The physics of coal liquid slurry atomization. Annual topical report, 14 March 1993--14 March 1994
The stability of turbulent columns of liquid injected into a quiescent environment has been studied. Turbulence decay along Newtonian jets was investigated along with the effects of turbulence on the resulting droplet size distributions after breakup. Disintegration of liquid jets injected into a high-velocity gas stream has also been studied. Newtonian and non-Newtonian liquids were studied with particular emphasis on the non-Newtonian rheological characteristics. Determination was made of the extent that the addition of high molecular weight polymer to liquids changes the breakup process. Shear thinning, extension thinning and extension thickening fluids were investigated. The non-Newtonian viscosities were measured over five decades of shear rates for 12 solutions of polymeric materials. By using the die-swell technique, the first normal stress difference was determined for all solutions. By using the contraction flow technique, the extensional viscosity levels were determined for the most viscous solutions. The near field produced by a co-axial airblast atomizer was investigated using the phase Doppler particle analyzer. The classical wave mechanism and empirical models reported for air-blast atomization of low viscosity liquid were shown to be applicable to air-blast atomization of viscous non-Newtonian liquids. The theoretical basis of several models which give the best fit to the experimental data for air-blast atomization of non-Newtonian liquids was addressed. Conclusions to date are discussed for the following areas: Turbulence characteristics in liquid jets; The effect of turbulence on the stability of liquid columns; The rheology of mobile polymeric solutions; and Air blast atomization of non-Newtonian liquids.
- Research Organization:
- Carnegie-Mellon Univ., Pittsburgh, PA (United States). Dept. of Mechanical Engineering
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG22-92PC92152
- OSTI ID:
- 10158830
- Report Number(s):
- DOE/PC/92152-T9; ON: DE94013482; BR: AA1505000; TRN: AHC29413%%9
- Resource Relation:
- Other Information: PBD: [1994]
- Country of Publication:
- United States
- Language:
- English
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