【摘要】：為研究蒸汽流量對(duì)蒸汽直接接觸凝結(jié)及汽泡表面變化過(guò)程的影響,利用高速攝像儀記錄一定過(guò)冷度、不同蒸汽流量條件時(shí)過(guò)冷水中蒸汽的凝結(jié)過(guò)程.實(shí)驗(yàn)結(jié)果表明:蒸汽流量小于0.36m~3/h時(shí),汽泡表面始終較光滑;當(dāng)蒸汽流量升至0.74m~3/h時(shí),汽泡表面上出現(xiàn)波動(dòng),汽泡最終逐漸分裂成數(shù)個(gè)小汽泡;當(dāng)蒸汽流量大于1.13m~3/h時(shí),汽泡表面上的波動(dòng)非常劇烈,汽泡不穩(wěn)定性增強(qiáng),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(guò)1.13m~3/h后,汽泡在凝結(jié)時(shí),其相對(duì)半徑迅速減小,半徑變化率迅速增加.汽泡表面劇烈的波動(dòng)會(huì)極大的增加汽泡有效換熱面積,導(dǎo)致蒸汽與過(guò)冷水間的傳熱和傳質(zhì)過(guò)程被極具的加強(qiáng).
[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(guó)防重點(diǎn)學(xué)科實(shí)驗(yàn)室;四川大學(xué)水利水電學(xué)院水力學(xué)與山區(qū)河流開(kāi)發(fā)保護(hù)國(guó)家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金(51376052,11175050,51106101) 四川大學(xué)科研基金(YJ201432)
【分類(lèi)號(hào)】：TK124

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