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Напорное ламинарное течение броуновской суспензии в плоском канале

Authors: Ryazhskih, A.V.;

Напорное ламинарное течение броуновской суспензии в плоском канале

Abstract

Александр Викторович Ряжских, кандидат физико-математических наук, доцент, кафедра ≪Прикладная математика и механика≫, Воронежский государственный технический университет (г. Воронеж, Российская Федерация), ryazhskihav@bk.ru. На основе двухжидкостных представлений о гидродинамике гетерогенных сред жидкость (газ) – твердые частицы без фазовых переходов и в отсутствии массовых сил с ньютоновским реологическим законом непрерывных несжимаемых компонент предложена модель напорного ламинарного течения броуновской суспензии, учитывающей давление частиц в уравнении для дисперсионной фазы. Давление частиц оценено через их энергию, затрачиваемой на сохранение стабильности гомогенности суспензии. Процедура линеаризации градиента давления в дисперсной фазе проведена с введением параметра, означающего существование поперечной координаты, в которой скорости фаз равны. Сформулирована и аналитически решена в геометрическом формате 2-D, предполагая однонаправленность течения суспензии в плоском горизонтальном канале, система модельных дифференциальных уравнений с краевыми условиями ≪прилипания≫ фаз к стенкам канала и осевой симметрии поля скоростей. Установлено, что увеличение скорости потока приводит к большему опережению скорости частиц вблизи стенки и к большему отставанию в ядре потока, причем максимальная скорость фаз на оси канала больше скорости жидкости без дисперсионной фазы. Сравнительный анализ результатов расчета коэффициента сопротивления с известными экспериментальными данными подтвердили корректность предложенной модели и подтвердили снижение сопротивления течению броуновских суспензий по сравнению с гомогенной жидкой средой. Based on two-fluid concepts of the hydrodynamics of heterogeneous media, liquid (gas)solid particles without phase transitions and in the absence of mass forces with the Newtonian rheological law of continuous incompressible components, a model of pressure laminar flow of a Brownian suspension is proposed, taking into account the pressure of particles in the equation for the dispersion phase. The pressure of particles is estimated through their energy expended to maintain the stability of the homogeneity of the suspension. The procedure for linearizing the pressure gradient in the dispersed phase was carried out with the introduction of a parameter indicating the existence of a transverse coordinate in which the phase velocities are equal. A system of model differential equations with boundary conditions for “sticking” of phases to the channel walls and axial symmetry of the velocity field is formulated and analytically solved in a 2-D geometric format, assuming unidirectional suspension flow in a flat horizontal channel. It has been established that an increase in the flow velocity leads to a greater advance of the particle velocity near the wall and a greater lag in the flow core, and the maximum phase velocity on the channel axis is greater than the velocity of the liquid without a dispersive phase. A comparative analysis of the results of calculating the resistance coefficient with known experimental data confirmed the correctness of the proposed model and confirmed the decrease in the resistance to flow of Brownian suspensions compared to a homogeneous liquid medium.

Country
Russian Federation
Keywords

laminar flow, УДК 621.1.016.4(03), ламинарное течение, flat channel, phase velocity fields, броуновские суспензии, плоский канал, Brownian suspensions, поля скоростей фаз

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
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Green