Electronic Thesis and Dissertation Repository


Master of Engineering Science


Mechanical and Materials Engineering


Khayat, Roger E.


The flow of a two-dimensional steady wall jet observed in the slot and blade coating processes has been examined theoretically near the channel exit. The Newtonian free surface jet emerges from a channel and deposits onto an infinite moving wall with an adverse or favorable pressure gradient applied inside the channel. The Reynolds number considered is within the moderate range, and fully developed Couette-Poisueille flow conditions are assumed to prevail far upstream inside the channel. The effects of inertia and pressure gradient on the velocity, the shape of the free surface, and the stress are emphasized. It is found that the jet always contracts near the channel exit regardless of the level of inertia and direction of the applied pressure gradient. An adverse pressure gradient provides thinner film thickness than a favorable one.