title: Turbulence in continuous flow surface aeration systems.
abstract: Turbulence characteristics in an optimal continuous surface aeration system were investigated in this study. The experimental system consists of a rectangular tank, where flow is driven by equally spaced aerators placed on the liquid surface. The mass-transfer coefficient and turbulent parameters at the tank's inlet and outlet were measured to enable analysis of their interdependent relationships. The turbulence parameters are linked closely to the system's mass-transfer process. Turbulent bursting analysis has shown that ejection and sweep events govern the hydrodynamics of the systems. Turbulent intensity increases with increasing speed of rotation, and consequently the mass-transfer coefficient also increases. The universal probability distribution functions of the velocity fluctuations in continuous flow surface aeration systems follow the Gram-Charlier series, based on exponential distribution, and the theoretical and experimental curves match.
authors.affiliation: Department of Civil Engineering, Indian Institute of Technology Guwahati, Guwahati 781039, India E-mail: bimk@iitg.ernet.in.
authors.forename: Anurag
authors.initials: A
authors.lastname: Sharma
authors.affiliation: Department of Civil Engineering, National Institute of Technology Manipur, Manipur, India.
authors.forename: Thiyam Tamphasana
authors.initials: TT
authors.lastname: Devi
authors.affiliation: Department of Civil Engineering, Indian Institute of Technology Guwahati, Guwahati 781039, India E-mail: bimk@iitg.ernet.in.
authors.forename: Bimlesh
authors.initials: B
authors.lastname: Kumar
mesh_terms: D057446:Hydrodynamics; D011336:Probability; D013314:Stress, Mechanical; D013499:Surface Properties