{"id":1050,"date":"2021-08-16T14:53:00","date_gmt":"2021-08-16T06:53:00","guid":{"rendered":"https:\/\/cryost.cn\/?p=1050"},"modified":"2021-08-31T14:56:46","modified_gmt":"2021-08-31T06:56:46","slug":"%e5%be%90%e6%94%80%e7%9a%84%e8%ae%ba%e6%96%87%e8%a2%abcryogenics%e6%8e%a5%e6%94%b6","status":"publish","type":"post","link":"https:\/\/cryost.cn\/?p=1050","title":{"rendered":"\u5f90\u6500\u7684\u8bba\u6587\u88abCryogenics\u63a5\u6536"},"content":{"rendered":"\n<p style=\"font-size:18px\"><strong>Cryogenics<\/strong><br>2021<\/p>\n\n\n\n<p class=\"has-vivid-cyan-blue-color has-text-color\" style=\"font-size:18px\"><strong><a href=\"https:\/\/www.sciencedirect.com\/science\/article\/pii\/S0011227521001090?via%3Dihub\" data-type=\"URL\" data-id=\"https:\/\/www.sciencedirect.com\/science\/article\/pii\/S0011227521001090?via%3Dihub\" target=\"_blank\" rel=\"noreferrer noopener\">Numerical investigation on serrated fin of sub-atmosphere plate-fin heat exchanger used in superfluid helium system<\/a><\/strong><\/p>\n\n\n\n<p>Pan Xu<sup>a<\/sup>, Jian Wen<sup>a<\/sup>, Xin Zhao<sup>a<\/sup>, Hongwei Hao<sup>a<\/sup>, Simin Wang<sup>b<\/sup>, Yanzhong Li<sup>a<\/sup><br><sup>a<\/sup>School of Energy and Power Engineering, Xi &#8216;an Jiaotong University, Xi\u2019an 710049, Shaanxi, China<br><sup>b<\/sup>School of Chemical Engineering and Technology, Xi &#8216;an Jiaotong University, Xi\u2019an 710049, Shaanxi, China<\/p>\n\n\n\n<h5 class=\"wp-block-heading\" style=\"font-size:18px\">\u6458\u8981\uff1a<\/h5>\n\n\n\n<p style=\"font-size:18px\">A mathematical model is developed to investigate the effects of working media, operating conditions and fin structural parameters on the flow and heat transfer performance of sub-atmospheric and low-temperature helium in serrated fin. For helium, nitrogen and air, when the Reynolds number (<em>Re<\/em>) is less than 2500, the Colburn heat transfer factor (<em>j<\/em>\u00a0factor) of helium is in the middle, while that is the lowest when\u00a0<em>Re<\/em>\u00a0is higher than 2500. The Fanning friction factor (<em>f<\/em>\u00a0factor) of helium under the working condition is much higher than those of air and nitrogen under corresponding working conditions. The results show that short fin height is selected for high\u00a0<em>Re<\/em>\u00a0and high fin height is selected for low\u00a0<em>Re.<\/em>\u00a0The overall performance can be improved by increasing the fin spacing and decreasing the fin thickness. Small fin length can improve the overall performance, but the effect is poor at high\u00a0<em>Re<\/em>. The Kriging response surface is used to fit the flow and heat transfer correlations of serrated fin. The fitting degrees of\u00a0<em>j<\/em>\u00a0and\u00a0<em>f<\/em>\u00a0factors are 0.963 and 0.978 respectively, and the average relative errors are 4.31% and 8.79% respectively. The two correlations have good prediction performance, which can provide a theoretical reference for the design of sub-atmospheric and low-temperature plate-fin\u00a0heat exchanger.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Numerical investigation on serrated fin of sub-atmosphere plate-fin heat exchanger used in superfluid helium system<\/p>\n","protected":false},"author":1,"featured_media":607,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[],"_links":{"self":[{"href":"https:\/\/cryost.cn\/index.php?rest_route=\/wp\/v2\/posts\/1050"}],"collection":[{"href":"https:\/\/cryost.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cryost.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cryost.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/cryost.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1050"}],"version-history":[{"count":0,"href":"https:\/\/cryost.cn\/index.php?rest_route=\/wp\/v2\/posts\/1050\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cryost.cn\/index.php?rest_route=\/wp\/v2\/media\/607"}],"wp:attachment":[{"href":"https:\/\/cryost.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1050"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cryost.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1050"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cryost.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1050"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}