Fast transport with wall slippage

IF 0.8 4区工程技术 Q4 ENGINEERING, CHEMICAL

Membrane Water Treatment Pub Date : 2021-01-01 DOI:10.12989/MWT.2021.12.1.037

Zhipeng Tang, Yongbin Zhang

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Abstract

This paper presents the multiscale calculation results of the very fast volume transport in micro/nano cylindrical tubes with the wall slippage. There simultaneously occurs the adsorbed layer flow and the intermediate continuum fluid flow which are respectively on different scales. The modeled fluid is water and the tube wall is somewhat hydrophobic. The calculation shows that the power loss on the tube no more than 1.0 Watt/m can generate the wall slippage even if the fluid-tube wall interfacial shear strength is 1 MPa; The power loss on the scale 104 Watt/m produces the volume flow rate through the tube more than one hundred times higher than the classical hydrodynamic theory calculation even if the fluid-tube wall interfacial shear strength is 1 MPa. When the wall slippage occurs, the volume flow rate through the tube is in direct proportion to the power loss on the tube but in inverse proportion to the fluid-tube wall interfacial shear strength. For low interfacial shear strengths such as no more than 1 kPa, the transport in the tube appears very fast with the magnitude more than 4 orders higher than the classical calculation if the power loss on the tube is on the scale 104 Watt/m.

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快速输送与壁滑移

本文给出了考虑壁面滑移的微纳圆柱管内快速体积输运的多尺度计算结果。同时存在不同尺度的吸附层流动和中间连续流体流动。模拟的流体是水，管壁有点疏水。计算表明，当流体-管壁界面抗剪强度为1 MPa时，管壁上功率损失不大于1.0 w /m即可产生管壁滑移;在功率损失为104瓦特/米的情况下，即使流体-管壁界面抗剪强度为1 MPa，通过管道的体积流量也比经典流体力学理论计算高出100倍以上。当管壁发生滑移时，管道的体积流量与管道上的功率损失成正比，而与流体-管壁界面剪切强度成反比。当界面剪切强度较低，如不大于1kpa时，管内输运速度非常快，功率损失为104瓦/米时，输运量比经典计算值高出4个数量级以上。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Membrane Water Treatment ENGINEERING, CHEMICAL-WATER RESOURCES

CiteScore

1.90

自引率

30.00%

发文量

审稿时长

>12 weeks

期刊介绍： The Membrane and Water Treatment(MWT), An International Journal, aims at opening an access to the valuable source of technical information and providing an excellent publication channel for the global community of researchers in Membrane and Water Treatment related area. Specific emphasis of the journal may include but not limited to; the engineering and scientific aspects of understanding the basic mechanisms and applying membranes for water and waste water treatment, such as transport phenomena, surface characteristics, fouling, scaling, desalination, membrane bioreactors, water reuse, and system optimization.