Flow Boiling Instabilities

This lecture covers the historical development of flow boiling, from fundamental issues to stabilization techniques in microchannels. It discusses heat transfer mechanisms, flow patterns, and instabilities observed in microchannels. The presentation includes the design principles for lubricant-infused surfaces, the effect of noncondensable gases, and flow boiling regimes in horizontal and vertical orientations. The instructor explains the Hewitt and Roberts map, heat flux map, and flow boiling instabilities. The lecture also explores the experimental evaluation of micro pin fins and re-entrant cavities in flow boiling. Various concepts such as flow loop design, severe pressure drop oscillation, and density wave oscillations in microchannels are analyzed.