Nanofluid Thermal Properties and Heat Transfer Enhancement Techniques

Nanofluids are engineered suspensions of nanoparticles in conventional base fluids that exhibit markedly improved thermal conductivity, tailored viscosity and modified rheological behaviour compared with pure liquids. Enhancement of heat transfer arises from mechanisms such as Brownian motion, particle aggregation dynamics and interfacial thermal resistance at the solid–liquid boundary. By varying particle material, shape, size and volume fraction, and by employing surface functionalisation or dispersants, researchers can tune thermophysical properties to suit specific applications. Techniques for further augmentation include hybrid nanoparticle combinations, magnetohydrodynamic actuation, electric-field-induced alignment and integration with microstructured surfaces or vortex generators. These advances have enabled more compact heat exchangers, more efficient solar thermal collectors, improved electronics cooling and lower-temperature operation in automotive and industrial systems. Key challenges remain in achieving long-term stability without excessive viscosity penalties, in standardising measurement methods and in developing predictive models that reconcile multi-scale phenomena. Progress in scalable fabrication, reliable stability assessment and coupled thermal-fluid simulations is essential to bridge the gap between laboratory demonstrations and commercial deployment of next-generation heat transfer fluids.

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Nanofluid Thermal Properties and Heat Transfer Enhancement Techniques publication trend

The graph below shows the total number of articles in nanofluid thermal properties and heat transfer enhancement techniques across all publications each year (not limited to Nature Index journals).

Technical terms

Nanofluid: A colloidal suspension of nanoparticles within a base fluid, designed to improve thermal transport.

Thermal conductivity: The capacity of a material to conduct heat, typically expressed in W m⁻¹ K⁻¹.

Viscosity: A measure of a fluid’s resistance to flow or deformation under applied shear stress.

Nusselt number: A dimensionless ratio representing convective to conductive heat transfer at a boundary.

Brownian motion: The random movement of particles in a fluid, contributing to enhanced thermal dispersion.

References

1. Experimental and theoretical studies of nanofluid thermal conductivity enhancement: a review. Discover Nano (2011).
2. Rheological behaviour of nanofluids. New Journal of Physics (2007).
3. Magneto-hydrodynamic flow and heat transfer of a hybrid nanofluid in a rotating system among two surfaces in the presence of thermal radiation and Joule heating. AIP Advances (2019).
4. A brief review on viscosity of nanofluids. International Nano Letters (2014).
5. A Review on Nanofluids: Fabrication, Stability, and Thermophysical Properties. Journal of Nanomaterials (2018).
6. An updated review of nanofluids in various heat transfer devices. Journal of Thermal Analysis and Calorimetry (2020).
7. Evaluating the unsteady Casson nanofluid over a stretching sheet with solar thermal radiation: An optimal case study. Case Studies in Thermal Engineering (2021).