A viscous fluid is contained between two infinitely long,vertical, concentric cylinders. The outer cylinder has a radius roand rotates with an angular velocity . The inner cylinder is fixedand has a radius ri. Make use of the NavierStokes equations toobtain an exact solution for the velocity distribution in the gap.Assume that the flow in the gap is axisymmetric (neither velocity nor pressure are functions of angular position within the gap) andthat there are no velocity components other than the tangentialcomponent. The only body force is the weight.
Ch2.2 Earth Spins on its Axis Earth rotates at the speed of 1,674km/h Earth rotates in counter clock direction, completing one rotation within 24 hrs. Apparent daily motion Occurs when the earth’s surface, the celestial body and across at the sky. Celestial sphere an imaginary concept made by astronomers, which helps visualize. North Celestial pole (NCP) Located directly at North Pole. 90 degrees away from celestial equator. South Celestial pole (SCP) Located directly at South Pole. Celestial Equator – Located exactly on the Earth’s equator. Latitude Measures the distance of north or south from the equator. Longitude Measures the distance at Greenwich, England, in the direction of east or west. Meridian is an imaginary line that splits the sky into east half and west half. Zenith a line that runs from north point to a south point. Nadir – points directly down towards you. Ecliptic is the path that sun takes besides the celest sphere. Circumpolar – means around the pole, always visible region at the sky. 2.3 Earths average distance from the sun is 1.50×10^8km (known as astronomical unit(AU))\ Ecliptic plane When sun would lie on the celestial equator. Vernal equinox located at the constellation Pisces, occurs during March 20. Equinox equally night everywhere on earth. Means night, day are at the same length. 2.4 New Moon rises at the direction of east, sunrise crosses
