24小时热门版块排行榜    

查看: 2334  |  回复: 18
当前只显示满足指定条件的回帖,点击这里查看本话题的所有回帖

不锈蝙蝠

金虫 (正式写手)

懵懂者

[求助] "mean velocity" and "average velocity"? 已有2人参与

Numerous terminologies containing "velocity" exist in Flow Dynamics/Mechanics, among which, one term seems often so similar to another that I could not understand it accurately enough.
As an example, both "mean velocity (distribution)" and "everage velocity" were used in an english reference I'm reading, but with different symbols.
So my question is: what exactly is the difference between these two term? Does "mean velocity" equals to "time-average velocity", as there is a "distribution" following, while "average velocity" means "section-average velocity" which equals to Q/A?

Notes:
1. You are appreciated to answer this post in English.
2. You are greatly appreciated to point out the language erros in my description above.
回复此楼

» 猜你喜欢

» 本主题相关价值贴推荐,对您同样有帮助:

makefulluseofmylife.
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

liulion2008

木虫 (小有名气)

【答案】应助回帖

So my question is: what exactly is the difference between these two term? Does "mean velocity" equals to "time-average velocity", as there is a "distribution" following, while "average velocity" means "section-average velocity" which equals to Q/A?
我的问题是"mean velocity (distribution)" 和"everage velocity"到底有什么不同。是不是"mean velocity"代表“时间平均速率”,应为后面跟了个"distribution"?而"average velocity"代表"section-average velocity"。到底哪个用Q表示,哪个用A表示,
9楼2013-08-23 11:33:25
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖
查看全部 19 个回答

不锈蝙蝠

金虫 (正式写手)

懵懂者

zhtear99: 回帖置顶 2013-08-23 21:37:25
问题大意:流体动力学中有很多包含“Velocity”的术语,有些相近不易辨别。
最近读文献,同时出现“mean velocity (distribution)”和“average velocity”,且用不同符号表示。
想问一下是否前者是指“时均流速(分布)”而后者则是“断面平均流速”的意思?
makefulluseofmylife.
3楼2013-08-23 10:45:30
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

liulion2008

木虫 (小有名气)

【答案】应助回帖

Numerous terminologies containing "velocity" exist in Flow Dynamics/Mechanics, among which, one term seems often so similar to another that I could not understand it accurately enough.
5楼2013-08-23 11:23:34
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

liulion2008

木虫 (小有名气)

【答案】应助回帖

Numerous terminologies containing "velocity" exist in Flow Dynamics/Mechanics, among which, one term seems often so similar to another that I could not understand it accurately enough. 流体动力学专业名词中有太多词语中使用了“速率”这个词语,这些词语的相似程度比较高,我不能很准确的理解这些词语。
6楼2013-08-23 11:25:41
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖
最具人气热帖推荐 [查看全部] 作者 回/看 最后发表
[找工作] 售SCI一区文章,我:8.O.55.1.O.54,科目齐全,可伽急 +3 EZ67DG6CvcKL 2026-08-31 3/150 2026-08-31 22:23 by o3EMxHUAQDtS
[考博] 售SCI一区T0P文章,我:8O.55.1.O.54,科目全,可伽急 +3 EZ67DG6CvcKL 2026-08-31 3/150 2026-08-31 22:14 by o3EMxHUAQDtS
[考研] 售SCI文章,我:8O.5.5.1O.54,科目全,可十急 +3 EZ67DG6CvcKL 2026-08-31 3/150 2026-08-31 22:12 by o3EMxHUAQDtS
[基金申请] 基金未中,这种答复是模板吗? +6 zhaosm1982 2026-08-27 7/350 2026-08-31 21:18 by qdxxmc
[基金申请] 面上意见出来了 +12 黄鸟于飞Chao 2026-08-29 23/1150 2026-08-31 18:57 by 黄鸟于飞Chao
[基金申请] 能否申诉? +7 echo8914667 2026-08-30 8/400 2026-08-31 17:00 by yihongxu
[基金申请] 29号明天会评吗 +4 笨笨唐 2026-08-28 4/200 2026-08-31 09:30 by huixian257
[基金申请] 为什么到现在没收到通知? +5 tannykie 2026-08-29 5/250 2026-08-30 21:05 by purplejack
[基金申请] 有没有仍没收到信息的 +7 德尚中行 2026-08-27 8/400 2026-08-30 20:52 by purplejack
[基金申请] 我就是申请一个面上项目而已,这评审意见是按照杰青的条件评的吧? +6 gouxfjh 2026-08-28 11/550 2026-08-30 07:57 by gouxfjh
[基金申请] 2026年叶企孙基金 +4 bud_bud 2026-08-27 7/350 2026-08-29 07:23 by foolishmani
[基金申请] 怎么查啊 +6 huang1991js 2026-08-26 6/300 2026-08-28 08:42 by winsaint
[基金申请] 面上合作单位盖章 +5 ssyjh 2026-08-27 5/250 2026-08-27 20:50 by gdfollow
[基金申请] 怎么看青基中了没有啊 +5 叶九微 2026-08-26 5/250 2026-08-27 10:35 by l_zh2008
[基金申请] 为什么 国际(地区)合作与交流项目 没有放榜? 10+3 majunge000 2026-08-26 11/550 2026-08-27 08:42 by 北京莱茵编辑
[基金申请] 为什么国自然不能直接公布 +4 bjdxyxy 2026-08-26 4/200 2026-08-26 13:12 by qingmu1201
[基金申请] 国合里面能看到了 +7 一怀馨秋 2026-08-26 7/350 2026-08-26 11:23 by zhaosm1982
[基金申请] 今天务委会开完了,明天出结果吗 +19 angus9576 2026-08-25 23/1150 2026-08-26 10:03 by zp519
[基金申请] 在坚冰还盖着北海的时候,我看到了怒放的梅花。 (金币+10) +6 ziyangfang 2026-08-25 9/450 2026-08-25 20:26 by huagongfeihu
[基金申请] 某些机构,以效率低为荣,以效率低作为存在感 +9 yuleib84 2026-08-25 10/500 2026-08-25 17:14 by alexon
信息提示
请填处理意见