This paper was presented at the 4th Micro and Nano Flows Conference (MNF2014), which was held at University College, London, UK. The conference was organised by Brunel University and supported by the Italian Union of Thermofluiddynamics, IPEM, the Process Intensification Network, the Institution of Mechanical Engineers, the Heat Transfer Society, HEXAG - the Heat Exchange Action Group, and the Energy Institute, ASME Press, LCN London Centre for Nanotechnology, UCL University College London, UCL Engineering, the International NanoScience Community, www.nanopaprika.eu.Pressure changes caused by the growth of confined bubbles during flow boiling in mini/microchannels lead to transient flow reversal in the presence of inlet (upstream) compressibility. A 1-D model is presented to study the effect of inlet resistance on maximum flow reversal distance, return time and local pressure fluctuations for different initial upstream compressible volumes for water boiling at atmospheric pressure. The two upstream compressibility models considered are condensable vapour in a subcooled boiling region and trapped non-condensable gas
