Flow boiling of 1-methoxyheptafluoropropane (HFE 7000) in 222 m hydraulic diameter channels containing a single row of 24 inline 100 m pin fins was studied for mass fluxes from 350 kg /m2 s to 827 kg /m2 s and wall heat fluxes from 10 W /cm2 to 110 W /cm2. Flow visualization revealed the existence of isolated bubbles, bubbles interacting, multiple flow, and annular flow. The observed flow patte...

Boiling heat transfer has a combination of sensible liquid and latent due to vaporization. To examine the in boiling, thermometry liquid-vapor multiphase flow must play significant role. Although there are several optical methods proposed for boiling phenomena, it is challenging directly measure temperature field at relatively high flux many bubbles' interruption illumination observation. This ...

Boiling water in small channels that are formed along turbine blades has been examined since the 1970s as a means to dissipating large amounts of heat. Later, similar geometries could be found in cooling systems for computers, fusion reactors, rocket nozzles, avionics, hybrid vehicle power electronics, and space systems. This paper addresses (a) the implementation of two-phase microchannel heat...

Demand for high-performance cooling systems is one of the most challenging and virtual issues in the industry and Pulsating heat pipes are effective solutions for this concern. In the present study, the best predictor correlations of flow boiling and condensation are taken into account to model a single turn pulsating heat pipe mathematically. These considerations, result in derivation of more ...

With the long-term objective of Critical Heat Flux (CHF) prediction, a Direct Numerical Simulation (DNS) framework for simulation of subcooled and saturated nucleate pool boiling is developed. One case of saturated, and three cases of subcooled boiling at different subcooling levels are simulated. Grid refinement study is also reported. Both boiling and condensation phenomena can be computed si...

Title of dissertation: DIRECT NUMERICAL SIMULATION OF INCOMPRESSIBLE MULTIPHASE FLOW WITH PHASE CHANGE Moon Soo Lee, Doctor of Philosophy, 2015 Dissertation directed by: Professor Amir Riaz Department of Mechanical Engineering Phase change problems arise in many practical applications such as air-conditioning and refrigeration, thermal energy storage systems and thermal management of electronic...

New energy vehicles have better clean and environmental protection characteristics than traditional fuel vehicles. The new engine cooling technology is critical in the design of This paper used one-and three-way joint simulation methods to simulate refrigeration system Firstly, a k-ε turbulent flow model for pump field established based on principle computational fluid dynamics. Then, CFD comme...