HYDRODYNAMIC TESTS OF SMALL-SIZED CIRCULATING WATER COOLING DEVICES

摘要

This article presents a method for determining the hydrodynamic drag coefficient of sprinklers of small-sized circulating water cooling devices (mini cooling towers). Two types of mini cooling towers were compared (a small-sized cooling tower with a helical air flow and counterflow). For hydrodynamic testing, an experimental setup was developed and fabricated. The experiments to determine the drag coefficient were carried out depending on the air flow rate ranging from 0.5 to 3.0 m/sec and irrigation density ranging from 0 to 12 m(3)/(m(2)center dot h). It was shown that OB-65 sprinkler (for a mini tower with a helical air flow and a mesh shell diameter of 65 mm) has a higher hydrodynamic drag coefficient than OGGT-65 sprinkler (for a counterflow tower with a mesh shell diameter of 65 mm) with equal experimental parameters. The obtained hydrodynamic drag coefficients are approximated as linear relationships in the logarithmic coordinates of the hydrodynamic drag and Reynolds number. It is established that the drag coefficient is determined by the generalized relation A/Re-K.