Fluid Mechanics of Longitudinal Contractions in the Small Intestine

1979 ◽  
Vol 101 (4) ◽  
pp. 284-288 ◽  
Author(s):  
J. G. Melville ◽  
N. Denli
Keyword(s):  
Reynolds Number ◽  
Small Intestine ◽  
Motor Activity ◽  
Fluid Mechanics ◽  
Low Reynolds Number ◽  
Retrograde Flow ◽  
Particle Trajectories ◽  
Low Reynolds

Longitudinal contractions in the duodenum are shown to exit experimentally. A low Reynolds number model of flows induced by propagating longitudinal contractions is presented for circular conduits. Particle trajectories and time lines are shown to elucidate the flowfields. Longitudinal motor activity is shown to have the capability of satisfying the mixing function of the small intestine and to be a possible contributor of retrograde flow.

Numerical shape optimization in Fluid Mechanics at low Reynolds number

2019 ◽  
Author(s):  
Alexis Courtais ◽  
Francois Lesage ◽  
Yannick Privat ◽  
Pascal Frey ◽  
Abderrazak M. Latifi
Keyword(s):  
Reynolds Number ◽  
Fluid Mechanics ◽  
Shape Optimization ◽  
Low Reynolds Number ◽  
Low Reynolds

A Theoretical Model for the Transverse Impingement of Free Jets at Low Reynolds Numbers

1980 ◽  
Vol 102 (4) ◽  
pp. 510-518 ◽  
Author(s):  
R. Winton ◽  
H. R. Martin
Keyword(s):  
Reynolds Number ◽  
Theoretical Model ◽  
Fluid Mechanics ◽  
Low Reynolds Number ◽  
Reynolds Numbers ◽  
Exit Plane ◽  
Suction Force ◽  
Free Jets ◽  
Low Reynolds Numbers ◽  
Low Reynolds

There are many applications in industrial fluid mechanics and fluidic technology where jets of fluid interact. This paper examines the interaction of two liquid laminar free jets under low Reynolds number conditions and particularly highlights the phenomenon of the inwards deflecting jet. A potential flow solution is developed for the modelling of the control jet flow in the vicinity of the control nozzle exit plane, which demonstrates the presence of a net suction force modifying the momentum interaction of the two orthogonal jets under these low Reynolds number conditions.

scholarly journals Measurement of particle accelerations in fully developed turbulence

2002 ◽  
Vol 469 ◽  
pp. 121-160 ◽  
Author(s):  
GREG A. VOTH ◽  
A. LA PORTA ◽  
ALICE M. CRAWFORD ◽  
JIM ALEXANDER ◽  
EBERHARD BODENSCHATZ
Keyword(s):  
Reynolds Number ◽  
Particle Physics ◽  
Large Scale ◽  
Low Reynolds Number ◽  
High Energy ◽  
Frame Rate ◽  
High Energy Particle ◽  
Particle Trajectories ◽  
Low Reynolds ◽  
Acceleration Component

We use silicon strip detectors (originally developed for the CLEO III high-energy particle physics experiment) to measure fluid particle trajectories in turbulence with temporal resolution of up to 70000 frames per second. This high frame rate allows the Kolmogorov time scale of a turbulent water flow to be fully resolved for 140 [ges ] Rλ [ges ] 970. Particle trajectories exhibiting accelerations up to 16000 m s −2 (40 times the r.m.s. value) are routinely observed. The probability density function of the acceleration is found to have Reynolds-number-dependent stretched exponential tails. The moments of the acceleration distribution are calculated. The scaling of the acceleration component variance with the energy dissipation is found to be consistent with the results for low-Reynolds-number direct numerical simulations, and with the K41-based Heisenberg–Yaglom prediction for Rλ [ges ] 500. The acceleration flatness is found to increase with Reynolds number, and to exceed 60 at Rλ = 970. The coupling of the acceleration to the large-scale anisotropy is found to be large at low Reynolds number and to decrease as the Reynolds number increases, but to persist at all Reynolds numbers measured. The dependence of the acceleration variance on the size and density of the tracer particles is measured. The autocorrelation function of an acceleration component is measured, and is found to scale with the Kolmogorov time τη.

Experimental Investigation on Blunt-Edged UTM Delta Wing VFE-2 Configurations at Low Reynolds Number

2018 ◽  
Vol 12 (3) ◽  
pp. 255
Author(s):  
Muhammad Zal Aminullah Daman Huri ◽  
Shabudin Bin Mat ◽  
Mazuriah Said ◽  
Shuhaimi Mansor ◽  
Md. Nizam Dahalan ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Reynolds Number ◽  
Delta Wing ◽  
Low Reynolds Number ◽  
Low Reynolds
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