In this research, experimental investigation and the computational fluid dynamic (CFD) simulation of a cryogenic condenser for oxygen liquefaction was carried out. The liquid nitrogen used as cooling fluid. section, three-dimensional model with structured mesh high quality aspect ratio skewness considered. multi-phase flow inside studied numerically, using volume (VOF) method. This work also ex...

Boiling heat transfer is a superior heat transfer technology using the latent heat transport with phase-change. However, it has been difficult to employ as a cooling technology for electronics because the unstable transition boiling and film boiling with excessive high temperature are impossible to control. In highly subcooled boiling, the coalescing bubbles formed on the heating surface collap...

The onset of nucleate boiling in the flow of water through a microchannel heat sink was investigated. The microchannels considered were 275 lm wide by 636 lm deep. Onset of nucleate boiling was identified with a high-speed imaging system and the heat flux at incipience was measured under various flow conditions. An analytical model was developed to predict the incipient heat flux as well as the...

The phenomena of microlayer formation and its dynamic characteristics during the nucleate pool boiling regime have been widely investigated in past. However, experimental works on real-time dynamics flow conditions are highly scarce. present work is an attempt to address this lacuna concerned with developing a fundamental understanding growth process single vapour bubble under conditions. Boili...

Stable power processes are never guaranteed. An assortment of unstable behaviors wrecks power apparatus, including mechanical vibration, malfunctioning control apparatus, unstable fluid flow, unstable boiling of liquids, or combinations thereof. A necessary condition for stable reactor power is that the reactor distortion accompanying a temperature rise decreases the reactivity, thus slowing an...

Advanced methods that use continuity wave equations in fluid flow paths and exact solutions of these and all other differential equations are applied to transient performance models of a counter flow heat exchanger and an Advanced Boiling Water Reactor (ABWR). The continuity wave equations for single and two-phase flow, with heat addition, are developed, and the exact solution for a typical lea...

The calculated freezing point depression of freshly excised boiled mammalian tissue is approximately the same as that of plasma. The boiling procedure was chosen to eliminate the influence of metabolism on the level of the freezing point depression. Problems created by the boiling, such as equilibrium between tissue and diluent, change in activity coefficient by dilution, and loss of CO(2) cont...

Flow boiling of HFE 7000 in five parallel microchannels of 222 m hydraulic diameter, each containing a single row of 24 in-line 100 m pin fins, was investigated. High speed photography revealed the dominant flow patterns, namely, the bubbly flow, the multiple flow, and the wavy-annular flow. The interaction of the bubble with the pin fins during nucleate boiling from G 350 kg /m2 s to G 827 kg ...