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Fluid dynamics is a branch of fluid mechanics that studies the flow of fluid in motion. Fluid dynamics, aerodynamics, and hydrodynamics are only a few of the well-known disciplines of fluid mechanics.
Calculating force and moments, measuring the mass flow rate of petroleum via pipelines, forecasting weather patterns, comprehending nebulae in interstellar space, and modeling fission bomb explosion are only some of the uses.
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Keyterms: Fluid, Motion, Fluid dynamics, aerodynamics, hydrodynamics, Force, Moments, modeling fission, bomb explosion, petroleum, pipelines
Read More: Elastic Limit
What is Fluid flow
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The flow of fluids—liquids and gases—is described by fluid dynamics, a subdiscipline of fluid mechanics. It involves the motion of a fluid exposed to unequal forces. As long as unbalanced pressures are applied, this motion will persist.
When pouring water from a mug, the water velocity is extremely high above the lip, moderately high near the lip, and extremely low at the bottom. The flow continues as long as there is water and the cup is tilted, and gravity is the unbalanced force.
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Types of Fluids
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Fluids are classified as follows:
- The Perfect Fluid
Incompressible, an ideal fluid is a hypothetical fluid that does not exist in reality. It's also devoid of viscosity.
- Plastic Fluid (ideal)
The fluid is considered to be perfect plastic when the shear stress is proportional to the velocity gradient and greater than the yield value.
- Genuine Fluid
Fluids with viscosity are considered genuine fluids.
- Fluid Newtonian
A Newtonian fluid is one that obeys Newton's law of viscosity.
- Fluid that isn't Newtonian
A non-Newtonian fluid is one that defies Newton's viscosity law. Incompressible Fluid is a type of fluid that can't be compressed. Incompressible fluid is defined as one whose density does not change with the application of external force.
- Fluid That Can Be Compressed
It is a compressible fluid when the density of the fluid changes with the application of external force.
Read More: Intermolecular Forces
Flow Stable or Unstable
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Depending on the fluid's velocity, fluid flow can be steady or unsteady
Steady: The velocity of the fluid in a steady fluid flow is constant at all times.
When a flow is unstable, the fluid's velocity might vary significantly between any two sites.
Flow Viscous or Non-viscous
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There are two types of liquid flow: viscous and non-viscous.
Viscosity is a measurement of a fluid's thickness, and viscous fluids are particularly gloppy fluids like motor oil or shampoo.
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Equation
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The pace at which a huge fluid moves across a unit area is known as mass flow rate. To put it another way, it's the movement of mass per unit of time. The mass flow rate formula is as follows:
Massflowrate=ρAV
We can see from the equation that the mass flow rate is affected by the fluid's density, velocity, and cross-sectional area.
Flow classification based on the Mach number
M0.3 denotes incompressible flow.
M in compressible subsonic flow ranges from 0.3 to 1.
Read More: Mean Free Path
Things to Remember
- Cats' saliva contains a lot of liquids.
- Fluid mechanics is the study of how fluids flow and the forces that act on them. There are two types of fluid mechanics: fluid statics and fluid dynamics. Fluid dynamics is the study of fluids in motion, whereas fluid statics is the study of fluids at rest.
- Fluid mechanics is a subset of continuum mechanics, which represents matter without taking into account the atoms that make it up.
- The qualities of a liquid fluid are as follows.
- Except for ice, which expands after cooling, we can compress liquids.
- Water cannot be compressed.
- There are three types of liquids.
- The liquid state of the fluid is required for carbon-based life to exist.
- The majority of the water on the planet comes from space.
- Fluids have a constant volume, which means they stay contained within the vessel they are stored in.
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Sample Questions
Ques: What are the influences on fluid flow? (1 Mark)
Ans: The viscosity of the fluid, its density, and its velocity are all elements that influence fluid flow.
Ques: Give a real-life example of laminar flow. (1 Mark)
Ans: In real life, blood circulation throughout our bodies is an example of laminar flow. Laminar flow may also be seen in the movement of air over an airplane wing.
Ques: State Real-Life Examples of Fluids. (2 Marks)
Ans: A fluid is a continuous, amorphous material whose molecules move freely one after another and tend to take on the shape of the container in which it is contained; it can be either a liquid or a gas. Fluids do not have a permanent resistance to deformation; instead, they can only resist relative rates of deformation in a dissipative or frictional manner. They do, however, have the following applications:
A jam is solid until it is warmed, at which point it melts and becomes fluid. This fluid may be poured over the cake to make it more delectable.
A topping cream transforms into a liquid that may be used to garnish bread and cakes.
Emulsions are fluids, honey.State Real-Life Examples of Fluids.
Ques: What is the definition of viscosity? (1 Mark)
Ans: Viscosity is a fluid quality that causes an internal frictional force to act while the fluid is moving, opposing the relative motion of its distinct layers.
Ques: Bernoulli's theorem conserves what? (1 Mark)
Ans: According to Bernoulli's theorem, the total energy of an incompressible non-viscous liquid (fluid) in a steady flow is constant at all places.
Ques: What causes the viscosity of a fluid? What effect does viscosity have on fluid flow? (1 Mark)
Ans: Internal friction is the cause of fluid viscosity. When viscosity rises, the flow of fluid reduces because viscosity is a frictional force, and the higher the friction, the lower the flow of liquid.
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