Quenching Phenomena Associated With a Water Wall Jet: I. Transient Hydrodynamic and Thermal Conditions

Delay of wetting propagation during jet impingement quenching for a high temperature surface

“…A shutter (24) is mounted in front of the nozzle to prevent water from striking the block (1) prematurely and to maintain a constant water temperature by forcing it to run within a closed loop system. The desired temperature of the water is obtained by controlling the main heater (4), auxiliary heater (7) or by adding cooling water (23) to the heat exchanger (5). The desired initial temperature of the block (1) is achieved by heating it with an electrical heater mounted around the block.…”

“…Moreover, the mechanism for defining this temperature, if a single mechanism actually exits, is not well established and numerous proposals have been made [2]. Studies of jet impingement quenching for multiphase heat transfer have been performed by many researchers [2][3][4][5][6][7]. Heat flux, temperature, and the flow field by flow visualization were studied extensively in those investigations.…”

Experimental Investigation of High-temperature Steel Plate Cooled by Multiple Nozzle Arrays

“…The cooling curves herein were similar to the previous reports about the single impinging cooling. 19,20) Since the jet impinged on the surface (0.0 s), a sharp temperature decrease was observed at the stagnant points in the wetted states regardless of the variation of Reynolds number (Re), as shown in Figs. 8(a)-8(c).…”

Heat Transfer Characteristics during Quench of High Temperature Solid

“…It is found from Fig.3 that the maximum heat flux point appears slightly behind the wetting front. Filipovic et al [11] called this as precursor phenomenon. The surface temperature sharply drops and inversely heat flux is rapidly increased between the wetting front and the maximum heat flux position.…”

“…In other words, the maximum heat flux appears when a heat supply from the solid just balances cooling limit of liquid, which is decreasing with the radial position. Filiporic et al [11] carried out quench of high temperature surface using a wall jet and pointed out that a repetition of wet and dry, which corresponds to transition boiling, takes place and then the maximum heat flux is reached. Figure 4 shows a flow pattern identified from video image.…”