Effect of Viscosity and Heating Temperature on an Intermittent Spray Jet of Starch Dispersion

Abstract:

In this paper, an attempt was made to integrate the effect of jet injection time, load pressure and solution physical properties on jet breakup parameters. A starch-urea-borax complex solution was prepared and tested with an axi-symmetric full cone nozzle. The jet injection time was set to 100, 200, 300 and 400, the solution heating temperature was set to 20°C and 80°C ms, the load pressure was set to 1, 2, 3, 4, and 5 bar, and corresponding spray patterns were imaged by using a high speed camera. The imaging study of the developing spray patterns revealed that the unheated solution forms only spinning jets for all used load pressures. No jet breakup was seen in the near and far-nozzle imaged regions except at 5 bar load pressure, where minor spreading in the jet was seen after 80 mm downstream of the nozzle exit. At 80°C temperature and 5 bar load pressure, very dense spray patterns with an increased spray cone angle were emerging from the nozzle. After 300 ms of injection time, these developing spray jets were changed into fine spray patterns.

• Periodical: Applied Mechanics and Materials (Volume 695)
• Pages: 459-462
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.695.459
• Online since: November 2014
• Authors: Muhammad Yasin Naz*, Shaharin Anwar Sulaiman, Bambang Ari-Wahjoedi
• Keywords: Fluid Dynamics, Intermittent Spray, Spray Imaging, Thermal Energy

References

[1] L. J. Meinke, Z. Mayo, and T. J. Weissling, Pheromone delivery system: western corn rootworm (Coleoptera: Chrysomelidae) pheromone encapsulation in a starch borate matrix, Journal of Economic Entomology, vol. 82, pp.1830-1835, (1989).

DOI: 10.1093/jee/82.6.1830

[2] R. P. Mun, B. W. Young, and D. V. Boger, Atomization of dilute polymer solutions in agricultural spray nozzles, J. Non-Newtonian Fluid Mech., vol. 83, pp.163-178, (1999).

DOI: 10.1016/s0377-0257(98)00135-9

[3] M. Y. Naz, S. A. Sulaiman, B. Ariwahjoedi, and K. Z. Ku Shaari, Investigation of vortex clouds and droplet sizes in heated water spray patterns generated by axisymmetric full cone nozzles, ScientificWorldJournal, vol. 2013, p.796081, (2013).

DOI: 10.1155/2013/796081

[4] M. Y. Naz, S. A. Sulaiman, B. Ariwahjoedi, and K. Z. K. Shaari, Characterization of Modified Tapioca Starch Solutions and Their Sprays for High Temperature Coating Applications, The Scientific World Journal, vol. 2014, p. Article ID 375206, (2014).

DOI: 10.1155/2014/375206

[5] M. Y. Naz, S. A. Sulaiman, and B. Ariwahjoedi, Experimental study of airless spray jet breakup at elevated temperature and pressure, Applied Mechanics and Materials, vol. 393, pp.711-716, (2013).

DOI: 10.4028/www.scientific.net/amm.393.711

[6] C. Dumouchel, On the experimental investigation on primary atomization of liquid streams, Exp. Fluids, vol. 45, pp.371-422, (2008).

DOI: 10.1007/s00348-008-0526-0