{"id":43106,"date":"2019-10-08T04:08:59","date_gmt":"2019-10-08T03:08:59","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/quest-ce-que-le-mode-de-condensation-types-de-condensation-definition\/"},"modified":"2020-02-06T08:43:40","modified_gmt":"2020-02-06T07:43:40","slug":"quest-ce-que-le-mode-de-condensation-types-de-condensation-definition","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-que-le-mode-de-condensation-types-de-condensation-definition\/","title":{"rendered":"Qu&#8217;est-ce que le mode de condensation &#8211; Types de condensation &#8211; D\u00e9finition"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\">Modes de condensation &#8211; Types de condensation.\u00a0D&#8217;un point de vue technique pratique, la condensation peut \u00eatre class\u00e9e selon plusieurs crit\u00e8res.\u00a0G\u00e9nie thermique<\/div>\n<\/div>\n<div class=\"su-divider su-divider-style-dotted\"><\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-60 lgc-tablet-grid-60 lgc-mobile-grid-100 lgc-equal-heights lgc-first\">\n<div class=\"inside-grid-column\">\n<div class=\"su-spacer\"><\/div>\n<h2>Modes de condensation &#8211; Types de condensation<\/h2>\n<p>D&#8217;un point de vue technique pratique, la\u00a0<strong>condensation<\/strong>\u00a0peut \u00eatre class\u00e9e selon\u00a0<strong>plusieurs crit\u00e8res<\/strong>\u00a0.<\/p>\n<p>En g\u00e9n\u00e9ral, trois formes de condensation distinctes sont observ\u00e9es:<\/p>\n<ul>\n<li><strong>Film de condensation<\/strong>\u00a0.\u00a0Lors de la\u00a0<strong>condensation en film<\/strong>\u00a0, le condensat mouille la surface et forme un film liquide qui glisse vers le bas sous l\u2019effet de la gravit\u00e9.\u00a0La condensation du film entra\u00eene de faibles taux de transfert de chaleur car le film de condensat emp\u00eache le transfert de chaleur.\u00a0L&#8217;\u00e9paisseur du film form\u00e9 d\u00e9pend de nombreux param\u00e8tres, notamment l&#8217;orientation de la surface, la viscosit\u00e9, le taux de condensation, etc. Le film augmente\u00a0<a title=\"R\u00e9sistance thermique - Analogie \u00e0 la r\u00e9sistance \u00e9lectrique\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/heat-transfer\/thermal-conduction\/thermal-resistance-thermal-resistivity\/thermal-resistance-analogy-to-electric-resistance\/\">la r\u00e9sistance thermique<\/a>\u00a0au flux thermique entre la surface et la vapeur.\u00a0Le taux de transfert de chaleur est r\u00e9duit \u00e0 cause de cette r\u00e9sistance.<\/li>\n<li><strong>Condensation goutte \u00e0 goutte<\/strong>\u00a0.\u00a0En condensation goutte \u00e0 goutte, la vapeur condens\u00e9e forme des gouttelettes \u00e0 la surface au lieu d&#8217;un film continu.\u00a0Une condensation goutte \u00e0 goutte peut se produire lorsque la surface n&#8217;est pas\u00a0<strong>mouill\u00e9e<\/strong>\u00a0ou\u00a0<strong>lorsque<\/strong>\u00a0ces gouttelettes sont retir\u00e9es de la surface par un \u00e9coulement externe ou par gravit\u00e9.\u00a0La vapeur est en contact direct avec la surface sur la plus grande partie de la surface et les taux de transfert de chaleur sont beaucoup plus \u00e9lev\u00e9s (plus de 3 \u00e0 10 fois plus \u00e9lev\u00e9s) car la r\u00e9sistance au flux de chaleur entre la vapeur et la surface est tr\u00e8s faible.\u00a0Les gouttelettes se d\u00e9veloppent au niveau des sites de nucl\u00e9ation (points d&#8217;imperfections de surface telles que la fosse, les rayures et les cavit\u00e9s) et grossissent \u00e0 mesure que davantage de vapeur se condense \u00e0 la surface expos\u00e9e.\u00a0Pour\u00a0<a title=\"Condenseur principal - Condenseur de vapeur\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power-plant\/turbine-generator-power-conversion-system\/main-condenser-steam-condenser\/\"><strong>les condenseurs de vapeur<\/strong><\/a>, il est courant d\u2019utiliser des rev\u00eatements de surface (silicons, t\u00e9flons ou cires) qui inhibent le mouillage et stimulent ainsi la condensation goutte \u00e0 goutte.\u00a0Mais les rev\u00eatements perdent progressivement leur efficacit\u00e9 en raison de l&#8217;enl\u00e8vement, de l&#8217;oxydation, etc. En pratique, aucune surface n&#8217;est jug\u00e9e non mouillante pendant une p\u00e9riode prolong\u00e9e.\u00a0\u00c9tant donn\u00e9 que dans la plupart des applications techniques, il est souvent difficile de maintenir cette condition, il est d\u00e9conseill\u00e9 d&#8217;utiliser la valeur des coefficients de transfert de chaleur en supposant une condensation goutte \u00e0 goutte aux fins de conception.<\/li>\n<li><strong>Condensation par contact direct.\u00a0<\/strong>La condensation par contact direct, DCC, se produit lorsque la vapeur est mise en contact avec un liquide froid.\u00a0Comme dans les condenseurs \u00e0 jet, l\u2019eau de refroidissement est pulv\u00e9ris\u00e9e sur la vapeur d\u2019\u00e9chappement et il existe\u00a0<strong>un contact direct<\/strong>\u00a0entre la vapeur d\u2019\u00e9chappement et l\u2019eau de refroidissement.\u00a0Le processus de condensation est\u00a0<strong>tr\u00e8s rapide<\/strong>\u00a0et efficace, mais ici l\u2019eau de refroidissement et la vapeur condens\u00e9e sont\u00a0<strong>m\u00e9lang\u00e9es<\/strong>.\u00a0Les avantages de la condensation par contact direct par rapport aux proc\u00e9d\u00e9s classiques utilisant des surfaces de transfert m\u00e9talliques sont dus \u00e0 la simplicit\u00e9 de conception, \u00e0 la r\u00e9duction des probl\u00e8mes de corrosion et de calaminage, \u00e0 la r\u00e9duction des co\u00fbts de maintenance, \u00e0 des zones de transfert sp\u00e9cifiques plus \u00e9lev\u00e9es et \u00e0 des taux de transfert plus \u00e9lev\u00e9s.\u00a0Malgr\u00e9 ces avantages, les condenseurs \u00e0 jet ne sont pas habituels dans les centrales thermiques, en particulier en raison de la\u00a0<strong>perte de condensat<\/strong>\u00a0.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-40 lgc-tablet-grid-40 lgc-mobile-grid-100 lgc-equal-heights lgc-last\">\n<div class=\"inside-grid-column\">\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/film-condensation-condensation-min.png\"><img loading=\"lazy\" class=\"aligncenter size-medium wp-image-20933 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/film-condensation-condensation-min-185x300.png\" alt=\"condensation de film\" width=\"185\" height=\"300\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/film-condensation-condensation-min-185x300.png\" \/><\/a>___________<\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/dropwise-condensation-condensation-min.png\"><img loading=\"lazy\" class=\"aligncenter size-medium wp-image-20932 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/dropwise-condensation-condensation-min-162x300.png\" alt=\"condensation goutte \u00e0 goutte\" width=\"162\" height=\"300\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/dropwise-condensation-condensation-min-162x300.png\" \/><\/a><\/p>\n<p>___________<\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/direct-contact-condensation-condensation-min.png\"><img loading=\"lazy\" class=\"aligncenter size-medium wp-image-20934\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/direct-contact-condensation-condensation-min-150x300.png\" alt=\"condensation par contact direct\" width=\"150\" height=\"300\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/direct-contact-condensation-condensation-min-150x300.png\" \/><\/a><\/p>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<div class=\"su-divider su-divider-style-dotted\"><\/div>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<div class=\"su-accordion\">\n<div class=\"su-spoiler su-spoiler-style-default su-spoiler-icon-arrow\" data-anchor=\"References\">\n<div class=\"su-spoiler-title\" tabindex=\"0\" role=\"button\"><\/div>\n<\/div>\n<\/div>\n<div tabindex=\"0\" role=\"button\">\n<p>&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;.<\/p>\n<p>Cet article est bas\u00e9 sur la traduction automatique de l&#8217;article original en anglais. Pour plus d&#8217;informations, voir l&#8217;article en anglais. Pouvez vous nous aider Si vous souhaitez corriger la traduction, envoyez-la \u00e0 l&#8217;adresse: translations@nuclear-power.com ou remplissez le formulaire de traduction en ligne. Nous appr\u00e9cions votre aide, nous mettrons \u00e0 jour la traduction le plus rapidement possible. Merci<\/p>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Modes de condensation &#8211; Types de condensation.\u00a0D&#8217;un point de vue technique pratique, la condensation peut \u00eatre class\u00e9e selon plusieurs crit\u00e8res.\u00a0G\u00e9nie thermique Modes de condensation &#8211; Types de condensation D&#8217;un point de vue technique pratique, la\u00a0condensation\u00a0peut \u00eatre class\u00e9e selon\u00a0plusieurs crit\u00e8res\u00a0. En g\u00e9n\u00e9ral, trois formes de condensation distinctes sont observ\u00e9es: Film de condensation\u00a0.\u00a0Lors de la\u00a0condensation en film\u00a0, &#8230; <a title=\"Qu&#8217;est-ce que le mode de condensation &#8211; Types de condensation &#8211; D\u00e9finition\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-que-le-mode-de-condensation-types-de-condensation-definition\/\" aria-label=\"En savoir plus sur Qu&#8217;est-ce que le mode de condensation &#8211; Types de condensation &#8211; D\u00e9finition\">Lire la suite<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[8],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v15.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Qu&#039;est-ce que le mode de condensation - Types de condensation - D\u00e9finition<\/title>\n<meta name=\"description\" content=\"Modes de condensation - Types de condensation. 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