Study On Pool Boiling Heat Transfer Performance Of Self-rewetting Solution Based On Nano-porous Surface

In this paper,The corrosion and scaling properties of B30 Cu-Ni alloy in static and dynamic conditions were investigated experimentally.In seawater are discussed under the condition of static Mg²⁺,SO₄^2-and temperature change the water surface calcareous deposits forming process for copper and nickel alloy,the influence of calcareous sediments was studied at the same time by soaking method for B30 protection of copper nickel alloy corrosion under the scale.In dynamic experiments to study the water flow rate,temperature,and changes in heat pipe heat flux for copper and nickel alloy corrosion and fouling,the influence of performance under different conditions is discussed relation between corrosion and scaling.In the static experiment,it was found that the Mg²⁺ and SO₄^2-in the seawater had a significant inhibitory effect on the formation of the crystal nucleus and the growth rate.The changes in the concentration of SO₄^2-only resulted in changes in the surface morphology of the calcareous sediments,while the change of Mg²⁺ concentration resulted in changes in the surface morphology and crystal structure of the calcareous sediments.At the same time,the increase of seawater temperature will promote the formation of calcareous sediments and cause changes in the morphology and crystal structure of calcareous deposits.By soaking corrosion test,it was found that,with the decrease of Mg²⁺,SO₄^2-concentration and the increase of seawater temperature,the protective effect of calcium deposits on the corrosion of Cu-Ni alloy was gradually enhanced.In the dynamic experiment,24 h real-time monitoring of the corrosion and scaling process of Cu-Ni alloy was conducted.The experimental results show that the water temperature changes only have an effect on copper and nickel alloy pitting corrosion rate,with the increase of water temperature B30 copper nickel alloy corrosion speed first increases then decreases,scale and speed increase with the decrease of the first,and the induction period also gradually become shorter.Water velocity variation mainly pitting corrosion rate of copper and nickel alloy and early will appear as the velocity of the phenomenon of larger corrosion rate gradually quickens,decreases as the velocity of B30 copper nickel alloy corrosion speed after the first increase sharply reduced,and the fouling resistance increase with the decrease of the first,and the induction period extended gradually along with the increase of water flow.At the same time,the change of the heat flux is mainly caused B30 copper nickel alloy pitting rate,but when the heat flux density of more than 1000 w?m-2 will affect the corrosion rate of copper and nickel alloy,corrosion speed after the first increase with the increase of heat flux density of the trend of flat,and the fouling resistance presents a trend of increase with the decrease of the first,at the same time with the increase of heat flux density scale layer induction period gradually become shorter.Full scale formed in the dynamic experiments for B30 copper nickel alloy corrosion under the scale of all have certain protective effect,but under the condition of the heat flux density of 1000 w/m2 loose calcareous sediments during early boost local pitting corrosion rate of copper and nickel alloy.