\n Is\u0131 Aktar\u0131m\u0131, Alm.V\u00e4rmeleitung (f), Fr. transformation de chaleur, \u0130ng. Heat transfer.Is\u0131 enerjisinin bir yerden ba\u015fka bir yere aktar\u0131ld\u0131\u011f\u0131 \u00e7e\u015fitli projelerin (s\u00fcre\u00e7lerin veya ameliyelerin) ortak ad\u0131. Farkl\u0131 s\u0131cakl\u0131klardaki iki cisim yanyana geldi\u011fi zaman y\u00fcksek s\u0131cakl\u0131ktaki cisimlerden d\u00fc\u015f\u00fck s\u0131cakl\u0131ktaki cisme enerji ak\u0131\u015f\u0131 olur.Cisimler termal dengeye ula\u015f\u0131ncaya (ayn\u0131 s\u0131cakl\u0131\u011fa gelinceye) kadar \u0131s\u0131 ak\u0131\u015f\u0131 dev\u00e2m eder. Bu olay \u0131s\u0131n\u0131n bir yerden bir yere transferi veya aktar\u0131m\u0131 olarak tan\u0131mlan\u0131r.Is\u0131n\u0131n bir cisimden ba\u015fka bir cisme transferi \u00fc\u00e7 ayr\u0131 \u015fekilde vuk\u00fb bulur. Bunlar kond\u00fcksiyon, konveksiyon ve radyasyonla transferdir.
\n Kond\u00fcksiyonla transfer (\u0131s\u0131 iletimi):Bir cismin kom\u015fu b\u00f6lgeleri aras\u0131ndaki s\u0131cakl\u0131k farklar\u0131n\u0131n etkisiyle geli\u015fen \u0131s\u0131 transferi. Is\u0131l iletkenlik, iletken ortamdaki kom\u015fu molek\u00fcller ve elektronlar aras\u0131ndaki enerji al\u0131\u015fveri\u015fine ba\u011flan\u0131r. Bir \u00e7ubukta \u0131s\u0131n\u0131n ak\u0131\u015f h\u0131z\u0131, \u00e7ubu\u011fun kesit alan\u0131 ve iki ucu aras\u0131ndaki s\u0131cakl\u0131k fark\u0131yla do\u011fru, uzunlu\u011fuyla da ters orant\u0131l\u0131d\u0131r. Bunu ifade eden ba\u011f\u0131nt\u0131 \u015f\u00f6yle g\u00f6sterilebilir: <\/p>\n
\u011fQ \/ \u011ft = – k(A\/1) (T2 – T1). Burada \u011fQ \/ \u011ft \u0131s\u0131n\u0131n ak\u0131\u015f h\u0131z\u0131 (y\u00e2ni birim zamanda transfer olan \u0131s\u0131 miktar\u0131); k, malzemenin \u0131s\u0131l iletkenli\u011fini g\u00f6steren kond\u00fcksiyon katsay\u0131s\u0131; A, \u00e7ubu\u011fun kesit alan\u0131; l \u00e7ubu\u011fun uzunlu\u011fu; T2 – T1 ise, \u00e7ubu\u011fun u\u00e7lar\u0131 aras\u0131ndaki s\u0131cakl\u0131k fark\u0131d\u0131r. <\/p>\n
Is\u0131l iletkenli\u011fi (k) b\u00fcy\u00fck olan bir malzeme \u0131s\u0131y\u0131 iyi iletir.Is\u0131l iletkenli\u011fi d\u00fc\u015f\u00fck olanlar ise iyi birer yal\u0131tkand\u0131r. A\u015fa\u011f\u0131daki tabloda b\u00e2z\u0131 cisimlerin \u0131s\u0131l iletkenlik katsay\u0131lar\u0131 verilmi\u015ftir. <\/p>\n
Madde S\u0131cakl\u0131k (\u00b0C) Is\u0131l \u0130letkenlik <\/p>\n
Katsay\u0131s\u0131 (Watt\/cm\u00b0C) <\/p>\n
Hava00,00023 <\/p>\n
Al\u00fcminyum302,08 <\/p>\n
Tu\u011fla200,0017 <\/p>\n
Bak\u0131r183,84 <\/p>\n
Pamuk00,00056 <\/p>\n
Cam200,0072 <\/p>\n
Cam y\u00fcn\u00fc300,00042 <\/p>\n
Kur\u015fun180,35 <\/p>\n
Deri (giyecek)300,0016 <\/p>\n
Kau\u00e7uk203,54 <\/p>\n
G\u00fcm\u00fc\u015f184,21 <\/p>\n
\u00c7elik180,46 <\/p>\n
Y\u00fcn300,00036 <\/p>\n
Konveksiyonla transfer: Is\u0131n\u0131n, hareket halindeki s\u0131v\u0131larda veya gazlarda ta\u015f\u0131n\u0131m yoluyla aktar\u0131lmas\u0131d\u0131r. Mesel\u00e2 bir otomobil motorunun radyat\u00f6rle so\u011futulmas\u0131 bu t\u00fcr bir \u0131s\u0131 aktar\u0131m\u0131 ile olur.Konveksiyonla \u0131s\u0131 transferi kond\u00fcksiyonla olan\u0131ndan daha kompleks bir bi\u00e7imde ger\u00e7ekle\u015fir. <\/p>\n
S\u0131cak bir cisim bir s\u0131v\u0131ya dald\u0131r\u0131ld\u0131\u011f\u0131 zaman cismin yak\u0131n\u0131nda bulunan s\u0131v\u0131 k\u0131sm\u0131 \u0131s\u0131n\u0131r ve yukar\u0131 do\u011fru y\u00fckselir; bu arada yerini a\u015fa\u011f\u0131daki so\u011fuk s\u0131v\u0131 k\u0131sm\u0131na terk eder. B\u00f6yle bir i\u015flem ak\u0131\u015fkan\u0131n s\u0131v\u0131 veya gaz olmas\u0131na, ak\u0131\u015fkan\u0131n vizkoz olup olmamas\u0131na g\u00f6re farkl\u0131 bir h\u0131zda tez\u00e2h\u00fcr eder.Is\u0131nan s\u0131v\u0131n\u0131n yerini de\u011fi\u015ftirmek suretiyle so\u011fuk ortama \u0131s\u0131n\u0131n nakledilmesi so\u011fuk ile s\u0131cak cisimler a ras\u0131ndaki s\u0131cakl\u0131k fark\u0131 s\u0131f\u0131ra ininceye kadar dev\u00e2m eder.S\u0131cak cisimden \u0131s\u0131n\u0131n ak\u0131\u015fkana transferi cismin temasta bulundu\u011fu bir film tabakas\u0131ndan olur.Hesaplamalarda kullan\u0131lan konveksiyon katsay\u0131s\u0131, olduk\u00e7a kompleks hesaplamalarla bulunur. <\/p>\n
Radyasyon yolu ile transfer: Is\u0131 enerjisi s\u0131cak ortamdan so\u011fuk ortama herhangi bir maddesel ortam olmaks\u0131z\u0131n aktar\u0131l\u0131yorsa buna radyasyonla transfer denir.Mesel\u00e2 g\u00fcne\u015fin d\u00fcnyay\u0131 \u0131s\u0131tmas\u0131 enerjinin radyasyonla transferi net\u00eecesinde ger\u00e7ekle\u015fir. <\/p>\n
Bir cismin radyasyonla yayd\u0131\u011f\u0131 enerji, cismin mutlak s\u0131cakl\u0131\u011f\u0131n\u0131n 4. kuvvetiyle do\u011fru orant\u0131l\u0131d\u0131r. Bir cismin yayd\u0131\u011f\u0131 veya so\u011furdu\u011fu radyasyon, cismin y\u00fczey yap\u0131s\u0131na da ba\u011fl\u0131d\u0131r.Siyah cisimlerin \u0131\u015f\u0131n yayma veya so\u011furma k\u00e2biliyeti y\u00fcksektir.<\/p>\n","protected":false},"excerpt":{"rendered":"
Is\u0131 Aktar\u0131m\u0131, Alm.V\u00e4rmeleitung (f), Fr. transformation de chaleur, \u0130ng. Heat transfer.Is\u0131 enerjisinin bir yerden ba\u015fka bir yere aktar\u0131ld\u0131\u011f\u0131 \u00e7e\u015fitli projelerin (s\u00fcre\u00e7lerin veya ameliyelerin) ortak ad\u0131. Farkl\u0131 s\u0131cakl\u0131klardaki iki cisim yanyana geldi\u011fi zaman y\u00fcksek s\u0131cakl\u0131ktaki cisimlerden d\u00fc\u015f\u00fck s\u0131cakl\u0131ktaki cisme enerji ak\u0131\u015f\u0131 olur.Cisimler termal dengeye ula\u015f\u0131ncaya (ayn\u0131 s\u0131cakl\u0131\u011fa gelinceye) kadar \u0131s\u0131 ak\u0131\u015f\u0131 dev\u00e2m eder. Bu olay \u0131s\u0131n\u0131n …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1407,1403],"tags":[2258,2256,7059,2778,7058],"class_list":["post-2926","post","type-post","status-publish","format-standard","hentry","category-fen-ve-teknoloji-odevleri","category-odevler","tag-aluminyum","tag-bakir","tag-konveksiyonla-transfer","tag-radyasyon","tag-soguk-cisim-ve-sicak-cisim-arasinda-isi-aktarimi"],"_links":{"self":[{"href":"https:\/\/www.islamidavet.com\/kutuphane\/wp-json\/wp\/v2\/posts\/2926","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.islamidavet.com\/kutuphane\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.islamidavet.com\/kutuphane\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.islamidavet.com\/kutuphane\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.islamidavet.com\/kutuphane\/wp-json\/wp\/v2\/comments?post=2926"}],"version-history":[{"count":0,"href":"https:\/\/www.islamidavet.com\/kutuphane\/wp-json\/wp\/v2\/posts\/2926\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.islamidavet.com\/kutuphane\/wp-json\/wp\/v2\/media?parent=2926"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.islamidavet.com\/kutuphane\/wp-json\/wp\/v2\/categories?post=2926"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.islamidavet.com\/kutuphane\/wp-json\/wp\/v2\/tags?post=2926"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}