{"id":377,"date":"2019-01-22T00:43:14","date_gmt":"2019-01-22T00:43:14","guid":{"rendered":"http:\/\/fenneclabs.net\/?p=377"},"modified":"2019-01-22T07:57:02","modified_gmt":"2019-01-22T07:57:02","slug":"3d-printed-venturi-pump","status":"publish","type":"post","link":"https:\/\/fenneclabs.net\/index.php\/2019\/01\/22\/3d-printed-venturi-pump\/","title":{"rendered":"3D printed Venturi pump"},"content":{"rendered":"<p>If for some reason you need to pump fine dust dust or a fluid (gas or liquid) without it flowing through the pump itself, Venturi is a great way to go. Two good examples are wood or fiberglass dust collection, as sucking these through the pump would result in gunk accumulating inside the diaphragm\/fan and bearings and\u00a0 damage the operation of the pump.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"irc_mi\" src=\"https:\/\/www.wassertec.co.za\/wp-content\/images\/venturis\/venturis-diagram.svg\" alt=\"Image result for venturi\" width=\"1080\" height=\"345\" \/><\/p>\n<p>My motivation in making a Venturi pump originated from a PCB etching station I&#8217;m working on. It is filled a cupric chloride solution and upon heating, some chlorine gas is evaporated. The gas is quite nasty to breath, it is heavier than air and sinks below the window level,\u00a0 therefore does not evacuate without sufficient air flow through the room.<\/p>\n<p>My initial solution was very naive, I was pumping the chlorine gas right through a generic PC blower and it did not last more than several hours of work. The chlorine gas condensed in the motor housing and corroded it to its death.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-380\" src=\"http:\/\/fenneclabs.net\/wordpress\/wp-content\/uploads\/2019\/01\/bad-suction.png\" alt=\"\" width=\"404\" height=\"718\" srcset=\"https:\/\/fenneclabs.net\/wordpress\/wp-content\/uploads\/2019\/01\/bad-suction.png 404w, https:\/\/fenneclabs.net\/wordpress\/wp-content\/uploads\/2019\/01\/bad-suction-169x300.png 169w\" sizes=\"auto, (max-width: 404px) 100vw, 404px\" \/><\/p>\n<p>I then decided to use a Venturi pump to suck the chlorine fumes without them flowing through the blower, and went on by searching models online that design for 3D printing. Unsurprisingly I was unable to find a customizable model in Thingiverse as designers usually upload STLs only, without including the MCAD source files, so I went on and designed a Venturi pump from scratch, using the following concept:<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/i2.wp.com\/makezine.com\/wp-content\/uploads\/2015\/12\/Venturi-diagram07212015-e1451408185522.png?resize=415%2C301&amp;ssl=1\" alt=\"Venturi-diagram07212015\" \/><\/p>\n<p>The main principle here is that by generating air flow through a narrow throat, the fluid accelerates to a higher speed and by conservation of energy the pressure must drop, as seen in the Bernoulli equation:<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/hyperphysics.phy-astr.gsu.edu\/hbase\/imgmec\/bernoul.gif\" \/><\/p>\n<p>By adding an air inlet in the throat, we can tap into the pressure drop and suck air into the main stream (if the air velocity is high enough to drop the pressure\u00a0 in the throat below atmospheric pressure). Turning this idea into a Solidworks model was quite easy:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-large wp-image-381\" src=\"http:\/\/fenneclabs.net\/wordpress\/wp-content\/uploads\/2019\/01\/venturi-1024x474.jpg\" alt=\"\" width=\"525\" height=\"243\" srcset=\"https:\/\/fenneclabs.net\/wordpress\/wp-content\/uploads\/2019\/01\/venturi-1024x474.jpg 1024w, https:\/\/fenneclabs.net\/wordpress\/wp-content\/uploads\/2019\/01\/venturi-300x139.jpg 300w, https:\/\/fenneclabs.net\/wordpress\/wp-content\/uploads\/2019\/01\/venturi-768x356.jpg 768w, https:\/\/fenneclabs.net\/wordpress\/wp-content\/uploads\/2019\/01\/venturi.jpg 1920w\" sizes=\"auto, (max-width: 525px) 100vw, 525px\" \/><\/p>\n<p>Sadly, when I blew air through the device, the suction inlet was actually blowing the air out!\u00a0 I&#8217;ve tried several throat sized and configurations to no avail, they all suffered from the same phenomenon. one possible explanation is that the\u00a0Bernoulli equation does not hold for compressible fluids such as air.<\/p>\n<figure id=\"attachment_382\" aria-describedby=\"caption-attachment-382\" style=\"width: 525px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-382 size-large\" src=\"http:\/\/fenneclabs.net\/wordpress\/wp-content\/uploads\/2019\/01\/IMG_20190122_000334-1024x576.jpg\" alt=\"\" width=\"525\" height=\"295\" srcset=\"https:\/\/fenneclabs.net\/wordpress\/wp-content\/uploads\/2019\/01\/IMG_20190122_000334-1024x576.jpg 1024w, https:\/\/fenneclabs.net\/wordpress\/wp-content\/uploads\/2019\/01\/IMG_20190122_000334-300x169.jpg 300w, https:\/\/fenneclabs.net\/wordpress\/wp-content\/uploads\/2019\/01\/IMG_20190122_000334-768x432.jpg 768w\" sizes=\"auto, (max-width: 525px) 100vw, 525px\" \/><figcaption id=\"caption-attachment-382\" class=\"wp-caption-text\">Failed attempts :'(<\/figcaption><\/figure>\n<p>I was very disappointed and went back to searching online for Venturi designs, and noticed that almost all of the Venturi devices shaped this way are designed for water as the main channel fluid. I also found out that popular design for air powered Venturi pump is the following:<img loading=\"lazy\" decoding=\"async\" class=\"\" style=\"font-size: 1rem;\" title=\"Venturi vacuum pump principle\" src=\"https:\/\/www.coval-inc.com\/image\/venturi-vacuum-pump-principle.jpg\" alt=\"Venturi vacuum pump principle\" width=\"407\" height=\"177\" \/><\/p>\n<p>As I have never studied fluid mechanics, I can only guess why this design works well for airflow, and I think that the air exiting the the nozzle moves forward so fast that it does not curve into the vacuum port, thus not adding to its pressure, and at the same time, it pushes on the fluid in the expansion chamber, and creates a drag force sucking air through the vacuum port.<\/p>\n<p>I then modeled the concept into a 3D model:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-383 size-large\" src=\"http:\/\/fenneclabs.net\/wordpress\/wp-content\/uploads\/2019\/01\/venturi-2-e1548143803515-1024x552.jpg\" alt=\"\" width=\"525\" height=\"283\" srcset=\"https:\/\/fenneclabs.net\/wordpress\/wp-content\/uploads\/2019\/01\/venturi-2-e1548143803515-1024x552.jpg 1024w, https:\/\/fenneclabs.net\/wordpress\/wp-content\/uploads\/2019\/01\/venturi-2-e1548143803515-300x162.jpg 300w, https:\/\/fenneclabs.net\/wordpress\/wp-content\/uploads\/2019\/01\/venturi-2-e1548143803515-768x414.jpg 768w, https:\/\/fenneclabs.net\/wordpress\/wp-content\/uploads\/2019\/01\/venturi-2-e1548143803515.jpg 1646w\" sizes=\"auto, (max-width: 525px) 100vw, 525px\" \/><\/p>\n<p>3D printed it (it&#8217;s not pretty, I own a 3 year old Printrbot, so sew me):<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-384 size-large\" src=\"http:\/\/fenneclabs.net\/wordpress\/wp-content\/uploads\/2019\/01\/IMG_20190122_002538-e1548109760372-1024x531.jpg\" alt=\"\" width=\"525\" height=\"272\" srcset=\"https:\/\/fenneclabs.net\/wordpress\/wp-content\/uploads\/2019\/01\/IMG_20190122_002538-e1548109760372-1024x531.jpg 1024w, https:\/\/fenneclabs.net\/wordpress\/wp-content\/uploads\/2019\/01\/IMG_20190122_002538-e1548109760372-300x156.jpg 300w, https:\/\/fenneclabs.net\/wordpress\/wp-content\/uploads\/2019\/01\/IMG_20190122_002538-e1548109760372-768x399.jpg 768w\" sizes=\"auto, (max-width: 525px) 100vw, 525px\" \/><\/p>\n<p>and&#8230; SUCCESS!!! I was able to lift small pieces of paper with, and that made me unproportionally happy! But then I felt that sharing measurable numbers is a bit more informative than paper lifting, and decided to measure the static vacuum pressure and the unobstructed (no load) flow rate.<\/p>\n<p>First I made a setup to measure the flow rate using a diaphragm pump, a flow meter, and the Venturi pump:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-large wp-image-386\" src=\"http:\/\/fenneclabs.net\/wordpress\/wp-content\/uploads\/2019\/01\/IMG_20190122_003804-1-1024x576.jpg\" alt=\"\" width=\"525\" height=\"295\" srcset=\"https:\/\/fenneclabs.net\/wordpress\/wp-content\/uploads\/2019\/01\/IMG_20190122_003804-1-1024x576.jpg 1024w, https:\/\/fenneclabs.net\/wordpress\/wp-content\/uploads\/2019\/01\/IMG_20190122_003804-1-300x169.jpg 300w, https:\/\/fenneclabs.net\/wordpress\/wp-content\/uploads\/2019\/01\/IMG_20190122_003804-1-768x432.jpg 768w, https:\/\/fenneclabs.net\/wordpress\/wp-content\/uploads\/2019\/01\/IMG_20190122_003804-1.jpg 1280w\" sizes=\"auto, (max-width: 525px) 100vw, 525px\" \/><\/p>\n<p>And measured the flow rate through the vacuum port to be almost 1.5 <em>L\/min<\/em>. I have also measured the flow through the main channel of the venturi to be\u00a0\u00a0\u00a0 10 <em>L\/min<\/em>.<\/p>\n<figure id=\"attachment_387\" aria-describedby=\"caption-attachment-387\" style=\"width: 169px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-387 size-medium\" src=\"http:\/\/fenneclabs.net\/wordpress\/wp-content\/uploads\/2019\/01\/IMG_20190122_003740-169x300.jpg\" alt=\"\" width=\"169\" height=\"300\" srcset=\"https:\/\/fenneclabs.net\/wordpress\/wp-content\/uploads\/2019\/01\/IMG_20190122_003740-169x300.jpg 169w, https:\/\/fenneclabs.net\/wordpress\/wp-content\/uploads\/2019\/01\/IMG_20190122_003740-768x1365.jpg 768w, https:\/\/fenneclabs.net\/wordpress\/wp-content\/uploads\/2019\/01\/IMG_20190122_003740-576x1024.jpg 576w, https:\/\/fenneclabs.net\/wordpress\/wp-content\/uploads\/2019\/01\/IMG_20190122_003740.jpg 1836w\" sizes=\"auto, (max-width: 169px) 100vw, 169px\" \/><figcaption id=\"caption-attachment-387\" class=\"wp-caption-text\">Suction flow rate<\/figcaption><\/figure>\n<p>I proceeded with measuring the static vacuum pressure by immersing a hose from the suction port and into a water cup and measuring the water rise to be 9 <em>cm<\/em>, which correlates to 0.01 <em>Bar.<\/em><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-390 size-medium\" src=\"http:\/\/fenneclabs.net\/wordpress\/wp-content\/uploads\/2019\/01\/IMG_20190122_011823-169x300.jpg\" alt=\"\" width=\"169\" height=\"300\" srcset=\"https:\/\/fenneclabs.net\/wordpress\/wp-content\/uploads\/2019\/01\/IMG_20190122_011823-169x300.jpg 169w, https:\/\/fenneclabs.net\/wordpress\/wp-content\/uploads\/2019\/01\/IMG_20190122_011823-768x1365.jpg 768w, https:\/\/fenneclabs.net\/wordpress\/wp-content\/uploads\/2019\/01\/IMG_20190122_011823-576x1024.jpg 576w, https:\/\/fenneclabs.net\/wordpress\/wp-content\/uploads\/2019\/01\/IMG_20190122_011823.jpg 1836w\" sizes=\"auto, (max-width: 169px) 100vw, 169px\" \/><\/p>\n<p>Playing with the Venturi pump, I also made a gif showing a candle flame being sucked into a glass tube:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-391\" src=\"http:\/\/fenneclabs.net\/wordpress\/wp-content\/uploads\/2019\/01\/PassionateEagerHackee-small.gif\" alt=\"\" width=\"250\" height=\"141\" \/><\/p>\n<p>In conclusion, I can now safely exhaust any nasty chemical out without damaging the exhaust! In case anyone else is interested in making their own Venturi for whatever use, I am sharing my <a href=\"https:\/\/grabcad.com\/library\/air-powered-venturi-pump-3d-printing-friendly-1\">model<\/a> in GrabCAD.<\/p>\n<p>I am by no mean a specialist in fluid dynamics, and I am sure that my design is far from optimal, and I hope that this blog post will inspire someone who is more educated on the subject to make a superior design made ready for 3D printing for public use.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>If for some reason you need to pump fine dust dust or a fluid (gas or liquid) without it flowing through the pump itself, Venturi is a great way to go. Two good examples are wood or fiberglass dust collection, as sucking these through the pump would result in gunk accumulating inside the diaphragm\/fan and [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":383,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"image","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[13,1],"tags":[],"class_list":["post-377","post","type-post","status-publish","format-image","has-post-thumbnail","hentry","category-3d-printing","category-uncategorized","post_format-post-format-image"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>3D printed Venturi pump - FennecLabs<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/fenneclabs.net\/index.php\/2019\/01\/22\/3d-printed-venturi-pump\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"3D printed Venturi pump - FennecLabs\" \/>\n<meta property=\"og:description\" content=\"If for some reason you need to pump fine dust dust or a fluid (gas or liquid) without it flowing through the pump itself, Venturi is a great way to go. 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