Critical Heat Flux in Saturated Forced Convection Boiling on a Heated Disk With an Impinging Jet

Abstract

Critical heat flux during forced convection boiling on an open heated disk being supplied with saturated liquids through a small round jet which impinges at the center of the disk has been studied experimentally employing refrigerant R12 at comparatively high pressures from 0.6 to 2.8 MPa. Generalized correlations, predicting the CHF within an experimental range of liquid-to-vapor density ratio 5.3–41.25 and the reciprocal of Weber number 2 × 10−3–2 × 10−7, are given for three different characteristic regimes: V-regime where the CHF increases with an increase in the jet velocity, I-regime where the CHF is nearly constant with jet velocity, and HP-regime where the CHF appears only at high pressure and again rises with an increase in the jet velocity.

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).…”

Assessment of high-heat-flux thermal management schemes

“…Boiling requires that the device temperature exceed the saturation temperature of Fluorinert liquid (56)(57)(58)(59)(60)(61)(62)(63)(64)(65)(66)(67)(68)(69)(70)(71)(72). The liquid adjacent to the device surface has to be superheated by a few degrees above the saturation temperature for the first bubbles to begin forming at and departing from the device surface.…”

“…In the absence of boiling, a free jet forms a radial wall jet that emanates from the impingement zone while remaining mostly in contact with the heated wall. During boiling, however, the vigorous effusion of vapor within the wall jet begins to splash away a significant portion of the wall jet liquid flow [63]- [66]. Further increases in heat flux result in the formation of dry patches in the outer circumference of the wall jet as much of the wall jet liquid is splashed away in these outer regions.…”

Numerical Simulations of Boiling Jet Impingement Cooling in Power Electronics

“…Many studies have been carried out with circular [10][11][12][13][14][15][16][17] as well as planar [18][19][20][21] jets in both free-surface and submerged configurations. This includes single and multiple jets [14,[22][23][24][25][26]. In the nucleate boiling literature, most of the correlations are cited in the following form:…”

“…When liquid cannot be supplied to this sub-layer, dry-out occurs, and CHF is reached. Considerable work has been done to develop non-dimensional correlations that show the dependence of the CHF on other parameters [13,25,[28][29][30][31][32]. Typically in the literature, empirical correlations are presented only for certain simple geometries.…”