Transition from elongated bubbles to annular flow regime is one of the most intricate phenomena in boiling microchannels. To identify this transition, maps have been introduced primarily based on visualizations and characterized using average properties. However, understanding mechanism responsible for transition demands accurate determination hydrodynamic characteristics liquid films around va...

Heat transfer operations in microchannel are of special relevance designing micro-devices involving accumulation high heat flux. The current study explores simultaneously developing, unsteady laminar flow inside a twisted sinusoidal wavy and involved. A square cross-sectioned channel is taken for the study. nature as well about axis. modified geometry helps enhancing out plane mixing fluid form...

This paper describes a σ -coordinate scalar transport model coupled with a Boussinesq-type hydrodynamic model. The Boussinesq model has the ability to calculate both three-dimensional velocity distributions and the water surface motion. To capture ‘dispersion’ processes in open channel flow, horizontal vorticity effects induced by a bottom shear stress are included in the Boussinesq model. Thus...

The effects of orientation on flow boiling critical heat flux (CHF) were investigated using high-speed video and microphotographic techniques. Interfacial features were measured just prior to CHF and statistically analyzed. A dominant wavy vapor layer regime was observed for all relatively high-velocities and most orientations, while several other regimes were encountered at low velocities, in ...