【摘要】：為研究蒸汽流量對蒸汽直接接觸凝結(jié)及汽泡表面變化過程的影響,利用高速攝像儀記錄一定過冷度、不同蒸汽流量條件時過冷水中蒸汽的凝結(jié)過程.實驗結(jié)果表明:蒸汽流量小于0.36m~3/h時,汽泡表面始終較光滑;當蒸汽流量升至0.74m~3/h時,汽泡表面上出現(xiàn)波動,汽泡最終逐漸分裂成數(shù)個小汽泡;當蒸汽流量大于1.13m~3/h時,汽泡表面上的波動非常劇烈,汽泡不穩(wěn)定性增強,并最終破碎成大量微汽泡.且隨蒸汽流量增,這些微汽泡的直徑減少,噴射速度增加.蒸汽流量超過1.13m~3/h后,汽泡在凝結(jié)時,其相對半徑迅速減小,半徑變化率迅速增加.汽泡表面劇烈的波動會極大的增加汽泡有效換熱面積,導(dǎo)致蒸汽與過冷水間的傳熱和傳質(zhì)過程被極具的加強.
[Abstract]:In order to study the influence of steam flow rate on the direct contact condensation of steam and the change process of bubble surface, the condensation process of steam in supercooled water was recorded by using a high-speed camera with a certain degree of undercooling and different steam flow conditions. The experimental results show that when the steam flow rate is less than 0.36m~3/h, the bubble surface is always smooth, and when the steam flow rate rises to 0.74m~3/h, the bubble surface fluctuates and the bubble eventually splits into several small bubbles. When the steam flow rate is larger than 1.13m~3/h, the fluctuation on the bubble surface is very intense, the instability of the bubble is enhanced, and a large number of microbubbles are finally broken up. With the increase of steam flow, the diameter of these microbubbles decreases and the injection velocity increases. When the steam flow rate exceeds 1.13m~3/h, the relative radius decreases rapidly and the radius change rate increases rapidly when the bubble condenses. The severe fluctuation of the bubble surface will greatly increase the effective heat transfer area of the bubble, resulting in the process of heat and mass transfer between steam and supercooled water is greatly enhanced.
【作者單位】： 哈爾濱工程大學(xué)核科學(xué)與技術(shù)學(xué)院核安全與仿真技術(shù)國防重點學(xué)科實驗室;四川大學(xué)水利水電學(xué)院水力學(xué)與山區(qū)河流開發(fā)保護國家重點實驗室;
【基金】：國家自然科學(xué)基金(51376052,11175050,51106101) 四川大學(xué)科研基金(YJ201432)
【分類號】：TK124

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