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    Compressible vs incompressible flow

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    m9 Compressible vs incompressible flow

    مُساهمة من طرف teacher في الخميس 08 مايو 2008, 4:57 pm


    Compressible vs incompressible flow


    lol!

    All fluids are compressible to some extent, that is changes in pressure or temperature will result in changes in density. However, in many situations the changes in pressure and temperature are sufficiently small that the changes in density are negligible. In this case the flow can be modeled as an incompressible flow. Otherwise the more general compressible flow equations must be used.
    Mathematically, incompressibility is expressed by saying that the density ρ of a fluid parcel does not change as it moves in the flow field, i.e.,



    where D / Dt is the substantial derivative, which is the sum of local and convective derivatives. This additional constraint simplifies the governing equations, especially in the case when the fluid has a uniform density.
    For flow of gases, to determine whether to use compressible or incompressible fluid dynamics, the Mach number of the flow is to be evaluated. As a rough guide, compressible effects can be ignored at Mach numbers below approximately 0.3. For liquids, whether the incompressible assumption is valid depends on the fluid properties (specifically the critical pressure and temperature of the fluid) and the flow conditions (how close to the critical pressure the actual flow pressure becomes). Acoustic problems always require allowing compressibility, since sound waves are compression waves involving changes in pressure and density of the medium through wthey propagate.hich


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    mezooo125
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    m9 رد: Compressible vs incompressible flow

    مُساهمة من طرف mezooo125 في الجمعة 09 مايو 2008, 1:20 am

    thanksssssssssss cheers


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    Asmaa Mahmoud
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    m9 رد: Compressible vs incompressible flow

    مُساهمة من طرف Asmaa Mahmoud في الجمعة 09 مايو 2008, 11:53 pm

    u r love dr/moh. fahmy and love all aplied math.


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