Experimental investigation of helical structures in swirling flows

Grundmann, Sven; Wassermann, Florian; Lorenz, Ramona; Jung, Bernd; Tropea, Cameron

doi:10.1016/j.ijheatfluidflow.2012.05.003

Cited by 37 publications

(7 citation statements)

References 21 publications

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“…The experiments were conducted using the flow supply system described in detail in Grundmann et al (2012). It provides a flow rate of up to 70 L/min using a 0.55 kW rotary-pump (Grundfos, CME3-2).…”

Section: Flow Apparatus and Mr Scannermentioning

confidence: 99%

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Volumetric intake flow measurements of an IC engine using magnetic resonance velocimetry

et al. 2014

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Magnetic resonance velocimetry (MRV) measurements are performed in a 1:1 scale model of a singlecylinder optical engine to investigate the volumetric flow within the intake and cylinder geometry during flow induction. The model is a steady flow water analogue of the optical IC-engine with a fixed valve lift of 9:21 mm to simulate the induction flow at crank-angle 270 bTDC. This setup resembles a steady flow engine test bench configuration. MRV measurements are validated with phaseaveraged particle image velocimetry (PIV) measurements performed within the symmetry plane of the optical engine. Differences in experimental operating parameters between MRV and PIV measurements are well addressed. Comparison of MRV and PIV measurements is demonstrated using normalized mean velocity component profiles and showed excellent agreement in the upper portion of the cylinder chamber (i.e., y ! À 20 mm). MRV measurements are further used to analyze the ensemble average volumetric flow within the 3D engine domain. Measurements are used to describe the 3D overflow and underflow behavior as the annular flow enters the cylinder chamber. Flow features such as the annular jet-like flows extending into the cylinder, their influence on large-scale in-cylinder flow motion, as well as flow recirculation zones are identified in 3D space. Inlet flow velocities are analyzed around the entire valve curtain perimeter to quantify percent mass flow rate entering the cylinder. Recirculation zones associated with the underflow are shown to reduce local mass flow rates up to 50 %. Recirculation zones are further analyzed in 3D space within the intake manifold and cylinder chamber. It is suggested that such recirculation zones can have large implications on cylinder charge filling and variations of the in-cylinder flow pattern. MRV is revealed to be an important diagnostic tool used to understand the volumetric induction flow within engine geometries and is potentially suited to evaluate flow changes due to intake geometry modifications.

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Section: Flow Apparatus and Mr Scannermentioning

confidence: 99%

“…Fig.1Schematic illustration of the experimental setup with flow supply system and MR scanner according toGrundmann et al (2012) …”

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confidence: 99%

Volumetric intake flow measurements of an IC engine using magnetic resonance velocimetry

et al. 2014

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“…The recovered signal could provide insight into proton density, magnetic relaxation times or velocities within the sample (Bernstein et al 2004). There is precedent for the use of magnetic resonance velocimetry in turbulent mixing (Benson et al 2009), swirling (Grundmann et al 2012), structured (Wassermann et al 2014), and even cytoplasmic flows (Van De Meent et al 2010). This work is a first look at testing the feasibility as well as understanding the challenges associated with magnetic resonance based methods where high intensity electric fields are present in the scanner.…”

Section: Introductionmentioning

confidence: 99%

Magnetic resonance imaging of flow and mass transfer in electrohydrodynamic liquid bridges

Wexler¹,

Drusová²,

Fuchs³

et al. 2016

J Vis

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Here we report on the feasibility and use of magnetic resonance imaging based methods to the study of electrohydrodynamic (EHD) liquid bridges. High speed tomographic recordings through the longitudinal axis of water bridges were used to characterize the mass transfer dynamics, mixing, and flow structure.By filling one beaker with heavy water and the other with light water it was possible to track the spread of the proton signal throughout the total liquid volume. The mixing kinetics are different depending on where the light nuclei are located and proceeds faster when the anolyte is light water. Distinct flow and mixing regions are identified in the fluid volumes and it is shown that the EHD flow at the electrodes can be counteracted by the density difference between water isotopes. MR phase contrast imaging reveals that within the bridge section two separate counter propagating flows pass one above the other in the bridge.

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“…MRI also represents an opportunity to measure both velocity and temperature. For some time MRI four‐dimensional flow sequences have been used in vivo to measure blood flow in the cardiovascular system and also to investigate velocity fields in a variety of complex fluid flows . By applying both MRT and four‐dimensional flow sequences, there is potential to study heat transfer processes in fluid flows in great detail with a single measurement technique and a single flow setup.…”

Section: Introductionmentioning

confidence: 99%

Acquisition of 3D temperature distributions in fluid flow using proton resonance frequency thermometry

Buchenberg

Wassermann

Grundmann

et al. 2015

Magnetic Resonance in Med

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Experimental investigation of helical structures in swirling flows

Cited by 37 publications

References 21 publications

Volumetric intake flow measurements of an IC engine using magnetic resonance velocimetry

Volumetric intake flow measurements of an IC engine using magnetic resonance velocimetry

Magnetic resonance imaging of flow and mass transfer in electrohydrodynamic liquid bridges

Acquisition of 3D temperature distributions in fluid flow using proton resonance frequency thermometry

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