Pressure field estimation from ultrasound Doppler velocity profiler for vortex-shedding flows

Tiwari, Neetu; Tasaka, Yuji; Murai, Yuichi

doi:10.1016/j.flowmeasinst.2019.03.009

Cited by 7 publications

(7 citation statements)

References 28 publications

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“…If proper attention in not rendered, these noises can magnify in calculation of second component of velocity and subsequently in viscosity and pressure. Combination of temporal (FFT, fast Fourier transform) and spatial (POD, proper orthogonal decomposition) filtering in UVP data had proved very efficient for noise reduction with conserving coherent flow structures as explained in our previous work (Tiwari et al 2019). So, here we adopted the same filtering technique.…”

Section: Velocity Data Filteringmentioning

confidence: 98%

“…c for non-Newtonian flow (Tiwari et al, 2021). d UVP for Newtonian flow (Tiwari et al 2019). e UVP for non-Newtonian flow which is the present topic…”

Section: Test Fluid and Experimental Conditionsmentioning

confidence: 99%

“…The 2D velocity is reconstructed by substituting the filtered v component of velocity in equation of continuity as Zero velocity is given in upper and lower boundaries, and the integration in multiple directions is applied to minimize the cumulative residual. The method is the same as our previous paper (Tiwari et al 2019). The reconstructed 2D velocity vector field is shown in Fig.…”

Section: Reconstruction Of 2d Velocity Fieldmentioning

confidence: 99%

“…Table 1 classifies previous studies applied to cylinder wake flows. The studies described in Table 1 are purely experimental or numerical, except our previous paper (Tiwari et al 2021) and (Tiwari et al 2019). Tiwari et al 2021 discussed PIVbased pressure and viscosity investigation in pseudoplastic flow for steady flows and focused on enlightening the change of vortex dynamics due to shear-thinning property of fluid.…”

Section: Introductionmentioning

confidence: 99%

“…A linear error propagation analysis was also discussed to compare the characteristics of error in a shearthinning fluid and a Newtonian fluid. In our previous work (Tiwari et al 2019), UVP was applied to study flow over cylinder in opaque Newtonian fluid at Re = 1000. We have developed a pressure estimation algorithm based on UVP measurements targeting vortex streets formed behind a cylinder.…”

Section: Introductionmentioning

confidence: 99%

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Ultrasonic velocity profiler applied to explore viscosity–pressure fields and their coupling in inelastic shear-thinning vortex streets

Tiwari

Murai

2021

Exp Fluids

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A method for simultaneous estimation of viscosity and pressure fields in inelastic shear-thinning fluids is developed by means of ultrasound velocity profiling technique (UVP). In the method, equation of continuity, rheological model and pressure Poisson equation are incorporated as data processing sequences for measured velocity distributions. The proposed method is applied to study the vortex street structure formed behind a circular cylinder, which shows viscosity–pressure coupling due to shear-thinning property of fluid. For demonstration, aqueous solution of CMC (carboxy methyl cellulose) of weight concentration of 0.1% is chosen as the working fluid with shear-thinning property. An alternating staggered pattern of low-pressure spots is successfully reconstructed for zero-shear-based Reynolds number, Re = 50–300. We have found that increasing Re resulted in decrease in vortex shedding Strouhal number because of vortex sustainability supported by shear-thinning property. Graphical abstract

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Section: Velocity Data Filteringmentioning

confidence: 98%

“…c for non-Newtonian flow (Tiwari et al, 2021). d UVP for Newtonian flow (Tiwari et al 2019). e UVP for non-Newtonian flow which is the present topic…”

Section: Test Fluid and Experimental Conditionsmentioning

confidence: 99%

Section: Reconstruction Of 2d Velocity Fieldmentioning

confidence: 99%