Numerical study on heat transfer enhancement for use of corrugated,nodal and horizontal grain tubes

With isopentane as working fluid, the heat transfer performances for corrugated, nodal and horizontal grain tubes are simulated. The structural parameters of the three kinds of tubes are compared with those of the plain tube. The numerical results using computational fluid dynamics are validated with theoretical values. For the corrugated, nodal and horizontal grain tubes, the heat transfer enhancements(HTEs) are 2.31—2.53, 1.18—1.86 and 1.02—1.31 times of those of the plain tube, respectively. However, the improved HTEs are at the expense of pressure losses. The drag coefficients are 6.10—7.09, 2.06—11.03 and 0.53—1.83 higher, respectively. From the viewpoint of comprehensive heat transfer factor, the corrugated tube is recommended for engineering applications, followed by the horizontal grain tube.     

THE SIMILARITIES AND DIFFERENCES IN STYLE BETWEEN TW0 NEWS REP0RTS——THE STYLISTIC FEATURES 0F NEWSPAPER REP0RTS

Different newspapers have different features and styles, which are mainly defined by thesort the paper belongs to. A and B are two treatments of the same event (Southhall tragedyin England) by two different newspapers——The Daily Telegraph and The daily Mirror, theformer being a quality paper in support of the Conservative Party and the latter a popular oneon the side of the Laber Party. There are both similarities and differences in style betweenthe two news reports.     

爱的词汇

“You are the sunshine of my life.” Has anyone eversaid that to you?Unfortunately,the words we usefor the ones we love are much more ordinary.Disappointingly ordinary,in fact.But—just asthey say the art of a good joke is in the telling—it all dependson who the magic words come from. The most common words we are darling,sweetheart,pet,dear,and love-certainly between couples who havebeen together for some time.For boyfriends and girlfriends,     

阅读理解四则(英文)

(A)Every day we go to school and listen to teachers, and the teacherwill ask us some questions. Sometimes, the classmates will ask youropinions of the work of the class. When you are telling others in the classwhat you have found out about these topics, remember that they must beable to hear what you are saying. You are not taking part in a family con-versation or having a chat with friends——you are in a situation where alarge group of people will remain silent, waiting to hear what you have…     

Men women and internet

Women are now as likely to use the Internet as men — about two-thirds of both genders — yet new study shows that gaps remain in what each sex does online. American men who go online are more likely than women to check the weather, the news, sports polit…     

学会享受生活

To a large degree,the measure of our peace of mind is determined by how much we are able to live in the present moment.Irrespective of what happened yesterday or last year,and what may or may not happen tomorrow,the present moment is where you are——always.     

Regional Identity and National Identity

Identity is the crucial characteristic to people, as it is the defining factors of what they are and what they are not. It concludes lots of things, and among which, the national identity and regional identity are the most important ones; though they are often confused in some occasions. Therefore, this essay discusses the question of the relationship of these two identities with the examples of two British films— Bloody Sunday and Kes. From the discussion, it concludes that though on some degree the region...     

An Analysis of Fictional Dialogues of Love in a Fallen City in the Light of Relevance Theory

Although literary works are imaginary,they are based on careful observations of the real world.The fictional world is an imitation of the real world.So there is a strong similarity between them.The character utterances in fictions may be artificial in reality,but they are true in fictions.Therefore,pragmatic theories also have validity for literary interaction in theory.The au thor analyzes the fictional dialogues in Eileen Chang’ s novel——Love in a Fallen City under the framework of the communica tion model based on Relevance Theory.In the academic field,Relevance Theory has been applied to explain a wide range of phenomena in translation,stylistics,phonology,and English teaching.However,the researches on mass communication discourse are still on the development.     

Shish Ka Bob

Are you ready to makea nice ShiSh Ka Bob？ The words of the Shish Kabb issue are——     

口语加油站

【知识结构】A. Let's... B.—Why do you...?—Because... C.—Where are ... from?—They are from ...【重点热点】Let's see the koalas first. /Why do you