东南大学学报(自然科学版)
東南大學學報(自然科學版)
동남대학학보(자연과학판)
JOURNAL OF SOUTHEAST UNIVERSITY
2014年
5期
989-992
,共4页
温度阶跃%粗糙%纳通道%分子动力学模拟
溫度階躍%粗糙%納通道%分子動力學模擬
온도계약%조조%납통도%분자동역학모의
temperature jump%rough%nanochannel%molecular dynamics simulation
建立了粗糙纳通道内液体热传导的分子动力学模型,模拟研究了纳通道内液体的温度分布和液固界面处的温度阶跃现象,获得了液固相互作用强度、表面粗糙高度和壁面刚度对界面处温度阶跃的影响规律。研究结果表明:在固体壁面附近,液体温度偏离了线性分布,液固界面处出现了温度阶跃。与光滑表面相比,粗糙度的存在降低了液固界面处的温度阶跃程度。粗糙高度的增加扩大了液固相互作用面积,延长了近壁面附近的液体分子与固体之间的能量交换时间,强化了液固界面的能量传递,从而使得界面处温度阶跃降低。另外,提高液固相互作用强度或者降低固壁刚度均可使液固界面处温度阶跃程度减小。
建立瞭粗糙納通道內液體熱傳導的分子動力學模型,模擬研究瞭納通道內液體的溫度分佈和液固界麵處的溫度階躍現象,穫得瞭液固相互作用彊度、錶麵粗糙高度和壁麵剛度對界麵處溫度階躍的影響規律。研究結果錶明:在固體壁麵附近,液體溫度偏離瞭線性分佈,液固界麵處齣現瞭溫度階躍。與光滑錶麵相比,粗糙度的存在降低瞭液固界麵處的溫度階躍程度。粗糙高度的增加擴大瞭液固相互作用麵積,延長瞭近壁麵附近的液體分子與固體之間的能量交換時間,彊化瞭液固界麵的能量傳遞,從而使得界麵處溫度階躍降低。另外,提高液固相互作用彊度或者降低固壁剛度均可使液固界麵處溫度階躍程度減小。
건립료조조납통도내액체열전도적분자동역학모형,모의연구료납통도내액체적온도분포화액고계면처적온도계약현상,획득료액고상호작용강도、표면조조고도화벽면강도대계면처온도계약적영향규률。연구결과표명:재고체벽면부근,액체온도편리료선성분포,액고계면처출현료온도계약。여광활표면상비,조조도적존재강저료액고계면처적온도계약정도。조조고도적증가확대료액고상호작용면적,연장료근벽면부근적액체분자여고체지간적능량교환시간,강화료액고계면적능량전체,종이사득계면처온도계약강저。령외,제고액고상호작용강도혹자강저고벽강도균가사액고계면처온도계약정도감소。
The molecular dynamics model is established to simulate the heat conduction of liquid in a rough nanochannel so as to investigate the temperature distribution of liquid in nanochannel and the interfacial temperature jump.The effects of liquid-solid interaction,roughness height and wall stiff-ness on the temperature jump are analyzed.The results indicate that the temperature profile deviates from the linear fashion in the wall-neighboring region,and the temperature jump is observed at the rough solid surface.Compared with the smooth surface,the presence of the roughness decreases the temperature jump length at the boundary.A larger roughness height increases the contact area be-tween the liquid and the solid,which enhances the energy transfer at liquid-solid interface and hence decreases the temperature jump.In addition,the increase in liquid-solid interaction strength or reduc-tion in wall stiffness leads to a smaller temperature jump length.