The heat transfer characteristics of the microwave heating coupled with
atomization feeding were investigated using ethanol as the spray medium on a
pressure swirl nozzle. The effects of spray height, flow rate and
temperature on the sauter mean diameter (SMD) of atomized droplets were
examined. The results showed that the droplet SMD was 12-130 ?m, which
increased with the spray height and decreased with the flow rate and
temperature of spray medium. Through the fitting of the experimental data,
the dimensionless correlation of the droplet SMD which was based on orifice
diameter, Reynolds and Ohnesorge numbers was obtained. The calculated
results were basically consistent with the experimental data within 15%
error. The heat transfer characteristics of atomized droplets on
high-temperature surface of SiC bed heated by microwave were then
investigated. The effects of spray flow rate, spray height and spray
temperature on the heat transfer characteristics were examined. The power of
spray heat transfer decreased with the temperature and increased with the
spray flow rate and spray height. The dimensionless correlation to describe
the heat transfer characteristics of atomized droplets on the
high-temperature SiC surface under the microwave heating was obtained which
included thermophysical properties of spray medium, spray parameters, and
temperatures of the high-temperature bed surface and spray medium, with the
error of ?20%. These correlations can be used to predict the SMD of the
atomized droplets and the power of spray heat transfer in the microwave
heating process.
Performance of Siloxane Mixtures in a High-Temperature Organic Rankine Cycle Considering the Heat Transfer Characteristics during Evaporation