Under what conditions will Pathlines streamlines and Streaklines be considered the same?
Streamlines, streaklines and pathlines are field lines in a fluid flow. They differ only when the flow changes with time, that is, when the flow is not steady.
Can two streamlines cross each other?
Two streamlines cannot cross each other, because there will be two velocities at the point of intersection, which is not possible.
What will happen if two streamlines intersect?
If the two streamlines intersect each other, it signifies two direction of velocity which cannot be possible. Thus, two streamlines cannot intersect each other.
Why is there no flow across streamlines?
A streamline is a line that is tangential to the instantaneous velocity direction (velocity is a vector, and it has a magnitude and a direction). Since the velocity at any point in the flow has a single value (the flow cannot go in more than one direction at the same time), streamlines cannot cross.
Can the flow inside a nozzle be steady and uniform?
Can the flow inside a nozzle be steady and uniform? Explanation: According to the continuity equation, ρAV =constant, where ρ= density, A= cross-sectional area of flow, V = velocity of flow. For a nozzle, the area gradually decreases towards it’s exit. Hence, it’ll always be an unsteady flow.
Can two streamlines intersect and why?
Answer. Two streamlines cannot cross each other, because there will be two velocities at the point of intersection, which is not possible.
How can we determine whether the flow is laminar or turbulent?
For practical purposes, if the Reynolds number is less than 2000, the flow is laminar. If it is greater than 3500, the flow is turbulent. Flows with Reynolds numbers between 2000 and 3500 are sometimes referred to as transitional flows.
What is critical velocity?
: the greatest velocity with which a fluid can flow through a given conduit without becoming turbulent.
What is the difference between critical velocity and terminal velocity?
Terminal velocity and critical velocity are not same. Critical velocity is the velocity below which the flow of liquid is streamline.
What is critical velocity Reynolds number?
Critical velocity is the speed and direction at which the flow of a liquid through a tube changes from smooth to turbulent. Determining the critical velocity depends on multiple variables, but it is the Reynolds number that characterises the flow of the liquid through a tube as either turbulent or laminar.
What is the fastest anything can fall to earth?
Near the surface of the Earth, an object in free fall in a vacuum will accelerate at approximately 9.8 m/s2, independent of its mass. With air resistance acting on an object that has been dropped, the object will eventually reach a terminal velocity, which is around 53 m/s (190 km/h or 118 mph) for a human skydiver.
Which falls faster a brick or a feather?
Galileo discovered that objects that are more dense, or have more mass, fall at a faster rate than less dense objects, due to this air resistance. A feather and brick dropped together. Air resistance causes the feather to fall more slowly.
Do heavy things fall faster?
At what speed will hitting water kill you?
You’d be traveling around 130-150 mph. That water would be about as soft as hitting a pile of sand. At 1000, feet, you’d be dead.
Do you die before hitting the floor?
There’s a fairly common belief that if you happen to fall from a great height, you’ll be “dead before you hit the ground”. The reality is that it’s the huge deceleration (as you suddenly stop) that kills you. It’s really hard to die while you are in “free fall”, ie, falling freely through the atmosphere.
Can you survive a 50 foot fall?
Since evaluations began in the 1940s and more extensively in the 1980s through 2005, the fall height at which 50% of patients are expected to die (LD50) has been consistently estimated to be 40ft (12.1m) and historical reports suggest no patients were able to survive a fall greater than 50 ft (15.2 m).
At what height is a fall considered severe?
The anecdotal threshold for sustaining critical injuries from a vertical fall has been defined by the American College of Surgeons’ Committee on Trauma (ACS-COT) at >20 feet (6 meters) [3]. This threshold is corroborated by the published literature on survivors from accidental and suicidal free falls [1].
Can a squirrel survive a 200 ft drop?
Terminal velocity is the fastest that an object will ever fall, no matter what height it is dropped from. Squirrels (unlike most other mammals) can survive impacts at their terminal velocity. Which means no matter what height you drop a squirrel from, it will probably survive.
What is the highest someone has fallen and lived?
Vesna Vulović
Can you survive a 1000 foot fall into water?
If the thousand foot fall was terminated by a body of water, you would die just as quickly as if you had hit a solid object. If the thousand foot fall was from, for example, 10,000 feet to 9,000 feet of altitude and you had a parachute, you would likely live.
Can you survive a 300 foot fall?
People usually survive falls from a height of 20-25 feet (6-8 meters), but above that, things get very deadly very fast. The woman took the lead on the final pitch of a 300-foot (90-meter) climb.
Is Vesna Vulovic still alive?
Deceased (1950–2016)
Do you feel pain in a plane crash?
Death in a high-impact plane crash is usually pretty quick and painless.
When did Vesna Vulovic die?
Dece
Can you survive a 20 foot fall?
Falls from more than 20 feet usually result in a trip to the emergency room, but even low-level falls can cause serious head injuries, according to the American College of Surgeons. This means that 50% of patients who fall four stories will die.