Volume 15, No. 5, October 2015, Pages 1699-1711 PDF(5.62 MB)
Time Function DualPDA Study of Spray Growth and Droplet Size-Velocity Profiles of Chemically Modified Tapioca Starch
Muhammad Yasin Naz1, Shaharin Anwar Sulaiman2, Zakaria Man3
1 Department of Fundamental and Applied Sciences, Universiti Teknologi PETRONAS, 32610 Seri Iskandar, Perak, Malaysia
2 Department of Mechanical Engineering, Universiti Teknologi PETRONAS, 32610 Seri Iskandar, Perak, Malaysia
3 Department of Chemical Engineering, Universiti Teknologi PETRONAS, 32610 Seri Iskandar, Perak, Malaysia
- We investigated the temporal spray growth of chemically modified tapioca starch.
- Pre-spray heated starch at 80°C underwent immediate breakup near nozzle exit.
- Overall SMD was reduced by 44.7% with change in nozzle size from 1.59 to 1.19 mm.
- Axial velocity initially dropped over time and then became constant after 300 ms.
- Unlike axial velocity, radial velocity showed notable decrease even after 300 ms.
This study investigated the time based spray evolution of chemically modified tapioca starch through three full cone nozzles namely FC-2, FC-3 and FC-3.5. The objective was to study the effect of temperature, viscosity and nozzle orifice diameter on spatio-temporal droplet size-velocity profiles of the sprayed material. Owing to high viscosity, the unheated spraying medium did not exhibit any breakup over time. However, pre-spray heating of the medium at 80°C caused immediate sheet breakup near nozzle exit point at injection pressure of 5 bar. The spray growth from FC-2 was relatively faster than other tested nozzles; the unstable sheet disintegrated into fully developed spray patterns after 250 ms of the injection time. Unlike FC-2, the jet from FC-3 and FC-3.5 exhibited steady breakup at early and late injection stages, however, relatively fast breakup was seen in the middle part of the spray stream. Phase Doppler Anemometry (DualPDA) data showed a linear increase in Sauter Mean Diameter (SMD) with orifice size. At 140 mm downstream, the smallest SMD of 59 µm was obtained with FC-2 nozzle followed by FC-3 (65 µm) and FC-3.5 (83 µm). The overall SMD was decreased by 44.7% with an increase in orifice diameter from 1.19 to 1.59 mm. The droplet velocity in axial direction dropped sharply with time in the range of 100 to 300 ms, thereafter showed negligible decrease over time. Unlike this, the droplet velocity in the radial direction was dropping appreciably even after 300 ms of injection time.
Tapioca starch; Hydraulic nozzle; Diameter statistics; High speed imaging; PDA.