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題 名 | Conjugate Heat Transfer of Polymer Melt Flowing in a Thick Wall Tube=熔融高分子在厚壁圓管中之共軛熱傳問題 |
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作 者 | 曾憲政; 朱義旭; 陳泰源; | 書刊名 | Journal of the Chinese Institute of Chemical Engineers |
卷 期 | 17:2 1986.03[民75.03] |
頁 次 | 頁91-98 |
分類號 | 460.02 |
關鍵詞 | 共軛; 厚壁圓管; 高分子; 熔融; 熱傳; |
語 文 | 英文(English) |
中文摘要 | 熔融高分子在毛細管中流動和傳統液體流動之不同在於高壓降,高點度及厚管壁。在本文中作者考慮在點度受溫度及壓力之影響且管璧之熱傳阻力不能忽略之情況下,以有限差分法解相關之動量及能量方程式,以得到熔融高分子在毛細管中之速度,溫度以及壓力分佈。計算結果發現對商用不銹鋼製毛細管而言,除非在視剪切率大於10□□的情況下,管壁之熱傳阻力可以忽略不計。由於在毛細管中壓力一般極大(~□ Pa)所以壓力對點度之效應不能忽略。在管壁為恆溫條件下,如果管壁溫度等於進口溫度,則徑向對流效應可以忽略。然而對冷卻式毛細管(管壁溫度低於入口溫度時)而言,徑向對流對熱傳有很大的影響。對壓力及速度而言亦有類似結果,亦即在冷卻式毛細管時徑向對流之效應不可忽略。 |
英文摘要 | Capillary flow of polymer melt is characterized by high pressure gradient, high viscosity and thick tube wall. In this paper, were obtain velocity, temperature and pressure distributions of polymer melt flowing in a capillary tube by solving the corresponding momentum and energy equations using finite difference method; taking into account the effect of viscous heating, tube wall resistance and the dependence of viscosity on temperature, pressure as well as shear rate. Calculated results show that for commercial capillary tube made of stainless steel, the effect of metal wall resistance can be neglected expect when the apparent shear rate is greater than □. The dependence of viscosity on pressure can not be neglected due to the high pressure exists in the flow of polymer melt in a capillary tube (~□ Pa). The effect of radial convection on the rate of heat transfer can be neglected for the case of isothermal wall condition with wall temperature equal to the melt inlet temperature. However, for the case of cooling type capillary tube with metal temperature lower than the melt inlet temperature, radial convention does have significant effect on the rate of heat transfer. Results obtained for pressure and velocity distribution also show differences between isothermal and cooling type boundary condtions. |
本系統中英文摘要資訊取自各篇刊載內容。