哈尔滨工程大学学报
哈爾濱工程大學學報
합이빈공정대학학보
JOURNAL OF HARBIN ENGINEERING UNIVERSITY
2015年
4期
494-499
,共6页
纳米流体%界面层%热导率%纳米颗粒%传热
納米流體%界麵層%熱導率%納米顆粒%傳熱
납미류체%계면층%열도솔%납미과립%전열
nanofluids%interfacial nanolayer%thermal conductivity%nanoparticle%heat transfer
受分子间作用力的影响,纳米颗粒表面附近的液体分子排列比较紧密,形成界面层。为了深入研究界面层对纳米流体热导率的影响,对比分析了考虑界面层效应的纳米流体热导率模型,讨论了界面层热导率、界面层厚度以及纳米颗粒尺寸对纳米流体热导率的影响。研究结果表明,界面层能够提高纳米流体的热导率,并且界面层热导率与厚度是影响纳米流体热导率的重要因素,尤其当纳米颗粒体积分数较高,纳米颗粒尺寸较小时,2种因素的影响更加明显。此外,受界面层厚度的影响,界面层热导率对纳米流体热导率的影响程度随着界面层厚度的增加而升高。
受分子間作用力的影響,納米顆粒錶麵附近的液體分子排列比較緊密,形成界麵層。為瞭深入研究界麵層對納米流體熱導率的影響,對比分析瞭攷慮界麵層效應的納米流體熱導率模型,討論瞭界麵層熱導率、界麵層厚度以及納米顆粒呎吋對納米流體熱導率的影響。研究結果錶明,界麵層能夠提高納米流體的熱導率,併且界麵層熱導率與厚度是影響納米流體熱導率的重要因素,尤其噹納米顆粒體積分數較高,納米顆粒呎吋較小時,2種因素的影響更加明顯。此外,受界麵層厚度的影響,界麵層熱導率對納米流體熱導率的影響程度隨著界麵層厚度的增加而升高。
수분자간작용력적영향,납미과립표면부근적액체분자배렬비교긴밀,형성계면층。위료심입연구계면층대납미류체열도솔적영향,대비분석료고필계면층효응적납미류체열도솔모형,토론료계면층열도솔、계면층후도이급납미과립척촌대납미류체열도솔적영향。연구결과표명,계면층능구제고납미류체적열도솔,병차계면층열도솔여후도시영향납미류체열도솔적중요인소,우기당납미과립체적분수교고,납미과립척촌교소시,2충인소적영향경가명현。차외,수계면층후도적영향,계면층열도솔대납미류체열도솔적영향정도수착계면층후도적증가이승고。
Due to the effects between molecular interactions, the liquid molecules close to a nanoparticle surface can arrange closely together.This compact structure of liquid molecules at the interface is often called interfacial nano-layer.In order to further study the effects of the interfacial nanolayer on the thermal conductivity of nanofluids, dif-ferent thermal conductivity models considering interfacial nanolayer for nanofluids are analyzed contrastively in this paper.Several parameters such as thermal conductivity of interfacial nanolayer, interfacial nanolayer thickness and nanoparticle size are discussed.The results showed that the interfacial nanolayer can improve the thermal conductiv-ity of nanofluids.Based on the investigation, it is also found that the thermal conductivity and thickness of the inter-facial nanolayer are important factors affecting thermal conductivity of nanofluids and the effects are very significant when the nanoparticle volume fraction is larger and nanoparticle size is smaller.Affected by interfacial nanolayer thickness, the effects of the interfacial nanolayer thermal conductivity on the thermal conductivity of nanofluids can be more obvious with the increase of interfacial nanolayer thickness.