Natural Convection Heat Transfer in Vertical Channels
Summary
Natural convection in vertical channels arises when a fluid adjacent to heated walls experiences buoyancy forces that drive upward motion, inducing a circulation that transfers heat without external pumping. The interplay between boundary-layer development along vertical surfaces, fluid properties and channel geometry governs flow stability, transition to turbulence and overall heat transfer rates. Dimensionless groups such as the Rayleigh and Grashof numbers characterise the balance between buoyant and viscous forces, while the Nusselt number quantifies the efficiency of convective transport relative to conduction. Applications span electronic cooling, solar collectors, building ventilation and reactor safety, where the simplicity of passive cooling must be balanced against performance demands. Recent advances have explored the effects of thermal stratification, surface roughness and microstructuring on flow enhancement or suppression, as well as novel measurement and modelling techniques to resolve near‐wall interactions and develop reduced‐order boundary conditions for complex surfaces.
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Natural Convection Heat Transfer in Vertical Channels publication trend
The graph below shows the total number of articles in natural convection heat transfer in vertical channels across all publications each year (not limited to Nature Index journals).
Technical terms
Natural convection: Fluid motion induced by buoyancy forces arising from temperature‐dependent density differences.
Rayleigh number: Dimensionless parameter expressing the ratio of buoyant to viscous and thermal diffusion effects in a fluid layer.
Nusselt number: Dimensionless measure of convective heat transfer relative to conduction across a boundary layer.
Boussinesq approximation: Simplification treating density as constant except where it generates buoyancy forces.
Thermal stratification: Formation of stable temperature layers in a fluid due to density gradients, affecting flow development.
References
- Effects of thermal stratification on natural convection in a symmetrically heated channel: Comparison of characteristic quantities between air and water. Case Studies in Thermal Engineering (2023).
- A homogenization approach for buoyancy-induced flows over micro-textured vertical surfaces. Journal of Fluid Mechanics (2022).
- An experimental and numerical study of laminar natural convection along vertical rib-roughened surfaces. International Journal of Heat and Mass Transfer (2024).
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