Experiments in Fluids

, 57:146 | Cite as

On the correspondence between flow structures and convective heat transfer augmentation for multiple jet impingement

Research Article


The correspondence between local fluid flow structures and convective heat transfer is a fundamental aspect that is not yet fully understood for multiple jet impingement. Therefore, flow field and heat transfer experiments are separately performed investigating mutual–jet interactions exposed in a self-gained crossflow. The measurements are taken in two narrow impingement channels with different cross-sectional areas and a single exit design. Hence, a gradually increased crossflow momentum is developed from the spent air of the upstream jets. Particle image velocimetry (PIV) and liquid crystal thermography (LCT) are used in order to investigate the aerothermal characteristics of the channel with high spatial resolution. The PIV measurements are taken at planes normal to the target wall and along the centreline of the jets, providing quantitative flow visualisation of jet and crossflow interactions. Spatially resolved heat transfer coefficient distributions on the target plate are evaluated with transient techniques and a multi-layer of thermochromic liquid crystals. The results are analysed aiming to provide a better understanding about the impact of near-wall flow structures on the convective heat transfer augmentation for these complex flow phenomena.

List of symbols


Regression coefficient


Discharge coefficient


Jet diameter (m)


Mass velocity (kg/(m\(^2\) s))


Heat transfer coefficient (W/(m\(^2\) K))


Length of impingement hole (m)


Exponent of Reynolds number


Nusselt number


POD mode number


Vortex identification criterion


Reynolds number


Dispersion coefficient


Velocity (m/s)


Fluctuating velocities (m/s)


Streamwise velocity component (m/s)


Vertical velocity component (m/s)


Coordinate system


Streamwise jet spacing (m)


Channel width/spanwise jet spacing (m)


Separation distance (m)





Jet diameter



\(\infty \)

Free stream conditions


Maximum value



Liquid crystal thermography


Particle image velocimetry


Proper orthogonal decomposition


Thermochromic liquid crystals


Vortex centre


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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  1. 1.Institute of Aerospace ThermodynamicsUniversität StuttgartStuttgartGermany

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