Numerical analysis of dominant parameters in synthetic impinging jet heat transfer process

Enhanced thermal performance with high-amplitude intermittent impingement cooling

“…Esmailpout et al [15] report a maximum increase of 28% beyond this threshold (Re = 5500,60 < f < 350 Hz). In contrast, heat transfer enhancement under this threshold was also reported by other studies [11,16] . Li et al [16] conclude that the optimal Strouhal number increases with Reynolds numbers (10000 < Re < 20000), and ranges between 0.24 and 0.48.…”

“…Li et al [16] conclude that the optimal Strouhal number increases with Reynolds numbers (10000 < Re < 20000), and ranges between 0.24 and 0.48. There are still many inconclusive and at times conflicting findings in the open literature: the thermal performance can be either increased [17][18][19][20] , declined [7,13,21] or no marked influence [8,16] .…”

Current Review on Numerical Simulation of Synthetic Jet (SJ) Cooling

“…The main findings by Li et al, [22] are that variations in St, result in inconsistent frequency effects on heat transfer at various intervals. The amplitude of the area averaged Nu would typically increase with an increase in Re or frequency within one cycle.…”

“…The flow field would be significantly altered by modifying either of the two parameters separately. According to Li et al, [22], Re affects the ideal frequency that results in the highest time-area averaged Nu. Most of the time, an increase in Re or frequency would demonstrate an increase in area averaged Nu during a period.…”

“…Li et al, [22] has performed a numerical investigation of how St, frequency, and Re affect the behaviours of a triangular SJ flow in terms of heat transfer. The main findings are that variations in St, or dimensionless stroke length, result in inconsistent frequency effects on heat transfer at various intervals.…”