Enhanced flow boiling in silicon nanowire-coated manifold microchannels

Advances in micro and nanoengineered surfaces for enhancing boiling and condensation heat transfer: a review

“… 164 An innovative 3D manifold microchannel design integrated with silicon nanowires has been shown to reduce these fluctuations considerably. 165 While the top manifold enables vapor escape, the bottom microchannel exhibits enhanced thin film evaporation via enhanced capillarity through interconnected nanocavities. In addition, surface wetting shifts from being hydrophilic before tests to hydrophobic after tests leading to degradation in performance at high mass flux/heat flux operating conditions where capillarity would otherwise have led to enhancements.…”

Pressure and Thermal Characterisation of Dynamic Instabilities During Flow Boiling in Micro/Mini-channels at Different Azimuth Orientations

“…Compared to the length scales of typical bubbles in two-phase flow, the relatively small cross-sectional size of micro and mini-channels make them particularly susceptible to impacts of flow instability [4] which can result in different degrees (mild to severe) fluid motion fluctuations. Such fluctuations can cause mechanical vibrations which can damage components, produce noise in control sensors [5] and can result in variable heat transfer performance [6]. Under severe conditions the flow directions can temporarily reverse.…”

Dimensionless Analysis of the Effects of Junction Angle on the Gas-Liquid Two-Phase Flow Transition and the Scaling Law of the Microbubble Generation Characteristics in Y-Junctions

“…Microfluidic technology is attracting considerable interest in varied areas, e.g., chemical, biochemical and pharmaceutical technology [1][2][3][4]. The characteristics, namely large ratios between surface and volume and large coefficients of heat and mass transfer, make microchannel become desirable for these applications [5][6][7][8]. Due to the scale miniaturization and efficient and controllable generation process, one of the key points of the microfluidic devices is to generate micro-bubble/droplet with specific characteristics which strongly depends on the two-phase flow patterns.…”