Mechanistic study of drag reduction in turbulent pipeline flow over anionic polymer and surfactant mixtures

Synthesis and performance evaluation of a new drag reducer based on acrylamide/12‐allyloxydodecyl acid sodium

“…Both of them exceeded 60%, showing a significant drag reduction behavior. Under the influence of both hydrophobicity and electrostatic repulsion, the interaction between the surface‐active group and acrylamide monomer was enhanced, which can protect the polymer chain from shear degrading to a certain extent to improve the shear degradation resistance and flexural strength of the polymer chain 8,10 …”

“…To study the error propagation due to measurement uncertainties of each parameter, one can take the natural logarithm on both sides of Fanning's friction coefficient Equation ( 6) to obtain differentiation as shown in Equation (8), and each item of Equation ( 8) on the right side is the relative error of individual measurement of each physical quantity. The measurement error propagation coefficients of the pipe diameter and flow are 5 and 2, respectively.…”

“…As the most commonly used drag reducers, drag reduction performance and behavior of the polymer type of drag reducers depend on their molecular weights, aggregation, and chain flexibility 7 . Generally, a linear flexible structure and high molecular weight are needed 8 . High molecular weight linear polymers are used to improve the flow efficiency of viscous fluids.…”

“…7 Generally, a linear flexible structure and high molecular weight are needed. 8 High molecular weight linear polymers are used to improve the flow efficiency of viscous fluids. However, these molecules are susceptible to mechanical degradation, which reduces their performance.…”

Prediction and New Insight for the Drag Reduction of Turbulent Flow with Polymers and Its Degradation Mechanism

“…Flow drag reduction has been of great interest from both science and industry perspectives. Currently, there are several methods to reduce the fluid friction, such as by a superhydrophobic surface or by adding a small number of chemical additives. − In terms of the drag reduction by chemical agents, the polymer is a type of agent that is often employed. Many works focused on this interesting phenomenon, while the mechanism is not yet clear, even though it has been found for 7 decades. , One view to understand the mechanism of drag reduction by polymers is the viscoelasticity of polymer solution …”