Experimental study of the effect of drag reducing agent on pressure drop and thermal efficiency of an air cooler

Peyghambarzadeh, S.M.; Hashemabadi, Seyed Hassan; Saffarian, H.; Shekari, F.

doi:10.1007/s00231-015-1650-z

Cited by 14 publications

(1 citation statement)

References 41 publications

(45 reference statements)

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“…The elastic layer expands with the increase in drag reducer concentration, and the drag reduction rate reaches a maximum value when it extends to the center of the tube axis. This hypothesis can explain the diameter effects, but it does not conform to the basic principle of the continuity of the velocity, and cannot explain the resistance rising when the concentration continues to increase after the drag reduction rate reaches the maximum value [12], nor the phenomenon of the change of thermal conductivity coefficient [13,14]. Therefore, it was gradually replaced by other hypotheses.…”

Section: Effective Slip Hypothesismentioning

confidence: 97%

Research Progress on the Collaborative Drag Reduction Effect of Polymers and Surfactants

Mou

et al. 2020

Materials

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Polymer additives and surfactants as drag reduction agents have been widely used in the field of fluid drag reduction. Polymer additives can reduce drag effectively with only a small amount, but they degrade easily. Surfactants have an anti-degradation ability. This paper categorizes the mechanism of drag reducing agents and the influencing factors of drag reduction characteristics. The factors affecting the degradation of polymer additives and the anti-degradation properties of surfactants are discussed. A mixture of polymer additive and surfactant has the characteristics of high shear resistance, a lower critical micelle concentration (CMC), and a good drag reduction effect at higher Reynolds numbers. Therefore, this paper focuses more on a drag reducing agent mixed with a polymer and a surfactant, including the mechanism model, drag reduction characteristics, and anti-degradation ability.

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Section: Effective Slip Hypothesismentioning

confidence: 97%