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頁籤選單縮合
題 名 | The Influences of Vapor Bobbles on Heat Transfer Process Within a Simulated Fire Tube Boiler=汽泡對火管鍋爐熱傳過程之影響研究 |
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作 者 | Chang,S. W.; Shyu,Y. T.; Wu,J. W.; Chiou,S. F.; | 書刊名 | 國立高雄海技學報 |
卷 期 | 13 1998.06[民87.06] |
頁 次 | 頁63-71 |
分類號 | 446.329 |
關鍵詞 | 汽泡; 火管鍋爐; 熱傳過程; Boiling; Heat transfer; Fire tube boiler; |
語 文 | 英文(English) |
中文摘要 | 本文發表針對火管鍋爐水鼓水側熱傳過程之實驗研究結果。為增進其熱傳性能, 鍋爐水鼓內之熱水採行強制對流。此項研究首先進行流體觀測實驗(Flow Visualization Test)以求更進一步瞭解受有強制流影響下核沸騰之汽泡生成過程。接續之熱傳實驗使用雷 諾數分別為6000, 7750及11200。對於任一雷諾數,實驗檢測4種不同加熱程度(分別提供0.2, 0.4, 0.7及0.9MW/m�握尬鶶q量)下核沸勝之熱傳係數。實驗結果證明汽泡對熱傳現象造成 可觀之影響。經由汽泡隨著流場成長之影響,於汽水界面附近之熱傳係數隨時間震盪。由於 將強制流引入核沸騰過程,熱傳係數可增高至同樣雷諾數下單相流之300%。 |
英文摘要 | This paper presents the results of an experimental program aimed at investigating the heat transfer phenomena taking place inside the water drum of a simulated fire tube boiler. As an attempt to further increase the heat transfer performance of the boiler, the circulation of heated water within the drum was introduced. The flow visualization tests were initially conducted in order to probe into the physics of nucleating boiling under the influences of bulk flow motion further. Heat transfer tests at four different flow rates with through flow Reynolds numbers of 6000, 7750, 9500 and 11200 were performed. For each Reynolds number tested, the nucleate boiling situations under four different heating levels, namely 0.2, 0.4, 0.7 and 0.9 MW/m�掣ere examined. The experimental reaults confirmed the significant influences of vapor bobbles on the heat transfer. Due to the possible effects of bobble evolution along with the flow, the time dependent heat transfer fluctuation and oscilation at the locations near the fluid/vapor interface were observed. Up to 300% of heat transfer enhancement relative to the equivalent single-phase forced convective flow could be achieved as a results of the introduction of bulk flow motion into the boiling process. |
本系統中英文摘要資訊取自各篇刊載內容。