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Les caract\u00e9ristiques thermophysiques des substances sont \u00e0 la base des calculs et des mod\u00e8les. Elles sont absolument indispensables \u00e0 la d\u00e9termination de donn\u00e9es significatives encore plus pouss\u00e9es en mati\u00e8re de s\u00e9curit\u00e9, comme par exemple pour l\u2019\u00e9valuation d\u2019une g\u00e9n\u00e9ration de chaleur ou d\u2019une quantit\u00e9 de chaleur sp\u00e9cifique par le biais des temp\u00e9ratures mesur\u00e9es. Une technique utilis\u00e9e pour la d\u00e9termination de certaines de ces donn\u00e9es thermophysiques est la m\u00e9thode de la source plane transitoire<\/em> (disque chaud) conform\u00e9ment \u00e0 la norme ISO 22007-2.<\/p>\n A l\u2019aide d\u2019une telle mesure Hot Disk, il est possible, \u00e0 partir d\u2019une s\u00e9rie de mesures, de d\u00e9terminer la conductivit\u00e9 thermique \u03bb<\/em>, la diffusivit\u00e9 thermique a<\/em> ainsi que la capacit\u00e9 calorifique sp\u00e9cifique par unit\u00e9 de volume s<\/em>. La capacit\u00e9 calorifique sp\u00e9cifique par unit\u00e9 de volume est convertie en capacit\u00e9 calorifique sp\u00e9cifique cp<\/sub><\/em> \u00e0 partir de la densit\u00e9 en vrac pr\u00e9alablement mesur\u00e9e.<\/p>\n Pour effectuer cette mesure, on place la substance \u00e0 tester dans une forme sp\u00e9ciale \u00e0 volume variable et on en quantifie la masse afin de calculer la densit\u00e9 en vrac de l\u2019\u00e9chantillon relativement au volume concern\u00e9. On introduit ensuite la sonde du disque chaud en position horizontale et de mani\u00e8re centr\u00e9e dans l\u2019\u00e9prouvette remplie. La sonde sert d\u2019une part de source de chauffage et d\u2019autre part de capteur de temp\u00e9rature dynamique. A l\u2019aide d\u2019une \u00e9nergie de chauffage \u00e9lectrique d\u00e9termin\u00e9e (mW) et \u00e0 raison d\u2019une dur\u00e9e de mesure pr\u00e9d\u00e9finie (s), on fournit une quantit\u00e9 d\u2019\u00e9nergie d\u00e9finie \u00e0 la sonde plac\u00e9e au milieu de l\u2019\u00e9prouvette, tout en mesurant parall\u00e8lement les variations de temp\u00e9rature de l\u2019\u00e9chantillon \u00e0 tester.<\/p>\n Les donn\u00e9es de mesure ainsi recueillies, telles que la capacit\u00e9 thermique, peuvent \u00eatre par exemple utilis\u00e9es pour l\u2019\u00e9valuation d\u2019une exp\u00e9rience de mesures adiabatiques en panier m\u00e9tallique, ou encore pour l\u2019\u00e9valuation d\u2019une exp\u00e9rience d\u2019accumulation de chaleur et de pression adiabatique. La connaissance de la capacit\u00e9 thermique pr\u00e9cise d\u2019un \u00e9chantillon permet \u00e9galement de d\u00e9terminer des caract\u00e9ristiques de s\u00e9curit\u00e9 encore plus pr\u00e9cises.<\/p>\n Il est possible d\u2019exploiter d\u2019une mani\u00e8re encore plus approfondie la caract\u00e9ristique de la diffusivit\u00e9 thermique a<\/em>, en l\u2019utilisant notamment en association avec certains param\u00e8tres cin\u00e9tiques (principe d\u2018Arrhenius, cin\u00e9tique d\u2019ordre z\u00e9ro) issus d\u2019une exp\u00e9rience d\u2019accumulation de chaleur et de pression adiabatique. Ceci permet de calculer des valeurs pour la SADT ou TDAA (self accelarating decomposition temperature \u2013 ou temp\u00e9rature de d\u00e9composition auto-acc\u00e9l\u00e9r\u00e9e<\/em>) par application du principe de l\u2019explosion thermique selon la th\u00e9orie de Frank Kamenetskii, selon les diff\u00e9rentes tailles de r\u00e9cipients.<\/p>\n [1] \u00a0\u00a0\u00a0\u00a0\u00a0<\/sup>ISO 22007-2 (2015-08-01): Plastics \u2013 Determination of thermal conductivity and thermal diffusivity, Part 2: Transient plane heat source (hot disc) method [\/vc_column_text][vc_row_inner rt_row_style=\u00a0\u00bbglobal-style\u00a0\u00bb rt_bg_custom_alignment=\u00a0\u00bbtop\u00a0\u00bb][vc_column_inner width=\u00a0\u00bb1\/2″ rt_column_shadow=\u00a0\u00bb\u00a0\u00bb rt_bg_image_repeat=\u00a0\u00bbrepeat\u00a0\u00bb rt_bg_size=\u00a0\u00bbauto auto\u00a0\u00bb rt_bg_attachment=\u00a0\u00bbscroll\u00a0\u00bb][vc_btn title=\u00a0\u00bbCaract\u00e9ristiques des substances\u00a0\u00bb style=\u00a0\u00bbclassic\u00a0\u00bb color=\u00a0\u00bbpurple\u00a0\u00bb i_icon_fontawesome=\u00a0\u00bbfas fa-angle-left\u00a0\u00bb add_icon=\u00a0\u00bbtrue\u00a0\u00bb link=\u00a0\u00bburl:%2Ffr%2Fprestations%2Fcaracteristiques-des-substances-relevant-de-la-securite%2F|title:Caract%C3%A9ristiques%20des%20substances\u00a0\u00bb el_class=\u00a0\u00bbbtn–red\u00a0\u00bb][\/vc_column_inner][vc_column_inner width=\u00a0\u00bb1\/2″ rt_column_shadow=\u00a0\u00bb\u00a0\u00bb rt_bg_image_repeat=\u00a0\u00bbrepeat\u00a0\u00bb rt_bg_size=\u00a0\u00bbauto auto\u00a0\u00bb rt_bg_attachment=\u00a0\u00bbscroll\u00a0\u00bb][vc_btn title=\u00a0\u00bbPrestations\u00a0\u00bb style=\u00a0\u00bbclassic\u00a0\u00bb color=\u00a0\u00bbpurple\u00a0\u00bb i_icon_fontawesome=\u00a0\u00bbfas fa-angle-left\u00a0\u00bb add_icon=\u00a0\u00bbtrue\u00a0\u00bb link=\u00a0\u00bburl:%2Ffr%2Fprestations%2F|title:Prestations\u00a0\u00bb el_class=\u00a0\u00bbbtn–red\u00a0\u00bb][\/vc_column_inner][\/vc_row_inner][\/vc_column][\/vc_row]<\/p>\n","protected":false},"excerpt":{"rendered":" [vc_row rt_row_background_width=\u00a0\u00bbfullwidth\u00a0\u00bb rt_row_content_width=\u00a0\u00bbdefault\u00a0\u00bb rt_row_style=\u00a0\u00bbdefault-style\u00a0\u00bb rt_row_borders=\u00a0\u00bb\u00a0\u00bb rt_row_shadows=\u00a0\u00bb\u00a0\u00bb rt_row_paddings=\u00a0\u00bbfalse\u00a0\u00bb rt_bg_effect=\u00a0\u00bbclassic\u00a0\u00bb rt_bg_image_repeat=\u00a0\u00bbrepeat\u00a0\u00bb rt_bg_size=\u00a0\u00bbcover\u00a0\u00bb rt_bg_position=\u00a0\u00bbright top\u00a0\u00bb rt_bg_attachment=\u00a0\u00bbscroll\u00a0\u00bb rt_bg_video_format=\u00a0\u00bbself-hosted\u00a0\u00bb][vc_column width=\u00a0\u00bb1\/3″ rt_column_shadow=\u00a0\u00bb\u00a0\u00bb rt_bg_image_repeat=\u00a0\u00bbrepeat\u00a0\u00bb rt_bg_size=\u00a0\u00bbauto auto\u00a0\u00bb rt_bg_attachment=\u00a0\u00bbscroll\u00a0\u00bb class=\u00a0\u00bbdownload\u00a0\u00bb rt_bg_color=\u00a0\u00bb\u00a0\u00bb rt_bg_overlay_color=\u00a0\u00bb\u00a0\u00bb offset=\u00a0\u00bbvc_hidden-sm vc_hidden-xs\u00a0\u00bb css=\u00a0\u00bb.vc_custom_1532422018913{padding-bottom: 0px !important;}\u00a0\u00bb rt_padding_bottom=\u00a0\u00bb0″][vc_widget_sidebar sidebar_id=\u00a0\u00bbrt-theme-20-common-sidebar\u00a0\u00bb][\/vc_column][vc_column width=\u00a0\u00bb2\/3″ rt_column_shadow=\u00a0\u00bb\u00a0\u00bb rt_bg_image_repeat=\u00a0\u00bbrepeat\u00a0\u00bb rt_bg_size=\u00a0\u00bbauto auto\u00a0\u00bb rt_bg_attachment=\u00a0\u00bbscroll\u00a0\u00bb class=\u00a0\u00bbmaincontent\u00a0\u00bb rt_bg_color=\u00a0\u00bb\u00a0\u00bb rt_bg_overlay_color=\u00a0\u00bb\u00a0\u00bb css=\u00a0\u00bb.vc_custom_1532422014773{padding-bottom: 2em !important;}\u00a0\u00bb][vc_column_text el_class=\u00a0\u00bbredborderleft\u00a0\u00bb] M\u00e9thode disque chaud (hot disk) (d\u00e9termination de la conductivit\u00e9 thermique et de …
\n[2] Kotoyori, Takashi: Diffusion and Heat Transfer in Chemical Kinetics<\/em>. 1st<\/sup>
\nEdition. Elsevier Science, 2005
\n<\/strong>[3] Frank-Kamenetskii, David A. ; Appleton, John P. (Hrsg.): Diffusion and
\nHeat Transfer in Chemical Kinetics<\/em>. 2nd Enlarged and Revised Edition. Plenum Press, 1969<\/strong><\/p>\n
more | mehr<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"parent":9313,"menu_order":10,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-10095","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/consilab.de\/fr\/wp-json\/wp\/v2\/pages\/10095","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/consilab.de\/fr\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/consilab.de\/fr\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/consilab.de\/fr\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/consilab.de\/fr\/wp-json\/wp\/v2\/comments?post=10095"}],"version-history":[{"count":1,"href":"https:\/\/consilab.de\/fr\/wp-json\/wp\/v2\/pages\/10095\/revisions"}],"predecessor-version":[{"id":12093,"href":"https:\/\/consilab.de\/fr\/wp-json\/wp\/v2\/pages\/10095\/revisions\/12093"}],"up":[{"embeddable":true,"href":"https:\/\/consilab.de\/fr\/wp-json\/wp\/v2\/pages\/9313"}],"wp:attachment":[{"href":"https:\/\/consilab.de\/fr\/wp-json\/wp\/v2\/media?parent=10095"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}