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UNIT 5- TAE
FLUID DYNAMICS
| Question | Answer |
|---|---|
| What is diffusion? | It is the random walk produced by molecules when they collide betwen each other, changing its velocity. It ocurs in gases and liquids. Molecules collide due to its kinetic energy (internal energy) therefore the speed diffusion depends on the temperature. |
| Pressure gradient? | The change of pressure per unit depth |
| What are manometers used for? | They are devices provided by two columns of a suitable liquid that measure the pressure difference betwen two points. They meassure static pressure, as the fluid travels parallel to the conduct and the manometer are perpendicular to the walls. |
| Venturi anomometers | Where used in early aviation to measure flow velocity due to difference in pressure |
| What is the venturi effect? | It is a phenomenon cause when we are dealing with a flow, that moves thorugh different cross-sectional areas. At first there are more collisions increasing the pressure, as they collide they start to be more ordered, decreasing pressure and increasing v |
| Bernoulli equation | In an incompressible fluid, frictionless and on a streamline. It can be applied the conservation of energy and the continiuty equation, with constant density. As the fluid moves through the conduct exchanges its kinetic energy, into potential or internal |
| What is dynamic pressure | Is the pressure caused by a moving object through the air in the opposite direction of the trajectory. It depends on the density of the air and the speed of the aircraft. |
| Pressure coeficient | Represents the local pressure in a flow field. When it is equal to zero, this means that there are no changes in the fluid velocity. When it is equal to 1, velocity is zero (stagnation point) and when it is less than 0 (suction) . |
| What is a stagnation point ? | A point in the flow, were the velocity is zero and the static pressure its at its maximum value. |
| What is pitot tube? | It consists of a small tube that measure the static pressure with its original h and later on it mesures the total pressure. Measuring the impact pressure that cames from the kinetic energy at the stagnation point. |
| What is diffusion? | It is the random walk produced by molecules when they collide betwen each other, changing its velocity. It ocurs in gases and liquids. Molecules collide due to its kinetic energy (internal energy) therefore the speed diffusion depends on the temperature. |
| Pressure gradient? | The change of pressure per unit depth |
| What are manometers used for? | They are devices provided by two columns of a suitable liquid that measure the pressure difference betwen two points. They meassure static pressure, as the fluid travels parallel to the conduct and the manometer are perpendicular to the walls. |
| Venturi anomometers | Where used in early aviation to measure flow velocity due to difference in pressure |
| What is the venturi effect? | It is a phenomenon cause when we are dealing with a flow, that moves thorugh different cross-sectional areas. At first there are more collisions increasing the pressure, as they collide they start to be more ordered, decreasing pressure and increasing v |
| Bernoulli equation | In an incompressible fluid, frictionless and on a streamline. It can be applied the conservation of energy and the continiuty equation, with constant density. As the fluid moves through the conduct exchanges its kinetic energy, into potential or internal |
| What is dynamic pressure | Is the pressure caused by a moving object through the air in the opposite direction of the trajectory. It depends on the density of the air and the speed of the aircraft. |
| Pressure coeficient | Represents the local pressure in a flow field. When it is equal to zero, this means that there are no changes in the fluid velocity. When it is equal to 1, velocity is zero (stagnation point) and when it is less than 0 (suction) . |
| What is a stagnation point ? | A point in the flow, were the velocity is zero and the static pressure its at its maximum value. |
| What is pitot tube? | It consists of a small tube that measure the static pressure with its original h and later on it mesures the total pressure. By the impact pressure that cames from the kinetic energy at the stagnation point. The static port capture the pressure. |
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