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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Experimental investigation on pool boiling mechanism of two-level gradient metal foams in deionized water, aqueous surfactant solutions and polymeric additive solutions
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Experimental investigation on pool boiling mechanism of two-level gradient metal foams in deionized water, aqueous surfactant solutions and polymeric additive solutions

机译：去离子水，表面活性剂溶液和聚合物添加剂溶液中两级梯度金属泡沫池沸腾机理的实验研究

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摘要

In the present study, metal skeleton temperature, bubble growth, pool boiling curves, and the solid-liquid static contact angle of two-level gradient foams have been experimentally investigated in deionized water, aqueous surfactant solutions and polymeric additive solutions under atmospheric pressure. The surfactant is Triton X-100 and the polymeric additive is polyvinyl pyrrolidone. A two-level gradient foam sample is made by a uniform copper foam layer, a uniform nickel foam layer and a copper plate with the thickness of 2 mm. The pore densities of uniform foams are 5 PPI, 20 PPI and 40 PPI. The foam porosity is fixed as 0.98. The experimental results show that, foam layer position reversal has a great effect on pool boiling heat transfer of the gradient foam. The pool boiling heat transfer rate of the gradient nickel-copper foam increases with increasing bottom foam pore density. The temperature of corner skeleton on the upper surface of the gradient foam is higher than that of inner skeleton because of the heat flow from escaping bubbles by collision, cutting, stagnation, etc. The metal skeleton temperature is heavily affected by the additives of Triton X-100 and polyvinyl pyrrolidone due to the variations of the solid-liquid contact angles.
机译：在本研究中，金属骨架温度，气泡生长，池沸腾曲线和两级梯度泡沫的固体静态静态接触角在大气压下的去离子水，水性表面活性剂溶液和聚合物添加剂溶液中进行了实验研究。表面活性剂是Triton X-100，聚合物添加剂是聚乙烯吡咯烷酮。双层梯度泡沫样品由均匀的铜泡沫层，均匀的镍泡沫层和厚度为2mm的铜板制成。均匀泡沫的孔密度为5 ppi，20 ppi和40 ppi。泡沫孔隙率固定为0.98。实验结果表明，泡沫层位置反转对梯度泡沫的池沸腾热传递具有很大的效果。随着底部泡沫孔密度的增加，梯度镍铜泡沫的池沸腾的传热速率增加。由于通过碰撞，切割，停滞等从逸出，梯度泡沫的上表面上的角骨架温度高于内骨架的温度。金属骨架温度受到Triton x的添加剂的严重影响-100和聚乙烯吡咯烷酮由于固液接触角的变化。

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