A large planar plate, 4 mm thick, is placed between them at 20C of engine oil.

It is drawn with a constant speed of =5 m/s on a fixed plate.

a) By accepting the velocity profile developing in the oil film as parabolic as drawn in the figure, the upper plate

Determine the shear stress and its direction.

b) What would your answer be if a linear velocity profile were accepted?

Soru 4) Byk bir dzlemsel levha, aralarnda 4 mm kalnlnda 20C scaklkta motor yann bulunduu sabit bir levha zerinde sabit U=5 m/s hzyla ekilmektedir. a) Ya filmi ierisinde gelien hz profilinin ekilde izildii gibi parabolik kabul ederek st levha zerinde oluan kayma gerilmesini ve ynn belirleyiniz. b) Eer lineer bir hz profili kabul edilmi olsayd cevabnz ne olurdu? U = 5 m/s h = 4 mm Motor ya