(a) both mass and mole balance for elements such as C, H, or O, the generation and consumption are not involve in material balance (i.e. equal zero).
(b) We can apply a balance on a volume when we have ideal mixing occurs and the densities of the streams are the same.
(c) We can inferred the generation and consumption terms from the stoichiometric equations
(d) The accumulation term refers to a change in mass or moles (plus or minus) within the system with respect to time.
(e) Closed system, material neither enters nor leaves the vessel, that is, no material crosses the system boundary
(g) In Steady state problems the values of the variables in the system do not change with time, hence the accumulation term is zero.
The rate of addition is equal to the rate of removal as shown in Figure above.
In put - output + generation - consumption = 0
h) Unsteady state (or transient), problems formulated as differential equations with respect to time. The rate of addition (input) not equal to the rate of withdraw (output
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 .
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