand, minimum punishment for pressure drop of the working fluids due to adding the nanoparticles is observed in the plate heat exchanger at 1% volume concentration with a maximum value of 10%.
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Abbreviations
- A :
-
Heat transfer surface area, m²
- b :
-
Corrugation depth, m
- B :
-
Plate width, m
- C p :
-
Specific heat capacity, J kg−1 K−1
- d bf :
-
Equivalent diameter of a molecule of the base fluid, m
- d p :
-
Average diameter of nanoparticles, nm
- D :
-
Diameter of tube, m
- D 1 :
-
Inside diameter of annulus, m
- D 2 :
-
Outside diameter of annulus, m
- f :
-
Friction coefficient
- F :
-
Correction factor
- h :
-
Convective heat transfer coefficient, W m−² K−1
- K :
-
Thermal conductivity, W m−1 K−1
- K B :
-
Boltzmann’s constant, J K−1
- L :
-
Length of tube, m
- m :
-
Mass flow rate, kg s−1
- M :
-
Molecular weight of the base fluid, kg kmol−1
- n :
-
Number of passes per stream
- N :
-
Avogadro number
- Nu :
-
Nusselt number
- Δp :
-
Pressure drop, kPa
- Pr :
-
Prandtl number
- Q :
-
Heat transfer rate, W
- Re :
-
Reynolds number
- Re p :
-
Nanoparticle Reynolds number
- t :
-
Plate thickness, m
- T :
-
Temperature, K
- T 0 :
-
Temperature at the inlet, K
- ∆T lm :
-
Logarithmic mean temperature difference, K
- u B :
-
Brownian velocity of the nanoparticle, m s−1
- U :
-
Overall heat transfer coefficient, W m−² K−1
- U S :
-
Superficial velocity inside the conduit, m s−1
- V :
-
Volume flow rate, m3 s−1
- β :
-
Chevron angle, (°)
- µ :
-
Dynamic viscosity, kg m−1 s−1
- ρ :
-
Density, kg m−³
- ρ f0 :
-
Mass density of the base fluid at temperature 293 K, kg m−³
- φ :
-
Nanoparticle volumetric fraction
- ave:
-
Average
- bf:
-
Base fluid
- c:
-
Cold
- ch:
-
Channel
- f:
-
Fluid
- fr:
-
Freezing
- h:
-
Hot
- H:
-
Hydraulic
- i:
-
Inside
- m:
-
Mean
- nf:
-
Nanofluid
- o:
-
Outside
- p:
-
Nanoparticle
- ss:
-
Stainless steel
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Acknowledgements
The authors thank the Jam Polypropylene Company, Islamic Azad University of Nour Branch and the Iran Nanotechnology Initiative Council (INIC) for their financial support for this study.
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Mansoury, D., Ilami Doshmanziari, F., Rezaie, S. et al. Effect of Al2O3/water nanofluid on performance of parallel flow heat exchangers. J Therm Anal Calorim 135, 625–643 (2019). https://doi.org/10.1007/s10973-018-7286-8
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DOI: https://doi.org/10.1007/s10973-018-7286-8