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漿液流體的黏滯性與流速的關(guān)系
流體內(nèi)部質(zhì)點(diǎn)間或流層間因相對(duì)運(yùn)動(dòng)面產(chǎn)生內(nèi)摩擦力(內(nèi)力)以反抗相對(duì)運(yùn)動(dòng)的性質(zhì)，稱(chēng)為黏滯性。此內(nèi)摩擦力稱(chēng)為黏滯力。表示流體黏滯性程度大小的量，是動(dòng)力黏性系數(shù)u和運(yùn)動(dòng)黏性系數(shù)v。
1.動(dòng)力黏性系數(shù)u
表征流體內(nèi)摩擦力與流體性質(zhì)有關(guān)的系數(shù)，稱(chēng)動(dòng)力黏性系數(shù)或稱(chēng)動(dòng)力黏度，簡(jiǎn)稱(chēng)黏度。它與流體的種類(lèi)有關(guān)。μ值愈大，表示流體的黏滯性(黏度)愈大。同一類(lèi)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(yùn)動(dòng)黏性系數(shù)v
流體動(dòng)力黏性系效μ與密度p的比值v稱(chēng)流體運(yùn)動(dòng)黏性系數(shù)或稱(chēng)運(yùn)動(dòng)黏度，工程計(jì)算中常用到運(yùn)動(dòng)黏性系數(shù)。
V=μ/p
v的單位斯托克斯(St)或稱(chēng)斯。1St=1cm2/s。
表1-1、表1-2中表示了水在不同溫度下的運(yùn)動(dòng)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
