Calculate the value of mass transfer coefficient and the flux for mass transfer from a sphere of naphthalene to air at 45c and 1 atm abs flowing at a velocity of 0.305 m/s. the diameter of the sphere is 25.4 mm. the diffusivity of naphthalene in air at 45c id 6.92*10^-6 m^2/s. and the vapor prssure of solid naphthalene is 0.555 mmhg.

Which of the following is an easy way to remember the modified “x” tire rotation? a. nondrive wheels straight, cross the drive wheels b. drive wheels straight, cross the nondrive wheels c. drive wheels crossed, nondrive wheels straight d. drive wheels crossed, nondrive wheels crossed

Afour cylinder four-stroke in-line engine has a stroke of 160mm, connecting rod length of 150mm, a reciprocating mass of 3kg and its firing order is 1-3-4-2. the spacing between cylinders is 100mm. i. show that the engine is in balance with regard to the primary inertia forces and primary 3. a and secondary inertia couples. li determine the out of balance secondary inertia force ii. propose ways of balancing this out of balance force and discuss the challenges that will arise

The drive force for diffusion is 7 fick's first law can be used to solve the non-steady state diffusion. a)-true b)-false