Technical Note A heat transfer and friction correlation for wavy fin-and-tube heat exchangers.pdfVIP

下载本文档

13
0
约9.81千字
约 6页
2017-04-11 发布于江苏
举报
版权申诉

Technical Note A heat transfer and friction correlation for wavy fin-and-tube heat exchangers.pdf

1、有哪些信誉好的足球投注网站（book118）网站文档一经付费（服务费），不意味着购买了该文档的版权，仅供个人/单位学习、研究之用，不得用于商业用途，未经授权，严禁复制、发行、汇编、翻译或者网络传播等，侵权必究。。
2、本站所有内容均由合作方或网友上传，本站不对文档的完整性、权威性及其观点立场正确性做任何保证或承诺！文档内容仅供研究参考，付费前请自行鉴别。如您付费，意味着您自己接受本站规则且自行承担风险，本站不退款、不进行额外附加服务；查看《如何避免下载的几个坑》。如果您已付费下载过本站文档，您可以点击这里二次下载。
3、如文档侵犯商业秘密、侵犯著作权、侵犯人身权等，请点击“版权申诉”（推荐），也可以打举报电话：400-050-0827(电话支持时间：9:00-18:30)。
4、该文档为VIP文档，如果想要下载，成为VIP会员后，下载免费。
5、成为VIP后，下载本文档将扣除1次下载权益。下载后，不支持退款、换文档。如有疑问请联系我们。
6、成为VIP后，您将拥有八大权益，权益包括：VIP文档下载权益、阅读免打扰、文档格式转换、高级专利检索、专属身份标志、高级客服、多端互通、版权登记。
7、VIP文档为合作方或网友上传，每下载1次，网站将根据用户上传文档的质量评分、类型等，对文档贡献者给予高额补贴、流量扶持。如果你也想贡献VIP文档。上传文档

Technical Note A heat transfer and friction correlation for wavy fin-and-tube heat exchangers

\ PERGAMON International Journal of Heat and Mass Transfer 31 0888# 0808D0813 9906D8209:87:, ! see front matter T 0887 Elsevier Science Ltd[ All rights reserved PII] S 9 9 0 6 D 8 2 0 9 8 7 # 9 9 1 7 7 D 8 Technical Note A heat transfer and friction correlation for wavy _n!and! tube heat exchangers C[!C[ Wanga\\ J[!Y[ Jangb\ N[!F[ Chioub a Ener`y and Resources Laboratories\ Industrial Technolo`y Research Institute\ Hsinchu\ Taiwan\ Republic of China b Department of Mechanical En`ineerin`\ National Chen`!Kun` University\ Tainan\ Taiwan\ Republic of China Received 01 April 0887 Nomenclature Ac minimum free!~ow area em1? Af _n surface area em1? At tube surface area em1? A9 total surface area em1? Dc _n collar outside diameter\ D9|1df em? Dh hydraulic diameter\ 3AcL:A9 em? f friction factor\ dimensionless Fp _n pitch em? Gc mass ~ux of the air based on the minimum ~ow area ekg m?1 s?0? h heat transfer coe.cient eW m?1 K?0? j Nu:Re Pr0:2\ the Colburn factor\ dimensionless k thermal conductivity eW m?0 K?0? L depth of the heat exchanger em? N number of longitudinal tube rows\ dimensionless NTU UA:Cmin\ number of transfer units\ dimensionless DP pressure drop ePa? Pl longitudinal tube pitch em? Pd wa/e height em? Pt transverse tube pitch em? Pr Prandtl number\ dimensionless ReDc Reynolds number based on tube collar diameter\ dimensionless S _n spacing em? Xf projected _n length em?[ Greek symbols o Qt:Qtmax\ heat exchanger e}ectiveness\ dimensionless u corrugation angle e? df _n thickness em? Corresponding author[ Tel[] 99 775 2 4805183^ fax] 99 775 2 4719149^ e!mail] ccwangYerl[itri[org[tw m dynamic viscosity of ~uid ekg m?0 s?0? r mass density of ~uid ekg m?2? s contraction ratio of cross!sectional area\ dimen! sionless[ Subscripts air air side i tube side f _n surface 9 total surface 0 inlet 1 outlet[ 0[ Introduction Finned tube heat exchangers are widely used in a var! iety of applications in the air!conditioning\ refrigeration\ and process industry[ Generally\ the