Zobrazeno 1 - 10
of 503
pro vyhledávání: '"Frigaard, P"'
Wormlike micellar solutions formed by long-chained zwitterionic surfactants show gel-like rheology at room temperature and have recently been found to exhibit other complex and interesting rheological features. We study the dynamics of these wormlike
Externí odkaz:
http://arxiv.org/abs/2401.12102
The passage of single air bubbles through the horizontal interface between miscible viscoplastic and Newtonian fluids, considering various combinations of densities and viscosities for the fluid layers, is studied computationally. The primary focus i
Externí odkaz:
http://arxiv.org/abs/2310.17791
Squeeze cementing is a process used to repair leaking oil and gas wells, in which a cement slurry is driven under pressure to fill an uneven leakage channel. This results in a Hele-Shaw type flow problem involving a yield stress fluid. We solve the f
Externí odkaz:
http://arxiv.org/abs/2303.11043
Insects as pollinators play a crucial role in ecosystem management and world food production. However, insect populations are declining, calling for efficient methods of insect monitoring. Existing methods analyze video or time-lapse images of insect
Externí odkaz:
http://arxiv.org/abs/2212.00423
We present an experimental investigation of turbulent drag reduction with flexible and rigid polymer solutions. The flexible polymer is partially hydrolyzed polyacrylamide (HPAM) and the rigid polymer is xanthan gum (XG). The experiments are carried
Externí odkaz:
http://arxiv.org/abs/2210.10319
Publikováno v:
J. Non. Newt. Fluid Mech. 293 (2021) 104570
Turbulent flows of viscoplastic fluids at high Reynolds numbers have been investigated recently with direct numerical simulations (DNS) but experimental results have been limited. For this reason, we carry out an experimental study of fully turbulent
Externí odkaz:
http://arxiv.org/abs/2207.08404
Autor:
Henrik Schirmer, Torbjørn Wisløff, Pål Gulbrandsen, Julia Menichetti, Christine Frigaard, Herman Bjørnstad, Tone Breines Simonsen, Jennifer Gerwing
Publikováno v:
BMJ Open, Vol 14, Iss 8 (2024)
Objectives The main objective of this study was twofold: to investigate what kind of information patients with heart failure (HF) tell their doctors about their medication adherence at home, and how often such information is provided in consultations
Externí odkaz:
https://doaj.org/article/79c1de8a496145d4b8d59d81c1296395
Autor:
Omid Hajieghrary, Ian Frigaard
Publikováno v:
Energies, Vol 17, Iss 19, p 4943 (2024)
Oil sands tailings ponds are significant emitters of greenhouse gases (GHGs) in Canada. To move beyond making surface or atmospheric measurements of GHG release, it is necessary to understand the physical mechanisms by which gas is generated, bubbles
Externí odkaz:
https://doaj.org/article/be6cd6db73f441749f189b42eb62daa1
Long-chained, viscoelastic surfactant solutions (VES) have been widely employed in the oil and gas industry, particularly in hydraulic fracturing and gravel-packing operations, where turbulence is commonly reached due to high pumping rates. With this
Externí odkaz:
http://arxiv.org/abs/2110.07086
We use computational methods to determine the minimal yield-stress required in order to hold static a buoyant bubble in a yield-stress liquid. The static limit is governed by the bubble shape, the dimensionless surface tension ($\gamma$) and the rati
Externí odkaz:
http://arxiv.org/abs/2107.07580