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Numerical and experimental evaluation of thermal enhancement using zinc nano-suspensions in a square flow passage

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A Correction to this article was published on 23 January 2023

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Abstract

The heat transfer improvement using nanofluids inside varying shape heat exchangers is a still challenge to avoid from heat losses in chemical and petrochemical industries. In the stated study, the friction loss (f), pressure drop (∆P), average heat (have) transfer and average Nusselt (Nuave) numbers were evaluated numerically (ANSYS-FLUENT) and experimentally at varying 0.025 mass%, 0.05 mass%, 0.075 mass%, and 0.1 mass% concentrations of the low dimensional Zinc nanospheres-based nanofluids and base fluid (DW) in the square shaped heat exchanger. All the nanofluids and base fluid (DW) were assessed both experimentally and numerically for different thermophysical, hydrodynamic, and heat transfer characteristics. The addition of Zinc nanospheres in base fluid (DW) showed enhanced energy transportation at all mass% concentrations numerically and experimentally against Reynold numbers (Re) changing from 4550 to 20,367. Thermal conductivity, viscosity and density were measured at varying temperature ranges from 20 to 45 °C, where different changes were recorded in all properties against temperature values. Further, 2-D numerical model for single nanofluids was validated using laboratory scale distilled water (DW) as a base liquid. Further continuity, momentum, and energy equations were been evaluated by constructing a kɛ model and 2-dimensional domain. The maximum pressure drop (∆P/L) was recorded at 0.1 mass% which is 5152.72 m.Pas, while the friction loss (f) was 0.0188. Similarly, the average heat transfer (h) and Nusselt numbers (Nu) were calculated numerically and experimentally, where it has found the maximum heat transfer was 7095.25 Wm2 K−1 (61%) and the average Nusselt numbers (Nu) were 93.73 (57.3%) at the highest 0.1 mass%. Both numerical (ANSYS) and experimental results showed improved energy transportation at 0.1 mass% concentration against the highest Reynold number (Re) in comparison to base fluid (DW) and other mass%. The consequences confirmed the significance of the ANSYS model and experimental results with an average difference of ± 8.1%.

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Abbreviations

Z ns :

Zinc nanospheres

D h :

Pipe hydraulic diameter

N P :

Nanoparticles

BF:

Base fluid

DW:

Distill water

ff:

Friction factor/loss

Pr:

Prandtl numbers

L :

Medium total length (m)

Re:

Reynold numbers

L :

Medium total length (m)

W:

Walls of pipe

T:

Temperature (°C)

NF :

Nanofluids

Tw:

Pipe wall temperature

u:

Velocity

mass%:

Mass concentration

Dp:

Nanoparticle diameter (nm)

V:

Velocity (m s–1)

K:

Thermal conductivity

∆P:

Pressure drop

Cp:

Specific heat kJ kg −1 K–1

T b :

Temperature in bulk (K)

Nuave :

Average Nusselt (Nu) Numbers

Q″:

Total heat flux (W m–2)

Re:

Reynold numbers

ρ :

Density (kg m–3)

µ :

Fluid Viscosities in (N m s–1)

Φ:

Volumetric friction of fluids

V :

Kinematic viscosity (m2s–1)2

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Acknowledgements

The author would appreciate the grant R.K130000.7343, the international grant and Takasago Thermal System for all kinds of support. Also, I would like to acknowledge UTM OCEAN Thermal Energy Center (OTCE) and Takasago i-Kohza, Malaysia-Japan International Institute of Technology, Universiti Teknologi Malaysia, Kuala Lumpur, for providing me opportunity to lead my research in positive direction. The author also would like to appreciate Dr. Hussein Togun and Balaji Bakthavatchalam for their help to improve the manuscript language.

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Correspondence to Waqar Ahmed or Nor Azwadi Che Sidik.

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The original online version of this article was revised: The third author’s affiliation was tagged incorrectly as 3 instead of 1. The affiliations 4 to 8 were mentioned incorrectly. The corrected affiliations were given below.

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Ahmed, W., Alawi, O.A., Abdelrazek, A.H. et al. Numerical and experimental evaluation of thermal enhancement using zinc nano-suspensions in a square flow passage. J Therm Anal Calorim 148, 551–570 (2023). https://doi.org/10.1007/s10973-022-11734-5

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