Diffusion measurements using the shear cell technique: Investigation of the role of Marangoni convection by pre-flight experiments on the ground and during the Foton M2 mission

✍ Scribed by Raluca Roşu-Pflumm; Wolfgang Wendl; German Müller-Vogt; Shinsuke Suzuki; K.-H. Kraatz; G. Frohberg

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 523 KB
• Volume: 52
• Category: Article
• ISSN: 0017-9310
• DOI: 10.1016/j.ijheatmasstransfer.2009.06.001

✦ Synopsis

An experimental investigation on the disturbing influence of the solutal Marangoni convection during diffusion measurements is presented. We used the systems Sn-Bi, Pb-Ag and Sn-In with decreasing differences in surface tension. For all systems we measured surface tension and -under varying free surface conditions -diffusion coefficients. We succeeded in measuring diffusion coefficients on the ground under nearly non-free surface conditions. The results are compared with the results of the FOTON M2-satellite mission with similar lg-experiments. We show that temperatures from around 400 °C to about 800 °C and the degree of free surfaces influences strongly the measured value for the diffusion coefficient.