纯被动散热机箱

tommycai 发表于 2017-1-9 18:03
我挺烦伸手的
cnki 热管 老化
sci hub hot leg/heat pipe aging

google 百度 搜不到相关专业文章，只有一些论坛反映了笔记本热管出现过相关情况，但回答的应该也都不是专业人士

ltlt2006 发表于 2017-1-8 23:24
确实是纯热管，只是热管里面的物质和一般热管不一样，另外哪里有说cpu盖子温度比散热片低的？
...

我看了b站视频，里面那个主播自己测得红外图，卡比散热片低。其实我怀疑他测的是透明侧板，没测到卡上

ltlt2006 发表于 2017-1-9 19:14
google 百度 搜不到相关专业文章，只有一些论坛反映了笔记本热管出现过相关情况，但回答的应该也都不是专 ...

你不会是不知道这种文章只应该在知网和SCI上找吧
http://www.cnki.net/KCMS/detail/ ... nlIa1VyektWMTI2SHI=

http://www.cnki.net/kcms/detail/ ... ame=cjfd2006&v=

http://www.cnki.net/KCMS/detail/ ... lBJUjhlWDFMdXhZUzc=

Heat Transfer Characterizations of Heat Pipe in Comparison With Copper PipeChen-Ching Ting, Jing-Nang Lee and Chien-Chih Chen
[size=0.923em][+] Author and Article Information

J. Heat Transfer 131(3), 033109 (Jan 23, 2009) (6 pages)doi:10.1115/1.3056571History: Received June 09, 2008; Revised October 20, 2008; Published January 23, 2009
Passivation and Performance of Inorganic Aqueous Solutions in a Grooved Aluminum Flat Heat PipeMichael J. Stubblebine1 and Ivan Catton
[size=0.923em][+] Author and Article Information

J. Heat Transfer 137(5), 052901 (May 01, 2015) (8 pages)Paper No: HT-14-1119; doi: 10.1115/1.4029694History: Received March 10, 2014; Revised January 27, 2015; Online February 18, 2015

tommycai 发表于 2017-1-10 09:13
你不会是不知道这种文章只应该在知网和SCI上找吧
http://www.cnki.net/KCMS/detail/detail.aspx?QueryID= ...

时间有限，没有很完整的看文章
需要科普的请看 http://heattransfer.asmedigitalc ... 9&resultClick=3

据我所知大尺寸的管道中存在这种现象http://asmedigitalcollection.asm ... 0&resultClick=1
小尺寸管道我确实不太了解，希望有知晓的朋友可以补充

tommycai 发表于 2017-1-9 15:40
没什么黑科技的，上述发言除了引用的专利，毫无价值可言，大部分都是工热传质流体力学都没学过的，讨论什么 ...

Applications[edit]

The first space application occurred aboard a Russian spacecraft in 1989. LHPs are now commonly used in space aboard satellites including; Russian Granat, Obzor spacecraft, Boeing’s (Hughes) HS 702 communication satellites, Chinese FY-1C meteorological satellite, NASA’s ICESat.[4]

LHPs were first flight demonstrated on the NASA space shuttle in 1997 with STS-83 and STS-94.

Loop heat pipes are important parts of systems for cooling electronic components.

From Wikipedia : en.wikipedia.org/wiki/Loop_heat_pipe


我确实不是相关专业的，看这个公司官网的介绍，结构比热管复杂，体积较大。看wiki的介绍，实际上是对传统热管的改造。

909648183 发表于 2017-1-11 11:54
Applications[edit]The first space application occurred aboard a Russian spacecraft in 1989. LHPs a ...

wiki 和百度一样不可靠，你看看正常论文里谁敢有引用WIKI的
你能找到前三个应用的引用源？

tommycai 发表于 2017-1-11 11:58
wiki 和百度一样不可靠，你看看正常论文里谁敢有引用WIKI的
你能找到前三个应用的引用源？
...

你搜索关键词错了

在sci里搜索Loop heat pipe就又一堆文献了
http://www.sciencedirect.com/sci ... i/S1359431104002066

随便一篇相关文献就会在引文部分介绍应用于空间技术

909648183 发表于 2017-1-11 12:03
你搜索关键词错了

在sci里搜索Loop heat pipe就又一堆文献了

这我就明白了，我们没讨论到一块儿去

我在说的是如何验证在长期使用的情况下LHP的稳定性，热管内是否会结垢。因为我看LHP跟普通的热交换器在结构上非常相似，而且这家公司在把LHP用在电路板冷却的时候明确提到是不用泵的，所以我比较奇怪：1.这个自然循环的效率为什么会这么高（因为他的标称值真的很高）；2.长时期使用的情况下如何保证循环的稳定性；3.长时间使用后LHP的性能是否会下降。
我按着 heat pipe degradation 去找，没有啥发现

你在说的是LHP的工作原理，起源和应用
比如 http://www.sciencedirect.com/sci ... i/S1359431116322670
http://www.sciencedirect.com/sci ... 9780128097601000077

说实在的，现在我也不接触这一块儿了，也没时间静下心来读文章，但是我猜测没有非常成熟的应用经验，不应该会用在地铁，风电等相关设备的这种领域。

909648183 发表于 2017-1-11 12:03
你搜索关键词错了

在sci里搜索Loop heat pipe就又一堆文献了

http://www.sciencedirect.com/sci ... i/S1359431112004206

目前为止找到的唯一一篇，还是讲flattened heat pipe，我不清楚lhp算不算是flattened heat pipe

贴个conclustion

The performance degradation by flattening has been experimentally
studied for f6 mm copper/water heat pipes under
a horizontal orientation. Powder and groove wicks are investigated.
Both types of heat pipe are charged with their wicks saturated with
water. Either the evaporator or the full heat pipe is flattened. The
heat pipes are flattened to 3 mm and 2.5 mm, and the grooved heat
pipes are further flattened to 2 mm. The maximum heat loads, the
overall thermal resistances, the evaporation resistances, and
condensation resistances, along with the longitudinal temperature
distributions are measured for unflattened and flattened heat
pipes. By comparing their differences in the above measured
quantities, the following conclusions are reached:
1. Different mechanisms of performance degradation are
observed for flattened powdered and grooved heat pipes. Since
the powdered heat pipe has a thicker wick and larger water
charge, the main degradation mechanism is water clogging at
the condenser end. This causes malfunction when a f6 mm
powdered heat pipe is flattened to 2.5 mm. When flattened to
3 mm, the powdered heat pipe exhibits milder degradation
than a grooved heat pipe because the powder wick provides
better protection for the returning liquid flow against the
vaporeliquid interfacial shear. In contrast, the main degradation
mechanism for a flattened grooved heat pipe is the
vaporeliquid interfacial shear which leads to serious Qmax
degradation by greatly prompting dryout at the evaporator.
Due to the smaller charge in a grooved heat pipe, water clogging
at the condenser end is mild even when flattened to 2 mm.
2. Flattening leads to slightly lower evaporator resistances for
powdered heat pipes. For grooved heat pipes, this occurs only
at low heat loads. Such an effect may be related with the slight
sinking of water at the cylindrical evaporators.
3. The thermal resistance associated with the hydraulic loss of the
vapor flow plays a minor role even for highly flattened heat pipes

tommycai 发表于 2017-1-11 15:43
http://www.sciencedirect.com/sci ... i/S1359431112004206

目前为止找到的唯一一篇，还是讲flattened h ...

http://www.sciencedirect.com/sci ... i/S1359431104002066

At present the main area of application of loop heat pipes is space technology. The first flight experiment in conditions of microgravitation was conducted in 1989 aboard the Russian spacecraft “Gorizont” [31]. The experimental module included an LHP with three parallel evaporators 24 mm in diameter and a condenser of the collector type joined to the panel of a radiator. The vapor and the liquid line 6 mm in diameter had a length of about 0.6 m. The evaporators were combined with a common plate measuring 100 × 100 mm, on which heat-load simulators of capacity 40, 80 and 120 W were located. Freon-11 was used as a working fluid.

The first actual application of LHPs took place in 1994 aboard the Russian satellite “Obzor”, where two ammonia and one propylene LHPs were installed in the thermoregulation system of the unit of optical instruments

At present LHPs are finding ever widening use in space, where several tens of such devices are already successfully used [55] and [56]. In particular, a unique thermoregulation system including six LHPs was installed aboard the Russian spacecraft “Mars-96”. The same number of LHPs is used in the cooling system of nickel–cadmium batteries on a Chinese meteorological satellite FY-IC. Sixty two ammonia LHPs are installed on six American satellites Hughes-702. On another American spacecraft ICESar, launched in 2003, use is made of two propylene LHPs with active control for cooling the Geoscience Laser Altimetry System (GLAS).

毕竟我不是这个专业方向的，没精力仔细研究，就随便找了下LHP在空间科技中的应用，经过这么多年的实践（这是篇2004年的综述，所以在应用方面仅统计到2003年），肯定在维护方面是没有问题

tommycai 发表于 2017-1-11 15:37
这我就明白了，我们没讨论到一块儿去

我在说的是如何验证在长期使用的情况下LHP的稳定性，热管内是否会结 ...

你给的两篇文献都是 heat pipes的，不是Loop heat pipe的。。。。。
两者的结构都不同，Loop heat pipe明显比heat pipes复杂

传统的heat pipes连最基本的重力问题都无法解决，是不可能应用于空间科技的

909648183 发表于 2017-1-11 16:17
你给的两篇文献都是 heat pipes的，不是Loop heat pipe的。。。。。
两者的结构都不同，Loop heat pipe明 ...

所以我说我没找到LHP老化相关的论文啊，aging, degradation 都没有，我才纳闷呢。

经过这么多年的实践（这是篇2004年的综述，所以在应用方面仅统计到2003年），肯定在维护方面是没有问题

用于AEROSPACE和COMMERCIAL的东西区别比较大，两者从产品设计理念的出发点就不同，COMMERCIAL要求的是经济耐用，符合最低限度的要求。AEROSPACE要求的是在特定工况下满足特定要求，而且在特定工况下需要足够可靠。两者之间的相关性不强。
有些设备可以用在航空，也可以用在商业级的场合，有些就不行。

另外，在航空应用的设备要求的寿命跟商业级也存在区别，有些设备就是一次性的，或者要求在一定时间内可靠，然后这玩意儿就变成太空垃圾了。
商业级的散热器必须是24H全年无休，万一坏了那不是自砸招牌。所以我想看到的是为什么LHP能在商业领域应用，它的可靠性是通过什么方式验证的，有没有做过AGING实验之类的材料。

你给的两篇文献都是 heat pipes的，不是Loop heat pipe的。。。。。
两者的结构都不同，Loop heat pipe明显比heat pipes复杂

传统的heat pipes连最基本的重力问题都无法解决，是不可能应用于空间科技的

讲DEGRADATION的是FLATTEN HEAT PIPE，从整体结构设计上跟LHP存在挺大的区别，但是可以从FHP文章的照片里看到，长时间使用确实存在结垢现象，如果结垢发生在毛细部分，毫无疑问会有很大的性能影响，目前我还没看到这方面的相关材料，因此疑惑。

我始终关注的是商业化的应用，大概是我表述地不太好，你没理解我之前的意思

tommycai 发表于 2017-1-11 16:39
所以我说我没找到LHP老化相关的论文啊，aging, degradation 都没有，我才纳闷呢。

上面的回复提到了LHP用在了中国的气象卫星风云一号（FY-1C）上面，这颗卫星1999年升空，至2007年1月11日发射导弹击毁，服役了8年之久，说明这种散热装置应该耐久度应该是很好的，而且卫星退役一般也不会是因为散热系统出问题。

ltlt2006 发表于 2017-1-8 21:49
然而并不是制冷片，只是热管而已

热管也需要鳍片才有较好的散热能力啊

红色国度 发表于 2017-1-11 19:35
热管也需要鳍片才有较好的散热能力啊

这个应该是热管效率非常高，靠废热驱动，不许要额外动力，至于排掉热量应该还是传统方式