Heat Transfer Enhancement Techniques in Tube Heat Exchangers

Heat transfer enhancement in tube exchangers encompasses a range of passive and active techniques designed to augment the rate of thermal exchange between fluid streams. Passive methods rely on geometric modifications or surface treatments to the tube, including twisted tapes, wire coils, labyrinth channels and enlarged surface cavities, which disrupt the thermal boundary layer and induce secondary flows. Active strategies employ external energy sources such as electric fields, acoustic excitation or magnetic fields to generate micro-mixing and turbulence. Recent advances in nanotechnology have seen the introduction of nanofluids—base fluids containing dispersed nanoparticles—to improve effective thermal conductivity and heat capacity. Swirl flow generators, such as twisted tubes and helical static mixers, characteristically impose a helical velocity field that increases convective heat transfer by enhancing radial mixing and mitigating thermal stratification. Entropy generation minimisation has emerged as a framework for optimising the balance between heat transfer augmentation and pressure-drop penalties, guiding the design of novel tube profiles and insert configurations. Together, these techniques have demonstrated potential to reduce exchanger size, lower operating costs and enable more sustainable process systems across power generation, chemical processing and renewable energy applications.

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Heat Transfer Enhancement Techniques in Tube Heat Exchangers publication trend

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

Technical terms

Nusselt number: Dimensionless parameter expressing the ratio of convective to conductive heat transfer at a surface.

Reynolds number: Dimensionless quantity representing the ratio of inertial to viscous forces in a fluid flow.

Nanofluid: Suspension of nanoparticles in a base fluid to enhance thermal properties.

Turbulator: Internal insert employed to induce turbulence and disrupt thermal boundary layers.

Swirl flow generator: Device such as a twisted tape that imposes a helical flow pattern to improve mixing.

Entropy generation: Measure of irreversibility in thermal processes, linked to energy degradation.

References

1. Enhancing heat transfer in a heat exchanger: CFD study of twisted tube and nanofluid (Al2O3, Cu, CuO, and TiO2) effects. Case Studies in Thermal Engineering (2024).
2. Analysis of heat transfer enhancement due to helical static mixing elements inside cooling channels in machine tools. The International Journal of Advanced Manufacturing Technology (2023).
3. Numerical investigation of entropy generation of turbulent flow in twisted tri-lobed tubes. Case Studies in Thermal Engineering (2023).