Fluid Mechanics and Hydraulic Systems

Manual: General · Subject: Engineering

Understand how liquids and gases flow, how pressure acts, and why fluids are essential to pumps, pipes, and machines.

Pressure and flow

Pressure in fluids

Pressure is force per unit area, $P = \frac{F}{A}$ . In static fluids, pressure increases with depth approximately as $P = P_0 + \rho gh$ , where $\rho$ is density, $g$ is gravitational acceleration, and $h$ is depth.

Flow behavior

Flow rate is the volume of fluid moving per unit time. Engineers use continuity, pressure drop, viscosity, and energy loss concepts to design pipes, valves, pumps, and aerodynamic surfaces.

Hydraulic principles

Pascal's principle

Pressure applied to a confined fluid is transmitted throughout the fluid

Viscosity

Internal resistance to flow

Bernoulli idea

Energy exchange between pressure, speed, and elevation in flowing fluid

Reynolds number

A dimensionless indicator of flow regime

ℹ️

Hydraulics multiply force

A hydraulic system can produce large output force using a smaller input force because pressure is transmitted through the fluid.

Hydraulic system design steps

1

Step 1: Define required force, speed, and stroke.
2

Step 2: Select fluid and estimate operating pressure.
3

Step 3: Size cylinders, hoses, and valves.
4

Step 4: Estimate losses and heating.
5

Step 5: Check safety, leakage, and maintenance needs.

Which equation describes pressure due to fluid depth?

P = P_0 + \rho gh

P = IR

P = ma

P = \frac{1}{2}mv^2

What fluid property describes resistance to flow?

What is one major benefit of hydraulic systems?

They can transmit large forces compactly They never leak They work only in vacuum They eliminate friction

Neuroanatomy Explorer

Memory Deck

Match the Pairs

Concept Constellation

Fluid Mechanics and Hydraulic Systems

Pressure and flow

Pressure in fluids

Flow behavior

Hydraulic system design steps