Forced-convection boiling was investigated with a dielectric coolant (FC-72) in order to address some of the practical issues related to the two-phase cooling of multichip modules. The module used in the present study featured a linear array of nine, 10 x 10 mm, simulated microelectronic chips which were flush-mounted along a 20mm wide side of a rectangular channel. Experiments were performed w...

This paper presents the results of an experimental study subcooled water flow boiling on surface a metal rod 12 mm in diameter. As result rapid heat release that occurs when electric current is pulsed through heater, latter reaches certain temperature levels above saturation at corresponding pressure ( p = 0.17 MPa). In system formed by cold liquid and heated solid body, process intense exchang...

The ability to predict critical heat flux (CHF) is of considerable interest for high-heat equipment, including nuclear reactors. CHF prediction from a mechanistic model subcooled flow boiling in rod bundles still remains unsolved. In this paper, we try the an annulus, which most basic geometry simplified fuel bundle, using liquid sublayer dryout model. validated with both water and R113 data, s...

We present an original model describing the transient flow boiling crisis of water at high subcooling and atmospheric pressure. hypothesize that in such conditions, mechanism is prevention bubbles recondensation when a thin fluid layer near heated wall reaches temperature saturation conditions. To capture this phenomenon, we propose energy heat exchanges throughout entire from initiation to cri...

We elucidate the separate effect of a thin Cr coating deposited by physical vapor deposition (PVD) on subcooled flow boiling performance zircaloy-4. First, we run experiments prototypical zircaloy-4 surfaces mimicking scratch pattern and surface roughness nuclear reactor claddings. Then, PVD-coat 0.3 µm thick chromium layer same exact repeat investigations. All are using deionized water at atmo...

Two-phase pressure drop oscillations during flow boiling of pure fluid R245fa in a horizontal microchannel with diameter 0.9 mm were experimentally investigated. Three mass fluxes G = 400, 630, and 1100 kg/m2 s three different heat q 40, 50, 55 kW/m2 tested under the inlet 211.72 kPa subcooling 17 K. Flow instabilities analyzed based on images temporal oscillation results two-phase flux (G), (Δ...