Model of critical heat flux for spray cooling under vibration environment

The effect of vibration environment on critical heat flux (CHF) of spray cooling was studied. The point-based CHF model under vibration environment was built by defining factor which represented the degree of deviating from the inscription state, based on the CHF model in normal environment. Three operation modes were compared, and the operation mode one had 0.98% and 1.17% increase in the period-average CHF compared with the others. In the operation mode one, the curve of CHF showed a bimodal structure, and the minimum CHF of the second half of period was larger than that of the first half of period. The minimum CHF was 3.02% lower than the maximum CHF. The larger vibration amplitude led to the greater decrease of the CHF. The average CHF with 1.0 mm amplitude was 1.74% lower than that with 0.2 mm amplitude. The influence of spray angle was discussed. The average CHF showed 4.83% and 16.21% drop in 55.8° and 90° cases respectively, compared with 30° spray angle case. The difference between the minimum CHF of the second half of period and maximum CHF was smaller in larger spray angle case. Using nozzle with small spray angle could reduce the negative effect of vibration.