Eton Ng investigated the flow through and around car radiators
for his PhD thesis at RMIT University. The Cobra Probe was used
to map the flow around a vehicle radiator and therefore validate
a new pressure based technique for evaluating the flow through
radiators during on-road testing (Ng,
Watkins & Johnson 2004; Ng 2002). The images at right are
courtesy of Eton Ng.
In the image at right, a Cobra Probe is mounted
on a 3-axis traverse (also built by TFI - see Other
products). The wind tunnel working section is 300x300 mm and has
a section of a radiator core filling the entire cross section.
The second image at right shows a Cobra Probe
in front of a section of a car radiator core. The Probe in this
picture features a head size of just 1.3 mm (each of the pressure
taps in the Probe head are 0.25 mm diameter).
The third and final image at right shows the
velocity map obtained with the Cobra Probe flow-mapping module
(contour plot created with TecPlot®). The map area corresponds
to the section of radiator core surrounded with cello tape in
the image above.
The red areas correspond to the high-speed flow
through the fins while the blue regions illustrate the wake of
the fin separator. The latter is visible just below the Probe
in the image above (the probe measurement grid was not quite level,
which, combined with the coarse grid, is why there is a ‘step’
in the blue region).