A schematic of a stefan tube. Note that it is not necessary for there to be a cross-wise horizontal tube at the top. On the right, a mathematically equivalent simpler model.
In chemical engineering, a Stefan tube is a device that was devised by Josef Stefan in 1874.[1] It is often used for measuring diffusion coefficients.[1][2] It comprises a vertical tube, over the top of which a gas flows and at the bottom of which is a pool of volatile liquid that is maintained in a constant-temperature bath.[1][3][4] The liquid in the pool evaporates, diffuses through the gas above it in the tube, and is carried away by the gas flow over the tube mouth at the top.[1][3] One then measures the fall in the level of the liquid in the tube.[4]
The tube conventionally has a narrow diameter, in order to suppress convection.[4]
The way that a Stefan tube is modelled, mathematically, is very similar to how one can model the diffusion of perfume fragrance molecules from (say) a drop of perfume on skin or clothes, evaporating up through the air to a person's nose. There are some differences between the models. However, they turn out to have little effect on results at highly dilute vapour concentrations.[5]
Stefantube is a device that was devised by Josef Stefan in 1874. It is often used for measuring diffusion coefficients. It comprises a vertical tube...
σ Stefan adhesion Stefan problem Stefan's equation Stefan's formula Stefan flow Stefan number Stefantube Maxwell–Stefan diffusion The Jožef Stefan Institute...
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Think YouTube channel. Her first video published on the channel was a lecture named 'Do humans have souls?'. Hossenfelder married physicist Stefan Scherer [d]...
August 28, 2013. AveAndDill (July 24, 2011). "Stefan Janoski - Expedition One: Alone" (Video upload). YouTube. Google, Inc. Archived from the original on...
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LazyTown (1999)". YouTube. 3 February 2017. Retrieved 6 September 2018.[dead YouTube link] Fennimore, Jack (2018-08-21). "Stefan Karl Stefansson Dead:...
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YouTube channel in 2015, that the song "We Are Number One" became an Internet meme. Shortly afterwards, on October 13, Robbie Rotten's performer Stefán Karl...
for their YouTube cover-parody of the 2009 single "TiK ToK" by American pop artist Ke$ha. The group currently has three members: Stefan Abingdon, Dru...
Stefan Witas at IMDb Jak sen (Like A Dream) on YouTube text by Andrzej Włast, music by Adam Lewandowski singing famous Polish tango Rebeca on YouTube...
strain of the material of the tube is magnified by forming the tube into a C shape or even a helix, such that the entire tube tends to straighten out or...
injection of contrast), with a fine needle, has been performed. A nephrostomy tube may then be placed to allow drainage. An urostomy is a related procedure...
EHF Cup: 2007 Sportvereinigung (SV) Dynamo "Stefan Kretzschmar im exklusiven Interview | Buschi.TV - YouTube". Archived from the original on 21 December...
YouTube. The Mirror reported that Postma had "originally managed to keep the video secret by buying it when his ex tried to sell it on eBay." "Stefan Postma"...
Stefan Milenkovich (Serbian: Stefan Milenković, Стефан Миленковић; born January 25, 1977) is a Serbian violinist. Milenković was born to a Serbian father...
27, 2015. Bezanson, Jeff; Karpinski, Stefan. "Julia and Python: a dynamic duo for scientific computing". YouTube. Retrieved June 27, 2015. "Julia: to...
Stefan Simchowitz (born October 8, 1970) is a Los Angeles-based art collector, art curator, and art advisor. He is a vocal proponent of social media as...
July 2018. "Hajdin Stefan 2015 - Agent Scouting Video". YouTube. 20 July 2015. Retrieved 8 January 2018. "Hajdin, Stefan". YouTube. 29 June 2011. Retrieved...
known as KIRAC) is a web series on YouTube and Vimeo exploring the international art world. Directed by Stefan Ruitenbeek, a Dutch artist and director...
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