Aflow of nitrogen n2 at 350k and 200 kpa at a speed of 100 m/s through a channel measuring 10 μm in diameter (the kinematic viscosity of n2 is 1.09 × 10−5 m2 /s, the sound speed is 381 m/s) . use the reynolds number to figure out if the flow is laminar or turbulent and can we use the the continuum theory (i. e. navier stokes equations) to decribe the flow? if yes, explain what type of boundary condition should we use (slip or nonslip).

Different types of steels contain different elements that alter the characteristics of the steel. for each of the following elements, explain what the element does when alloyed with steel.

Ajournal bearing has a journal diameter of 3.250 in with a unilateral tolerance of 20.003 in. the bushing bore has a diameter of 3.256 in and a unilateral tolerance of 0.004 in. the bushing is 2.8 in long and supports a 700-lbf load. the journal speed is 900 rev/min. find the minimum oil film thickness and the maximum film pressure for both sae 20 and sae 20w-30 lubricants, for the tightest assembly if the operating film temperature is 160°f. a computer code is appropriate for solving this problem.

Water at 55c flows across a flat plate whose surface temperature is held constant at 95c. if the temperature gradient at the plate's surface for a given value of x is 18 c/mm, find a) local heat transfer coefficient. b) heat flux