Numerical Simulation Of Liquid Vapor Separation Process In Manifolds With Porous Plate

Energy conservation and emission reduction, lifting energy efficient is very im-portant for live energy problem. Now boosting the equipment efficiency is an effec-tive method for energy conservation and emission reduction. Peng xiao feng raises a new method that can drain the condensed liquid during condensation process. We can improve heat transfer coefficient by raising the mean quality using this method.In this paper we analyze the principle of liquid vapor separation in liquid separa-tion condenser. Mainly research the control effects of manifolds on liquid vapor sepa-ration character and mass flow distribution. We discover the liquid flow physical me-chanism in porous plate by establishing the steady two phase flow mathematical mod-el. Simulate the unsteady liquid vapor separation, and reveal the effects of porous plate structure and inlet condition on liquid vapor separation. At last, simulate the ef-fects of porous plate on gas distribution. The main works as follows:1. Analyze the steady flow process and liquid vapor separation feature, we dis-cover that pressure, gravity friction stress and capillary function determine the leakage quantity, we establish the liquid flow mathematical model in manifolds. We discover that the hole number is about1-9and diameter is about0.5-4mm can realize the liquid vapor separation when inlet mass flow is48g/s and quality is0.4.2. Investigate the effect of porous plate structure on liquid vapor separation, in unsteady flow process. The results show that leakage percentage and outlet quality increased as hole diameter increased when the inlet mass flow is5.5g/s, and quality is0.3. However, the liquid film is damaged result in the separation failure when the hole becomes4mm. Under the same circulation rate, different combination can result in different separation effect. Among the combination, combination4shows the biggest outlet quality and leakage. This structure is the best structure among them.3. Based on above, we focus on the combination4and investigate the effects of condition on porous plate liquid vapor separation. The results show that lea- kage percentage and outlet quality increased as inlet quality increased when the inlet mass flow is5.5g/s under the low inlet quality. The biggest leakage is2.3g/s at the inlet quality0.25. However, the liquid vapor separation is failure under the inlet quality0.5. The leakage percentage and outlet quality become bigger showing the better separation effect as inlet mass flow de-crease when the inlet quality is0.3. However, the liquid film damaged when the mass flow less than5.2g/s or larger than9.5g/s.4. Simulate the distribution character in manifolds. The results show that for bringing the liquid case, the gas mass flow in every branch deviate the mean mass flow is20%,13%and40%. For the best liquid vapor separation case, the gas mass flow in every branch is43%,0and77%. For the liquid film damaged case, the gas mass flow in every branch deviate the mean mass flow is6.7%,10%and23%. Thus it can be seen that the liquid vapor sepa-ration and mass flow uniformity don’t have direct relationship, so needs more study.