{"id":46246,"date":"2019-10-21T19:09:47","date_gmt":"2019-10-21T18:09:47","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/quelle-est-la-propriete-de-leau-supercritique-definition\/"},"modified":"2020-03-01T08:40:52","modified_gmt":"2020-03-01T07:40:52","slug":"quelle-est-la-propriete-de-leau-supercritique-definition","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/fr\/quelle-est-la-propriete-de-leau-supercritique-definition\/","title":{"rendered":"Quelle est la propri\u00e9t\u00e9 de l&#8217;eau supercritique &#8211; D\u00e9finition"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\">Propri\u00e9t\u00e9s de l&#8217;eau supercritique.\u00a0\u00c0 des pressions sup\u00e9rieures \u00e0 la pression critique, les propri\u00e9t\u00e9s de l&#8217;eau dans le r\u00e9acteur changent progressivement et en continu.\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-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-spacer\"><\/div>\n<h2>Propri\u00e9t\u00e9s de l&#8217;eau supercritique<\/h2>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Supercritical-water-properties-density-enthalpy.png\"><img loading=\"lazy\" class=\"alignright size-medium wp-image-16212 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Supercritical-water-properties-density-enthalpy-273x300.png\" alt=\"Propri\u00e9t\u00e9s de l'eau supercritique\" width=\"273\" height=\"300\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Supercritical-water-properties-density-enthalpy-273x300.png\" \/><\/a>Un\u00a0<a title=\"Fluide supercritique - Eau supercritique\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/materials-nuclear-engineering\/properties-steam-what-is-steam\/supercritical-fluid-supercritical-water\/\"><strong>fluide supercritique<\/strong><\/a>\u00a0est un fluide\u00a0<strong>soumis<\/strong>\u00a0\u00e0 des\u00a0<strong>pressions sup\u00e9rieures<\/strong>\u00a0\u00e0 ses\u00a0<a title=\"Point critique de l'eau\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/materials-nuclear-engineering\/properties-of-water\/critical-point-of-water\/\"><strong>valeurs critiques<\/strong><\/a>\u00a0thermodynamiques\u00a0.\u00a0Aux pressions critiques et supercritiques, un fluide est consid\u00e9r\u00e9 comme une substance monophas\u00e9e malgr\u00e9 le fait que toutes les propri\u00e9t\u00e9s thermophysiques subissent des changements importants dans les\u00a0<strong>r\u00e9gions<\/strong>\u00a0critiques et\u00a0<strong>pseudocritiques<\/strong>\u00a0.<\/p>\n<p>\u00c0 des pressions sup\u00e9rieures \u00e0 la pression critique, les propri\u00e9t\u00e9s de l&#8217;eau dans le r\u00e9acteur changent\u00a0<strong>progressivement<\/strong>\u00a0et de\u00a0<strong>fa\u00e7on continue,<\/strong>\u00a0passant de celles associ\u00e9es \u00e0 un\u00a0<strong>liquide<\/strong>\u00a0(haute densit\u00e9, faible compressibilit\u00e9) \u00e0 celles d&#8217;un\u00a0<strong>gaz<\/strong>\u00a0(faible densit\u00e9, grande compressibilit\u00e9)\u00a0<strong>sans changement de phase<\/strong>\u00a0.\u00a0Il n&#8217;y a pas de changement dans la phase de l&#8217;eau dans le noyau.\u00a0Par ailleurs, les propri\u00e9t\u00e9s physiques telles que la densit\u00e9, la chaleur sp\u00e9cifique, l&#8217;enthalpie sp\u00e9cifique subissent des modifications importantes, en particulier dans la plage de temp\u00e9rature de la\u00a0<strong>r\u00e9gion pseudocritique<\/strong>\u00a0(pour 25 MPa, entre 372 \u00b0 C et 392 \u00b0 C).\u00a0Par exemple, dans un\u00a0<a title=\"R\u00e9acteur \u00e0 eau supercritique - SCWR\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power-plant\/reactor-types\/supercritical-water-reactor-scwr\/\">r\u00e9acteur \u00e0 eau supercritique<\/a>\u00a0typique\u00a0:<\/p>\n<ul>\n<li>la\u00a0<strong>densit\u00e9<\/strong>\u00a0d&#8217;eau supercritique \u00e0 l&#8217;entr\u00e9e et \u00e0 la sortie est d&#8217;environ\u00a0<strong>777 kg \/ m\u00a0<\/strong><sup><strong>3<\/strong><\/sup>\u00a0(pour 25 MPa et 280 \u00b0 C) et de\u00a0<strong>90 kg \/ m\u00a0<sup>3<\/sup><\/strong>\u00a0(pour 25 MPa et 500 \u00b0 C),<\/li>\n<li>l&#8217;\u00a0<strong>enthalpie sp\u00e9cifique<\/strong>\u00a0de l&#8217;eau supercritique \u00e0 l&#8217;entr\u00e9e et \u00e0 la sortie est d&#8217;environ\u00a0<strong>1230 kJ \/ kg<\/strong>\u00a0(pour 25 MPa et 280 \u00b0 C) et de\u00a0<strong>3165 kJ \/ kg<\/strong>\u00a0(pour 25 MPa et 500 \u00b0 C)<\/li>\n<\/ul>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Supercritical-fluid-specific-heat-conductivity.png\"><img loading=\"lazy\" class=\"alignright size-medium wp-image-16211 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Supercritical-fluid-specific-heat-conductivity-182x300.png\" alt=\"conductivit\u00e9 thermique sp\u00e9cifique \u00e0 un fluide supercritique\" width=\"182\" height=\"300\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Supercritical-fluid-specific-heat-conductivity-182x300.png\" \/><\/a>Les figures suivantes montrent le comportement des propri\u00e9t\u00e9s thermophysiques de l&#8217;eau \u00e0 proximit\u00e9 des points critiques (22.1MPa) et pseudocritiques (25MPa).\u00a0Pr\u00e8s du point critique, ces changements de propri\u00e9t\u00e9 sont spectaculaires.\u00a0Au voisinage du point pseudo-critique \u00e0 25 MPa, ces changements de propri\u00e9t\u00e9 deviennent moins importants.\u00a0\u00c0 25 MPa, les modifications de propri\u00e9t\u00e9 les plus significatives se produisent \u00e0 \u00b1 25 \u00b0 C autour du point pseudocritique (389,4 \u00b0 C), cette r\u00e9gion est connue sous le nom de r\u00e9gion pseudocritique.\u00a0Pour des raisons de commodit\u00e9, en dessous du point pseudocritique, les propri\u00e9t\u00e9s des fluides sont consid\u00e9r\u00e9es comme pr\u00e9sentant\u00a0<strong>un<\/strong>\u00a0comportement\u00a0<strong>semblable \u00e0<\/strong>\u00a0un\u00a0<strong>liquide<\/strong>\u00a0et au-dessus du point pseudocritique, elles sont consid\u00e9r\u00e9es comme pr\u00e9sentant\u00a0<strong>un<\/strong>\u00a0comportement\u00a0<strong>similaire \u00e0<\/strong>\u00a0un\u00a0<strong>gaz<\/strong> .<\/p>\n<\/div>\n<\/div>\n<p>&nbsp;<\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/supercritical-water-reactor-SCWR-parameters.png\"><img loading=\"lazy\" class=\"size-full wp-image-16213 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/supercritical-water-reactor-SCWR-parameters.png\" alt=\"Caract\u00e9ristiques des SCWR\" width=\"879\" height=\"868\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/supercritical-water-reactor-SCWR-parameters.png\" \/><\/a><span>Propri\u00e9t\u00e9s typiques du liquide de refroidissement dans SCWR.<\/span><\/p>\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-plus su-spoiler-closed\">\n<div class=\"su-spoiler-content su-clearfix\"><\/div>\n<\/div>\n<\/div>\n<div>\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>Propri\u00e9t\u00e9s de l&#8217;eau supercritique.\u00a0\u00c0 des pressions sup\u00e9rieures \u00e0 la pression critique, les propri\u00e9t\u00e9s de l&#8217;eau dans le r\u00e9acteur changent progressivement et en continu.\u00a0G\u00e9nie thermique Propri\u00e9t\u00e9s de l&#8217;eau supercritique Un\u00a0fluide supercritique\u00a0est un fluide\u00a0soumis\u00a0\u00e0 des\u00a0pressions sup\u00e9rieures\u00a0\u00e0 ses\u00a0valeurs critiques\u00a0thermodynamiques\u00a0.\u00a0Aux pressions critiques et supercritiques, un fluide est consid\u00e9r\u00e9 comme une substance monophas\u00e9e malgr\u00e9 le fait que toutes les propri\u00e9t\u00e9s &#8230; <a title=\"Quelle est la propri\u00e9t\u00e9 de l&#8217;eau supercritique &#8211; D\u00e9finition\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/fr\/quelle-est-la-propriete-de-leau-supercritique-definition\/\" aria-label=\"En savoir plus sur Quelle est la propri\u00e9t\u00e9 de l&#8217;eau supercritique &#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>Quelle est la propri\u00e9t\u00e9 de l&#039;eau supercritique - D\u00e9finition<\/title>\n<meta name=\"description\" content=\"Propri\u00e9t\u00e9s de l&#039;eau supercritique. \u00c0 des pressions sup\u00e9rieures \u00e0 la pression critique, les propri\u00e9t\u00e9s de l&#039;eau dans le r\u00e9acteur changent progressivement et en continu. 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