Abstract
The paper presents investigation into the single water microjet surface
cooling producing evaporating film. Reported tests were conducted under
steady state conditions. Experiments were conducted using the nozzle size
of 70 and 100 μm respectively. In the course of investigations obtained
were experimental relations between heat flux and wall superheating. It
was proved that the phenomenon is similar to that of pool boiling but the
boiling curves are showing a smaller value of critical heat flux (CHF)
that the stagnant pool boiling. Values of CHF are also reduced with
decreasing liquid subcooling. Theoretical model of surface cooling by
evaporating microjet impingement in the stagnation point was described
theoreticaly. Results of experiments were compared with predictions by the
model showing a good consistency.
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