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CFD中文网

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  3. Fluent 材料面板中关于物质焓值的设置

Fluent 材料面板中关于物质焓值的设置

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  • Q Offline
    Q Offline
    qhwj1990
    wrote on last edited by
    #1

    在帮助手册中,Fluent材料面板中的焓值为标准生成焓,在相变计算中为啥大多数人,直接设置液态的焓值为0,气体的焓值为对应的潜热?

    Q 1 Reply Last reply
  • Q Offline
    Q Offline
    qhwj1990
    replied to qhwj1990 on last edited by
    #2

    @qhwj1990 另外在Fluent的练习中还看到了一段这样的解释,让我越看越困惑,请大家来讨论一下。替代文字

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  • Q Offline
    Q Offline
    qhwj1990
    wrote on last edited by
    #3

    @qhwj19901.png

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  • 黄 Offline
    黄 Offline
    黄昏晓为谁破
    wrote on last edited by
    #4

    发生相变的话,主要的量就是潜热,跟物质本身的标准状态焓无关,但是跟相变的焓差有关,也就是潜热了,所以液相为0,气相设置的大一点,但是焓差也不是代表潜热值,也就是后面红线的那段话了,其实就是单位的问题,这个焓值除摩尔质量,不就是潜热的单位么,以上就是我的理解了。

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  • Q Offline
    Q Offline
    qhwj1990
    replied to 黄昏晓为谁破 on last edited by
    #5

    @黄昏晓为谁破 2019-10-30_211938.png 如图,水(液态)的标准摩尔生成焓是-285.83kj/mol,水(气态)的标准摩尔生成焓是-241.825kj/mol,对照软件数据库,是水的为-2.858412e+08 j/kgmol,气态的为-2.418379e+08 j/kgmol, 那是不是可以说他们之间可以按E+6倍换算呢?

    黄 1 Reply Last reply
  • 黄 Offline
    黄 Offline
    黄昏晓为谁破
    replied to qhwj1990 on last edited by
    #6

    @qhwj1990 这几个数值就是单位的差别把,kj=1000j, kgmol=1000mol

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