Verification of Baffle Factor for Straight Pipe Flow

• Autorzy: Artichowicz W. , Łuczkiewicz A. , Sawicki J. M.

Identyfikatory

DOI

10.1515/heem-2018-0003

• Języki publikacji: EN

Abstrakty

EN

The baffle factor is a parameter widely used to describe flow system characteristics. This indicator is very important in designing disinfection devices. For example, it is used to convert the plug flowtime to the actual fluid residence time in the flowsystem of interest. Its accurate determination is a complex problem requiring tracer experiments or computational fluid dynamics simulations. Therefore, in practice, it is often taken from tables provided in the literature. The literature sources, however, state that the baffle factor for a flow in a straight pipe is equal to unity, which implies the identity between the pipe flow model and the plug flow model. This assumption is doubtful. The aim of the present work is to verify the baffle factor values assumed for the pipe flow. The merit of this study is the analytical derivation of the expression describing the baffle factor value with respect to flow characteristics. To this purpose, the analytical solution of a one-dimensional advection-diffusion equation with a Heaviside initial condition was used. It was demonstrated that the aforementioned assumption is wrong, as the baffle factor for a straight pipe is significantly less than unity.

Słowa kluczowe

EN

disinfection chamber; baffle factor; pipe flow

• Wydawca: Institute of Hydro-Engineering of Polish Academy of Sciences
• Czasopismo: Archives of Hydro-Engineering and Environmental Mechanics
• Rocznik: 2018
• Tom: Vol. 65, nr 1
• Strony: 31--39
• Opis fizyczny: Bibliogr. 11 poz., rys., tab.

Twórcy

autor

Artichowicz W.

• Gdańsk University of Technology, Faculty of Civil and Environmental Engineering, ul. G. Narutowicza 11/12, 80-233 Gdańsk, Poland

autor

Łuczkiewicz A.

• Gdańsk University of Technology, Faculty of Civil and Environmental Engineering, ul. G. Narutowicza 11/12, 80-233 Gdańsk, Poland

autor

Sawicki J. M.

• Gdańsk University of Technology, Faculty of Civil and Environmental Engineering, ul. G. Narutowicza 11/12, 80-233 Gdańsk, Poland

Bibliografia

• Chapra S. C. (1994) Surface Water-Quality Modeling, New York: McGraw Hill Company.
• Colorado Dept. of Public Health and Environment,Water Quality Control Division, Safe Drinking Water Program (2014) Baffling Factor Guidance Manual. Determining Disinfection Capability and Baffling Factors for Various Types of Tanks at Small Public Water Systems, Version 1.0, March 2014.
• Fukukoka S., Sayre W. W. (1973) Longitudinal Dispersion in Sinuous Channel, Am. Soc. Civ. Eng., 99 (HY1), 195–217.
• Masschelein W. J. (1992) Unit Processes in Drinking Water Treatment, CRC Press.
• Paccione J. D., Follansbee D. M., Young P. L., Dziewulski D. M. (2016) Analytical Determination of the Baffle Factor for Disinfection Contact Systems Based on Hydraulic Analysis, Disinfection Kinetics, and Ct Tables, J. Environ. Eng., ASCE, DOI: 10.1061/(ASCE)EE.1943-7870.0001094.
• Rehmann C. R. (2015) Explicit Estimates of Arrival Times for Dispersion in Rivers, J. Hydraul. Eng., 141 (11), DOI: 10.1061/(ASCE)HY.1943-7900.0001051.
• Rutherford J. C. (1994) River Mixing, Chichester: John Wiley and Sons.
• Taylor G. L. (1954) The Dispersion of Matter in Turbulent Flow Through a Pipe, Proc. Royal Soc., London, Ser. A, 223, 446–468, DOI: 10.1098/rspa.1954.0130.
• U.S. EPA. (1989) Surface Water Treatment Rule, 40 CFR Parts 141 and 142, Washington DC.
• U.S. EPA. (1991) Guidance Manual for Compliance with Filtration and Disinfection Requirements for Public Water Systems Using Surface Water Sources, Washington DC.
• Wilson J. M., Venayagamoorthy S. K. (2010) Evaluation of Hydraulic Efficiency of Disinfection Systems Based on Residence Time Distribution Curves, Environ. Sci. Technol., 44, 9377–9382.

Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).