00:01To understand viscous flow, consider the following pipe.
00:06Let's just say that the bottom of the pipe is the x-axis, and the height of the pipe is the y-axis.
00:14Fluid flows from left to right.
00:19Well, this fluid is composed of a number of particles.
00:23Let's assume that this row of particles moves horizontally.
00:31During its movement, this row of particles rubs against other rows of particles.
00:37A row of particles above it, and a row of particles below it,
00:41causes the particle's speed to decrease.
00:45When all rows of particles move, each row of particles will have a different speed.
00:53The row of particles near the surface of the pipe barely moves.
00:58Furthermore, the speed of the row of particles above it moves faster
01:02when compared to the row of particles below it.
01:06So the speed of the fastest row is the row of particles in the middle of the pipe.
01:13Thus, viscous flow is a form of fluid flow due to the friction process
01:18between one fluid layer and another fluid layer.
01:21The measure of friction between layers of fluid is the viscosity value of the fluid.
01:31To describe this movement, we can create a velocity profile.
01:39The higher the viscosity, the higher the friction force between fluid layers.
01:52If a fluid has a viscosity of zero, then each row of particles will have the same speed.
01:59This flow is known as inviscid flow.
02:04In terms of the velocity function, the shape is almost flat.
02:09The velocity of the fluid is the same as the velocity of the particles.
02:13This flow is known as inviscid flow.
02:17In terms of the velocity function, the shape is almost flat.
02:26Yup, hopefully this tutorial can give you an idea of what viscous flow and inviscid flow are.
02:32And don't forget to watch the next video.
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