Evaporation of water in parallel microchannels is examined in the current research study. A simple model approach, based on thermodynamic considerations, enables the prediction in terms of a pre-calculation of a possible full evaporation of water in arrays of parallel microchannels. The model contains easily measureable values of the liquid fluid at the channel inlets such as temperature, pressure and mass flow. The model is verified using water with different microchannel designs and different microstructured inlet distribution geometries. A pressure range of up to ∼106 Pa with liquid fluid flow inlet velocities up to ∼0.8 m · s−1 is examined. Additionally, the model is verified using different heat fluxes and different phase transition lengths, the length of two-phase flow from bubble generation to total evaporation, in the microchannels. An empirical correction function is introduced to fit the idealized model with good agreement of about 5% to the real condition of the measurements and the process conditions. The adjusted model enables the pre-calculation of a possible total evaporation of water in the microchannel arrays by calculating the maximum liquid flow velocity at the channel inlets to achieve saturated steam inside the microchannels.

This content is only available via PDF.
You do not currently have access to this content.