To investigate the influences of volume flow rate

groove depth

and groove width on the performance of the spray cooling system

an opened spray cooling system with distilled water was established. The experimental results indicate that if the groove depth is 0.8 mm

the surface coefficient of heat transfer increases by 41% and 8.5% at the volume flow rate of 0.45 L/min and 1.25 L/min respectively as the groove width reduces from 4 mm to 1 mm. If the groove width is 2 mm

the surface with a groove depth of 0.8 mm has the largest heat flux enhancement at the volume flow rate of 0.45 L/min

and the heat flux and surface coefficient of heat transfer are 198.5 W/cm2 and 2.75 W/(cm2?K) respectively

which are enhanced by 21.25% and 30.95% relative to the flat surface at the volume flow rate of 0.45 L/min. When the volume flow rate is 1.25 L/min

heat transfer is enhanced with the increase in groove depth. On the above basis

non-dimensional criterion equations about micro-grooves surface were derived

in which the structure parameters of micro-grooves surface on heat transfer were considered.