热管测试

热管测试
日期:2005-12-7 17:56:42 来源:来自网络查看:[大中小] 作者：椴木杉热度：1053
1 热管测试安装如上图所示。

2.加热块长度：DA=40mm，散热块长度：DB=35mm，室温:Te：25±3℃。

3.在HEATPIPE的一端加热並将温度保持在TH=70±5℃，另一端利用水套（或风扇）强制冷卻（冷卻端永远保持最大冷凝功效）- -此？的功率？？管的最大？？功率。

4.HEATPIPE加热端利用电源供应器提供加热端所需之加热功率。

A-尺寸区分：
直径：Φ4 Φ5 Φ6 Φ8
B-型状区分：
直管型U型U型压扁型
压扁折弯型圆管型S型
C-长度区分：
80∽500
危害物质管理六大项：
铅及其化合物（Lead and its Compounds）
汞及其化合物（Mercury and its Compounds）
六价铬化合物（Hexavalent-Chromium VI）
镉及其化合物（Cadmium ang its Compounds）
多溴联苯（PBB）
多溴二苯醚（PBDE）
热管通过完美的性能测试Complete heat pipe R&D and testing capability。

弯度和横面计算准确Precision bending and flatttening
100%的抗老化和性能测试 100%aging and testing
产品效率高 Hight production efficiency
散热能力强 Hight heat transfer capability
低热阻系数 Low thermal resistance
热管的直径及大小和下图一致The dimensional attributes of this heat pipe shall conform to the following drawing.
表一热管的尺寸Fig. 1 Heat Pipe Dimensions
热管的表面应避免任何损坏,比如人为错误使用等。

The appearance shall be free of any damage such as will be harmful to use
5. 漏水测试和热反应测试 Leak Test and thermal response Test
热管性能都依赖于其所能承受的高温环境和内部的高压。

热管必须通过下列热反应测试来检测是否泄漏从而确保其正常性能。

该测试按照热管的使用温度标准执行。

热管顶部装有一大约是管长四分之一的水流恒温器，恒温器的温度设在50度或着接近热管顶部的温度。

表1的数字是将热管竖立在水中进行测量的，也是在自动测试仪器下进行的。

热管的热平衡性能在20秒的标准为Tw—T1小于4度，检测结果如图2所示。

Every manufactured heat pipe is subjected to an environment of hight temperature and high internal Pressure to be aged. Following being aged every heat pipe must also pass thermal response test to check its leakage and to ensure its normal function. The test executes temperature measurements at the top of a heat pipe, which is inserted in a thermostat of water bath by about 25% of its length. The water bath temperature, Tw is set at 50 ℃ and the temperature near the top of the heat pipe.
T1 is measured immediately after it is placed vertically into the bath. The test is performed by an automatic tester and the criterion for acceptance of a heat pipe is Tw - T1 < 4℃ in an elapsed time of 20 seconds. A typical test result is shown in Fig.2检测结果如图2所示。

检测结果如图2所示Fig2. Typical thermal response test result
6. 热管性能 Thermal Performance
为了评估热管的热性能，热管通常是在模拟或理想的操作环境中进行的。

热电偶放在热管的顶部来控制热管的温度变化。

在测试过程中，通过给里面逐渐加热而外面保持常温，在检测热管加热变化过程的数据，来得到热管的最大传热率。

像图表3的演示：理论分析显示了热管的最大容量是受工作介质/内部结构/及操作等环境影响。

例如：倾斜的角度，热管的有效长度。

表2详细显示了扁的IEI热管性能的数字。

To evaluate the thermal performance of a heat pipe, a heat pipe is usually tested in a simulated and ideal operating condition.?Thermocouples are placed along the heat pipe to monitor the temperature variations along the heat pipe.?During the test, by increasing heat input gradually while maintaining operating temperature constant, maximum heat transfer rate, Qmax of a heat pipe occurs before a drastic temperature rise of the heated section is detected, as shown in Fig. 3.?Theoretical analysis shows the maximum heat transfer capability is affected by working fluids, wick construction and operation conditions,?such as temperature and inclination angle, as well as the effective length of the heat pipe.?Table 2 details the IEI flattening heat pipe performance dataFig. 3Temperature Variation along Heat Pipe
图3 热管的温度变化表
表2 扁的热管的性能数据
Table2 扁的热管的性能数据
Fig3 热管的温度变化表Table3 Operating Environment
8. 注意事项Machining
不正确的操作，像弯曲或压扁等，可能会造成热管里面或结构的破坏，而这些又会导致热管性能不好或失去散热的功能。

由于使用者的不正确操作和第三方的不正确操作造成热管性能不好问题， YODA对此不承担任何责任。

IEI 表明弯型热管的半径应是直管直径的三倍，轻微的压弯不会影响热管的性能（一般小于百分之十五），如果压扁热管超出了所规定的界限，就会造成使用性能低于最大散热率的百分之五十，从而造成热管性能严重下降。

为此如果压扁热管，在热量设计中就应该小心。

Improper Machining (bending, flattening and so on) after delivery may cause damage to container and wick structure, which results in poor performance or failure of heat pipes. YODA shall not take any responsibility for its heat pipes after improper machining performed by users or any third party. IEI suggests a minimum centerline bend radius of 3 times the diameter for bending heat pipes. A slight bending of these heat pipes has no obvious lose (typically ＜15%) in the performance of the heat pipes. Flattening of heat pipes beyond suggested limits will cause serious performance degradation larger than 50% in maximum heat transfer rate. Care should always be taken in thermal design when flattening of heat pipes is needed.
9. 包装Packaging
热管在运输过程中包装不应受到破坏
The heat pipe shall be packaged not to be damaged in transportation.。