Abstract
Conically corrugated tube is a new type of high-efficiency heat exchange tube. In this paper, the mechanical and heat transfer properties of conically corrugated tubes formed by the cold rolling of smooth tubes are studied through experimental measurement and numerical simulation to lay the foundations for applying the tubes in heat exchangers. The results show that while conically corrugated tube has a lower axial elastic stiffness compared with smooth tube, conically corrugated tube has a higher yield strength and ultimate strength. Unlike smooth tubes, conically corrugated tubes develop three-dimensional stresses when an axial tensile load is applied to them. In addition, the heat transfer coefficient of conically corrugated tube is 15%, 17%, and 115% higher than that of spiral grooved tube, convergent divergent tube, and smooth tube, respectively. Finally, the correlation equations of the axial stress concentration factor, stiffness equivalent coefficient, Nusselt number, and flow resistance coefficient of conically corrugated tubes are obtained for engineering application.
Highlights
Passive heat transfer enhancement technology [1,2] is the most commonly used method of enhancing heat transfer in heat exchangers
The results showed that the heat transfer coefficient and flow resistance of the spirally corrugated tubes increased by 50–80% and 50–300% compared with the smooth spiral tube due to an additional rotation motion
The results showed that the heat transfer coefficient and pressure drop of corrugated tubes increased by 22% and 19% compared with straight tubes, respectively
Summary
Passive heat transfer enhancement technology [1,2] is the most commonly used method of enhancing heat transfer in heat exchangers. Özden et al [6] studied the heat transfer performance in corrugated tube using experimental and numerical simulation methods and compared it with spiral finned tube. The results showed that the heat transfer coefficient and flow resistance of the spirally corrugated tubes increased by 50–80% and 50–300% compared with the smooth spiral tube due to an additional rotation motion. Using both experimental and numerical simulation, Laohalertdecha et al [11] studied the flow and heat transfer performance of corrugated tubes with R-134a as the medium. Tvhiberraetsiounltsasnhdowanedaxthiaalt cwohmepnrtehsesitointanloiuadm, tmubaenywainstseurgbrjaecntueldarto crflacukids winedruecperdodvuibcreadtiionnaacnidrcuanmafexrieanl tcioaml dpirreescstiioonn rloesaudl,timnganfryoimntceorgmrapnousiltaersctrraecsks.s were proCdounceicdalilnyacocirrrcuugmatfeedrentutibael disiraecnteiown tryepsueltoifnghifgrho-mefcfiocmienpcoysitheesattreesxsc.hange tube proposed Cbyonthiceaalluythcoorr.ruIngaotreddertutobelaiys tahenefowuntydpaetioonf shifgohr -tehfefiacpiepnlcicyahtieoantoefxccohnaincgaellytucboerrpur-ogaptoedsetdubbeys tihneenaugitnheoerr. inIgn, othrde emr etcohlaanyictahleanfoduhnedaatttiroannssffeorr ptrhoepaeprtpieliscoatfiothne otuf bceonwicearelly stucodrireudgeaxtepdertiumbeenstianlleynagnindeenruinmge,rtihcaellmy.ecShpaenciifciaclaallnyd, thheeaat xtriaalnbsfeearripnrgopcearptaiecsitoyfatnhde tfuab- e tigwueerestsrteundgitehdoefxcpoenriicmaellnytaclolryruangdatnedumtuebreicwalelyr.eSsptuecdiifiecda.lHly,etahtetraaxniasflebrepaerirnfogrcmaapnacceitywaansd infvaetisgtiugeatsetrdenngutmh eorficcaolnlyicaalnlyd ccoormrupgaarteeddwtuibthe owthereer sHtuEdHieEdt.uHbeeast. transfer performance was investigated numerically and compared with other HEHE tubes
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