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Updated: Dec 11, 2025

Analyzing Mixing Inhomogeneity in a Microfluidic Device by Microscale Schlieren Technique
Published on: June 12, 2015
Mixing at double-Tee junctions with unequal pipe sizes in water distribution systems.
Tingchao Yu1, Hongying Qiu1, Jeffrey Yang2
1Department of Civil Engineering, Zhejiang University and Key Laboratory of Drinking Water Safety and Distribution Technology of Zhejiang Province, Hangzhou 310058, China.
This study explores pipe flow mixing in double-Tee junctions, finding that larger diameter ratios enhance mixing. Inlet Reynolds number and connecting pipe length significantly influence solute distribution in water systems.
Area of Science:
- Fluid Dynamics
- Environmental Engineering
- Chemical Engineering
Background:
- Contaminant spread in water distribution systems is influenced by pipe flow mixing.
- Most research focuses on cross junctions, with limited studies on double-Tee junctions of unequal diameters.
Purpose of the Study:
- Investigate solute mixing in double-Tee junctions with unequal pipe diameters.
- Determine the impact of Reynolds number ratios and connecting pipe lengths on mixing efficiency.
Main Methods:
- Experimental investigation of pipe flow mixing in a turbulent regime (Reynolds number 12,500–50,000).
- Varied Reynolds number ratios and connecting pipe lengths to assess mixing.
- Developed two-dimensional isopleth maps for normalized outlet concentrations.
Main Results:
- Dimensionless outlet concentrations depend on the mixing mechanism at the junction interface.
- Larger pipe diameter ratios lead to more complete solute mixing.
- Inlet Reynolds number ratio has a stronger effect on mixing than the outlet ratio.
- Dimensionless connecting pipe length plays a complex role in flow mixing.
Conclusions:
- Junction geometry and flow conditions critically affect solute mixing in double-Tee configurations.
- The findings provide a basis for predicting and managing contaminant transport in water systems.
- Isopleth maps offer a practical tool for calculating mixing outcomes.
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