﻿ 渣浆泵水力学与流体力学基础_公司新闻_河北沐阳泵业安徽快3开奖结果

# 安徽快3开奖结果

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ρ=M/V

ρ----流体的密度， kg/m3;
M----流体的质量,kg;

V-----流体的体积,m3

y----流体的重度，N/m3; (工程制kgf/m3 );
G----流体的重量，N (工程制 kgf);

V----流体的体积， m3;

G=Mg

(1-2):               γ=Mg/V=pg

1. 流体的压缩性

2.流体的热胀性

Section I main mechanical properties of fluid

I. density ρ

The mass per unit volume is the density of the fluid, expressed as ρ. See Table 1-1 and table 1-2 for the density of water.

For homogeneous fluid: ρ = m / V

Where ρ - density of fluid, kg / m3;

M - mass of fluid, kg;

II. Severe γ

The weight of a unit volume of fluid is called the gravity of the fluid, expressed in gamma。

For homogeneous fluid: γ = g / V

G - weight of fluid, n (Engineering KGF);

V - volume of fluid, m3;

Density and gravity: because weight is the product of mass and acceleration of gravity, that is:

G=Mg

Substituting formula (1-2): γ = mg / v = PG

Where, G ---- acceleration of gravity, M / S2, g = 9.807m/s2.

For water at about 4 ° C, its density ρ = 1000kg / m3, its gravity γ = 9807n / m3 (Engineering System: 100kgf / m3)。

III。 compressibility and thermal expansion of fluid

1。 Compressibility of fluid

The compressibility of a fluid is the property that the fluid is compressed, the volume is reduced, and the density is increased. The change of fluid with the increase or decrease of pressure is very small, which can be regarded as constant. It is called incompressible fluid, for example, liquid is incompressible fluid. However, the volume and density of gas change significantly with the increase or decrease of pressure, which is called compressible fluid.

2. Thermal expansion of fluid

After the fluid is heated, its volume expands and its density decreases, which is called the thermal expansion of the fluid。