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4.4. Two-dimensional Evaporating PVP/Water Spray in Air 93
Fig. 4.44: Photograph of the PVP/water spray formation with 112 kg/h liquid inflow
rate in experiment [206].
4.4.1 Experiment and Initial Data Generation
The PVP/water spray in air experiments have been carried out by the group of
Prof. G. Brenn by spraying a solution of 20% PVP and 80% water (by mass) through
the Delavan nozzle SDX-SE-90 at room temperature. The droplet sizes and velocities
are recorded at the cross sections of 0.08, 0.12 and 0.16 m away from nozzle orifice
using PDA, which provides both droplet size and velocity distributions, similar to the
water spray in air measurements. The liquid mass flow rate of these experiments is
112 kg/h and other conditions of the experiment such as gas velocity, gas temperature
and pressure are same as the water spray in air. Figure 4.44 displays the PVP/water
spray formation in experiment [206]. To generate the initial data for simulating the
PVP/water spray in air, the same procedure as outlined in two-dimensional water spray
in air is followed here. Figure 4.45 shows the experimental droplet size distribution
and the corresponding DQMOM approximation at the radial position 0.036 m from
the spray axis and 0.08 m downstream of the nozzle orifice.
4.4.2 Results and Discussion
PVP/water spray flow in air is modeled using the DQMOM where the bi-component
droplet evaporation of PVP/water droplets [172, 225, 226] are accounted through the
single droplet evaporation and solid formation model presented in Chapter 2 and the
results are discussed in Subsection 4.3.3. For droplet motion, droplet coalescence, the