On pipe diameter effects in surfactant drag-reducing pipe flows

Drag reduction and degradation of nonionic surfactant solutions with organic acid in turbulent pipe flow

“…Now, it is successfully in practical use in district heating and cooling systems [40,20]. Regarding the drag reduction of cationic surfactant solutions, the rheological properties [29], the effect of molar ratio of counterion [22,21,38], the diameter effect [37,11], the heat transfer reduction [1,28,32,33], the degradation by age [24,23], the very dilute drag reduction [14], and the high-shear drag reduction [36] have been well investigated so far.…”

Effect of a shear-thickening rheological behaviour on the friction coefficient in a plane channel flow: A study by Direct Numerical Simulation

“…In this work, we refer to the data reported by Usui et al [14] on the system made of Ethoquad O/12 (Oreyl-bishydroxyethyl-methyl-ammonium chloride concentrated at 500 ppm) as a surfactant in water. The flow curve of Fig.…”

Influence of surfactant on friction pressure drop in a manifold microchannel

“…Li et al [7] found that there are an upper critical temperature and a Reynolds number beyond which the DR surfactant has no effect on the flow and the heat transfer is deteriorated. Usui et al [8] developed a scale law by introducing the turbulence model for the Drag Reduction flow, which could estimate the pipe diameter effect with the diameter ranging from 11 to 150 mm. Suksamranchit et al [9] studied the turbulent DR flow by shearing the two opposite plates.…”