トムズ効果による乱流抵抗低減メカニズムについて : 離散要素モデルに基づく考察(OS.13 溶液・分散系のマイクロ・ナノ構造と流れの相互作用)

概要

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A model to simulate the drag reductoin by dilute addition of polymer or surfactant (Toms effect) is proposed based on the discrete element model. The dimension of the discrete element, which represents the polymer or the rod-like micelle, is very small compared to that of the velocity fluctuation of the fluid. So it is assumed that the element is in equilibrium state in the fluid and turns to the direction of an eigenvector of the velocity gradient tensor. And the macroscopic effect of the discrete elements is modeled as the stress assuming the elements are independent each other. Direct numerical simulations are carried out with this new model using the rigid dumbbell element as a discrete element model and it is shown that the drag reduction up to 37% drag reduction rate is reproduced. The mechanism of the drag reduction is discussed based on the DNS database.
社団法人日本機械学会の論文
2004-03-03