An experimental study on the jet breakup of Bingham plastic slurries in air

• Published in: Experimental thermal and fluid science 2019-04, Vol.102, p.271-278
• Main Authors: Csizmadia, Péter, Till, Sára, Hős, Csaba
• Format: Article
• Language: English
• Subjects: Ashes; Bingham plastic fluid; Bingham plastics; Breakup; Jet breakup; Orifices; Particle size distribution; Plastics; Pressure; Rheological properties; Rheology; Size distribution; Slurries; Slurry; Wind effects
• ISSN: 0894-1777; 1879-2286
• DOI: 10.1016/j.expthermflusci.2018.12.006

[Display omitted] •The jet breakup length of Bingham plastic slurries are studied experimentally.•The ash-to-water concentration and exit Weber-numbers were varied.•Increasing correlation was found for breakup length as a function of Re, Fr, We0.5.•The rheology and particle size distribution of the ashes were measured and reported. The aim of this experimental study is to determine the jet breakup of non-Newtonian, Bingham plastic slurries in air, notably to obtain an experimentally verified formula for the breakup length. The ash-to-water concentration varies between appr. 9% and 57% resulting in Ohnesorge-numbers between 0.0215 and 0.0476. The Bingham plastic fluid discharge from a circular orifice and the jet exit Weber-numbers were varied between 983 and 46866. The Hedström-numbers are between 172 and 235, the Reynolds-numbers were in the range of 906–7169 and the tested Froude-numbers are between 7.06 and 42.13 at standard temperature and ambient pressure. Most of our experiments fall into the second wind-induced regime. A linearly increasing correlation was found for the dimensionless breakup length as a function of We, the Reynolds-, and the Froude-number. The rheology and the particle size distribution of the (fly and bottom) ash were measured and are reported, respectively.