1.0CHARRON Yveshttps://yvcharron.comadmin7014https://yvcharron.com/index.php/author/admin7014/rich600338<blockquote class="wp-embedded-content" data-secret="XbEIETslVn"><a href="https://yvcharron.com/index.php/flow-friction/">Flow Friction – Coatings; Flow drag reduction techniques and friction factor measurement</a></blockquote><iframe sandbox="allow-scripts" security="restricted" src="https://yvcharron.com/index.php/flow-friction/embed/#?secret=XbEIETslVn" width="600" height="338" title="“Flow Friction – Coatings; Flow drag reduction techniques and friction factor measurement” — CHARRON Yves" data-secret="XbEIETslVn" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" class="wp-embedded-content"></iframe><script> /*! This file is auto-generated */ !function(d,l){"use strict";l.querySelector&&d.addEventListener&&"undefined"!=typeof URL&&(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&&!/[^a-zA-Z0-9]/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret="'+t.secret+'"]'),o=l.querySelectorAll('blockquote[data-secret="'+t.secret+'"]'),c=new RegExp("^https?:$","i"),i=0;i<o.length;i++)o[i].style.display="none";for(i=0;i<a.length;i++)s=a[i],e.source===s.contentWindow&&(s.removeAttribute("style"),"height"===t.message?(1e3<(r=parseInt(t.value,10))?r=1e3:~~r<200&&(r=200),s.height=r):"link"===t.message&&(r=new URL(s.getAttribute("src")),n=new URL(t.value),c.test(n.protocol))&&n.host===r.host&&l.activeElement===s&&(d.top.location.href=t.value))}},d.addEventListener("message",d.wp.receiveEmbedMessage,!1),l.addEventListener("DOMContentLoaded",function(){for(var e,t,s=l.querySelectorAll("iframe.wp-embedded-content"),r=0;r<s.length;r++)(t=(e=s[r]).getAttribute("data-secret"))||(t=Math.random().toString(36).substring(2,12),e.src+="#?secret="+t,e.setAttribute("data-secret",t)),e.contentWindow.postMessage({message:"ready",secret:t},"*")},!1)))}(window,document); //# sourceURL=https://yvcharron.com/wp-includes/js/wp-embed.min.js </script> To evaluate flow drag, it is required to consider surface topology (steel, coating) and to measure it with lab apparatus for any boundary layer. To reduce flow drag, special surfaces (controlling vortices) and specific materials (parietal sliding, compliant or porous coatings) may be used.