Low boiling refrigerant(R134a)spray cooling can rapidly reduce the surface temperature.It is widely used in the thermal management of electronic equipment such as high-performance chips and biomedicine,and can achieve low temperature and efficient heat dissipation on the spray surface.Multi nozzle spray cooling can realize uniform cooling of large cooling surface and flexible control of cooling capacity.A refrigerant spray cooling test rig was set up to study the heat transfer characteristics of multi nozzle spray cooling on the surface,and to analyze the effects of nozzle outlet aperture,nozzle height,spray time and spray back pressure on the heat transfer characteristics of multi nozzle spray cooling surface.The results show that the nozzle aperture has the greatest influence on the cooling uniformity,followed by the nozzle spacing.Appropriate nozzle aperture(0.4 mm)and spacing(11 mm)can make the refrigerant spray reasonably distributed on the surface,and the lowest temperature Tmin can reach the minimum value.10 mm nozzle height and 1.2 MPa spray pressure can make the droplets fully atomized and extend the effective cooling time.
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