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漿液流體的黏滯性與流速的關系

流體內(nèi)部質(zhì)點間或流層間因相對運動面產(chǎn)生內(nèi)摩擦力(內(nèi)力)以反抗相對運動的性質(zhì)，稱為黏滯性。此內(nèi)摩擦力稱為黏滯力。表示流體黏滯性程度大小的量，是動力黏性系數(shù)u和運動黏性系數(shù)v。
1.動力黏性系數(shù)u
    表征流體內(nèi)摩擦力與流體性質(zhì)有關的系數(shù)，稱動力黏性系數(shù)或稱動力黏度，簡稱黏度。它與流體的種類有關。μ值愈大，表示流體的黏滯性(黏度)愈大。同一類流體的μ值隨溫變的變化而變化，隨著液體的溫度升高μ值降低。
    μ的單位泊(P)，1泊=10-1Pa·s。

2.運動黏性系數(shù)v

流體動力黏性系效μ與密度p的比值v稱流體運動黏性系數(shù)或稱運動黏度，工程計算中常用到運動黏性系數(shù)。

V=μ/p

v的單位斯托克斯(St)或稱斯。1St=1cm2/s。
表1-1、表1-2中表示了水在不同溫度下的運動就性系數(shù)v的值。 渣漿泵

Relationship between viscosity and velocity of slurry fluid

The internal friction (internal force) between particles or flow layers in a fluid due to the relative motion surface to resist the relative motion is called viscosity. This internal friction is called viscous force. The quantity indicating the degree of fluid viscosity is the dynamic viscosity coefficient u and the kinematic viscosity coefficient v.

1. Dynamic viscosity coefficient u

The coefficient that characterizes the internal friction of fluid and its properties is called dynamic viscosity coefficient or dynamic viscosity. It is related to the type of fluid. The higher the μ value, the greater the viscosity of the fluid. The μ value of the same kind of fluid changes with the change of temperature, and decreases with the increase of temperature.

μ unit poise (P), 1 poise = 10-1pa · s.

2. Kinematic viscosity coefficient V

The ratio of the viscosity coefficient μ to the density p V is called the viscosity coefficient of fluid motion or kinematic viscosity, which is often used in engineering calculation.

V= mu /p

The unit of V is ST or S. 1St=1cm2/s。

Table 1-1 and table 1-2 show the value of mobility coefficient V of water at different temperatures Slurry pump