The effective diameter in the formula above is often determined experimentally by sieving the particles through a series of progressively finer sieves and then using the expressions in Chapter 11. Suppose we are fluidizing a bed of crushed sub-bituminous coal with gas. Calculate the minimum fluidization velocity assuming the following properties.

Asimple speed reducer is composed of 2 spur gears. the pinion gear has a pitch diameter of 0.75" and 36 teeth while the driven gear has a pitch diameter of 4.0" and 192 teeth. a)-what is the diametral pitch of each gear? b)-if an electric motor rotating ccw at 3000 rpm is coupled to the pinion, what is the rotational speed of the driven gear? c)-if the torque delivered to the pinion is 1 n-m, what is the torque on the driven gear? d)-what is the power transmitted by the gear train?

Different between right hand turning tool and left hand turning tool ?

Derive the 2-d finite difference equation for a uniform grid for a node: a) at a plane surface with a uniform heat flux b) at an internal corner with convection