Searched for: author%3A%22Jahangir%2C+S.%22
(1 - 10 of 10)
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Jahangir, S. (author), Ghahramani, Ebrahim (author), Neuhauser, Magdalena (author), Bourgeois, Sébastien (author), Bensow, Rickard E. (author), Poelma, C. (author)
The objective of this study is to investigate the collapsing behavior of cavitation, which leads to the erosion of material. An experimental examination was conducted in a channel with a semi-circular cylinder obstacle, which serves as a “vortex cavity” generator. Cavitation was achieved by employing a range of pressure differences over the...
journal article 2021
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Jahangir, S. (author)
Cavitation is a well-known phenomenon, occurring in a wide range of applications. In most applications, cavitation is undesirable, such as turbines, pumps, ship propellers and diesel injector nozzles. Cavitation can cause material erosion, flow blockage, noise and degradation of equipment over time. The ability to predict the behavior of this...
doctoral thesis 2020
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John, Kristine (author), Jahangir, S. (author), Gawandalkar, U.U. (author), Hogendoorn, W.J. (author), Poelma, C. (author), Grundmann, Sven (author), Bruschewski, Martin (author)
This study focuses on the measurement accuracy of Magnetic Resonance Velocimetry (MRV) in high-speed turbulent flows. One of the most prominent errors in MRV is the displacement error, which describes the misregistration of spatial coordinates and velocity components in moving fluids. Displacement errors are particularly critical for experiments...
journal article 2020
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Ghahramani, Ebrahim (author), Jahangir, S. (author), Neuhauser, Magdalena (author), Bourgeois, Sébastien (author), Poelma, C. (author), Bensow, Rickard E. (author)
In this paper, the cavitating flow around a bluff body is studied both experimentally and numerically. The bluff body has a finite length with semi-circular cross section and is mounted on a surface in the throat of a converging-diverging channel. This set-up creates various 3D flow structures around the body, from cavitation inception to...
journal article 2020
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Brunhart, Maxwell (author), Soteriou, Celia (author), Gavaises, Manolis (author), Karathanassis, Ioannis (author), Koukouvinis, Phoevos (author), Jahangir, S. (author), Poelma, C. (author)
Cavitating flow dynamics are investigated in an axisymmetric converging–diverging Venturi nozzle. Computational Fluid Dynamics (CFD) results are compared with those from previous experiments. New analysis performed on the quantitative results from both datasets reveals a coherent trend and shows that the simulations and experiments agree well....
journal article 2020
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Jahangir, S. (author), Ghahramani, Ebrahim (author), Neuhauser, Magdalena (author), Bourgeois, Sébastien (author), Bensow, Rickard E. (author), Poelma, C. (author)
The objective of this study is to investigate the collapsing behavior of cavitation, which leads to erosion. For this purpose, an experimental investigation was performed in a channel with a semi-circular cylinder obstacle at the Hydraulic Laboratory of ANDRITZ HYDRO in Vevey. Cavitation was achieved by employing a range of pressure differences...
conference paper 2019
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Jahangir, S. (author), Wagner, E.C. (author), Mudde, R.F. (author), Poelma, C. (author)
Cavitation is a complicated multiphase phenomenon, where the production of vapor cavities leads to an opaque flow. Exploring the internal structures of the cavitating flows is one of the most significant challenges in this field of study. While it is not possible to visualize the interior of the cavity with visible light, we use X-ray...
journal article 2019
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Jahangir, S. (author), Hogendoorn, W.J. (author), Poelma, C. (author)
Partial cavitation dynamics in an axisymmetric converging-diverging nozzle are investigated experimentally. Shadowgraphy is used to visualize and analyze different cavitation regimes. These regimes are generated by changing the global static pressure and flow velocity independently. Cloud cavitation is the most interesting and complex regime,...
journal article 2018
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Dash, A. (author), Jahangir, S. (author), Poelma, C. (author)
A quantitative analysis of two imaging modalities, shadowgraphy and x-ray imaging, is presented in the framework of void fraction determination. The need for this arises from the fact that shadowgraphs are sometimes utilized to quantify void fraction profiles, which is an unproven method. Time-averaged x-ray images are used to evaluate the...
journal article 2018
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Jahangir, S. (author), Wagner, E.C. (author), Mudde, R.F. (author), Poelma, C. (author)
Cavitation is a complex multiphase phenomenon, where the production of vapor bubbles leads to opaqueness of the flow. While it is nearly impossible to visualize the interior of the cavitation region with visible light, we show that with X-ray computed tomography it is possible to obtain the time-averaged void fraction distribution in an...
conference paper 2018
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