关键词: 沸腾特性, 除湿, 真空, 汽化核心, 对流, 腐蚀

Abstract: Boiling heat transfer is an efficient way of heat transfer. In order to research the boiling heat transfer processes in regeneration of dehumidifying solution, the test experiment bench of boiling characteristics under vacuum was set up. Experimental study was conducted on water, LiCl solutions with mass concentration of 30%, 32% and 34%. Obtaining the effects of solution concentration on boiling heat flux density and boiling surface heat transfer coefficients. The results shows, with the increases of concentration, the surface tension increase and number of nucleation sites decreased, viscosity increases, bubble escape difficulty, disturbance reduced, so the heat flux density and boiling heat transfer coefficients of solution reduced. With the increase of temperature difference, the wall superheat increases, bubble formation increases and the disturbance to solution increases, so that the heat flux density and boiling heat transfer coefficient of solution increase.

Key words: boiling characteristic, desiccant, vacuum, nucleation site, convection, corrosion