Thermal performance analysis of non-uniform height rectangular fin based on constructal theory and e

来源 :Science China(Technological Sciences) | 被引量 : 0次 | 上传用户:fengxuemin
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
A model of non-uniform height rectangular fin, in which the variation of base’s thickness and width are taken into account, is established in this paper. The dimensionless maximum thermal resistance(DMTR) and the dimensionless equivalent thermal resistance(DETR) defined based on the entransy dissipation rate(EDR) are taken as performance evaluation indexes. According to constructal theory, the variations of the two indexes with the geometric parameters of the fin are analyzed by using a finite-volume computational fluid dynamics code, the effects of the fin-material fraction on the two indexes are analyzed. It is found that the two indexes decrease monotonically as the ratio between the front height and the back height of the fin increases subjected to the non-uniform height rectangular fin. When the model is reduced to the uniform height fin, the two indexes increase first and then decrease with increase in the ratio between the height of the fin and the fin space. The fin-material fraction has no effect on the change rule of the two indexes with the ratio between the height of the fin and the fin space. The sensitivity of the DETR to the geometric parameters of the fin is higher than that of the DMTR to the geometric parameters. The results obtained herein can provide some theoretical support for the thermal design of rectangular fins. A model of non-uniform height rectangular fin, in which the variation of base’s thickness and width are taken into account, is established in this paper. The dimensionless maximum thermal resistance (DMTR) and the dimensionless equivalent thermal resistance (DETR) defined based on the entransy dissipation rate (EDR) are taken as performance evaluation indexes. the variations of the two indexes with the geometric parameters of the fin are using by a finite-volume computational fluid dynamics code, the effects of the fin it is found that the two indexes decrease monotonically as the ratio between the front height and the back height of the fin increases to the non-uniform height rectangular fin. When the model is reduced to the uniform height fin, the two indexes increase first and then decrease with increase in the ratio between the height of the fin and the fin space. The fin-material fr action has no effect on the change rule of the two indexes with the ratio between the height of the fin and the fin space. The sensitivity of the DETR to the geometric parameters of the fin is higher than that of the of DMTR to the geometric parameters. The results obtained herein can provide some theoretical support for the thermal design of rectangular fins.
其他文献
20世纪60-70年代,永春县第一中学一名普通的地理教师——刘心村,经无数次现场勘测、科学论证,富有胆识地、多次向福建省政府及晋江地区行署提出“在德化县龙门滩截引闽北水系
1955年12月24日“人民日报”刊登了丁伟志、李学昆、高禹集体写作的评华岗的“辩证唯物论大纲”的书评。书评首先指出“这是一本利用宣传辩证唯物主义反对唯心主义的学习运
This Letter presents the fabrication and characterization of a perylene(Per) and Rhodamine 6 G(Rh 6 G)co-doped polymeric fiber. The spectroscopic properties(lum
一、规模化苗圃建设工作进展2015年是决定10万亩规模化苗圃建设总体质量和水平的关键一年,一年来,北京市种苗站按照《关于加快平原地区规模化苗圃发展的意见》要求及全市平原
11岁学习举重,叱咤风云十数年的奥运冠军陈小敏,走过了运动员、大学生、党代表的路程。今天,她以羊城晚报报业集团团委书记的身份接受我们的采访。 11-year-old to learn we
(2016年3月14日)这次会议的主要任务是深入贯彻落实《中共中央、国务院关于印发和的通知》(中发〔2015〕6号)和《自治区党委、政府关于印发的通知》(宁党发〔2016〕8号)精神,
在未来的高频系统芯片,特别是片上网络的设计中,知识产权模块之间的联系至为关键,而单壁纳米碳管则是其中一种很有前景的纳米结构。电路及系统尺寸的不断缩减限制了对1000 GH
2008年7月,高中毕业的我由于种种原因进入一家公司开始了打字员的生涯。小公司业务少,主办会计是兼职的,每周只来公司一次。每次主办会计来的时候,公司老板对她都恭敬有加,作
激光烧蚀冲量耦合特性是激光清除空间碎片的基础,高精度的冲量测量方法是研究冲量耦合特性的必须手段。以扭摆系统测量激光烧蚀空间碎片产生的冲量为背景,分析扭摆法测量原理
孙锟教授,男,1964年出生,浙江省临海市人,中共党员,1985年毕业于温州医学院儿科系。 孙锟同志大学毕业后曾在温州医学院第二附属医院儿内科工作;1990年获上海第二医科大学医