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頁籤選單縮合
題名 | 彎曲角度對燒結式微熱管性能之影響分析=A Study of the Effects of Bending Angle on a Sintered Miniature Heat Pipe Performance |
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作者 | 莊書豪; 王俊彥; 戴芳美; Chuang, Shu-hao; Wang, Chun-yen; Tai, Fang-mei; |
期刊 | 機械技師學刊 |
出版日期 | 20141100 |
卷期 | 7:3 2014.11[民103.11] |
頁次 | 頁58-62 |
分類號 | 446.1 |
語文 | chi |
關鍵詞 | 燒結式熱管; 毛細結構; 彎曲; 熱阻; Sintered heat pipe; Wick structure; Bending; Thermal resistance; |
中文摘要 | 本文之主要研究目的為探討熱管彎曲角度其熱傳性能的影響。本實驗所採用熱管折彎參數共分為R25、R30、R35、R40、R45、R50、R55與未折彎8組。本文針對熱管所作試性能測試分為1.熱響應測試。2.最大熱傳量測試。3.熱阻值的計算。並依據工研院能環所簡國祥博士所提出的「熱管性能檢測方式之介紹」進行測試。熱響應部分,彎曲角度越小,工作流體因角度影響溫度傳遞變慢,相對彎曲角度越大溫度傳遞較快,由實驗可知該測試熱管冷凝端之溫度均可迅速的反應加熱端之溫度並呈現穩態。最大熱傳部分,當熱傳率在55W~60W且R25、R30、的R35時,熱管因為毛細結構被破壞,在加熱端與冷凝端溫差5℃工作流體流回蒸發端,造成熱管不穩定。又R40、R45熱管彎曲的程度較R25、R30、R35小,其毛細結構破壞也較少,相對的蒸氣通道也受到影響故熱傳率提升。當R50、R55時熱管因工作流體循環阻力減少,相對能解的瓦數可高至60W-65W、65W-70W。最後針對直管與彎管進行比較,熱管彎曲角度為R25、R30、R35時,其性能比直管下降15%,當熱管彎曲角度為R40、R45時其性能比直管下降10%,當熱管彎曲角度為R50時其性能比直管下降5%,當熱管彎曲角度R55時其性能比直管下降程度較小。熱阻部分,當熱傳率在55W且R25、R30、R35時毛細結構破壞程度較大,其熱阻值分別為0.07(℃/W)、0.09(℃/W)、0.10(℃/W)已無法正常運作。當熱傳率在60W且R40、R45時毛細結構破壞程度較R25、R30、R35小,其熱阻值分別為0.10(℃/W)、0.10(℃/W)已無法正常運作。當熱傳率在65W且R50、R55時毛系結構破壞最小,其熱阻值分別為0.09(℃/W)、0.09(℃/W)已無法正常運作。由此計算更能增加判斷出熱管是否燒損。由實驗結果可知彎曲角度越大毛細結構破壞越大,因而造成蒸氣通道受到破壞,進而影響熱管性能;相對彎曲角度越小破壞較小。 |
英文摘要 | The purpose of this paper is to probe into the effects of the bending angle on heat pipe of its thermal performance. This test for heat pipe bending angle parameters are R25, R30, R35, R40, R45, R50, R55 and non-bended Respect ively. Tests on heat pipe performance are classified into: 1. Thermal response test. 2. Max. thermal conductivity test. 3. Calculation of thermal resistance. Besides, tests are carried out according to the Introduction of Detection Methods of Heat Pipe Performance by Dr. Chien, Kuo-Hsiang of the Energy and Environment Research Laboratories, Industrial Technology Research Institute. As for thermal response, when the temperature transfer of the working fluid is slower the bending angle is smaller, due to the impact of the angle. Reversely, the temperature transfer of the working fluid is faster when, the bending angel is larger, From the tests we can obtain that the temperature of the condensed end of the tested heat pipe can immediately reflect the temperature of the heated end and be kept in steady status. As for max thermal conductivity, when the capacity of thermal conduction is at 55W~60W and R25, R30, or R35 is adopted, The temperature difference between the heating end and the condensed end is 5℃since the wick structure of the heat pipe is damaged. And the working fluid will flow back to the vaporized end causing instability of the heat pipe. Moreover, since the bending degree of heat pipes at R40 and R45 is less than that at R25, R30 and R35, the wick structure is less damaged and the corresponding vaporizing channel is also impacted, leading to the improvement of the thermal conductivity. As for heat pipes at R50 and R55, due to the reduction of the circular resistance of the working fluid, corresponding capacity of thermal conduction can reach to 60W~65W and 65W~70W. Finally, according to the comparison between straight pipes and bended pipes, when the heat pipe bending angle is at R25, R30 or R35, the performance of the heat pipe can decline by 15% compared to that of straight heat pipe. When the heat pipe bending angle is at R40 or R45, the performance of the heat pie can. Decline by 10% compared to that of straight heat pipe. When the heat pipe bending angle is at R50, the performance of the heat pipe can decline by 5% compared to that of straight heat pipe. When the heat pipe bending angle is at R55, the performance of the heat pipe can decline a little compared to that of straight heat pipe. As for thermal resistance, when the capacity of thermal conduction is at 55W and R25, R30 or R35 are adopted, the wick structure is subject to greater damage, the thermal resistance are 0.07(℃/W), 0.09(℃/W) and 0.10(℃/W) respectively, normal operation is disabled. When the capacity thermal conduction is at 60W and R40 and R45 are adopted, the damage to the wick structure is less than that at R25, R30 and R35, the thermal resistance are 0.10(℃/W), 0.10(℃/W) respectively, normal operation is disabled. When the capacity of thermal conduction is at 65W and R50 and R55 adopted, the wick structure is subject to the least damage, the thermal resistance are 0.09(℃/W) and 0.09(℃/W)respectively, normal operation is disabled. From the present results, we can show that the heat pipe is burnt or not. According to the results of the tests, the larger bending angle, the greater damage to the wick structure, which will result in damage to the vaporizing channel and thus influence the performances of the heat pipe. On the contrary, smaller bending angle will result in smaller damage. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。