Experimental investigation of free-surface jet impingement quenching process

Numerical simulation of the quenching process in liquid jet impingement

“…The transient boiling curve obtained from the DNS of quenching process matches well with the steady-state boiling curve obtained from the previous DNS study [24] under the constant wall temperature conditions, which is comparable to the experimental data of Robidou et al [3,4]. This is not consistent with the experimental observation reported in the literature [6][7][8][9][10][11] that the transient boiling curve has an initial boiling regime where the wall heat flux increases rapidly with decreasing wall temperature.…”

“…The cubic extrapolation matches well with the DNS prediction except during the initial period of quenching. This transient behavior in the boiling curve is similar to that observed in the previous experimental studies [6][7][8][9][10][11] and thus the initial boiling regime can be deduced to reflect a limitation in the experimental measurement rather than another heat transfer regime.…”

“…Most of the other experimental studies for film boiling in liquid jet impingement were conducted under transient or quenching conditions [1,[6][7][8][9][10]. Compared with the steady-state boiling curve, the transient boiling curve for a quenching process was observed to have an additional heat transfer regime, which occurs during the initial period of quenching and represents a rapid increase in the wall heat flux with decreasing wall temperature.…”

Boiling Heat Transfer Characteristics of Vertical Water Jet Impinging on Horizontally Moving Hot Plate

“…3) Many past studies have addressed the boiling heat transfer characteristics of impinging water jets on static hot solids, [6][7][8][9][10][11][12][13][14][15] whereas experiments involving moving hot solids have not been conducted…”

Rewetting and Boiling in Water Jet Impingement on High Temperature Steel Surface

“…On another hand, recent water jet quenching experiments [11,12,13,14] reported rewetting surface above 700°C without film boiling formation, despite initial surface temperature (Ti) as high as 1000°C. Karwa & Stephan [15] reported rewetting temperature equal to 650°C for water jet at 25°C and the heat flux was above 6 MW/m² in wetted region without boiling activity. They argued that the jet velocity and subcooling can suppress the bubbly activity and rewetting surfaces in excess of the critical temperature of the liquid can be achieved.…”