Impinging Jet Heat Transfer Dynamics

Impinging jets represent a fundamental technique for enhancing convective heat transfer by directing a fluid jet perpendicular or oblique to a target surface. Upon impact, the jet decelerates and spreads radially, creating a stagnation region where thermal gradients and shear forces intensify, leading to elevated local heat transfer coefficients. Critical parameters include jet Reynolds number, nozzle geometry, stand-off distance and the thermal properties of the working fluid. The interplay of turbulent structures and thermal boundary layers governs overall heat exchange, with peak heat fluxes often occurring slightly offset from the geometric stagnation point due to flow compression and anisotropic transport. Variants such as synthetic jets, nanofluid-laden flows and multi-jet arrays have been developed to tailor flow unsteadiness, augment mixing and suppress boundary-layer growth. Computational modelling using Reynolds-Averaged Navier–Stokes and large-eddy simulation approaches provides insight into unsteady transport processes and entropy-generation mechanisms. Impinging jet systems find global application in electronics cooling, metal quenching, chemical reactors and high-flux thermal management, offering energy-efficient and scalable solutions. Recent advances have emphasised accurate prediction of near-wall phenomena, integration of phase-change effects and optimisation of impingement geometry to meet diverse industrial demands.

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Impinging Jet Heat Transfer Dynamics publication trend

The graph below shows the total number of articles in impinging jet heat transfer dynamics across all publications each year (not limited to Nature Index journals).

Technical terms

Reynolds number: Dimensionless ratio of inertial to viscous forces, indicating whether a flow is laminar or turbulent.

Stagnation point: Location on the impinged surface where fluid velocity falls to zero and pressure and heat-transfer rates reach a maximum.

Nusselt number: Dimensionless parameter representing convective heat transfer relative to conductive transport across a boundary layer.

Turbulence model: Computational framework, such as RANS or LES, used to approximate the influence of turbulent fluctuations on mean flow and heat transfer.

References

1. A review of jet impingement cooling. International Journal of Thermofluids (2023).
2. Heat Transfer Augmentation through Different Jet Impingement Techniques: A State-of-the-Art Review. Energies (2021).
3. PIV measurements of isothermal plane turbulent impinging jets at moderate Reynolds numbers. Experiments in Fluids (2017).
4. Numerical Study of the Normal Impinging Water Jet at Different Impinging Height, Based on Wray–Agarwal Turbulence Model. Energies (2020).
5. A Numerical Study of a Submerged Water Jet Impinging on a Stationary Wall. Journal of Marine Science and Engineering (2022).
6. Near-Wall Thermal Processes in an Inclined Impinging Jet: Analysis of Heat Transport and Entropy Generation Mechanisms. Energies (2018).
7. Quench cooling of fast moving steel plates by water jet impingement. International Journal of Heat and Mass Transfer (2020).