標題: 水阻 / flow rate 跟氣泡的關係 [打印本頁]

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作者: amoslee    時間: 2009-6-27 00:53     標題: 水阻 / flow rate 跟氣泡的關係

開過新thread討論好D...
flow rate、水箱、水阻....等都會對bubble有所影響...
請指教1下：
唔知C Hing你們應為會唔會因為條loop多block / rad / 轉彎而令水阻大 -> flow rate低，所以bubble少...
我有條loop，1個ddc+1體化top+水箱直出CPU block + BI GTX240，(4分喉，90度轉彎位都無) 無事；
另1部機同1loop法 (但3分喉，XSPC360排)，D泡多到飛起，D泡loop番入水箱打起晒D泡又入番條loop ...我懷疑條loop水阻太低Flow rate太大->多bubble？

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作者: hamsterspeed    時間: 2009-6-27 01:06

問題好多時係出係個res度
因為如果個in/out太近 而flow rate過大
d泡未散到就已經比inlet 抽返入條loop度

但係你個case 用ddc res 所以應該唔關 in/out太近事
你可以先試下加多d coolant去個res度 過80%
如果情況都係一樣 我諗係你個res 設計上有問題多... 用t-line 算...
因為一個正常嘅ddc res top 唔應該有lee個情況出現

[ 本帖最後由 hamsterspeed 於 2009-6-27 01:08 編輯 ]

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作者: amoslee    時間: 2009-6-27 01:12


我都係諗個res...我試過加coolant到99%都唔得，因為好多時冷排 (尤其是大的冷排)都會唔多唔少trap住咗D空氣，當個泵開時便會帶動D trap住咗的氣去到個res，於是又1樣打起晒D泡再由In-take入番條loop...

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作者: kkepic    時間: 2009-6-27 01:13

水流太快真係會令一體化DDC出現咁既情況,
所以d人先會加新化綿作援衝用.


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作者: amoslee    時間: 2009-6-27 01:17

我的例子中2條loop，2款泵都是1樣的，
但1個得1個唔得，(可能)唔關個res事，因2條loop唯1不同的地方就只有喉size及rad (唔同水阻)，故小弟才問這個水阻 <->氣泡的關係。

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作者: hamsterspeed    時間: 2009-6-27 01:21

請問你用邊隻res top?

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作者: amoslee    時間: 2009-6-27 01:22


Thank you C Hing，
其實我都有生化綿，但就無加落去個res到，因為我以為，加咗綿的目的係=加大水阻=減低flow rate？
我正確嗎？
所以，如果我要達到這個目的，我又可以加block、加排姐，無咁"浪費"個泵力嘛，
我正確嗎？請指教！

[ 本帖最後由 amoslee 於 2009-6-27 01:26 編輯 ]

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作者: amoslee    時間: 2009-6-27 01:25


OCXX 1體化 DDC + top + res (有2個)，壞處是個res太細及短身，可以說是1個不太好的設計。
但問題是用同1款泵1個得1個唔得嘛...

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作者: hamsterspeed    時間: 2009-6-27 01:39



我冇用過佢lee隻top 不過我好覺得有d其怪 你條loop唯一係tube size同RAD 唔同冇理由分別咁大下

另外舊生化綿主要用黎隔住outlet d 水等佢唔會撞返D泡入in take度

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作者: CWPP    時間: 2009-6-27 01:46



Yes amoslee, sorry I was away.

Yes, your concept is right.
But, if I were you, I would simply apply the foam in the res to eliminate the bubbles.

Because, if the res design really has problem, it still can create bubbles easily even under slow flow rate. Do you remember how child blow bubbles with soap water by adequate tools? It reflects bubbles can also be created by certain shape/form of obstacle easily ...and even slowly. And in order to solve your problem, by inserting the foam in the res will be the most effective no matter where or which the problem is, simply fast flow rate or else....

[ 本帖最後由 CWPP 於 2009-6-27 03:06 編輯 ]

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作者: amoslee    時間: 2009-6-27 01:49


但我個case就真係咁
唔知會唔會因為條loop少野所以分別更加明顯呢


其中亦會大大減低flow rate...

Anyway，C Hing認為我應怎樣做呢？唔該！

[ 本帖最後由 amoslee 於 2009-6-27 02:00 編輯 ]

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作者: amoslee    時間: 2009-6-27 01:54



Thank you very much for your advise!

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作者: hamsterspeed    時間: 2009-6-27 02:10



我會張舊生化綿放係靠outlet果個位置
你主要係用佢黎分隔開outlet 同in take 好似一幅牆咁
咁D水係outlet出黎就唔會"撞"落起更多泡

而舊綿唔駛放到落底 咁就唔會影響flow rate

** sorry 我可能up 得有少少唔清楚 outlet 係指loop outlet / in take 係指水入impeller

[ 本帖最後由 hamsterspeed 於 2009-6-27 02:24 編輯 ]

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作者: hamsterspeed    時間: 2009-6-27 02:13



didnt notice that circluar shape could create bubbles, learn something new today

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作者: kkepic    時間: 2009-6-27 02:20

其實ddc個一體化水箱個設計係有問題,
水流在水箱內互相撞擊令到水裏的空氣給搞起,
就算把水加滿都冇用,
(情況就像在電視裏看到潛水艇在水裏行走時
螺旋槳搞起水裏的空氣一樣)
生化綿不須塞滿水箱,只要放在你認為可以令它
不會搞起的位置就可以了,
以前見過有位師兄在水箱內加管道來防止搞泡,
都能做到相同成效.

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作者: CWPP    時間: 2009-6-27 02:26



kaka....certain shape/form should be... Typo error corrected.
iirc not just circular shape can trigger bubbles, there are some others. This is part of fluid mechanics and relates to liquid cohesion, which most design/predicted result can only be ascertained by actual testing or simulation but not solely from mathematical formula.

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作者: hamsterspeed    時間: 2009-6-27 02:35

ummm let say we got a deep res top (like XSPC)  would it be wise to fill in as much coolant as possible? because you could reduce the momentum of the outlet water from the loop, hence less bubble created from the splash

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作者: CWPP    時間: 2009-6-27 02:47



ya, I would think so, if there is no other issue.

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作者: amoslee    時間: 2009-6-27 08:34


嘩！原來喱D野都有咁深的研究！
我真係覺得原來自己只係好似玩緊泥沙...

唔該晒各C Hing

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作者: amoslee    時間: 2009-6-27 08:42


I think it depends on the res itself. Just like my 自制大水塘水箱，since it is big enough, I filled the coolant level to "just" above the in take and out let location, no bubble formed.
(as you can see from last little report of comparing 2 enzotach blocks.)
Actually, the made of this res is to easily set up loops in a very convenience way, and avoid the bubble problem!

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作者: hamsterspeed    時間: 2009-6-27 10:15



ya thats ture,
if the res itself is well designed it shouldn't form extra bubbles into the loop.
Just like your tailor made res, the in-take and outlet is far apart to avoid sucking bubbles back into loop
and since the in/outlet align horizontally there is no pt to fill more fluid into the res.

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作者: CWPP    時間: 2009-6-27 15:13

also look at another useful interpretation by kkepic above #15, it means the same thing.
iirc, the Moderator here, Tony, also has practical experience on fluid mechanics.

Fluid mechanics is not my major, but in my opinion, a good res design (high flow with minimal bubbles/minimal energy wastage) is closely related to fluid mechanics. As far as I know, it is a topic difficult to ascertain the design result adequacy/efficiency simply by words or formula in advance, but only through practical test(s) on prototype or computer simulation can bear with a successful outcome......um....similar to fan blade design (effective airflow manipulation).

[ 本帖最後由 CWPP 於 2009-6-27 18:46 編輯 ]

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作者: CWPP    時間: 2009-6-27 15:31



sorry, allow me to clarify, bigger reservoir can not necessarily avoid bubbles, bubbles can also be restricted under small water volume (like the volume scale inside water blocks). Thats why I used the words 'form and shape' of the obstacle instead (physical surface/area factor), and it requires to compromise with its target content - liquid (water) coherence, power/flow and pressure factors (energy factor). Volume is not that much matter in this case.

[ 本帖最後由 CWPP 於 2009-6-28 04:17 編輯 ]

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作者: dannyctl    時間: 2009-6-27 15:56

楼主嘅問題, 開始玩水嗰時我都有, 分别係用ddc 18w, 同ek top連一體化水樽, 3分喉

loop 1 : ddc > 360排 > cpu > nb > 樽 = 1粒泡都冇
loop 2 : ddc > 140排 > display > 樽 = 打到水樽好似水滾咁, 每條喉都見到好多泡運行

初頭以為有地方收唔緊, 或有死位有氣, 搞咗幾個鐘..... 諗起先之前睇過同類型嘅個案,
結果加舊綿搞掂晒...


我只係玩過一套水冷, 經驗少, 都好想揾出問題所在.... 終合各位嘅討論...
我"暫時"會認為係水樽設計有關佔多

因為個樽去水位响呢度

我放綿嗰邊, 樽底係密封嘅, 唯一嘅去水位就比塊膠片分格開, D水到樽, 差不多係馬上就有
水流要即刻抽走, 好似 "hamsterspeed ching ' 講嘅一樣! 水力大猛, 打起有泡,但係又唔夠
時間往上排走... 已經又被抽走.... 死得

唔知我諗得啱唔啱呢? 又有冇更好嘅方法解决呢! 請指教吓

[ 本帖最後由 dannyctl 於 2009-6-27 23:04 編輯 ]

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作者: iloveskyline    時間: 2009-6-27 20:10

試下放舊綿係水面

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作者: dannyctl    時間: 2009-6-27 21:00



而家放响樽下面, 係1粒泡都冇架........點解要放水面呢?(唔好睇wor!)  請指教吓

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作者: amoslee    時間: 2009-6-28 00:11


我都有放生化綿以解決氣泡問題，但想更清楚了解水流速度、水阻、水箱設計...等關係，故出帖討論。估唔到背後真係有咁多學問！
喱到D C Hing真係好勁！！！

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作者: dannyctl    時間: 2009-6-28 00:37



我以前聽先水冷, 只會諗起... "會唔會漏水架!?"
呢喥係個好地方, 高手可以温故知新. 新手可以學到好多嘢 (我都係其中之一, 須然我整得唔太好 )
只要抱住討論, 觀摩嘅態度, D時間都會消磨得開心D啦
我都要再好好諗吓點搞好D倏水道先
各位c hing多多包函

[ 本帖最後由 dannyctl 於 2009-6-28 00:39 編輯 ]

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作者: iloveskyline    時間: 2009-6-28 04:12


睇黎我誤會左你個水樽ge設計
我個方法應該唔適用你個水樽

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作者: dannyctl    時間: 2009-6-28 13:32



請問c hing用邊隻樽呀

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作者: iloveskyline    時間: 2009-6-28 18:26


水樽inlet同outlet同一方向(水平)