Mathematical model of water droplets evaporation in air stream
DOI:
https://doi.org/10.15587/1729-4061.2013.14856Keywords:
evaporative air cooling, mathematical model, gas turbine plant, heat and mass transfer, diameter of a dropletAbstract
Capacity of a gas turbine power plant strongly depends on the ambient temperature, making it profitable in many cases to cool air supplying water in the air stream. The article identifies the key provisions and presents the equations that describe the process of evaporation of water droplets in the air stream. The model is based on commonly known and chacked dependences of Nu = f (Re, Pr); Sh = f (Re, Sc). The developed system of equations allows finding the parameters of humid air, depending on the time of a process. In particular, it is possible to calculate the evaporation of a droplet in limited space and to determine time required for complete saturation of the air. This permits to use the above equations to determine the optimal initial diameter of a droplet and the required distance from the injection system of cooling water to the input of the gas turbine engine, which would provide evaporative cooling with the best effect.
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