化工学报
化工學報
화공학보
JOURNAL OF CHEMICAL INDUSY AND ENGINEERING (CHINA)
2014年
8期
2921-2926
,共6页
泡沫金属%等效热导率%模型%预测%传热%测量
泡沫金屬%等效熱導率%模型%預測%傳熱%測量
포말금속%등효열도솔%모형%예측%전열%측량
metal foam%effective thermal conductivity%model%prediction%heat transfer%measurement
提出一种针对泡沫金属等效热导率预测的新模型，该模型基于泡沫金属Kelvin十四面体元胞结构建模，以凹面三棱柱近似金属韧带，并考虑韧带交汇处的结点特点，通过热阻分析得到计算等效热导率的表达式。研究表明：该模型对充填不同介质的不同材质泡沫金属等效热导率均有较高的预测精度（平均偏差均小于10%），与文献其他半经验模型相比能更好兼顾预测精确性和通用性。
提齣一種針對泡沫金屬等效熱導率預測的新模型，該模型基于泡沫金屬Kelvin十四麵體元胞結構建模，以凹麵三稜柱近似金屬韌帶，併攷慮韌帶交彙處的結點特點，通過熱阻分析得到計算等效熱導率的錶達式。研究錶明：該模型對充填不同介質的不同材質泡沫金屬等效熱導率均有較高的預測精度（平均偏差均小于10%），與文獻其他半經驗模型相比能更好兼顧預測精確性和通用性。
제출일충침대포말금속등효열도솔예측적신모형，해모형기우포말금속Kelvin십사면체원포결구건모，이요면삼릉주근사금속인대，병고필인대교회처적결점특점，통과열조분석득도계산등효열도솔적표체식。연구표명：해모형대충전불동개질적불동재질포말금속등효열도솔균유교고적예측정도（평균편차균소우10%），여문헌기타반경험모형상비능경호겸고예측정학성화통용성。
A new model for calculating effective thermal conductivities of different metal foams is proposed based on an appropriate geometrical modeling method. The geometrical modeling is based on the representative cell geometry of metal foam, Kelvin tetrakaidecahedron, and the foam ligament is geometrically represented by concave tri-prism. The characteristic of foam node is also taken into account in the model. A general expression for calculating effective thermal conductivity is derived from thermal resistance analysis. In the present model, no geometrical parameter needs to be determined through experiments to describe the relationship between foam ligament and node. Compared with available experimental data and semi-empirical models in literature, the present model can accurately predict the effective thermal conductivities of different metal foams saturated with different mediums, with the average relative deviations from the experimental data within 10%. Considering both accuracy and generality, the present model is superior to existing semi-empirical models.
