Heat transfer of single-phase spray cooling on heated vibrating surfaces

Abstract

Effective vibration control has potential to enhance convective heat transfer. However, the precise heat transfer mechanism of single-phase spray cooling under vibration remains elusive. This study aims to elucidate this mechanism by establishing a closed-loop system for vibrating surface spray cooling. Various vibration parameters, including vibration Reynolds number (Rev), dimensionless acceleration number (Ac), amplitude, and frequency, were investigated experimentally to determine their impact on heat transfer. The research findings demonstrate that the heat flux, heat transfer coefficient, cooling efficiency, and vibration enhancement factor all decrease with an increase in Rev and amplitude. At a heating power of 200 W and Rev of 4947, the spray cooling performance on the vibrating surface is inhibited by 22%. However, as the heating power increases, the inhibitory effects of Rev and amplitude on the spray cooling heat transfer performance are weakened. Conversely, the amplitude and frequency enhance the heat flux, heat transfer coefficient, cooling efficiency, and vibration enhancement factor. At a heating power of 200 W and an Ac of 3.6, the spray cooling heat transfer performance on the vibrating surface is enhanced by 17%. Finally, a dimensionless correlation equation and a Nusselt number (Nu) prediction model for single-phase spray cooling under vibrating conditions are derived and fitted with an error of ±13.2%.

Keywords

• Single-phase spray cooling
• Vibrational Reynolds number
• Dimensionless acceleration number
• Heat transfer enhancement factor
• Dimensionless correlation