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  3. DPM计算纳米流体换热,换热没有提升?

DPM计算纳米流体换热,换热没有提升?

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  • Y Offline
    Y Offline
    yishanbb2018
    wrote on last edited by
    #1

    用DPM计算纳米流体换热,但是计算出来的换热系数几乎没有提升,请问有做过这方面的CFDer吗? 能否指导下。 设置如下:21976cf8-ec31-42fa-ba80-4ee1b269e097-image.png
    2db34f88-5f0b-410c-9967-a6730b65c0b5-image.png
    8f4f3027-b01a-42dc-aff5-82b29f126870-image.png
    9ae73be2-8b6b-4139-bb9a-0c4cbaba81fb-image.png

    1 Reply Last reply
  • L Offline
    L Offline
    l.j刘侃
    wrote on last edited by
    #2

    换热根据经验公式得出体积分数相关的纳米流体导入率影响 再通过求解particle in cell 计算体积分数 再编UDF吧

    Y 1 Reply Last reply
  • Y Offline
    Y Offline
    yishanbb2018
    replied to l.j刘侃 on last edited by
    #3

    @l-j刘侃 在 DPM计算纳米流体换热,换热没有提升? 中说:

    particle in cell

    大神,没明白,能否稍微详细解释一下?
    UDF具体写什么内容?
    为什么要先用经验公式算出混合液的有效热导率?

    Y 1 Reply Last reply
  • Y Offline
    Y Offline
    yishanbb2018
    replied to yishanbb2018 on last edited by
    #4

    @yishanbb2018

    就是UDF负责哪方面? 哪方面的内容,是输入质量流量还是什么

    1 Reply Last reply
  • L Offline
    L Offline
    l.j刘侃
    wrote on last edited by
    #5

    CFD models comparative study on nanofluids subcooled flow boiling in a vertical pipe
    你看看这篇文章 然后你看看他对于纳米部分的经验化就了解了

    1 Reply Last reply
  • lcchaosL Offline
    lcchaosL Offline
    lcchaos
    wrote on last edited by
    #6

    如果流动剪切率不大,同时颗粒跟随性比较好,其实可以不用选中saffman lift。

    1 Reply Last reply

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