# OPTIMIZATION ANALYSIS FOR LOUVER-FINNES HEAT EXCHANGERS

A series of 3-D computational fluid dynamics analyses along with the simplified conjugate-gradient
method were carried out to study the thermal-hydraulic characteristics for the louver-finned heat exchanger. The
effects of different louver angles (? = 20o to 28o), and louver pitches (Lp = 0.8 to 1.2 mm) on the heat transfer
phenomenon and pressure drop (in terms of Colburn j factor and friction f factor) were investigated in detail. The
optimization of the louver angle and louver pitch is carried out by using the simplified conjugate-gradient
method. The area reduction ratio using a louver fin relative to the plain surface is the objective function to be
maximized. The numerical results showed that both the f and j factors are increased with the increase of the
louver angle; while, for a given louver angle, as the louver pitch (Lp) is creased, both the f and j factors are
increased. It is also found that, under the optimum conditions, the area reduction ratio could reach up to 28 % to 37% with Reynolds number (based on the fin pitch ) ReFp ranging from 400 to 1600.
{"ft_lang_label":"__label__en","ft_lang_prob":0.9258764,"math_prob":0.79395187,"size":1150,"snap":"2021-43-2021-49","text_gpt3_token_len":285,"char_repetition_ratio":0.12390925,"word_repetition_ratio":0.031746034,"special_character_ratio":0.22086957,"punctuation_ratio":0.0754717,"nsfw_num_words":0,"has_unicode_error":false,"math_prob_llama3":0.95979017,"pos_list":[0],"im_url_duplicate_count":[null],"WARC_HEADER":"{\"WARC-Type\":\"response\",\"WARC-Date\":\"2021-10-23T07:38:06Z\",\"WARC-Record-ID\":\"<urn:uuid:579f6502-fb44-48b3-993c-f31164eaf227>\",\"Content-Length\":\"20291\",\"Content-Type\":\"application/http; msgtype=response\",\"WARC-Warcinfo-ID\":\"<urn:uuid:85340871-6730-4cb8-8b34-9ae4ba168fda>\",\"WARC-Concurrent-To\":\"<urn:uuid:f40199e1-3606-4209-a016-279729e6a92b>\",\"WARC-IP-Address\":\"91.201.60.15\",\"WARC-Target-URI\":\"https://heatpumpingtechnologies.org/publications/optimization-analysis-for-louver-finnes-heat-exchangers/\",\"WARC-Payload-Digest\":\"sha1:6VGXSXPBO5LTP4WQ6LOIMGU2SHTHBMR2\",\"WARC-Block-Digest\":\"sha1:FNIRMWEC3TOVZFSMHDROSUKFA632DN7D\",\"WARC-Identified-Payload-Type\":\"text/html\",\"warc_filename\":\"/cc_download/warc_2021/CC-MAIN-2021-43/CC-MAIN-2021-43_segments_1634323585653.49_warc_CC-MAIN-20211023064718-20211023094718-00502.warc.gz\"}"}