{"id":61179,"date":"2023-11-30T11:49:42","date_gmt":"2023-11-30T09:49:42","guid":{"rendered":"https:\/\/www.iemn.fr\/articles-temporaires-anglais\/les_va_et_vient_d_un_mur_liquide-2.html"},"modified":"2023-12-08T11:55:42","modified_gmt":"2023-12-08T09:55:42","slug":"the-to-and-fro-of-a-liquid-wall","status":"publish","type":"post","link":"https:\/\/www.iemn.fr\/en\/newsletter\/the-to-and-fro-of-a-liquid-wall.html","title":{"rendered":"The to-and-fro of a liquid wall"},"content":{"rendered":"<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-muhi4j-598fbb5dd27765cc26558ff6f99d6ecb\">\n.flex_column.av-muhi4j-598fbb5dd27765cc26558ff6f99d6ecb{\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\n}\n<\/style>\n<div  class='flex_column av-muhi4j-598fbb5dd27765cc26558ff6f99d6ecb av_one_full  avia-builder-el-0  el_before_av_one_half  avia-builder-el-first  first flex_column_div av-zero-column-padding'     ><p><section  class='av_textblock_section av-lpl1s9s6-311e62d6a98c4b5eac505d405a0cc9f0'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><p><a href=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2023\/11\/bandeau_gouttes.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-61006 size-full aligncenter\" src=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2023\/11\/bandeau_gouttes.jpg\" alt=\"\" width=\"1000\" height=\"153\" srcset=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2023\/11\/bandeau_gouttes.jpg 1000w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2023\/11\/bandeau_gouttes-300x46.jpg 300w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2023\/11\/bandeau_gouttes-768x118.jpg 768w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2023\/11\/bandeau_gouttes-18x3.jpg 18w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2023\/11\/bandeau_gouttes-705x108.jpg 705w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/a><\/p>\n<\/div><\/section><br \/>\n<section  class='av_textblock_section av-lpl0gj01-2ac17c2640130b7ad678045394e8770f'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><h1 style=\"font-weight: 400; text-align: center;\"><strong><span style=\"color: #185078;\">The to-and-fro of a liquid wall<\/span><\/strong><\/h1>\n<\/div><\/section><br \/>\n<section  class='av_textblock_section av-lpl0kxdi-a411ac227792ea754e572cfbe2eff59c'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><blockquote>\n<p style=\"font-weight: 400;\"><strong><span style=\"color: #185078;\">The impact of a vertical jet of water on a horizontal surface is something we experience as soon as we turn on the kitchen tap. At the bottom of the sink, we can observe a more or less circular liquid wall separating two distinct zones: a thin inner zone and a thicker outer zone. This liquid wall, known as the circular hydraulic jump, has intrigued people since Leonardo da Vinci, and remains a subject of current interest and study. In a recent article, we highlighted a new aspect of this constriction: under certain conditions, it can start to oscillate spontaneously, opening and closing periodically, while the jet is stationary.<\/span><\/strong><\/p>\n<\/blockquote>\n<\/div><\/section><\/p><\/div>\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-12q1mv7-e6450b551f2fbe5e5c4a61b06eab65de\">\n.flex_column.av-12q1mv7-e6450b551f2fbe5e5c4a61b06eab65de{\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\n}\n<\/style>\n<div  class='flex_column av-12q1mv7-e6450b551f2fbe5e5c4a61b06eab65de av_one_half  avia-builder-el-4  el_after_av_one_full  el_before_av_one_half  first flex_column_div av-zero-column-padding  column-top-margin'     ><section  class='av_textblock_section av-lpl0kxdi-a411ac227792ea754e572cfbe2eff59c'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><p style=\"font-weight: 400;\"><a href=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2023\/11\/visuel_alexis.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft wp-image-60996\" src=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2023\/11\/visuel_alexis-297x300.jpg\" alt=\"\" width=\"297\" height=\"300\" srcset=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2023\/11\/visuel_alexis-297x300.jpg 297w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2023\/11\/visuel_alexis-80x80.jpg 80w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2023\/11\/visuel_alexis-12x12.jpg 12w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2023\/11\/visuel_alexis-36x36.jpg 36w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2023\/11\/visuel_alexis.jpg 600w\" sizes=\"auto, (max-width: 297px) 100vw, 297px\" \/><\/a><\/p>\n<p>For centuries, \u00ab\u00a0natura non facit saltus\u00a0\u00bb (nature doesn&rsquo;t make jumps) has been a guiding principle in philosophy and physics. We know today that this principle is not always valid, but it&rsquo;s always interesting to observe and understand cases where it doesn&rsquo;t apply. In particular, we don&rsquo;t expect fluids to be systems where we find discontinuous jumps, but in reality we find among free-surface flows magnificent phenomena that seemingly violate the natural principle of continuity.<\/p>\n<p>Hydraulic jumps are an edifying example of this, which is why so much work has been devoted to understanding them over the centuries. Despite these efforts, there is still no simple, consensual model that can fully describe hydraulic jumping. However, all theories and experiments to date agree that the circular jump is a stationary object.<\/p>\n<\/div><\/section><\/div><\/p>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-ksd1b7-01ec4316af7e7f187e9d2d299d5a7c65\">\n.flex_column.av-ksd1b7-01ec4316af7e7f187e9d2d299d5a7c65{\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\n}\n<\/style>\n<div  class='flex_column av-ksd1b7-01ec4316af7e7f187e9d2d299d5a7c65 av_one_half  avia-builder-el-6  el_after_av_one_half  el_before_av_textblock  flex_column_div av-zero-column-padding  column-top-margin'     ><section  class='av_textblock_section av-lpl0kxdi-a411ac227792ea754e572cfbe2eff59c'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><p style=\"font-weight: 400;\"><strong><span style=\"color: #185078;\">We have recently shown that this is not always the case. Indeed, if a sub-millimetre jet of water is allowed to impact the center of a Plexiglas disc, spontaneous oscillations of the jump can be observed.<\/span><\/strong><\/p>\n<p style=\"font-weight: 400;\">This dynamic can be explained by the emission of gravity waves by the jump, which reflect off the edge of the disc, forming a \u00ab\u00a0resonance cavity\u00a0\u00bb (in the same way that sound resonates in the body of a guitar). The resonance cavity selects a frequency for these gravity waves, which, due to variations in height, will periodically close and open the jump. This coupling can even be used to synchronize distant springs that oscillate in phase opposition if they are placed where variations in water height are greatest.<\/p>\n<p><strong><span style=\"color: #185078;\">This new phenomenon opens up new perspectives for the transient study of jet impact and its interaction with gravity waves, but also, by analogy, to other fields ranging from acoustic shock waves (wall of sound) to astrophysics, where it is used as an analogue for white holes.<\/span><\/strong><\/p>\n<p><strong><span style=\"color: #185078;\">However, our research is not just fundamental: jet impact also plays a fundamental role in surface cooling and cleaning processes. Oscillations of the jet are likely to modify the thermal and mechanical transfers involved, and thus have a real impact on the efficiency of these processes.<\/span><\/strong><\/p>\n<hr \/>\n<h6 style=\"text-align: center;\">Contact:<\/h6>\n<p style=\"text-align: center;\"><div  class='avia-button-wrap av-rpqvoq-40f9ce4aabbd2e58c15d373bb2e02ba6-wrap avia-button-center  avia-builder-el-8  avia-builder-el-no-sibling'><a href='mailto:Alexis.duchesne@univ-lille.fr'  class='avia-button av-rpqvoq-40f9ce4aabbd2e58c15d373bb2e02ba6 av-link-btn avia-icon_select-yes-left-icon avia-size-small avia-position-center avia-color-silver'   aria-label=\"Alexis.duchesne@univ-lille.fr\"><span class='avia_button_icon avia_button_icon_left' aria-hidden='true' data-av_icon='\ue805' data-av_iconfont='entypo-fontello'><\/span><span class='avia_iconbox_title' >Alexis.duchesne@univ-lille.fr<\/span><\/a><\/div><\/p>\n<\/div><\/section><\/div>\n<section  class='av_textblock_section av-lpl0kxdi-a411ac227792ea754e572cfbe2eff59c'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><hr \/>\n<h6 style=\"text-align: center;\"><strong>\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-wzsvks-b472822e75966bd4c4fb0da6bd3500d5\">\n.av_font_icon.av-wzsvks-b472822e75966bd4c4fb0da6bd3500d5{\ncolor:#7bb0e7;\nborder-color:#7bb0e7;\n}\n.av_font_icon.av-wzsvks-b472822e75966bd4c4fb0da6bd3500d5 .av-icon-char{\nfont-size:25px;\nline-height:25px;\n}\n<\/style>\n<span  class='av_font_icon av-wzsvks-b472822e75966bd4c4fb0da6bd3500d5 avia_animate_when_visible av-icon-style- avia-icon-pos-center avia-icon-animate'><span class='av-icon-char' aria-hidden='true' data-av_icon='\ue826' data-av_iconfont='entypo-fontello' ><\/span><\/span> <\/strong>Full details of the study can be found at: <a href=\"https:\/\/journals.aps.org\/prl\/abstract\/10.1103\/PhysRevLett.131.194001\" target=\"_blank\" rel=\"noopener\">https:\/\/journals.aps.org\/prl\/abstract\/10.1103\/PhysRevLett.131.194001<\/a><\/h6>\n<hr \/>\n<h6 style=\"text-align: center;\">This work was announced in Le Monde<\/h6>\n<h6 style=\"text-align: center;\"><a href=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2023\/11\/le_monde_logo.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-61001\" src=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2023\/11\/le_monde_logo.jpg\" alt=\"\" width=\"100\" height=\"27\" srcset=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2023\/11\/le_monde_logo.jpg 200w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2023\/11\/le_monde_logo-18x5.jpg 18w\" sizes=\"auto, (max-width: 100px) 100vw, 100px\" \/><\/a><\/h6>\n<h6 style=\"font-weight: 400; text-align: center;\"><a href=\"https:\/\/www.lemonde.fr\/sciences\/article\/2023\/11\/29\/physique-quand-l-eau-joue-a-cache-cache_6202968_1650684.html\" target=\"_blank\" rel=\"noopener\">https:\/\/www.lemonde.fr\/sciences\/article\/2023\/11\/29\/physique-quand-l-eau-joue-a-cache-cache_6202968_1650684.html<\/a><\/h6>\n<hr \/>\n<h6 style=\"font-weight: 400; text-align: center;\"><strong><span style=\"color: #800000;\">and in Physics<\/span><\/strong><\/h6>\n<h6 style=\"font-weight: 400; text-align: center;\"><a href=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2023\/11\/physics_logo.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-61000\" src=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2023\/11\/physics_logo.jpg\" alt=\"\" width=\"90\" height=\"41\" srcset=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2023\/11\/physics_logo.jpg 128w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2023\/11\/physics_logo-18x8.jpg 18w\" sizes=\"auto, (max-width: 90px) 100vw, 90px\" \/><\/a><\/h6>\n<h6 style=\"font-weight: 400; text-align: center;\"><a href=\"https:\/\/physics.aps.org\/articles\/v16\/s151\" target=\"_blank\" rel=\"noopener\">https:\/\/physics.aps.org\/articles\/v16\/s151<\/a><\/h6>\n<h6 style=\"font-weight: 400; text-align: center;\"><\/h6>\n<\/div><\/section>","protected":false},"excerpt":{"rendered":"","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[297],"tags":[],"class_list":["post-61179","post","type-post","status-publish","format-standard","hentry","category-newsletter"],"_links":{"self":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts\/61179","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/comments?post=61179"}],"version-history":[{"count":0,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts\/61179\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/media?parent=61179"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/categories?post=61179"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/tags?post=61179"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}