化工学报2017，Vol.68Issue(2)：575-583,9.DOI:10.11949/j.issn.0438-1157.20160927
压力旋流式喷嘴喷淋液膜区换热过程的数值模拟
Numerical simulations on sheet region of spray cooling process of pressure-swirl nozzle
摘要
Abstract
The commercial software Fluent 15.0 is employed to carry out the numerical simulation on the internal and external flow fields of the pressure-swirl nozzle. The axisymmetric 3-D flow field is represented by an equivalent 2-D grid. The VOF multiphase flow model and Reynolds stress model (RSM) are chosen. Numerical simulations on flow fields are performed in two different circumstances: ① Gas phase is specified as air and there is no heat and mass transfer between phases; ② Gas phase is saturated steam, heat and mass transfer exists between phases. Lee model, a computational model embedded in Fluent 15.0, is specified as the phase-transition model of heat transfer. Comparisons between CFD simulations and experiment are launched. The internal and external flow fields are analyzed based on simulation datum. Results indicate that an air core forms inside the nozzle due to the helical motion of liquid phase, velocity of which increases sharply at the junction of contraction section and orifice’s straight pipe section of the nozzle. Furthermore, comparisons are also performed between circumstance ① and ②. Numerical simulation results indicate that when heat and mass transfer exists between phases (i.e. in case of circumstance ②), (1) pressure of the flow fields is slightly lower and peak velocity is larger;(2) heat transfer coefficient of liquid film decreases gradually along the flow direction;(3)the film is thicker due to the vapor condensation, and liquid film breakup length is larger.关键词
喷嘴/流体力学/数值模拟/传质/Lee相变模型Key words
nozzle/fluid mechanics/numerical simulation/mass transfer/Lee model分类
化学化工引用本文复制引用
潘阳敏,罗祎青,王丽雯,袁希钢..压力旋流式喷嘴喷淋液膜区换热过程的数值模拟[J].化工学报,2017,68(2):575-583,9.基金项目
国家自然科学基金项目(21676183)。 （21676183）
