Atle Jensen

• Marchenko, Aleksey; Haase, Andrea; Jensen, Atle; Lishman, Ben; Rabault, Jean; Evers, Karl-Ulrich; Shortt, Mark & Thiel, Torsten (2020). Elasticity and viscosity of ice measured in the experiment on wave propagation below the ice in HSVA ice tank. Proceedings of the IAHR International Symposium on ice.  ISSN 2414-6331.
• Marchenko, Aleksey; Zenkin, Alex; Marchenko, Nataliya; Paynter, Chris; Whitchelo, Yiyi; Ellevold, Thea Josefine & Jensen, Atle (2020). Monitoring of 3D motion of drifting iceberg with an ice tracker equipped with accelerometers. Proceedings of the IAHR International Symposium on ice.  ISSN 2414-6331.
• Rabault, Jean; Sutherland, Graig; Gundersen, Olav; Jensen, Atle; Marchenko, Aleksey & Breivik, Øyvind (2020). An open source, versatile, affordable waves in ice instrument for scientific measurements in the Polar Regions. Cold Regions Science and Technology.  ISSN 0165-232X.  170 . doi: 10.1016/j.coldregions.2019.102955
• Ramirez De La Torre, Reyna Guadalupe; Jensen, Atle & Kuchta, Miroslav (2020). Experiments on air entrainment produced by a circular free falling jet. International Journal of Multiphase Flow.  ISSN 0301-9322. . doi: https://doi.org/10.1016/j.ijmultiphaseflow.2020.103424 Fulltekst i vitenarkiv. Vis sammendrag

  The process of a circular free falling jet entering an idle pool was studied with the objective of determining a relation between the naturally occurring disturbances on the jet surface and air entrainment. To this end the instabilities of the free falling jet were characterized and compared with the bubble count distribution and an estimated amount of entrained air in the plume. Different jet lengths were considered. The aeration process was captured through image sequences. Individ- ual analysis of each disturbance in the jet surface was made. Our results show that both the bubble count and entrained air have a linear relation with the steepness of the jet disturbances. Moreover, the wave-jet ratio is introduced, which defines an entrainment condition for all the studied cases.

• Vollestad, Petter; Angheluta, Luiza & Jensen, Atle (2020). Experimental study of secondary flows above rough and flat interfaces in horizontal gas-liquid pipe flow. International Journal of Multiphase Flow.  ISSN 0301-9322. . doi: https://doi.org/10.1016/j.ijmultiphaseflow.2020.103235
• Carr, Magda; Sutherland, Peter; Haase, Andrea; Evers, Karl-Ulrich; Fer, Ilker; Jensen, Atle; Kalisch, Henrik; Berntsen, Jarle; Părău, Emilian I.; Thiem, Øyvind & Davies, Peter A. (2019). Laboratory experiments on internal solitary waves in ice-covered waters. Geophysical Research Letters.  ISSN 0094-8276.  46(21), s 12230- 12238 . doi: 10.1029/2019GL084710 Fulltekst i vitenarkiv.
• Mossige, Endre Joachim; Edvardsen, Bente; Jensen, Atle & Mielnik, Michal Marek (2019). A tunable, microfluidic filter for clog‑free concentration and separation of complex algal cells. Microfluidics and Nanofluidics.  ISSN 1613-4982.  23(56) . doi: 10.1007/s10404-019-2209-y Fulltekst i vitenarkiv. Vis sammendrag

  An inherent problem with microfluidic filters is the tendency to clog, especially when applied to cells due to their geometrical complexity, deformability, and tendency to adhere to surfaces. In this work, we handle live algal cells of high complexity without signs of clogging, achieved by exploiting hydrodynamic interactions around trilobite-shaped filtration units. To characterize the influence of cell complexity on the separation and concentration mechanisms, we compare the hydrodynamic interactions to those of synthetic, rigid microparticles. We discover that simple rolling along the filter structures, which prevents clogging for particles, cannot be applied to cells. Instead, we find that inertial effects must be employed to minimize the filter interactions and that this modification leads to only a minor reduction in device performance.

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• Breivik, Øyvind; Rabault, Jean; Hole, Lars R; Christensen, Kai Håkon; Müller, Malte; Jensen, Atle & Mauritzen, Cecilie (2019). Bølger i isen påvirker Arktis. Å forstå isdønningene kan forbedre værvarsler og klimamodeller.. Forskning.no.  ISSN 1891-635X.
• Løken, Trygve Kvåle; Rabault, Jean; Jensen, Atle; Christensen, Kai Håkon & Müller, Malte (2019). Wave statistics from ship mounted sensors in the marginal ice zone.
• Marchenko, Aleksey; Haase, Andrea; Jensen, Atle; Lishman, Ben & Rabault, Jean (2019). Laboratory investigations of the bending rheology of floating saline ice and wave damping in the HSVA ice tank.

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