1) pool-film boiling
池内膜态沸腾
2) nucleate pool boiling
池内核态沸腾
1.
In this paper,surface tension,thermal stability,performance of nucleate pool boiling and mass distribution ratio during evaporation process of anionic surfactant sodium dodecyl sulfate(SDS),nonionic surfactant Triton X-100 and Triton X-114 which are representative and industrial applicated extensively and their aqueous solutions were studied experimentally under laboratorial conditions.
本文选用了工业上广泛应用且有代表性的阴离子表面活性剂十二烷基硫酸钠(SDS),非离子表面活性剂曲拉通X100(Triton X-100)和曲拉通X114(TritonX-114)为研究对象,在实验室条件下对这三种表面活性剂水溶液表面张力、热稳定性、池核沸腾换热特性及蒸发过程的质量分配进行实验研究;并结合表面活性剂在水溶液气液和固液界面上的吸附作用、池内核态沸腾换热及蒸汽携带水滴相关理论,阐释了表面活性剂对水池内核态沸腾换热的影响机理及其水溶液蒸发过程的质量分配规律。
3) pool boiling
池内沸腾
1.
In this paper an experimental investigation of pool boiling heat transfer at horizontal plate surface is conducted for 26 nm Fe-water and 13nm Al2O3-water nano-particle suspensions.
本文对纳米颗粒悬浮液在平壁面上池内沸腾进行了实验研究。
2.
In order to further confirm the feasibility to simulate complicated phase transitions with the present model,the simulation on pool boiling and boiling flow in a vertical pipe is conducted.
为进一步验证该模型模拟复杂相变问题的可行性,利用该模型对池内沸腾和垂直管道中的流动沸腾现象进行了模拟,观察到气泡随时间变化不断长大,气泡受浮升力的影响脱离壁面,以及气泡在液相中上升时发生碰撞、聚合等现象。
3.
Several fractal models for the nucleate pool boiling, subcooled flow boiling,CHF and nanofluids boiling heat transfer are reviewed,summarized and discussed.
简要评述了沸腾换热(池内沸腾、流动沸腾、临界热流密度和纳米流体沸腾换热)的研究进展;详细论述了采用分形理论和方法研究沸腾换热分析解的理论和方法;指出了采用分形理论和方法有可能解决其它尚未解决的有关沸腾换热的若干课题和方向。
4) Film boiling
膜态沸腾
1.
Experimental study of heat and dynamic chara cteristics of hot particles moving in coolant under film boiling condition;
膜态沸腾条件下高温颗粒周围流体热动力特性的实验研究
2.
To study the change in configuration of oil droplets and their heat exchange with high-temperature wall surfaces when film boiling occurs as a result of spray-mist oil beam impinging on the high-temperature wall surfaces, the authors have improved an impingement model featuring oil droplet impingement on hot wall surfaces.
为研究喷雾油束碰撞高温壁面发生膜态沸腾时,油滴的形态变化及与热壁面之间的换热,改进了油滴碰撞高温壁面的碰撞模型,碰壁换热模型源于相关实验的经验模型。
3.
The paper analysis the theoretical model for heat and dynamic characteristic of a hot particle moving in coolant liquid under film boiling and develops a mathematical model on the base of the mass, momentum and energy conversation equations of liquid film.
对膜态沸腾条件下冷液中运动高温球传热阻力耦合特性理论模型进行了分析,以液膜质量、动量和能量守恒方程为基础,结合对高温颗粒在冷却剂中运动的详细受力分析,提出了一个基于特殊复合结构的高温颗粒在冷却剂中运动的传热阻力数学物理模型。
5) filming boiling
膜态沸腾
1.
One set of one-dimensional unsteady homogenous mathematic models for flow and heat process of natural circulation precooling loop of cryogenic liquid rocket engine was established,whilst both inverted annular model and dispersed model were introduced for the prediction of filming boiling region.
针对低温液体火箭发动机预冷自然循环回路的流动与传热过程,建立了一维非稳态均相流数学模型,采用反环状流和弥散流两种流型描述膜态沸腾流型及传热特性。
6) Nucleate pool-boiling
池内核沸腾
补充资料:膜态沸腾
膜态沸腾
film boiling
moto一fe一teng膜态沸腾(film boiling)在一定条件下,亚临界压力锅炉的蒸发受热面中水或汽水混合物与管壁间被一层汽膜隔开,导致传热系数急剧下降,管壁温度急剧升高,甚至出现过烧的现象。膜态沸腾又称传热恶化,按机理分为第一和第二两大类。 第一类传热恶化发生在欠热区和低含汽率区。热负荷很高时,蒸发管内壁汽化核心数剧增,汽泡生成速度超过脱离速度而形成汽膜,也称偏离核态沸腾(departure from nueleate boiling,DNB)。发生此类传热恶化时,传热系数急剧下降,壁温飞升,往往出现过烧。受热面热负荷是引起传热恶化的决定性因素,判定转入传热恶化的热负荷称临界热负荷,其他影响因素有质量流速、含汽率(或欠热值)、压力、管径及受热面状态等。 第二类传热恶化发生在含汽率较高的环状流动区。很薄的水膜被撕破或蒸发,管壁仅受蒸汽冷却,也称燕干(dry一out),此时传热系数下降,壁温飞升(均小于第一类传热恶化),经常伴有壁温波动(幅度为60~125℃),常导致管壁发生热疲劳破坏。引起第二类传热恶化的决定性因素为含汽率。判定转人传热恶化的含汽率为临界含汽率。其他影响因素有质量流速、热负荷、管径及压力等。 保证一定的质量流速,采用内螺纹管、来复线管、扰流子,降低受热面热负荷等均可推迟传热恶化或改善传热恶化发生的壁温异常。 在超临界压力下,最大比热区也能发生传热恶化(又称类膜态沸腾)。在一定热负荷下,传热恶化与否,主要取决于质t流速。如果质量流速太高又会引起阻力上升。因而超临界压力锅炉可采用复合循环方式,来提高水冷壁的安全性。
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