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題名 | 密閉空間內非等溫高溫壁面實驗研究=Experimental Study for Natural Convection in an Enclosure under Nonuniform Temperature at the High Temperature Wall |
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作者 | 傅武雄; 林憲駿; | 書刊名 | 力學 |
卷期 | 12:2 1996.06[民85.06] |
頁次 | 頁187-195 |
分類號 | 335.24 |
關鍵詞 | 自然對流; 實驗研究; 流體可視化; Natural convection; Enclosure; Experimental study; |
語文 | 中文(Chinese) |
中文摘要 | 本文以實驗方法探討左、右壁面分別為等高、低溫壁面,其餘壁面為絕熱壁面的 方形密閉空間內自然對流現象。為精確量測高溫壁面之局部紐塞,在高溫壁面由十片主加熱 片及左右各五片副加熱片所組成,熱量來源是由直流電源供應器加熱鎳鉻絲所產生,並可分 別控制主、副加熱片,因此可以求得高溫壁面局部紐塞數。工作流體則以空氣及純水探討雷 理數由 5 × 10 �藷雂あ� 2 × 10 �簾氶A高溫壁面的局部紐塞數分佈情形,並且與數值解 比較。兩者的結果相當一致。 此外並探討高溫壁面分成較高區域 T 與次高溫區域 T,而低溫壁面仍維持均一溫度 T �搌� 自然對流現象。實驗發現下方 T 溫度區域的局部紐塞數分佈整個高溫壁面為 T 時之局部紐 塞數分佈為低,而上方 T 溫度區域的局部紐塞數則較整個高溫壁面為 T 時之局部紐塞數分 佈為高。在流場方面,當兩區域大小相近時,則在兩壁面分別形成渦流。而兩區域大小相差 甚大時,則只在面積大的等溫區域形成渦流。 |
英文摘要 | Experiments have been carried out to investigate free convection in a cubic enclosure with adiabatic walls except two vertically parallel isothermal walls with different temperatures. The heating system is composed of ten main heaters and guard heaters in order to measure local Nusselt number of the heated wall. The working fluids are air and pure water, and Rayleigh number is varied in the range from 5 × 10 �� to 2 × 10 ��. The experimental data of the local Nusselt number are in good agreement with numerical results. Another part of the study is to divide the higher temperature wall into two regions: the upper region with a temperature T higher than a temperature T of the lower region. The cold wall is still at a lower temperature T ��. Experimental results show that local Nusselt number of the lower region is lower than that of the wall at constant temperature T. But an opposite trend is observed in the upper region. The average Nusselt number is smaller than that when this wall has not been divided. |
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