Boundary Conditions
The appropriate boundary conditions to be applied at the boundary of a ?uid in contact with another
medium depends on the nature of this other medium ? solid, liquid, or gas. We discuss a few of the
more important cases here in turn:
1. At a solid surface: V and T are continuous. Contained in this boundary condition is the ?no-slip?
condition, namely, that the tangential velocity of the ?uid in contact with the boundary of the
solid is equal to that of the boundary. For an inviscid ?uid the no-slip condition does not apply,
and only the normal component of velocity is continuous. If the wall is permeable, the tangential
velocity is continuous and the normal velocity is arbitrary; the temperature boundary condition
for this case depends on the nature of the injection or suction at the wall.
2. At a liquid/gas interface: For such cases the appropriate boundary conditions depend on what
can be assumed about the gas the liquid is in contact with. In the classical liquid free-surface
problem, the gas, generally atmospheric air, can be ignored and the necessary boundary conditions
are that (a) the normal velocity in the liquid at the interface is equal to the normal velocity of the
interface and (b) the pressure in the liquid at the interface exceeds the atmospheric pressure by
an amount equal to
المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .
|